5 V, 3.3 V and 2.5 V UART with 16-byte FIFOs

SC16C550B

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Features

  • 5 V, 3.3 V and 2.5 V operation
  • Industrial temperature range
  • After reset, all registers are identical to the typical 16C450 register set
  • Capable of running with all existing generic 16C450 software
  • Pin compatibility with the industry-standard ST16C450/550, TL16C450/550, PC16C450/550
  • Up to 3 Mbit/s transmit/receive operation at 5 V, 2 Mbit/s at 3.3 V, and 1 Mbit/s at 2.5 V
  • 5 V tolerant on input only pins
  • 16 byte transmit FIFO
  • 16 byte receive FIFO with error flags
  • Programmable auto-RTS and auto-CTS
    • In auto-CTS mode, CTS controls transmitter
    • In auto-RTS mode, RX FIFO contents and threshold control RTS
  • Automatic hardware flow control
  • Software selectable baud rate generator
  • Four selectable Receive FIFO interrupt trigger levels
  • Standard modem interface
  • Standard asynchronous error and framing bits (Start, Stop, and Parity Overrun Break)
  • Independent receiver clock input
  • Transmit, Receive, Line Status, and Data Set interrupts independently controlled
  • Fully programmable character formatting:
    • 5, 6, 7, or 8-bit characters
    • Even, odd, or no-parity formats
    • 1, 1 1/2, or 2-stop bit
    • Baud generation (up to 3 Mbit/s)
  • False start-bit detection
  • Complete status reporting capabilities
  • 3-state output TTL drive capabilities for bidirectional data bus and control bus
  • Line break generation and detection
  • Internal diagnostic capabilities:
    • Loopback controls for communications link fault isolation
  • Prioritized interrupt system controls
  • Modem control functions (CTS, RI, DCD, DSR, DTR, RTS)

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