HD75161A Datasheet | Hitachi Semiconductor

Description The HD75161A is an 8 channel general purpose interface bus transceiver designed to meet the requirements of IEEE standard 488-1978. The transceiver is to provide the bus management and data transfer signals during operating in a controller instrumentation system. When bined with the HD75160A octal bus transceiver, the HD75161A provides the plete 16 wire interface for the IEEE 488 bus. The HD75161A features eight driver receiver pairs connected in a front to back configureation to form input/output ports at both the bus and terminal sides. The direction of data through these driver receiver pairs is determined by the DC and TE enable signals. The device exhibits a high impedance to the bus when VCC = 0 V since the bus terminating resistors are built in. If featurs driver outputs which can handle loads up to 48 m A of sink current. Each receiver features p n p transistor inputs for high input impedance and guaranteed hysteresis of 400 m V for increased noise immunity. Pin Arrangement TE 1 REN 2 IFC 3 GPIB I/O PORTS NDAC NRFD 20 VCC 19 REN 18 IFC 17 16 NDAC NRFD TERMINAL I/O PORTS 4 5 DAV 6 EOI 7 ATN 8 SRQ 9 GND 10 15 DAV 14 EOI 13 ATN 12 SRQ 11 DC (Top view) Table Of Abbreviation DRIVERS Name DC TE ATN SRQ REN IFC EOI DAV NDAC NRFD Identity Direction Control Talk Enable Attention Service Request Remote Enable Interface Clear End Or Identify Data Valid Not Data Accepted Not Ready For Data Data Transfer Bus Management Class Control Function Table Bus management Channels Controls DC H H L L H L TE H H L L L H ATN H L H L X X R T T R R T R T T R T T ATN- Data transfer Channels IFC EOI DAV NDAC NRFD Controlled By DC R T R R Controlled by TE T R R T R R T R T H : High level L : Low level X : Irrelevant R : Receiver T : Transmit Notes: 1. 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...