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SN75178BD-SN75178BP
Differential Bus Repeaters
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
descriptionThe 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 limiting 3-state outputs for the receiver
and driver. The receiver features high input impedance, input hysteresis for increased noise immunity, and input
sensitivity of ±200 mV over a common-mode input voltage range of –7 V to 12 V. The driver features thermal
shutdown for protection from line fault conditions. Thermal shutdown is designed to occur at a junction
temperature of approximately 150°C. The driver is designed to drive current loads up to 60 mA maximum.
The SN75177B and SN75178B are designed for optimum performance when used on transmission buses
employing the SN75172 and SN75174 differential line drivers, SN75173 and SN75175 differential line
receivers, or SN75176B bus transceiver.
Function Tables
SN75177B
SN75178BH = high level, L = low level, ? = indeterminate, X = irrelevant, Z = impedance (off)
GND
VCC
GND
SN75178B ...P PACKAGE
(TOP VIEW)
THE SN75177B IS NOT
RECOMMENDED FOR NEW DESIGN
