DS75161AN datasheet(5/10 Pages) NSC

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Functional Description

DS75160A

This device is an 8-channel bi-directional transceiver with

one common direction control input denoted TE When

used to implement the IEEE-488 bus this device is connect-

ed to the eight data bus lines designated DIO1–DIO8 The

port connections to the bus lines have internal terminators

in accordance with the IEEE-488 Standard that are deacti-

vated when the device is powered down This feature guar-

antees no bus loading when VCC e 0V The bus port out-

puts also have a control mode that either enables or dis-

ables the active upper stage of the totem-pole configura-

tion When this control input denoted PE is in the high

state the bus outputs operate in the high-speed totem-pole

mode When PE is in the low state the bus outputs operate

as open collector outputs which are necessary for parallel

polling

DS75161A

This device is also an 8-channel bi-directional transceiver

which is specifically configured to implement the eight man-

agement signal lines of the IEEE-488 bus This device

paired with the DS75160A forms the complete 16-line inter-

face between the IEEE-488 bus and a single controller in-

strumentation system In compliance with the system orga-

nization of the management signal lines the SRQ NDAC

and NRFD bus port outputs are open collector In contrast

to the DS75160A these open collector outputs are a fixed

configuration The direction control is divided into three

groups The DAV NDAC and NRFD transceiver directions

are controlled by the TE input The ATN SRQ REN and

IFC transceiver directions are controlled by the DC input

The EOI transceiver direction is a function of both the TE

and DC inputs as well as the logic level present on the ATN

channel The port connections to the bus lines have internal

terminators identical to the DS75160A

DS75162A

This device is identical to the DS75161A except that an

additional direction control input is provided denoted SC

The SC input controls the direction of the REN and IFC

transceivers that are normally controlled by the DC input on

the DS75161A This additional control function is instrumen-

tal in implementing multiple controller systems

Table of Signal Line Abbreviations

Signal Line

Mne-

Classi-

monic

Definition

Device

fication

Direction Control

DS75161A

DS75162A

Control

Pull-Up Enable

DS75160A

Signals

Talk Enable

All

System Controller

DS75162A

Data

B1 – B8

Bus Side of Device

IO Ports

D1 – D8 Terminal Side

DS75160A

of Device

ATN

Attention

DAV

Data Valid

EOI

End or Identify

Management

IFC

Interface Clear

DS75161A

Signals

NDAC

Not Data Accepted

DS75162A

NRFD

Not Ready for Data

REN

Remote Enable

SRQ

Service Request

Logic Diagrams

DS75160A

TLF5804 – 4

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