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SN75161BB Datasheet(PDF) 2 Page - Texas Instruments |
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SN75161BB Datasheet(HTML) 2 Page - Texas Instruments |
2 / 14 page SN75161B, SN75162B OCTAL GENERAL-PURPOSE INTERFACE BUS TRANSCEIVERS SLLS005B – OCTOBER 1980 – REVISED MAY 1995 2 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 description (continued) The direction of data through these driver-receiver pairs is determined by the DC, TE, and SC (on SN75162B) enable signals. The SC input on the SN75162B allows the REN and IFC transceivers to be controlled independently. The driver outputs (GPIB I/O ports) feature active bus-terminating resistor circuits designed to provide a high impedance to the bus when supply voltage VCC is 0. The drivers are designed to handle loads up to 48 mA of sink current. Each receiver features pnp transistor inputs for high input impedance and hysteresis of 400 mV for increased noise immunity. All receivers have 3-state outputs to present a high impedance to the terminal when disabled. The SN75161B and SN75162B are characterized for operation from 0 °C to 70°C. Function Tables SN75161B 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. SN75162B RECEIVE/TRANSMIT CONTROLS BUS-MANAGEMENT CHANNELS DATA-TRANSFER CHANNELS SC DC TE ATN† ATN† SRQ REN IFC EOI DAV NDAC NRFD (Controlled by DC) (Controlled by SC) (Controlled by TE) H H H R T T T R R H H L R T R T R R L L H T R R R T T L L L T R T R T T H L X R T R R T T L H X T R T T R R H T T L 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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