Description
The SN751177 and SN751178 dual differential drivers and receivers are monolithic integrated circuits that are designed for balanced multipoint bus transmission at rates up to 10 Mbit/s. They are designed to improve the performance of full-duplex data communications over long bus lines and meet ANSI Standards TIA/EIA-422-B and TIA/EIA-485-A and ITU Recommendations V.10 and V.11.
The SN751177 and SN751178 driver outputs provide limiting for both positive and negative currents and thermal-shutdown protection from line-fault conditions on the transmission bus line.
The receiver features high input impedance of at least 12 kΩ, an input sensitivity of ±200 mV over a common-mode input voltage range of –12 V to 12 V, and typical input hysteresis of 50 mV. Fail-safe design ensures that if the receiver inputs are open, the receiver outputs always will be high.
The SN751177 and SN751178 are characterized for operation from –20°C to 85°C.
FEATURES
- Meet or Exceed the Requirements of ANSI Standards TIA/EIA-422-B and TIA/EIA-485-A and ITU Recommendations V.10 and V.11
- Designed for Multipoint Bus Transmission on Long Bus Lines in Noise Environments
- Driver Positive- and Negative-Current Limiting
- Thermal Shutdown Protection
- Driver 3-State Outputs
- Receiver Common-Mode Input Voltage Range of –12 V to 12 V
- Receiver Input Sensitivity... ±200 mV
- Receiver Hysteresis . . . 50 mV Typ
- Receiver Input Impedance . . . 12 kΩ Min
- Receiver 3-State Outputs (SN751177 Only)
- Operate From Single 5-V Supply
(Picture: Pinout)
