3.3V Quad LPC UART with 128-Byte FIFO


  • 128 Byte Transmit and Receive FIFO
  • Compliant to LPC 1.1 Specifications
  • -40°C to +85°C Industrial Temp Operation
  • Watchdog Timer with WDTOUT# signal
  • 4 independent UART channels
    • Programmable I/O mapped base addresses
    • Data rates up to 3 Mbps
    • Selectable RX FIFO interrupt trigger levels
    • Auto RS-485 Half-Duplex Control mode
    • Programmable character lengths (5, 6, 7, 8) with even, odd, or no parity
    • IrDA mode and separate IRTXA# and IRRXA# pins for the first UART channel
    • 9-bit (Multidrop) mode
  • External 24MHz/48MHz clock
  • Single 3.3V Supply Voltage ( ± 10%)
  • 5V tolerant inputs
  • 48-TQFP package (7mm x 7mm)

  • Industrial and Embedded PCs
  • Factory Automation and Process Controls
  • Network Routers
  • System Board Designs

The XR28V384 (V384) is a quad Universal Asynchronous Receiver and Transmitter (UART) for the Intel Low Pin Count (LPC) bus interface. This device can replace or supplement a Super I/O device to add additional serial ports to the system.

The V384 UARTs support any 16-bit I/O address supported by the system. The register set is based on the industry standard 16550 UART, so the V384 operates with standard serial port drivers without requiring a custom driver to be installed.

The 128 byte Transmit and Receive FIFOs reduce CPU overhead and minimize the chance of buffer overflow and data loss. In addition to the 16550 UART registers, there are also Configuration register set where enhanced features such as the 9-bit (multidrop) mode, IrDA mode and the Watchdog Timer can be enabled.

The V384 is available in a 48-pin TQFP package.

Part NumberPkg CodeRoHSMin
StatusBuy NowOrder Samples
XR28V384IM48-0A-EBBoard   Active

Part Status Legend
Active - the part is released for sale, standard product.
EOL (End of Life) - the part is no longer being manufactured, there may or may not be inventory still in stock.
CF (Contact Factory) - the part is still active but customers should check with the factory for availability. Longer lead-times may apply.
PRE (Pre-introduction) - the part has not been introduced or the part number is an early version available for sample only.
OBS (Obsolete) - the part is no longer being manufactured and may not be ordered.
NRND (Not Recommended for New Designs) - the part is not recommended for new designs. 
CPUInterfaceLPC 1.1
Data Rate@5/3.3/2.5V3
Sup V3.3 - 3.6