SN28838
PAL-COLOR SUBCARRIER GENERATOR
SOCS029B AUGUST 1991
Copyright
©
1991, Texas Instruments Incorporated
4-1
POST OFFICE BOX 655303
·
DALLAS, TEXAS 75265
·
Solid-State Reliability
·
Surface-Mount Package
description
The SN28838 is a monolithic integrated circuit
designed to interface with the SN28837 PAL-
timing generator in order to generate the
PAL-color timing signals. It receives inputs from
the SN28837 and a 17-MHz oscillator and outputs
the PAL-color subcarrier, color subcarrier delayed
by 90 degrees, and burst-color-subcarrier signals,
which are all 4.43-MHz outputs.
The SN28838 is supplied in a 16-pin surface-
mount package and is characterized for operation
from 0
°
C to 40
°
C.
logic symbol
SC
9
SC
SC (90)
10
SC (90)
BSC
11
BSC
LOCK
13
Lock
Pwr Dwn
3
PD
Phase Del
4
LSW
Clock
7
CLK13M
Xtal
15
X2
Xtal
16
X1
G
G
G
PAL CLR SUBCARR GEN
SN28838
LSW SC (90) BSC
SC 90
°
H
L
SC + 90
°
SC 90
°
SC + 180
°
This device contains circuits to protect its inputs and outputs against damage due to high static voltages or electrostatic fields. These
circuits have been qualified to protect this device against electrostatic discharges (ESD) of up to 2 kV according to MIL-STD-883C,
Method 3015; however, precautions should be taken to avoid application of any voltage higher than maximum-rated voltages to these
high-impedance circuits. During storage or handling, the device leads should be shorted together or the device should be placed in
conductive foam. In a circuit, unused inputs should always be connected to an appropriate logic voltage level, preferably either VCC or ground.
Specific guidelines for handling devices of this type are contained in the publication
Guidelines for Handling Electrostatic-Discharge-Sensitive
(ESDS) Devices and Assemblies available from Texas Instruments.
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
GND
V
DD1
PD
LSW
V
CC
GND
CLK13M
V
DD2
X1
X2
V
CC
LOCK
PLLFIL
BSC
SC(90)
SC
NS PACKAGE
(TOP VIEW)
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of Texas Instruments
standard warranty. Production processing does not necessarily include
testing of all parameters.
SN28838
PAL-COLOR SUBCARRIER GENERATOR
SOCS029B AUGUST 1991
4-2
POST OFFICE BOX 655303
·
DALLAS, TEXAS 75265
Terminal Functions
TERMINAL
I/O
DESCRIPTION
NAME
NO.
I/O
DESCRIPTION
BSC
11
O
Burst subcarrier
CLK13M
7
I
13.34-MHz clock from SN28837
GND
1
Ground
GND
6
Ground
LOCK
13
O
PLL lock signal. LOCK is high when the phase-locked loop is locked.
LSW
4
I
Line switch (from SN28837)
PD
3
I
Power down
PLLFIL
12
Terminal for PLL filter
SC
9
O
Subcarrier
SC(90)
10
O
Subcarrier 90
°
out of phase
VCC
5
Power supply voltage
VCC
14
Power supply voltage
VDD1
2
Power supply voltage for X1
VDD2
8
Power supply voltage for CLK13M
X1
16
Crystal oscillator
X2
15
Crystal oscillator
These two terminals should be connected together externally.
LSW
SC(90)
BSC
0
°
0
°
SC 90
°
SC + 90
°
SC + 180
°
SC
SC 90
°
Figure 1. SC, SC(90), and BSC Timing
SN28838
PAL-COLOR SUBCARRIER GENERATOR
SOCS029B AUGUST 1991
4-3
POST OFFICE BOX 655303
·
DALLAS, TEXAS 75265
absolute maximum ratings over operating free-air temperature range (unless otherwise noted)
Supply voltage range, V
CC
(see Note 1)
0.3 V to 7 V
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Input voltage range, V
I
0.3 V to V
CC
+ 0.3 V
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Output voltage range, V
O
0.3 V to V
CC
+ 0.3 V
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Operating free-air temperature range, T
A
30
°
C to 75
°
C
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Storage temperature range
55
°
C to 125
°
C
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Lead temperature 1,6 mm (1/16 inch) from case for 10 seconds
260
°
C
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Continuous total power dissipation
200 mW
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Stresses beyond those listed under "absolute maximum ratings" may cause permanent damage to the device. These are stress ratings only, and
functional operation of the device at these or any other conditions beyond those indicated under "recommended operating conditions" is not
implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
NOTES:
1. All voltage values are with respect to the GND terminal.
recommended operating conditions
MIN
NOM
MAX
UNIT
Supply voltage, VCC
4.5
5
5.5
V
High-level input voltage, VIH
VCC
×
0.7
V
Low-level input voltage, VIL
0.8
V
Operating frequency
17.735
MHz
Power-up time
300
µ
s
Operating free-air temperature, TA
20
45
°
C
electrical characteristics over recommended operating free-air temperature range (unless
otherwise noted)
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNIT
VOH
High-level output voltage
BSC SC SC(90)
VCC = 4.5 V,
IOH = 2 mA
3.5
V
VOL
Low-level output voltage
BSC, SC, SC(90)
VCC = 4.5 V,
IOL = 2 mA
0.5
V
IIH
High-level input current (except X1)
VI = 5 V
100
nA
IIL
Low-level input current
VI = 0
30
200
370
µ
A
Output frequency
BSC, SC, SC(90)
4.43
MHz
ICC
Supply current
5
20
mA
All inputs except X1 have pullup current sources.
switching characteristics
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNIT
tr
Rise time
CL = 50 pF
50
ns
tf
Fall time
CL = 50 pF
50
ns
SN28838
PAL-COLOR SUBCARRIER GENERATOR
SOCS029B AUGUST 1991
4-4
POST OFFICE BOX 655303
·
DALLAS, TEXAS 75265
MECHANICAL DATA
NS/R-PDSO-G**
PLASTIC SMALL-OUTLINE PACKAGE
8,20
7,40
5,00
5,60
0
°
10
°
0,10
0,20
1,05
0,55
0,40
4040062/A10/93
16
9
1
8
A
2,00 MAX
0,05 MIN
PINS**
DIM
24
15,30
14,70
20
12,90
12,30
16
10,50
9,90
9,90
A MIN
A MAX
10,50
14
16 PIN SHOWN
Seating Plane
0,10
1,27
M
0,25
NOTES: A. All linear dimensions are in millimeters.
B. This drawing is subject to change without notice.
C. Body dimensions do not include mold flash or protrusion not to exceed 0,15.
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any product or service without notice, and advise customers to obtain the latest version of relevant information
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subject to the terms and conditions of sale supplied at the time of order acknowledgement, including those
pertaining to warranty, patent infringement, and limitation of liability.
TI warrants performance of its semiconductor products to the specifications applicable at the time of sale in
accordance with TI's standard warranty. Testing and other quality control techniques are utilized to the extent
TI deems necessary to support this warranty. Specific testing of all parameters of each device is not necessarily
performed, except those mandated by government requirements.
CERTAIN APPLICATIONS USING SEMICONDUCTOR PRODUCTS MAY INVOLVE POTENTIAL RISKS OF
DEATH, PERSONAL INJURY, OR SEVERE PROPERTY OR ENVIRONMENTAL DAMAGE ("CRITICAL
APPLICATIONS"). TI SEMICONDUCTOR PRODUCTS ARE NOT DESIGNED, AUTHORIZED, OR
WARRANTED TO BE SUITABLE FOR USE IN LIFE-SUPPORT DEVICES OR SYSTEMS OR OTHER
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BE FULLY AT THE CUSTOMER'S RISK.
In order to minimize risks associated with the customer's applications, adequate design and operating
safeguards must be provided by the customer to minimize inherent or procedural hazards.
TI assumes no liability for applications assistance or customer product design. TI does not warrant or represent
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Copyright
©
1998, Texas Instruments Incorporated
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