PI74LPT245 Datasheet, PDF (1/4 Pages) Pericom Semiconductor Corporation – Fast CMOS 3.3V 8-Bit Bidirectional Transceiver

PI74LPT245
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Fast CMOS 3.3V 8-Bit ¹
Bidirectional Transceiver
Product Features
2
Product Description
• Compatible with LCX™ and LVT™ 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)
• Low ground bounce outputs
• Hysteresis on all inputs
• Industrial operating temperature range: –40°C to +85°C
• Packages available:
– 20-pin 173 mil wide plastic TSSOP (L)
– 20-pin 150 mil wide plastic QSOP (Q)
– 20-pin 150 mil wide plastic TQSOP (R)
– 20-pin 300 mil wide plastic SOIC (S)
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.
3
The PI74LPT245 is an 8-bit bidirectional transceiver designed for
asynchronous two-way communication between data buses. The
transmit/receive input pin (T/R) determines the direction of data
4 ^{flow through the bidirectional transceiver. Transmit (active HIGH)}
enables data from A ports to B ports, and receive (active LOW) from
B ports to A ports. The output enable (OE) input, when HIGH,
5 ^{disables both A and B ports by placing them in HIGH Z condition.}
The PI74LPT245 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.
6
Logic Block Diagram
TT/R
A0
A1
A2
A3
A4
A5
A6
A7
Product Pin Configuration Product Pin Description
T^/RR 1
20 VCC
A0 2
19 O_OE_E
OE
A1 3 20-PIN ^{18 B0}
A2 4 ^{L20 17 B1}
A3 5 ^{Q20 16 B2}
B0
A4 6 ^{R20 15 B3}
A5 7 ^{S20 14 B4}
A6 8
13 B5
B1
A7 9
12 B6
GND 10
11 B7
Pin Name
OE
T/R
A7-A0
B7-B0
GND
VCC
Description
3-State Output Enable
Inputs (Active LOW)
Direction Control Input
Side A Inputs or
3-State Outputs
Side B Inputs or
3-State Outputs
Ground
Power
B2
Truth Table
B3
Inputs⁽¹⁾
OE
T/R
Outputs⁽¹⁾
L
L
Bus B Data to Bus A
B4
L
H
Bus A Data to Bus B
H
X
High StateZ
B5
Note:
1. H = High Voltage Level, X = Don't Care,
B6
L = Low Voltage Level, Z = High Impedance
7
8
9
10
11
12
13
14
15
B7
1
PS2059A 01/15/97