Diodes Menu Close
Back to UART - Universal Asynchronous Receiver / Transmitter


16C550 Dual UART Bridge Controller

Contact Sales

Log in or register to manage email notifications about changes to datasheets or PCNs for this part.


The PI7C9X752 (752), is a 1.62V to 3.6V dual Universal Asynchronous Receiver and Transmitter (UART) with 5V tolerant serial
(modem) inputs. The highly integrated device is designed for high bandwidth requirement in communication systems.
Each UART has its own 16C550 compatible set of configuration registers, TX and RX FIFOs of 64 bytes, fully programmable transmit
and receive FIFO trigger levels, TX and RX FIFO level counters, automatic RTS/CTS hardware flow control with programmable
hysteresis, automatic software (Xon/Xoff) flow control, RS-485 half-duplex direction control, Intel or Motorola bus interface and
sleep mode for power saving.


  • Remote Access Servers
  • Ethernet Network to Serial Ports
  • Network Management
  • Factory Automation and Process Control
  • Point-of-Sale Systems
  • Multi-port RS-232/RS-422/RS-485 Cards


  • 1.62V to 3.6V with 5V Tolerant Serial Inputs
  • Programmable Sleep Mode with automatic wake-up
    - Intel or Motorola Data Bus Interface select
  • Each UART is independently controlled with:
     - 16C550 Compatible Register Set
     -  64-byte Transmit and Receive FIFOs
     - Transmit and Receive FIFO Level Counters
     -  Programmable TX and RX FIFO Trigger Levels for DMA and Interrupt Generation
          →  Programmable Receive FIFO Trigger Levels for Software/Hardware Flow Control
          →  Programmable hysteresis(Table A-D) for Software/
  • Hardware Flow Control
     - Automatic RTS/CTS Flow Control
     - Automatic Xon/Xoff Software Flow Control with
  • Optional Data Flow Resume by Xon Any Character
     → DMA Signaling Capability for both Received and Transmitted Data
     - RS485 HDX Control Output
     - RS485 auto address detection
     - Infrared (IrDA 1.0/1.1) Data Encoder/Decoder
     - Programmable Data Rate with Prescaler
  • Up to 16 Mbps Serial Data Rate with 64MHz external clock input
  • Crystal oscillator(up to 24MHz) or external clock(up to 80MHz) input
  • Built in Power-On-Reset Circuit

Product Specifications

Product Parameters

Ports 2 UART
Pins 48
Data Rate (kbps) 20Mbps
Bytes 64
Tx/Rx FIFO Ctrs Yes
Tx/Rx FIFO INT Trig Yes
Auto RTS/CTS Yes
Interface 8-Bits
Ambient or Junction Temperature (°C) -40 to 85

Technical Documents

Recommended Soldering Techniques


Additional Technical Documents are available upon request:
Application information, Evaluation board, and Other technical documents

Request Documents
Orderable Part Number Status Package Environmental Compliance Packing Buy from Distributor /
Contact Sales
Request Samples
Qty. Carrier
PI7C9X752FAE Active TQFP-48 GREEN 250 TRAY Contact Sales Request Sample
PI7C9X752FAEX Active TQFP-48 GREEN 2000 T&R Contact Sales Request Sample

Environmental Compliance Legend:
LFF: Pb-Free Finish and RoHS 5/6
TLFP: Totally Pb-Free Product and RoHS 6/6
LFGP: Pb-free Finish and Green Product, RoHS 5/6 and Halogen Free
TPGP: Totally Pb-Free and Green Product, RoHS 6/6 and Halogen Free
GREEN: Halogen-free and RoHS compliant
RoHS: RoHS compliant but NOT halogen-free