SN54ABT657A, SN74ABT657A

OCTAL TRANSCEIVERS WITH PARITY GENERATORS/CHECKERS

AND 3-STATE OUTPUTS

SCBS192E – JANUARY 1991 – REVISED JUNE 1997

2

POST OFFICE BOX 655303

description (continued)

the minimum value of the resistor is determined by the current-sinking capability of the driver.

The SN54ABT657A is characterized for operation over the full military temperature range of –55

°C to 125°C.

The SN74ABT657A is characterized for operation from –40

°C to 85°C.

FUNCTION TABLE

NUMBER OF A OR B

INPUTS

I/O

OUTPUTS

INPUTS THAT ARE HIGH

OE

T/R

ODD/EVEN

PARITY

ERR

OUTPUT MODE

L

H

H

H

Z

Transmit

L

HL

L

Z

Transmit

02468

L

LH

H

H

Receive

0, 2, 4, 6, 8

L

LH

L

L

Receive

L

LL

H

L

Receive

L

LL

L

H

Receive

L

H

H

L

Z

Transmit

L

HL

H

Z

Transmit

1357

L

LH

H

L

Receive

1, 3, 5, 7

L

LH

L

H

Receive

L

LL

H

H

Receive

L

LL

L

L

Receive

Don’t care

H

X

X

Z

Z

Z