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    DS78C20J device package

    DS78C20J device package

    DS78C20J dimensions

    DS78C20J dimensions

    DS78C20J pin connection diagram

    DS78C20J pin connection diagram

    An electronic device which translates the differential voltage signals into standard logic signals is known as a differential line receiver. When combined with differential voltage drivers, these line receivers form the transceivers for the RS-485, RS-422, and RS-232 serial digital communication systems. Differential signals are used in these communication systems because of better noise immunity and high bit-rate capacity. 

    What is DS78C20J/883?

    The DS78C20J is a dual CMOS compatible differential line receiver manufactured by National Semiconductor. This line receiver can be used for both balanced and unbalanced digital transmission systems. The DS78C20J complies with EIA and Federal standards. The input noise sensitivity to the noise spikes can be configured using an external capacitor. The receiver includes a 180 Ohm terminating resistor which can be used on twisted pair lines. The module has a working temperature range of -55oC to 125oC.

    Pin Configuration

    The pin configuration of the DS78C20J is provided in the table below:

    Pin number Pin description
    1, 13 Negative input voltage pins
    3, 11 Positive input voltage pins
    2, 12 Termination pins
    4, 10 Strobe pins
    5, 9 Response time adjustment pin
    6, 8 Output pins
    7 Ground pin
    14 Vcc power supply pin


    • Complies with EIA Standards for RS-232, RS-422, and RS-423
    • Complies with Federal Standards 1020 and 1030
    • Input voltage range of +15V (differential or common-code)
    • Dedicated strobe input for each receiver
    • 5Vcc strobe threshold voltage for CMOS compatibility
    • Typical input impedance of 5k Ohm
    • Input hysteresis of 50mV
    • Input threshold of 200mV
    • Operational voltage range of 4.5V to 15V
    • Availability of compatible driver


    The typical applications of DS78C20J are given as following:

    • CMOS differential line receiver in RS-422 serial communication systems
    • CMOS differential line receiver in RS-423 serial communication systems
    • CMOS differential line receiver in RS-232 serial communication systems
    • AC testing circuit for serial digital communication systems


    The major technical specifications of the DS78C20J are listed as following:

    • Supply voltage: 18V
    • Common-mode input voltage: +25V
    • Differential input voltage: +25V
    • Strobe voltage: 18V
    • Output sink current: 50mA
    • Input resistance: 5k Ohm
    • Line termination resistance: 180 Ohm
    • Data input current: +2mA
    • Temperature range: -55oC to 125oC

    How DS78C20J/883 work?

    The DS78C20J line receivers are used RS-232, RS-422, and RS-423 digital serial communication systems. The built-in termination resistor can be used with the twisted pair lines. These line receivers can also be used in applications with hysteresis. In digital serial communication systems, these line drivers are used in conjunction with differential voltage drivers to form the transceivers for the RS-232/422/423 systems. The DS78C20J CMOS differential line receiver can also be used for construction the AC test circuit for the serial communication systems.

    Differential line receiver application circuit

    Differential line receiver application circuit

    Keywords and Tags

    • DS78C20J
    • DS78C20J/883
    • Dual CMOS compatible Differential Line Receiver
    • Differential Line Receiver
    • RS-232 line receiver
    • RS-422 line receiver
    • RS-423 line receiver
    • National semiconductor differential line receiver

    DS78C20J/883 Related Products Prices

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