SN54ABT16657, SN74ABT16657

16-BIT TRANSCEIVERS WITH PARITY GENERATORS/CHECKERS

AND 3-STATE OUTPUTS

SCBS103B – FEBRUARY 1992 – REVISED JANUARY 1997

2

POST OFFICE BOX 655303

description (continued)

In the receive mode, after the 1B (or 2B) bus is polled to determine the number of high bits, the 1ERR (or 2ERR)

output logic level indicates whether or not the data to be received exhibits the correct parity sense. For example,

if 1ODD/EVEN is high (odd parity selected), 1PARITY is high, and there are three high bits on the 1B bus, then

1ERR is low, indicating a parity error.

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

The SN54ABT16657 is characterized for operation over the full military temperature range of –55

°C to 125°C.

The SN74ABT16657 is characterized for operation from –40

°C to 85°C.

FUNCTION TABLE

(each 8-bit section)

NUMBER OF A OR B

INPUTS

INPUT/OUTPUT

OUTPUTS

NUMBER OF A OR B

INPUTS THAT ARE HIGH

OE

T/R

ODD/EVEN

INPUT/OUTPUT

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