[Exar]

GENERAL DESCRIPTION
The ST16C554/554D (554) is a quad Universal Asynchronous Receiver and Transmitter (UART) with 16 bytes of transmit and receive FIFOs, selectable receive FIFO trigger levels and data rates of up to 1.5 Mbps. Each UART has a set of registers that provide the user with operating status and control, receiver error indications, and modem serial interface controls.

FEATURES
 • Pin-to-pin compatible with the industry standard ST16C454, ST68C454, ST68C554, TI’s TL16C554A and Philips’ SC16C554B
 • Intel or Motorola Data Bus Interface select
 • Four independent UART channels
    ■ Register Set Compatible to 16C550
    ■ Data rates of up to 1.5 Mbps at 5 V
    ■ Data rates of up to 500 Kbps at 3.3V
    ■ 16 byte Transmit FIFO
    ■ 16 byte Receive FIFO with error tags
    ■ 4 Selectable RX FIFO Trigger Levels
    ■ Full modem interface
 • 2.97V to 5.5V supply operation
 • Crystal oscillator or external clock input

APPLICATIONS
 • Portable Appliances
 • Telecommunication Network Routers
 • Ethernet Network Routers
 • Cellular Data Devices
 • Factory Automation and Process Controls