PI74LPT16245
3.3V 16-BIT BIDIRECTIONAL TRANSCEIVER
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PS2068A 01/16/97
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Product Description
Pericom Semiconductor's PI74LPT series of logic circuits are pro-
duced in the Company's advanced 0.6 micron CMOS technology,
achieving industry leading speed grades.
The PI74LPT16245 is a 16-bit bidirectional transceiver designed
for asynchronous two-way communication between data buses.
The direction control input pin (xDIR) determines the direction of
data flow through the bidirectional transceiver. The Direction and
Output Enable controls are designed to operate this device as either
two independent 8-bit transceivers or one 16-bit transceiver. The
output enable (OE) input, when HIGH, disables both A and B ports
by placing them in HIGH Z condition.
The PI74LPT16245 can be driven from either 3.3V or 5.0V devices
allowing this device to be used as a translator in a mixed
3.3/5.0V system.
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PI74LPT16245
Fast CMOS 3.3V 16-Bit
Bidirectional Transceiver
Product Features
·
Compatible with LCXTM and LVTTM families of products
·
Supports 5V Tolerant Mixed Signal Mode Operation
Input can be 3V or 5V
Output can be 3V or connected to 5V bus
·
Advanced Low Power CMOS Operation
·
Excellent output drive capability:
Balanced drives (24 mA sink and source)
·
Pin compatible with industry standard double-density
pinouts
·
Low ground bounce outputs
·
Hysteresis on all inputs
·
Industrial operating temperature range: 40°C to +85°C
·
Multiple center pins and distributed Vcc/GND pins
minimize switching noise
·
Packages available:
48-pin 240 mil wide thin plastic TSSOP (A)
48-pin 300 mil wide plastic SSOP (V)
Logic Block Diagram
1
B
0
1
A
0
1
OE
1
DIR
1
B
1
1
A
1
1
B
2
1
A
2
1
B
3
1
A
3
1
B
4
1
A
4
1
B
5
1
A
5
1
B
6
1
A
6
1
B
7
1
A
7
2
B
0
2
A
0
2
OE
2
DIR
2
B
1
2
A
1
2
B
2
2
A
2
2
B
3
2
A
3
2
B
4
2
A
4
2
B
5
2
A
5
2
B
6
2
A
6
2
B
7
2
A
7
PI74LPT16245
3.3V 16-BIT BIDIRECTIONAL TRANSCEIVER
2
PS2068A 01/16/97
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Product Pin Configuration
Product Pin Description
Pin Name
Description
xOE
3-State Output Enable Inputs (Active LOW)
xDIR
Direction Control Input
xAx
Side A Inputs or 3-State Inputs
xBx
Side B Outputs or 3-State Outputs
GND
Ground
V
CC
Power
Inputs
(1)
X
OE
xDIR
Outputs
(1)
L
L
Bus B Data to Bus A
L
H
Bus A Data to Bus B
H
X
Z
Truth Table
Note:
1. H = High Voltage Level, X = Don't Care,
L = Low Voltage Level, Z = High Impedance
1
DIR
1
1
B
0
2
1
B
1
3
GND
4
1
B
2
5
1
B
3
6
V
CC
7
1
B
4
8
1
B
5
9
GND
10
1
B
6
11
1
B
7
12
2
B
0
13
2
B
1
14
GND
15
2
B
2
16
2
B
3
17
V
CC
18
2
B
4
19
2
B
5
20
GND
21
2
B
6
22
2
B
7
23
2
DIR
24
1
OE
48
1
A
0
47
1
A
1
46
GND
45
1
A
2
44
1
A
3
43
V
CC
42
1
A
4
41
1
A
5
40
GND
39
1
A
6
38
1
A
7
37
2
A
0
36
2
A
1
35
GND
34
2
A
2
33
2
A
3
32
V
CC
31
2
A
4
30
2
A
5
29
GND
28
2
A
6
27
2
A
7
26
2
OE
25
Note:
1. This parameter is determined by device characterization but is not production tested.
Capacitance
(T
A
= 25°C, f = 1 MHz)
Parameters
(1)
Description
Test Conditions
Typ
Max.
Units
C
IN
Input Capacitance
V
IN
= 0 V
4.5
6
pF
C
OUT
Output Capacitance
V
OUT
= 0 V
5.5
8
pF
48-PIN
V48
A48
PI74LPT16245
3.3V 16-BIT BIDIRECTIONAL TRANSCEIVER
3
PS2068A 01/16/97
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DC Electrical Characteristics
(Over the Operating Range, T
A
= 40°C to +85°C, V
CC
= 2.7V to 3.6V)
Parameters
Description
Test Conditions
(1)
Min.
Typ
(2)
Max.
Units
V
IH
Input HIGH Voltage (Input pins)
Guaranteed Logic HIGH Level
2.2
--
5.5
V
Input HIGH Voltage (I/O pins)
2.0
--
5.5
V
V
IL
Input LOW Voltage
Guaranteed Logic LOW Level
0.5
--
0.8
V
(Input and I/O pins)
I
IH
Input HIGH Current (Input pins)
V
CC
= Max.
V
IN
= 5.5V
--
--
±1
µA
Input HIGH Current (I/O pins)
V
CC
= Max.
V
IN
= V
CC
--
--
±1
µA
I
IL
Input LOW Current (Input pins)
V
CC
= Max.
V
IN
= GND
--
--
±1
µA
Input LOW Current (I/O pins)
V
CC
= Max.
V
IN
= GND
--
--
±1
µA
I
OZH
High Impedance Output Current
V
CC
= Max.
V
OUT
= 5.5V
--
--
±1
µA
I
OZL
(3-State Output pins)
V
CC
= Max.
V
OUT
= GND
--
--
±1
µA
V
IK
Clamp Diode Voltage
V
CC
= Min., I
IN
= 18 mA
--
0.7
1.2
V
I
ODH
Output HIGH Current
V
CC
= 3.3V, V
IN
= V
IH
or V
IL
, V
O
= 1.5V
(3)
36
60
110
mA
I
ODL
Output LOW Current
V
CC
= 3.3V, V
IN
= V
IH
or V
IL
, V
O
= 1.5V
(3)
50
90
200
mA
V
OH
Output HIGH Voltage
V
CC
= Min.
I
OH
= 0.1 mA Vcc-0.2
--
--
V
V
IN
= V
IH
or V
IL
I
OH
= 3 mA
2.4
3.0
--
V
V
CC
= 3.0V,
I
OH
= 8 mA
2.4
(5)
3.0
--
V
V
IN
= V
IH
or V
IL
I
OH
= 24 mA
2.0
--
--
V
OL
Output LOW Voltage
V
CC
= Min.
I
OL
= 0.1 mA
--
--
0.2
V
V
IN
= V
IH
or V
IL
I
OL
= 16 mA
--
0.2
0.4
V
I
OL
= 24 mA
--
0.3
0.5
V
I
OS
Short Circuit Current
(4)
V
CC
= Max.
(3)
, V
OUT
= GND
60
85
240
mA
I
OFF
Power Down Disable
V
CC
= 0V, V
IN
or V
OUT
4.5V
--
--
±100
µA
V
H
Input Hysteresis
--
150
--
mV
Maximum Ratings
(Above which the useful life may be impaired. For user guidelines, not tested.)
Note:
Stresses greater than those listed under MAXIMUM
RATINGS may cause permanent damage to the de-
vice. This is a stress rating only and functional opera-
tion of the device at these or any other conditions
above those indicated in the operational sections
of this specification is not implied. Exposure to
absolute maximum rating conditions for extended
periods may affect reliability.
Notes:
1. For Max. or Min. conditions, use appropriate value specified under Electrical Characteristics for the applicable device type.
2. Typical values are at Vcc = 3.3V, +25°C ambient and maximum loading.
3. Not more than one output should be shorted at one time. Duration of the test should not exceed one second.
4. This parameter is guaranteed but not tested.
5. V
OH
= V
CC
0.6V at rated current.
Storage Temperature ............................................................. 55°C to +125°C
Ambient Temperature with Power Applied ............................ 40°C to +85°C
Supply Voltage to Ground Potential (Inputs & Vcc Only) ...... 0.5V to +7.0V
Supply Voltage to Ground Potential (Outputs & D/O Only) .. 0.5V to +7.0V
DC Input Voltage .................................................................... 0.5V to +7.0V
DC Output Current .............................................................................. 120 mA
Power Dissipation .................................................................................... 1.0W
PI74LPT16245
3.3V 16-BIT BIDIRECTIONAL TRANSCEIVER
4
PS2068A 01/16/97
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Power Supply Characteristics
Parameters Description
Test Conditions
(1)
Min.
Typ
(2)
Max.
Units
I
CC
Quiescent Power Supply Current
V
CC
= Max.
V
IN
= GND or V
CC
0.1
10
µA
I
CC
Quiescent Power Supply Current
V
CC
= Max.
V
IN
= V
CC
0.6V
(3)
2.0
30
µA
TTL Inputs HIGH
I
CCD
Dynamic Power Supply
(4)
V
CC
= Max.,
V
IN
= V
CC
50
75
µA/
Outputs Open
V
IN
= GND
MHz
X
OE = xDIR = GND
One Bit Toggling
50% Duty Cycle
I
C
Total Power Supply
V
CC
= Max.,
V
IN
= V
CC
0.6V
0.5
0.8
mA
Current
(6)
Outputs Open
V
IN
= GND
f
I
= 10 MH
Z
50% Duty Cycle
X
OE = xDIR = GND
One Bit Toggling
V
CC
= Max.,
V
IN
= V
CC
0.6V
2.0
3.3
(5)
Outputs Open
V
IN
= GND
f
I
= 2.5 MH
Z
50% Duty Cycle
X
OE = xDIR = GND
16 Bits Toggling
Notes:
1. For Max. or Min. condition, use appropriate value specified under Electrical Characteristics for the applicable device.
2. Typical values are at Vcc = 3.3V, +25°C ambient.
3. Per TTL driven input; all other inputs at Vcc or GND.
4. This parameter is not directly testable, but is derived for use in Total Power Supply Calculations.
5. Values for these conditions are examples of the Icc formula. These limits are guaranteed but not tested.
6. I
C
=I
QUIESCENT
+ I
INPUTS
+ I
DYNAMIC
I
C
= I
CC
+
I
CC
D
H
N
T
+ I
CCD
(f
CP
/2 + f
I
N
I
)
I
CC
= Quiescent Current (I
CCL
, I
CCH
and I
CCZ
)
I
CC
= Power Supply Current for a TTL High Input
D
H
= Duty Cycle for TTL Inputs High
N
T
= Number of TTL Inputs at D
H
I
CCD
= Dynamic Current Caused by an Input Transition Pair (HLH or LHL)
f
CP
= Clock Frequency for Register Devices (Zero for Non-Register Devices)
N
CP
= Number of Clock Inputs at f
CP
f
I
= Input Frequency
N
I
= Number of Inputs at f
I
All currents are in milliamps and all frequencies are in megahertz.
PI74LPT16245
3.3V 16-BIT BIDIRECTIONAL TRANSCEIVER
5
PS2068A 01/16/97
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Switching Characteristics over Operating Range
(1)
LPT16245
LPT16245A
LPT16245C
Com.
Com.
Com.
Parameters
Description
Conditions
(2)
Min.
(3)
Max.
Min.
(3)
Max.
Min.
(3)
Max.
Units
t
PLH
Propagation Delay
C
L
= 50 pF
1.5
5.2
1.5
4.6
1.5
4.1
ns
t
PHL
A to B, B to A
R
L
= 500
t
PZH
Output Enable Time
1.5
7.2
1.5
6.2
1.5
5.8
ns
t
PZL
xOE to A or B
t
PHZ
Output Disable Time
(4)
1.5
7.2
1.5
5.0
1.5
4.8
ns
t
PLZ
xOE to A or B
t
PZH
Output Enable Time
1.5
7.2
1.5
6.2
1.5
5.8
ns
t
PZL
xDIR to A or B
t
PHZ
Output Disable Time
1.5
7.2
1.5
5.0
1.5
4.8
ns
t
PLZ
xDIR to A or B
(4)
t
SK
(o)
Output Skew
(5)
0.5
0.5
0.5
ns
Notes:
1. Propagation Delays and Enable/Disable times are with Vcc = 3.3V ±0.3V, normal range. For Vcc = 2.7V, extended range, all
Propagation Delays and Enable/Disable times should be degraded by 20%.
2. See test circuit and wave forms.
3. Minimum limits are guaranteed but not tested on Propagation Delays.
4. This parameter is guaranteed but not production tested.
5. Skew between any two outputs, of the same package, switching in the same direction. This parameter is guaranteed by design.
Pericom Semiconductor Corporation
2380 Bering Drive · San Jose, CA 95131 · 1-800-435-2336 · Fax (408) 435-1100 · http://www.pericom.com
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