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PDF DS75162A Data sheet ( Hoja de datos )
| Número de pieza | DS75162A | |
| Descripción | IEEE-488 GPIB Transceivers | |
| Fabricantes | National Semiconductor | |
| Logotipo |  |
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February 1996
DS75160A DS75161A DS75162A
IEEE-488 GPIB Transceivers
General Description
This family of high-speed-Schottky 8-channel bi-directional
transceivers is designed to interface TTL MOS logic to the
IEEE Standard 488-1978 General Purpose Interface Bus
(GPIB) PNP inputs are used at all driver inputs for minimum
loading and hysteresis is provided at all receiver inputs for
added noise margin The IEEE-488 required bus termination
is provided internally with an active turn-off feature which
disconnects the termination from the bus when VCC is re-
moved
The General Purpose Interface Bus is comprised of 16 sig-
nal lines 8 for data and 8 for interface management The
data lines are always implemented with DS75160A and the
management lines are either implemented with DS75161A
in a single-controller system or with DS75162A in a multi-
controller system
Features
Y 8-channel bi-directional non-inverting transceivers
Y Bi-directional control implemented with TRI-STATE
output design
Y Meets IEEE Standard 488-1978
Y High-speed Schottky design
Y Low power consumption
Y High impedance PNP inputs (drivers)
Y 500 mV (typ) input hysteresis (receivers)
Y On-chip bus terminators
Y No bus loading when VCC is removed
Y Pin selectable open collector mode on DS75160A driv-
er outputs
Y Accommodates multi-controller systems
Connection Diagrams
Dual-In-Line Package
Dual-In-Line Package
Top View
TL F 5804 – 1
Order Number DS75160AN or DS75160AWM
See NS Package Number M20B or N20A
TL F 5804 – 15
Order Number DS75162AWM DS75162AN
See NS Package Number M24B or N24B
Dual In-Line Package
TRI-STATE is a registered trademark of National Semiconductor Corporation
C1996 National Semiconductor Corporation TL F 5804
TL F 5804 – 16
Order Number DS75161AN or DS75161AWM
See NS Package Number M20B or N20B
RRD-B30M36 Printed in U S A
http www national com
1 page  
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
Classi-
fication
Mne-
monic
Definition
Device
DC Direction Control DS75161A
DS75162A
Control
Signals
PE Pull-Up Enable
TE Talk Enable
DS75160A
All
SC System Controller DS75162A
Data
I O Ports
B1–B8 Bus Side of Device
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
TL F 5804 – 4
5 http www national com
5 Page | ||
| Páginas | Total 10 Páginas | |
| PDF Descargar | [ Datasheet DS75162A.PDF ] | |
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