74ABT657_3

All information provided in this document is subject to legal disclaimers.

© NXP B.V. 2010. All rights reserved.

Product data sheet

Rev. 03 — 15 March 2010

4 of 17

NXP Semiconductors

74ABT657

Octal transceiver with parity generator/checker; 3-state

5.

Pinning information

5.1 Pinning

5.2 Pin description

Fig 4.

Pin configuration

74ABT657

T/R

OE

A0

B0

A1

B1

A2

B2

A3

B3

A4

GND

GND

A5

B4

A6

B5

A7

B6

ODD/EVEN

B7

ERROR

PARITY

001aae825

1

2

3

4

5

6

7

8

9

10

11

12

14

13

16

15

18

17

20

19

22

21

24

23

Table 2.

Pin description

Symbol

Pin

Description

T/R

1

transmit/receive input

A0 to A7

2, 3, 4, 5, 6, 8, 9, 10

A port input/3-state output

7

positive supply voltage

ODD/EVEN

11

parity select input

ERROR

12

error output in receive mode

PARITY

13

parity output in transmit mode/input in

receive mode

B0 to B7

23, 22, 21, 20, 17, 16, 15, 14

B port input/3-state output

GND

18, 19

ground (0 V)

OE

24

output enable input (active LOW)