1996 Nov 21

Philips Semiconductors

Product specification

Pulse and DTMF diallers with redial

PCD3310; PCD3310A

CONTENTS

FEATURES

GENERAL DESCRIPTION

QUICK REFERENCE DATA

ORDERING INFORMATION

BLOCK DIAGRAM

PINNING

FUNCTIONAL DESCRIPTION

7.1

Power supply (V

and V

)

7.2

Clock oscillator (OSCI and OSCO)

7.3

Chip enable (CE)

7.4

Mode selection (PD/DTMF)

7.4.1

Pulse mode

7.4.2

DTMF mode

7.4.3

Mixed mode

7.5

Keyboard inputs/outputs

7.6

Flash duration control (FLD)

7.7

TONE output (DTMF mode)

7.8

Dial pulse and Flash output (DP/FLO)

7.9

Mute output (M1)

7.10

Mute output (M1)

7.11

Muting output (M2)

DIALLING PROCEDURES

8.1

Dialling

8.2

Redialling

8.3

Notepad

HANDLING

LIMITING VALUES

CHARACTERISTICS

TIMING CHARACTERISTICS

APPLICATION INFORMATION

PACKAGE OUTLINES

SOLDERING

15.1

Introduction

15.2

DIP

15.2.1

Soldering by dipping or by wave

15.2.2

Repairing soldered joints

15.3

15.3.1

Reflow soldering

15.3.2

Wave soldering

15.3.3

Repairing soldered joints

DEFINITIONS

LIFE SUPPORT APPLICATIONS

1996 Nov 21

Philips Semiconductors

Product specification

Pulse and DTMF diallers with redial

PCD3310; PCD3310A

FEATURES

Pulse, DTMF and `mixed mode' dialling

Mixed mode dialling: start with pulse dial, end with
DTMF dial (e.g. for control of DTMF user equipment via
a pulse network)

23-digit memory stores last number dialled, or number
noted during conversation (notepad)

Redial of both PABX and external calls

Supports 16 dial keys: 0 to 9,

, # A, B, C, and D

Supports 4 function keys:

Program (P) used to input notepad numbers

Flash (FL) allows re-dialling without on-hook

Redial (R) recalls and redialls stored number

Change from pulse dial to DTMF dial in

mixed mode (>)

DTMF timing:

for manual dialling, maximum duration burst/pause

intervals are user-determined, but at least minimum
duration burst/pause intervals are ensured

for redial, minimum duration burst/pause intervals are

used

On-chip voltage reference for supply and temperature
independent tone output

On-chip filtering for low output distortion
(CEPT compatible)

On-chip oscillator uses low-cost 3.58 MHz (TV colour
burst) crystal or piezo resonator

Uses standard single-contact or double-contact
(common left open) keyboard

Keyboard entries fully debounced

Flash (register recall) output.

GENERAL DESCRIPTION

The PCD3310 and PCD3310A are single-chip silicon gate
CMOS integrated circuits. They are dual-standard diallers
for pulse or dual tone multi-frequency (DTMF) dialling, with
on-chip oscillators suitable for use with 3.58 MHz crystals.

Input data is derived from any standard matrix keyboard
for dialling in either the pulse or DTMF mode.

Numbers up to 23 digits can be retained in RAM for
dialling/redialling.

QUICK REFERENCE DATA

SYMBOL

PARAMETER

CONDITIONS

MIN.

TYP.

MAX.

UNIT

operating supply voltage

2.5

6.0

stb

standby supply voltage

1.8

6.0

DD(stb)

standby current (on hook)

stb

= 1.8 V

1.4

DD(conv)

operating current in conversation mode

= 3 V

150

DD(pulse)

operating current in pulse dialling mode

= 3 V

200

DD(DTMF)

operating current in DTMF dialling mode

= 3 V

0.6

0.9

HG(RMS)

DTMF output voltage level for HIGH group
(RMS value)

192

LG(RMS)

DTMF output voltage level for LOW group
(RMS value)

150

voltage gain (pre-emphasis) of group

2.1

THD

total harmonic distortion

amb

operating ambient temperature

+70

1996 Nov 21

Philips Semiconductors

Product specification

Pulse and DTMF diallers with redial

PCD3310; PCD3310A

PINNING

SYMBOL

PINS

TYPE

DESCRIPTION

PCD3310P

PCD3310AP

PCD3310T

PCD3310AT

OSCI

oscillator input

PD/DTMF

select pin; pulse or DTMF dialling input

TONE

single or dual tone frequency output

n.c.

not connected

negative supply

n.c.

not connected

n.c.

not connected

FLD

I/O

flash duration control input/output

ROW 5

I/O

scanning row 5 keyboard input/output

ROW 4

I/O

scanning row 4 keyboard input/output

n.c.

not connected

ROW 3

I/O

scanning row 3 keyboard input/output

ROW 2

I/O

scanning row 2 keyboard input/output

ROW 1

I/O

scanning row 1 keyboard input/output

COL 1

sense column 1 keyboard input (with internal pull-up resistor)

COL 2

sense column 2 keyboard input (with internal pull-up resistor)

COL 3

sense column 3 keyboard input (with internal pull-up resistor)

n.c.

not connected

COL 4

sense column 4 keyboard input (with internal pull-up resistor)

CF/DMODE/FS

confidence tone/dialling mode/frequency select outputs

DP/FLO

dialling pulse and flash output

muting output 2

muting output 1 (active LOW)

muting output 1

n.c.

not connected

chip enable input

positive supply voltage

OSCO

oscillator output

1996 Nov 21

Philips Semiconductors

Product specification

Pulse and DTMF diallers with redial

PCD3310; PCD3310A

Fig.2 Pin configuration (DIP20 package).

handbook, halfpage

OSCI

PD/DTMF

TONE

VSS

FLD

ROW 5

ROW 4

ROW 3

ROW 2

ROW 1

OSCO

VDD

CF/DMODE/FS

COL 4

DP/FLO

COL 3

COL 2

COL 1

PCD3310P

PCD3310AP

MGE489

Fig.3 Pin configuration (SO28 package).

handbook, halfpage

OSCI

PD/DTMF

TONE

n.c.

VSS

n.c.

FLD

ROW 5

ROW 4

n.c.

ROW 3

ROW 2

ROW 1

OSCO

VDD

n.c.

DP/FLO

CF/DMODE/FS

COL 4

n.c.

COL 3

COL 2

COL 1

PCD3310T

PCD3310AT

MGE488

FUNCTIONAL DESCRIPTION

References to `the device' apply to both the PCD3310 and
the PCD3310A.

7.1

Power supply (V

and V

)

The positive supply of the device (V

) must meet the

voltage requirements as indicated in Chapter 11.
To avoid undefined states of the device at power-on, an
internal reset circuit clears the control logic and counters.
If V

drops below the minimum standby supply voltage of

1.8 V the power-on reset circuit inhibits redialling after
hook-off. The power-on reset signal has the highest
priority; it blocks and resets the device without delay
regardless of the state of chip enable input (CE).

7.2

Clock oscillator (OSCI and OSCO)

The timebase for the device for both pulse and DTMF
dialling is a crystal controlled on-chip oscillator which is
completed by connecting a 3.58 MHz crystal or ceramic
resonator between the OSCI and OSCO pins.
Recommended resonator type:

3.58 MHz PXE - Murata; CSA 3.58MG310VA.

7.3

Chip enable (CE)

The CE input enables the device and is used to initialize
the device. When CE is LOW it provides the static standby
condition. In this state the clock oscillator is disabled, all
registers and logic are reset with the exception of the redial
registers, Read Address Counter (RAC), Write Address
Counter (WAC) and Temporary Write Address Counter
(TWAC). The RAC points to the first digit of the last
number dialled, the WAC and TWAC point to the last
entered digits in the main and temporary registers
(see Fig.6). The keyboard input is inhibited, but data
previously entered is saved in the redial registers provided
V

is higher than V

stb

. The current drawn is I

stb

(standby

current) and serves to retain data in the redial registers
during hook-on.

When CE is HIGH it activates the clock oscillator and the
device changes from static standby condition to the
conversation mode. The current consumption is I

DD(conv)

until the first digit is entered from the keyboard. Then a
dialling or redialling operation starts. The operating current
is I

DD(pulse)

if in the pulse dialling mode, or I

DD(DTMF)

if the

DTMF dialling mode is selected.

1996 Nov 21

Philips Semiconductors

Product specification

Pulse and DTMF diallers with redial

PCD3310; PCD3310A

If the CE input is taken to a LOW level for longer than time
period t

(see Figs 11 and 12 and Chapter 12) an internal

reset pulse will be generated at the end of the t

period.

The system changes to the static standby state. Short CE
pulses of < t

will not affect the operation of the device and

reset pulses are not produced.

7.4

Mode selection (PD/DTMF)

7.4.1

ULSE MODE

If PD/DTMF = V

the pulse mode is selected. Entries of

non-numeric keys are neglected, they are neither stored in
the redial register nor transmitted.

7.4.2

DTMF

MODE

If PD/DTMF = V

the dual tone multi-frequency dialling

mode is selected. Each non-function key activated
corresponds to a combination of two tones, one of four
LOW and one of four HIGH frequencies, corresponding to
the key's row and column in the keyboard matrix.
See Fig.4 and Table 3. The frequencies are transmitted
with a constant amplitude, regardless of power supply
variations. Harmonic content is filtered out thus meeting
the CEPT recommendations.

The transmission time is calibrated for redial. In manual
operation the duration of bursts and pauses is the actual
key depression time, but not less than the minimum
transmission time (t

) or minimum pause time (t

7.4.3

IXED MODE

When the PD/DTMF pin is open-circuit the mixed mode is
selected. After activation of CE or FL (Flash) the device
starts as a pulse dialler and remains in this state until a
non-numeric dial key (A, B, C, D,

, #) or the function key >

is activated. Pressing a non-numeric dial key causes the
corresponding DTMF tones to be output, and any
subsequent dialling to be in DTMF mode. Pressing >
causes no output tones, but any subsequent dialling is in
DTMF mode. The > key should be used if the first DTMF
output required is numeric. The device remains in DTMF
dial mode until FL is activated or after a static standby
condition when CE is re-activated.

A connection between the PD/DTMF pin and V

also

initiates DTMF dialling. Chip enable, FL or a connection of
PD/DTMF pin to V

sets the device back to pulse dialling.

7.5

Keyboard inputs/outputs

The sense column inputs COL 1 to COL 4 and the
scanning row outputs ROW 1 to ROW 5 of the device are
connected to the keyboard as shown in Fig.4. All keyboard

entries are debounced on both the leading and trailing
edges for approximately time period t

as shown in

Figs 11, 12, 13 and 14. Each entry is tested for validity.
When a key is depressed, keyboard scanning starts and
only returns to the sense mode after release of that key.

ROW 5 of the keyboard contains the following function
keys:

P = memory clear and programming (notepad)

FL = flash or register recall

R = redial

> = change of dial mode from pulse to DTMF in mixed
dialling mode.

In the pulse dialling mode the valid keys are the
10 numeric dial keys (0 to 9). The non-numeric dial keys
(A, B, C, D,

, #) have no effect on the dialling or the redial

storage. Valid function keys are P, R and FL.

In the DTMF mode all dial keys are valid. They are
transmitted as a dual tone combination and at the same
time stored in the redial register. Valid function keys are P,
FL and R.

In the mixed mode all key entries are valid and executed
accordingly.

Fig.4 Keyboard organization.

handbook, halfpage

MGE491

ROWS

COLUMNS

KEYBOARD

1996 Nov 21

Philips Semiconductors

Product specification

Pulse and DTMF diallers with redial

PCD3310; PCD3310A

7.6

Flash duration control (FLD)

Flash (or register recall) is activated by the FL key and can
be used in DTMF and pulse dialling modes.

The FL key has the same effect as placing the telephone
`on-hook' for a calibrated time. Pressing the FL key will
produce a timed line-break of 100 ms (min.) at the DP/FLO
output. During the conversation mode pressing FL also
acts as a chip enable. The flash pulse duration (t

) is

calibrated and can be prolonged with an external resistor
and capacitor connected to the FLD input/output (see
Fig.5). The flash pulse resets the Read Address Counter
(RAC) to the address of the first entered digit of the last
number dialled. Subsequent redial is possible (see Fig.9).
The counter of the reset delay time is held for a period of
t

7.7

TONE output (DTMF mode)

The single and dual tones which are provided at the TONE
output are filtered by an on-chip switched capacitor filter,
followed by an on-chip active RC low-pass filter. Hence,
the total harmonic distortion of the DTMF tones meets the
CEPT recommendations. The tone output has the
following states:

tone OFF; 3-state

tone ON; the associated frequencies are superimposed
on a DC level of

When the DTMF mode is selected output tones are timed
in manual dialling with a minimum duration of bursts and
pauses, and in redial with a calibrated timing. Single tones
may be generated for test purposes (CE = HIGH). Each
row and column has one corresponding frequency.
High group frequencies are generated by connecting the
column to V

and LOW group frequencies are generated

by forcing the row to V

. The single tone frequency will be

transmitted during activation time, but it is neither
calibrated nor stored.

An on-chip reference voltage provides output tone levels
independent of the supply voltage. Table 3 shows the
frequency tolerance of the output tones for DTMF
signalling.

Fig.5 Flash pulse duration setting.

(a) Flash duration control circuit.
(b) Flash pulse timing. t

FLRC

ndbook, full pagewidth

MGE492

tFL

tFLRC

(a)

(b)

FLD

FLO

1996 Nov 21

Philips Semiconductors

Product specification

Pulse and DTMF diallers with redial

PCD3310; PCD3310A

Table 3

Frequency tolerance of the output tones for DTMF signalling; f

xtal

= 3.579545 MHz

ROW/COLUMN

STANDARD

FREQUENCY (Hz)

TONE OUTPUT

FREQUENCY (Hz)

FREQUENCY DEVIATION

ROW 1

697

697.90

+0.13

+0.90

ROW 2

770

770.46

+0.06

+0.46

ROW 3

852

850.45

0.18

1.55

ROW 4

941

943.23

+0.24

+2.23

COL 1

1209

1206.45

0.21

2.55

COL 2

1336

1341.66

+0.42

+5.66

COL 3

1477

1482.21

+0.35

+5.21

COL 4

1633

1638.24

+0.32

+5.25

7.8

Dial pulse and Flash output (DP/FLO)

This is a combined output which provides control signals
for timing in pulse dialling or for a calibrated line break
(flash or register recall) in both dialling modes.

7.9

Mute output (M1)

The MUTE output can be used to disable the microphone
during dialling.

During pulse dialling the mute output becomes active
HIGH for the period of the inter-digit pause, break time and
make time. It remains at this level until the last digit is
pulsed out.

During DTMF dialling the mute output becomes active
HIGH for the period of tone transmission and remains at
this level until the end of hold-over time. It is also active
HIGH during flash and flash hold-over time.

7.10

Mute output (M1)

Inverted output of M1. In the PCD3310P it is only available
as a bonding option of M1.

7.11

Muting output (M2)

Active HIGH output during actual dialling; i.e. during break
or make time in pulse dialling, or during tone ON/OFF in
DTMF dialling. It is an open drain p-channel output.

DIALLING PROCEDURES (see Figs 7, 8 and 9)

8.1

Dialling

After CE has risen to V

the oscillator starts running and

the Read Address Counter (RAC) is set to the first address
of both the main and temporary redial registers, ready to
redial any stored number (see Fig.6). By dialling the first

valid digit, the Temporary Write Address Counter (TWAC)
will be set to the first address of the temporary register,
and the decoded digit will be stored in the temporary
register at that address. The TWAC is then incremented to
the next address. The first 5 valid digits will be decoded
and stored in the temporary register in this way, and have
no effect on the main register and its associated Write
Address Counter (WAC). After the sixth valid digit is
entered, the TWAC indicates an overflow condition.
The data from the temporary register will be copied into the
5 least significant places of the main register and the
TWAC into the WAC. The sixth digit, and all subsequent
digits will be stored in the main register (a total of not more
than 23). If more than 23 digits are entered redial will be
inhibited. If not more than 5 digits are entered only the
temporary register and the associated TWAC are affected.

All entries are debounced on both the leading and trailing
edges for at least time period t

as shown in Figs 11, 12,

13 and 14.

Each entry is tested for validity before being stored in the
redial registers.

For DTMF dialling all dial keys are valid

For pulse dialling only numeric dial keys are valid.

Simultaneous to their acceptance and corresponding to
the selected mode (pulse, DTMF or mixed), the entries are
transmitted as pulse-trains or as DTMF frequencies in
accordance with PTT requirements. Non-numeric dial key
entries are neglected during pulse dialling; they are neither
stored nor transmitted.

1996 Nov 21

Philips Semiconductors

Product specification

Pulse and DTMF diallers with redial

PCD3310; PCD3310A

8.2

Redialling

After CE has risen to V

the oscillator starts running.

The address of the first digit in the redial register is stored
in the RAC, and the device is in the conversation mode.
If `R' is the first keyboard entry the device starts redialling
the contents of the temporary register. If the overflow flag
of the TWAC was set in the previous dialling, the redialling
continues in the main register.

Because access to an external line from a PABX usually
involves dialling an access code and waiting for an access
tone, a `one-press' redial may fail due to insufficient delay
between the access code and the external number.
For this reason, the access code should be redialled. If the
access code (up to 4 digits) matches the first part of the
stored number, then pressing R after the access tone is
obtained will cause the rest of the number to be redialled
(see Fig.7, PABX).

Timing in the DTMF mode is calibrated for both tone bursts
and pauses.

In mixed mode only the first part entered (the pulse dialled
part of the stored number) can be redialled.

During redial keyboard entries (function or non-function)
are not accepted until the device returns to the
conversation mode after completion of redialling. No redial
activity takes place if one of the following events occur:

Power-on reset

Memory clear (`P' without subsequent data entry)

Memory overflow (more than 23 valid data entries).

8.3

Notepad

The redial register can also be used as a notepad. In the
conversation mode a number with up to 23 digits can be
entered and stored for redialling. By activating the program
key (P) the WAC and TWAC pointers are reset. This acts
like a memory clear (redial is inhibited). Afterwards, by
entering and storing any digits, redialling will be possible
after flash or hook-on and hook-off (see Fig.9).

During notepad programming the numbers entered will not
be transmitted nor is the mute active, only the confidence
tone is generated.

handbook, full pagewidth

MGE493

addressed

through pointers

TWAC or RAC

TEMPORARY REGISTER

TEMPORARY WRITE

ADDRESS COUNTER (TWAC)

addressed

through pointers

WAC or RAC

MAIN REGISTER

write address counter (WAC)

read address counter (RAC)

ADDRESS COUNTER

Fig.6 Program memory map.

1996 Nov 21

Philips Semiconductors

Product specification

Pulse and DTMF diallers with redial

PCD3310; PCD3310A

HANDLING

Inputs and outputs are protected against electrostatic discharge in normal handling. However, it is good practice to take
normal precautions appropriate to handling MOS devices (see

"Data Handbook ICO3, Section: General, Handling MOS

devices").

10 LIMITING VALUES

In accordance with the Absolute Maximum Rating System (IEC 134).

11 CHARACTERISTICS
V

= 3 V; V

= 0 V; f

osc

= 3.579545 MHz; T

amb

25 to +70

C; unless otherwise specified.

SYMBOL

PARAMETER

MIN.

MAX.

UNIT

supply voltage

0.8

+8.0

supply current

DC input current

DC output current

all input voltages

0.8

+ 0.8

tot

total power dissipation

300

power dissipation per output

stg

storage temperature range

+150

amb

operating ambient temperature

+70

SYMBOL

PARAMETER

CONDITIONS

MIN.

TYP.

MAX.

UNIT

Supply

operating supply voltage

2.5

6.0

stb

standby supply voltage

1.8

6.0

DD(conv)

operating supply current in conversation
mode

oscillator ON

150

DD(pulse)

operating supply current in pulse dialling
or flash mode

200

DD(DTMF)

operating supply current in DTMF
dialling mode

tone ON

0.6

0.9

one OFF

200

DD(stb)

standby supply current

= 1.8 V

oscillator OFF; note 1

1.4

4.0

Inputs

LOW level input voltage

0.3V

HIGH level input voltage

0.7V

input leakage current pin CE

Keyboard inputs

KON

keyboard ON resistance

KOFF

keyboard OFF resistance

1996 Nov 21

Philips Semiconductors

Product specification

Pulse and DTMF diallers with redial

PCD3310; PCD3310A

Notes

1. Crystal connected between OSCI and OSCO; CE at V

and all other pins open-circuit.

2. <

10 mA

dynamic current to set/reset PD/DTMF pin (mixed mode).

3. Flash inactive; output voltage = V

4. Related to the level of the LOW group frequency component, according to CEPT recommendations.

Outputs

LOW level output sink current pins M1,
M1, DP/FLO, CF and FLD

= V

+ 0.5 V

0.7

LOW level output sink current pin
PD/DTMF

= V

+ 0.5 V;

note 2

HIGH level output source current pins
M1, M1, DP/FLO, CF and M2

= V

0.5 V

0.6

HIGH level output source current pin
PD/DTMF

= V

0.5 V;

note 2

HIGH level output source current pin
FLD

= V

0.5 V;

note 3

Tone output (see Fig.10)

HG(RMS)

DTMF output voltage levels for HIGH
group (RMS value)

= 2.5 to 6 V

158

192

205

LG(RMS)

DTMF output voltage levels for LOW
group (RMS value)

= 2.5 to 6 V

125

150

160

frequency deviation

0.6

+0.6

DC voltage level

0.5V

output impedance

0.1

0.5

voltage gain (pre-emphasis) of group

1.85

2.1

2.35

THD

total harmonic distortion

amb

= 25

C; note 4

SYMBOL

PARAMETER

CONDITIONS

MIN.

TYP.

MAX.

UNIT

Fig.10 Tone output test circuit.

handbook, halfpage

VDD

VSS

PCD3310X

TONE

50 pF

10 k

MGE501

1996 Nov 21

Philips Semiconductors

Product specification

Pulse and DTMF diallers with redial

PCD3310; PCD3310A

12 TIMING CHARACTERISTICS

When any key is activated a square wave (330 Hz) is generated and appears at the CF output to serve as an acoustic
feed-back for the user.

SYMBOL

PARAMETER

MIN.

TYP.

MAX.

UNIT

DTMF dialling

, t

transmission and pause times (manual dialling)

, t

transmission and pause times (redialling)

Pulse dialling (PCD3310)

dialling pulse frequency

9.8

10.4

inter-digit pause

828

840

844

break time

make time

Pulse dialling (PCD3310A)

dialling pulse frequency

9.8

10.4

inter-digit pause

828

840

844

break time

make time

General

flash pulse duration

100

102

flh

flash hold-over time

hold-over time (muting on M1)

clock start-up time

debounce time

reset delay time

160

1996 Nov 21

Philips Semiconductors

Product specification

Pulse and DTMF diallers with redial

PCD3310; PCD3310A

13 APPLICATION INFORMATION

ook, full pagewidth

MGE503

123

to V

BZX79/C12

390

100 pF

130

3.92

R11

130

R12

820

C12

220

110

4.7

(10 V)

100

(10 V)

2.2

470

100 nF

R14

(2)

BST76

3.9

BC547

BZX79/C10

470 k

10 M

C14

2.2

10 V

10 nF

3.6

100

10 pF

1 nF

10 nF

C13

2.2

10 V

redial

capacitor

BAV10

BAS11

10 k

150 nF

TONE

DP/

FLO

ROW 1

COL 4

COL 3

COL 2

ROW 2

ROW 3

ROW 4

ROW 5

COL 1

PD/DTMF

select pin

R13

to V

(4)

(3)

BAS11

a/b

b/a

line

450

2.2 nF

100

BC557

BC547

BF423

to V

bal

TEA1060/61

PCD3310P

(1)

620

SLPE

AGC

DTMF

Fig.15 Application diagram of the full electronic basic telephone set.

(1)

Automatic line compensation obtained by connecting R6 to V

(2)

The value of resistor R14 is determined by the required level at LN and the DTMF gain of the TEA1060 and TEA1061.

(3)

Symmetrical low-impedance inputs for dynamic and magnetic microphones (TEA1060).

(4)

Asymmetrical high-impedance inputs for electret microphones (TEA1061).

1996 Nov 21

Philips Semiconductors

Product specification

Pulse and DTMF diallers with redial

PCD3310; PCD3310A

UNIT

max.

(1)

REFERENCES

OUTLINE

VERSION

EUROPEAN

PROJECTION

ISSUE DATE

IEC

JEDEC

EIAJ

inches

2.65

0.30
0.10

2.45
2.25

0.49
0.36

0.32
0.23

18.1
17.7

7.6
7.4

1.27

10.65
10.00

1.1
1.0

0.9
0.4

8
0

0.25

0.1

DIMENSIONS (inch dimensions are derived from the original mm dimensions)

Note

1. Plastic or metal protrusions of 0.15 mm maximum per side are not included.

1.1
0.4

SOT136-1

91-08-13

95-01-24

detail X

(A )

0.25

075E06

MS-013AE

pin 1 index

0.10

0.012
0.004

0.096
0.089

0.019
0.014

0.013
0.009

0.71
0.69

0.30
0.29

0.050

1.4

0.055

0.42
0.39

0.043
0.039

0.035
0.016

0.01

0.25

0.01

0.004

0.043
0.016

0.01

10 mm

scale

SO28: plastic small outline package; 28 leads; body width 7.5 mm

SOT136-1

1996 Nov 21

Philips Semiconductors

Product specification

Pulse and DTMF diallers with redial

PCD3310; PCD3310A

15 SOLDERING

15.1

Introduction

There is no soldering method that is ideal for all IC
packages. Wave soldering is often preferred when
through-hole and surface mounted components are mixed
on one printed-circuit board. However, wave soldering is
not always suitable for surface mounted ICs, or for
printed-circuits with high population densities. In these
situations reflow soldering is often used.

This text gives a very brief insight to a complex technology.
A more in-depth account of soldering ICs can be found in
our

"IC Package Databook" (order code 9398 652 90011).

15.2

DIP

15.2.1

OLDERING BY DIPPING OR BY WAVE

The maximum permissible temperature of the solder is
260

C; solder at this temperature must not be in contact

with the joint for more than 5 seconds. The total contact
time of successive solder waves must not exceed
5 seconds.

The device may be mounted up to the seating plane, but
the temperature of the plastic body must not exceed the
specified maximum storage temperature (T

stg max

). If the

printed-circuit board has been pre-heated, forced cooling
may be necessary immediately after soldering to keep the
temperature within the permissible limit.

15.2.2

EPAIRING SOLDERED JOINTS

Apply a low voltage soldering iron (less than 24 V) to the
lead(s) of the package, below the seating plane or not
more than 2 mm above it. If the temperature of the
soldering iron bit is less than 300

C it may remain in

contact for up to 10 seconds. If the bit temperature is
between 300 and 400

C, contact may be up to 5 seconds.

15.3

15.3.1

EFLOW SOLDERING

Reflow soldering techniques are suitable for all SO
packages.

Reflow soldering requires solder paste (a suspension of
fine solder particles, flux and binding agent) to be applied
to the printed-circuit board by screen printing, stencilling or
pressure-syringe dispensing before package placement.

Several techniques exist for reflowing; for example,
thermal conduction by heated belt. Dwell times vary
between 50 and 300 seconds depending on heating
method. Typical reflow temperatures range from
215 to 250

Preheating is necessary to dry the paste and evaporate
the binding agent. Preheating duration: 45 minutes at
45

15.3.2

AVE SOLDERING

Wave soldering techniques can be used for all SO
packages if the following conditions are observed:

A double-wave (a turbulent wave with high upward
pressure followed by a smooth laminar wave) soldering
technique should be used.

The longitudinal axis of the package footprint must be
parallel to the solder flow.

The package footprint must incorporate solder thieves at
the downstream end.

During placement and before soldering, the package must
be fixed with a droplet of adhesive. The adhesive can be
applied by screen printing, pin transfer or syringe
dispensing. The package can be soldered after the
adhesive is cured.

Maximum permissible solder temperature is 260

C, and

maximum duration of package immersion in solder is
10 seconds, if cooled to less than 150

C within

6 seconds. Typical dwell time is 4 seconds at 250

A mildly-activated flux will eliminate the need for removal
of corrosive residues in most applications.

15.3.3

EPAIRING SOLDERED JOINTS

Fix the component by first soldering two diagonally-
opposite end leads. Use only a low voltage soldering iron
(less than 24 V) applied to the flat part of the lead. Contact
time must be limited to 10 seconds at up to 300

C. When

using a dedicated tool, all other leads can be soldered in
one operation within 2 to 5 seconds between
270 and 320

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Philips Semiconductors a worldwide company

SCA52

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Printed in The Netherlands

417021/1200/03/pp28

Date of release: 1996 Nov 21

Document order number:

9397 750 01075

Part Number PCD3310

Document Outline