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Manufacturer Part #


XR20M1172 Series 16Mbps 3.6V Two Channel I2C/SPI UART With 64-Byte FIFO-QFN-32

ECAD Model:
Mfr. Name: MaxLinear
Standard Pkg:
Product Variant Information section
Date Code: 1829
Product Specification Section
Technical Attributes
Attributes Table
Data Rate: 16Mbps
No of Functions / Channels: 2
Interface Circuit Type: I2C/SPI
Supply Voltage-Nom: 1.62V to 3.63V
Supply Current: 0.5mA
Power Dissipation: 0.5W
Clock Frequency-Max: 64MHz
Operating Temperature: -40°C to +85°C
Storage Temperature Range: -65°C to +150°C
Package Style:  QFN-32
Mounting Method: Surface Mount
Features & Applications

The XR20M1172¹ (M1172) is a high performance two channel universal asynchronous receiver and transmitter (UART) with 64 byte TX and RX FIFOs and a selectable I²C/SPI slave interface. The M1172 operates from 1.62 to 3.63 volts. It is software compatible to the SC16CIS762/752, but with additional features such as a programmable fractional baud rate generator, and 8X and 4X sampling rate that allows for a maximum baud rate of 16 Mbps at 3.3V.

The standard features include 16 selectable TX and RX FIFO trigger levels, automatic hardware (RTS/CTS) and software (Xon/Xoff) flow control, and a complete modem interface. Onboard registers provide the user with operational status and data error flags. An internal loopback capability allows system diagnostics. The M1172 is available in the 32-pin QFN, 28-pin TSSOP and 20-pin TSSOP packages. The 32-pin QFN package has the EN485# and ENIR# pins to allow the UART to power-up in the Auto RS485 mode or the Infrared mode.

NOTE: ¹Covered by U.S. Patent #5,649,122


  • 1.62 to 3.6 Volt Operation
  • S/W compatible to Philips' SC16IS762/752
  • Selectable I²C/SPI Interface
  • Full-featured UART
    • Data rate of up to 16 Mbps at 3.3V
    • Data rate of up to 12.5 Mbps at 2.5V
    • Data rate of up to 8 Mbps at 1.8V
    • Fractional Baud Rate Generator
    • Transmit and Receive FIFOs of 64 bytes
    • 16 Selectable TX and RX FIFO Trigger Levels
    • Automatic Hardware (RTS/CTS) Flow Control
    • Automatic Software (Xon/Xoff) Flow Control
    • Halt and Resume Transmission Control
    • Automatic RS-485 Half-duplex Direction Control Output via RTS#
    • Wireless Infrared (IrDA 1.0 and 1.1) Encoder/ Decoder
    • Automatic sleep mode (< 15 uA at 3.3V)
    • General Purpose I/Os
    • Full modem interface
  • Crystal oscillator (up to 24MHz) or external clock (up to 64MHz) input
  • 32-QFN, 28-TSSOP, 20-TSSOP packages
  • Pb-Free, RoHS Compliant Versions Offered
Pricing Section
Global Stock:
On Order:
Factory Stock:Factory Stock:
Factory Lead Time:
52 Weeks
Minimum Order:
Multiple Of:
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Web Price
Product Variant Information section