DS75160A Datasheet, PDF (4/10 Pages) National Semiconductor (TI) – IEEE-488 GPIB Transceivers

Switching Load Configurations
DS005804-8
V_C logic high = 3.0V
V_C logic low = 0V
*C_L includes jig and probe capacitance
FIGURE 1.
Connection Diagrams
V_C logic high = 3.0V
V_C logic low = 0V
*C_L includes jig and probe capacitance
FIGURE 2.
DS005804-9
Dual-In-Line Package
DS005804-2
Top View
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 connected to
the eight data bus lines, designated DIO₁–DIO₈. The port
connections to the bus lines have internal terminators, in ac-
cordance with the IEEE-488 Standard, that are deactivated
when the device is powered down. This feature guarantees
no bus loading when V_CC = 0V. The bus port outputs also
have a control mode that either enables or disables the ac-
tive upper stage of the totem-pole configuration. When this
control input, denoted PE, is in the high state, the bus out-
puts 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 organi-
zation 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 configu-
ration. 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 trans-
ceiver 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 identi-
cal to the DS75160A.
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