SN54ABT833, SN74ABT833

8-BIT TO 9-BIT PARITY BUS TRANSCEIVERS

SCBS195C – FEBRUARY 1991 – REVISED JANUARY 1997

1

POST OFFICE BOX 655303

Significantly Reduces Power Dissipation

MIL-STD-883, Method 3015; Exceeds 200 V

Using Machine Model (C = 200 pF, R = 0)

JEDEC Standard JESD-17

Generator/Checker

Small-Outline (DW) Packages, Ceramic

Chip Carriers (FK), and Plastic (NT) and

Ceramic (JT) DIPs

description

The ’ABT833 8-bit to 9-bit parity transceivers are

designed for communication between data buses.

When data is transmitted from the A bus to the

B bus, a parity bit is generated. When data is

transmitted from the B bus to the A bus with its

corresponding parity bit, the open-collector

parity-error (ERR) output indicates whether or not

an error in the B data has occurred. The

output-enable (OEA and OEB) inputs can be used

to disable the device so that the buses are

effectively isolated. The ’ABT833 provide true

data at their outputs.

A 9-bit parity generator/checker generates a

parity-odd (PARITY) output and monitors the

parity of the I/O ports with the ERR flag. ERR is

clocked into the register on the rising edge of the

clock (CLK) input. The error flag register is cleared

with a low pulse on the clear (CLR) input. When

both OEA and OEB are low, data is transferred

from the A bus to the B bus and inverted parity is

generated. Inverted parity is a forced error

condition that gives the designer more system

diagnostic capability.

Copyright

© 1997, Texas Instruments Incorporated

UNLESS OTHERWISE NOTED this document contains PRODUCTION

DATA information current as of publication date. Products conform to

specifications per the terms of Texas Instruments standard warranty.

Production processing does not necessarily include testing of all

parameters.

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of

Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

EPIC-

ΙΙB is a trademark of Texas Instruments Incorporated.

1

2

3

4

5

6

7

8

9

10

11

12

24

23

22

21

20

19

18

17

16

15

14

13

OEA

A1

A2

A3

A4

A5

A6

A7

A8

ERR

CLR

GND

B1

B2

B3

B4

B5

B6

B7

B8

PARITY

OEB

CLK

SN54ABT833 . . . JT PACKAGE

SN74ABT833 ... DW OR NT PACKAGE

(TOP VIEW)

32 1 28 27

12 13

5

6

7

8

9

10

11

25

24

23

22

21

20

19

B3

B4

B5

NC

B6

B7

B8

A3

A4

A5

NC

A6

A7

A8

426

14 15 16 17 18

SN54ABT833 . . . FK PACKAGE

(TOP VIEW)

NC – No internal connection