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SN55ALS161J Datasheet(PDF) 2 Page - Texas Instruments |
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SN55ALS161J Datasheet(HTML) 2 Page - Texas Instruments |
2 / 16 page SN55ALS161, SN75ALS161 OCTAL GENERAL-PURPOSE INTERFACE BUS TRANSCEIVERS SLLS019E – JUNE 1986 – REVISED NOVEMBER 1999 2 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 description (continued) The driver outputs general-purpose interface bus (GPIB I/O ports) feature active bus-terminating resistor circuits designed to provide a high impedance to the bus when VCC = 0. The drivers are designed to handle sink-current loads up to 48 mA. Each receiver features pnp transistor inputs for high input impedance and hysteresis of 400 mV on the commercial part, 250 mV on the military part, minimum, for increased noise immunity. All receivers have 3-state outputs to present a high impedance to the terminal when disabled. The SN55ALS161 is characterized for operation over the full military temperature range of –55 °C to 125°C. The SN75ALS161 is characterized for operation from 0 °C to 70°C. FUNCTION TABLE 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. |
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