1

PS7068C

8/22/97

Product Description

Pericom Semiconductor’s PI74FCT3 series of logic circuits are

produced in the Company’s advanced 0.6 micron CMOS

technology, achieving industry leading speed grades.

The PI74FCT3245 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 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, disables both A and B ports by placing them in HIGH Z

condition.

The PI74FCT3245 can be driven from either 3.3V or 5.0V devices

allowing this device to be used as a translator in a mixed

3.3V/5.0V system.

Logic Block Diagram

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PI74FCT3245

Fast CMOS 3.3V 8-Bit

Bidirectional Transceiver

ProductPinConfiguration

Product Pin Description

Pin Name

Description

OE

3-State Output Enable

Inputs (Active LOW)

T/R

Direction Control Input

A7-A0

Side A Inputs or

3-State Outputs

B7-B0

Side B Inputs or

3-State Outputs

GND

Ground

Power

OE

T/R

L

L

Bus B Data to Bus A

L

H

Bus A Data to Bus B

H

X

High StateZ

Truth Table

Note:

1. H = High Voltage Level, X = Don't Care,

L = Low Voltage Level, Z = High Impedance

Product Features

• Advanced Low Power CMOS Operation

• Compatible with LVC class of products

• Compatible with industry standard

octal pinouts

• Excellent output drive capability:

Balanced Drives (24 mA sink and source)

• Can serve as a 5V to 3V translator

• Inputs can be driven by 3.3V or 5V devices

• 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)

OE

T/

1

1

2

3

4

5

6

7

8

9

10

20

19

18

17

16

15

14

13

12

11

VCC

OE

B0

B1

B2

B3

B4

B5

B6

B7

T/R

A0

A1

A2

A3

A4

A5

A6

A7

GND

20-PIN

L20

Q20

R20

S20