1

PS2012E

08/08/06

PinConfiguration

Inputs

OE

T/R

Outputs

L

L

Bus B Data to Bus A

L

H

Bus A Data to Bus B

H

X

High Z State

1.

H = High Voltage Level, X = Don't Care, L = Low

Voltage Level, Z = High Impedance

Pin Name

Description

OE

3-State Output Enable Inputs (Active LOW)

T/R

Transmit/Receive Input

Side A Inputs or 3-State Outputs

Side B Inputs or 3-State Outputs

GND

Ground

Power

Pin Description

Fast CMOS Octal Bidirectional Transceivers

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PI74FCT245T

PI74FCT2245T (25

Ω

Ω

Ω

Ω

Ω Series)

Block Diagram

Description

Pericom Semiconductor’s PI74FCT245T and PI74FCT2245T are

8-bit wide octal buffer bidirectional transceivers designed for

asynchronous two-way communication between data buses. The

transmit/receive (T/R) input determines the direction of data flow

throughthebidirectionaltransceiver.Transmit(activeHIGH)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 Hi-Z condition.

PI74FCT2245T has a built-in 25-ohm series resistor on all outputs to

reduce noise because of reflections, thus eliminating the need for an

external terminating resistor.

Features

• Pin compatible with bipolar FAST™ Series at a higher speed

and lower power consumption

• 25-ohm series resistor on all outputs (FCT2245Tonly)

• TTL input and output levels

• Low ground bounce outputs

• Extremely low static power

• Hysteresis on all inputs

• Industrial operating temperature range: –40°C to +85°C

• Packaging (Pb-free & Green Available):

– 20-pin 173-mil wide plastic TSSOP (L)

– 20-pin 300-mil wide plastic SOIC (S)

– 20-pin 209-mil wide plastic SSOP (H)

– 20-pin 150-mil wide plastic QSOP (Q)

1

2

3

4

5

6

7

8

9

10

20

19

18

17

16

15

14

13

12

11

T/R

GND

Vcc

OE

A0

B0

OE

A1

B1

A2

B2

A3

B3

A4

B4

A5

B5

A6

B6

A7

B7

T/R

06-0207