3.3 V/5.0 V Dual Universal Asynchronous Receiver/Transmitter (DUART)

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SC28L92 Block Diagram

SC28L92 Block Diagram

Block diagram: SC28L92A1A, SC28L92A1B


  • Member of IMPACT family: 3.3 V to 5.0 V, -40 Cel to +85 Cel and 68xxx or 80xxx bus interface for all devices
  • Dual full-duplex independent asynchronous receiver/transmitters
  • 16 character FIFOs for each receiver and transmitter
  • Pin programming selects 68xxx or 80xxx bus interface
  • Programmable data format
    • 5 data to 8 data bits plus parity
    • Odd, even, no parity or force parity
    • 1 stop, 1.5 stop or 2 stop bits programmable in 1/16-bit increments
  • 16-bit programmable counter/timer
  • Programmable baud rate for each receiver and transmitter selectable from:
    • 28 fixed rates: 50 kBd to 230.4 kBd
    • Other baud rates to 1 MHz at 16x
    • Programmable user-defined rates derived from a programmable counter/timer
    • External 1x or 16x clock
  • Parity, framing, and overrun error detection
  • False start bit detection
  • Line break detection and generation
  • Programmable channel mode
    • Normal (full-duplex)
    • Automatic echo
    • Local loopback
    • Remote loopback
    • Multi-drop mode (also called wake-up or 9-bit)
  • Multi-function 7-bit input port (includes IACKN)
    • Can serve as clock or control inputs
    • Change of state detection on four inputs
    • Inputs have typically > 100 kΩ pull-up resistors
    • Change of state detectors for modem control
  • Multi-function 8-bit output port
    • Individual bit set/reset capability
    • Outputs can be programmed to be status/interrupt signals
    • FIFO status for DMA interface
  • Versatile interrupt system
    • Single interrupt output with eight maskable interrupting conditions
    • Output port can be configured to provide a total of up to six separate interrupt outputs that may be wire ORed
    • Each FIFO can be programmed for four different interrupt levels
    • Watchdog timer for each receiver
  • Maximum data transfer rates: 1x - 1 Mbit/s, 16x - 1 Mbit/s
  • Automatic wake-up mode for multi-drop applications
  • Start-end break interrupt/status
  • Detects break which originates in the middle of a character
  • On-chip crystal oscillator
  • Power-down mode
  • Receiver time-out mode
  • Single 3.3 V or 5 V power supply
  • Powers up to emulate SC26C92


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Design Resources

Design Files

2 design files

  • Symbols and Footprints

    SC28L92A1B-QFP44-CAD Symbol and PCB Footprint – BXL File

  • Symbols and Footprints

    SC28L92A1B-QFP4-CAD Symbol and PCB Footprint – BXL File

Engineering Services

3 engineering services

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