SN75161B, SN75162B

OCTAL GENERAL-PURPOSE INTERFACE BUS TRANSCEIVERS

SLLS005B – OCTOBER 1980 – REVISED MAY 1995

2

POST OFFICE BOX 655303

description (continued)

The direction of data through these driver-receiver pairs is determined by the DC, TE, and SC (on SN75162B)

enable signals. The SC input on the SN75162B allows the REN and IFC transceivers to be controlled

independently.

The driver outputs (GPIB I/O ports) feature active bus-terminating resistor circuits designed to provide a high

sink current. Each receiver features pnp transistor inputs for high input impedance and hysteresis of 400 mV

for increased noise immunity. All receivers have 3-state outputs to present a high impedance to the terminal

when disabled.

The SN75161B and SN75162B are characterized for operation from 0

°C to 70°C.

Function Tables

SN75161B RECEIVE/TRANSMIT

CONTROLS

BUS-MANAGEMENT CHANNELS

DATA-TRANSFER CHANNELS

DC

TE

ATN†

ATN†

SRQ

REN

IFC

EOI

DAV

NDAC

NRFD

(Controlled by DC)

(Controlled by TE)

H

H

H

R

T

R

R

T

T

R

R

H

H

L

R

T

R

R

R

T

R

R

L

L

H

T

R

T

T

R

R

T

T

L

L

L

T

R

T

T

T

R

T

T

H

L

X

R

T

R

R

R

R

T

T

L

H

X

T

R

T

T

T

T

R

R

H = high level, L = low level, R = receive, T = transmit, X = irrelevant

Direction of data transmission is from the terminal side to the bus side, and the direction of data receiving is from the bus side to the terminal side.

Data transfer is noninverting in both directions.

† ATN is a normal transceiver channel that functions additionally as an internal direction control or talk enable for EOI whenever the DC and TE

inputs are in the same state. When DC and TE are in opposite states, the ATN channel functions as an independent transceiver only.

SN75162B RECEIVE/TRANSMIT

CONTROLS

BUS-MANAGEMENT CHANNELS

DATA-TRANSFER CHANNELS

SC

DC

TE

ATN†

ATN†

SRQ

REN

IFC

EOI

DAV

NDAC

NRFD

(Controlled by DC)

(Controlled by SC)

(Controlled by TE)

H

H

H

R

T

T

T

R

R

H

H

L

R

T

R

T

R

R

L

L

H

T

R

R

R

T

T

L

L

L

T

R

T

R

T

T

H

L

X

R

T

R

R

T

T

L

H

X

T

R

T

T

R

R

H

T

T

L

R

R

H = high level, L = low level, R = receive, T = transmit, X = irrelevant

Direction of data transmission is from the terminal side to the bus side, and the direction of data receiving is from the bus side to the terminal side.

Data transfer is noninverting in both directions.

† ATN is a normal transceiver channel that functions additionally as an internal direction control or talk enable for EOI whenever the DC and TE

inputs are in the same state. When DC and TE are in opposite states, the ATN channel functions as an independent transceiver only.