UART with 128-Byte FIFO and Infrared (IrDA) Encoder/Decoder


The XR16C850 (850) is a universal asynchronous receiver and transmitter (UART) and is pin compatible with the ST16C650A UART. The 850 is an enhanced UART with 128 byte FIFOs, automatic hardware/soft- ware flow control, and data rates up to 1.5Mbps. It include transmit/receive FIFO counters to increase data loading and unloading from controlling CPU. Onboard status registers provide the user with error indications and operational status.

Modem interface control is included and can be optionally configured to operate with the Infrared (IrDA) encoder/decoder. The system interrupts may be tailored to meet user requirements. An internal loop-back capability allows onboard diagnostics.

The 850 is available in 44 pin PLCC and 48 TQFP packages. The XR16C850 provides both the standard (STD) mode or PC ISA bus (PC) mode. The STD mode is compatible with the ST16C450 and ST16C550 while the PC mode allows connection to the PC ISA bus.

For UART technical support or to obtain an IBIS model for this product, please email Exar's UART Technical Support group.

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  • Pin to pin compatible to ST16C550, ST16C650A and TL16C750
  • Transmit/receive FIFO counters
  • 128 bytes of Transmit/Receive FIFO
  • RS-485 half duplex direction control
  • Automatic software/hardware flow control
  • Programmable, selectable transmit/receive trigger levels
  • Infrared transmitter and receiver encoder/decoder
  • Up to 1.5Mbps data rate
  • Sleep mode (100mA standby)
  • Small 7x7mm TQFP
  • +5 or 3.3 Volts operation
  • Windows 2 drivers available
  • Pb-Free, RoHS Compliant Versions Offered


  • Battery Operated Electronics
  • Internet Appliances
  • Handheld Terminal
  • Personal Digital Assistants
  • Cellular Phones DataPort

Design Tools

Simulation Models
Evaluation Hardware and Software


Pkg Code Details Quantities Dimensions PDF
  • JEDEC Reference: MS-018
  • MSL Pb-Free: L1 @ 260ºC
  • MSL SnPb Eutectic: n/a
  • ThetaJA: 38.0ºC/W
  • Bulk Pack Style: Tube
  • Quantity per Bulk Pack: n/a
  • Quantity per Reel: 500
  • Quantity per Tube: 27
  • Quantity per Tray: n/a
  • Reel Size (Dia. x Width x Pitch): 330 x 32 x 24
  • Tape & Reel Unit Orientation: Pin 1 at sprocket hole.
  • Dimensions: inch
  • Length: 0.653
  • Width: 0.653
  • Thickness: 0.152
  • Lead Pitch: 1.27
  • JEDEC Reference: MO-026
  • MSL Pb-Free: L3 @ 260ºC
  • MSL SnPb Eutectic: n/a
  • ThetaJA: 59.0ºC/W
  • Bulk Pack Style: Tray
  • Quantity per Bulk Pack: n/a
  • Quantity per Reel: 1500
  • Quantity per Tube: n/a
  • Quantity per Tray: 250
  • Reel Size (Dia. x Width x Pitch): 330 x 16 x 12
  • Tape & Reel Unit Orientation: Pin 1 at sprocket hole.
  • Dimensions: mm
  • Length: 7.0
  • Width: 7.0
  • Thickness: 1.0
  • Lead Pitch: 0.5

Parts & Purchasing

Part Number Pkg Code RoHS Min Temp Max Temp Status Buy Now Order Samples
XR16C850CJ-F PLCC44 0 70 Active
XR16C850CJTR-F PLCC44 0 70 OBS Suggested:
XR16C850CM-F TQFP48 0 70 Active
XR16C850CMTR-F TQFP48 0 70 OBS Suggested:
XR16C850IJ-F PLCC44 -40 85 EOL Suggested:
XR16C850IJTR-F PLCC44 -40 85 EOL Suggested:
XR16C850IM-F TQFP48 -40 85 Active
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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.
Distribution Date Description File
07/12/2017 Product Discontinuation Notice PDN_17-0626-01-1033.pdf
08/17/2016 Qualification of ANST as an alternate manufacturing site. PCN 16-0417-02 ANST-1033.pdf
07/26/2016 Product discontinuation notification. Discontinued. PDN 16-0626-01-1033.pdf
11/05/2015 Updated information subsequent to original published PCN 13-0834-03 on 04/02/2014. ASE Malaysia as alternate assembly site Addition of qualified alternate assembly site of 28, 44, 68L PLCC packaged products. PCN 13-0834-03A PLCC 28-44-1033.pdf
07/18/2014 Elimination of back mark. Eliminate back mark; consolidate information in top mark. PCN_14-0313-01-1033.pdf
04/02/2014 Qualification of ASE Malaysia for assembly of 28, 44, 68L PLCC packaged products. Alternate assembly site. PCN_13-0834-03-1033.pdf
10/03/2013 Addition of an alternate qualified assembly site, ASE Chung-Li (Taiwan). Material change and alternate assembly site. PCN_13-0623-03-1033.pdf
10/17/2012 Exar has qualified Millennium Microtech/Thailand as an alternate assembly supplier for 28, 44 and 68 lead PLCC packages in addition to the existing supplier, Unisem/Indonesia. Capacity enhancement PCN_12-0824-01-1033.pdf