SN75178B

SN75177B, SN75178B DIFFERENTIAL BUS REPEATERS Meets EIA Standards RS-422-A and RS-485 and CCITT Recommendations V.11 and X.27 Designed for Multipoint Transmission on Long Bus Lines in Noisy Environments 3-State Outputs Bus Voltage Range . . . – 7 V to 12 V Positive and Negative Current Limiting Driver Output Capability . . . 60 mA Max Driver Thermal Shutdown Protection Receiver Input Impedance . . . 12 kΩ Min Receiver Input Sensitivity . . . ± 200 mV Receiver Input Hysteresis . . . 50 mV Typ Operates From Single 5-V Supply Low Power Requirements description SLLS002C – D2606, JULY 1985 – REVISED FEBRUARY 1993 SN75177B . . . D OR P PACKAGE (TOP VIEW) VCC T EN GND 1 2 3 4 8A 7B 6Z 5Y SN75178B . . . P PACKAGE (TOP VIEW) VCC T EN GND 1 2 3 4 8A 7B 6Z 5Y THE SN75177B IS NOT RECOMMENDED FOR NEW DESIGN The SN75177B and SN75178B differential bus repeaters are monolithic integrated devices each designed for one-way data communication on multipoint bus transmission lines. These devices are designed for balanced transmission bus line applications and meet EIA Standard RS-422-A and RS-485 and CCITT Recommendations V.11 and X.27. Each device is designed to improve the performance of the data communication over long bus lines. The SN75177B and SN75178B are identical except for the complementary enable inputs, which allow the devices to be used in pairs for bidirectional communication. The SN75177B and SN75178B feature positive- and negative-current limiti...