ST16C650A
UART with 32-Byte FIFOs and Infrared (IrDA) Encoder/Decoder

Features

  • Pin to pin and functionally compatible to the Industry Standard 16550
  • 1.5 Mbps transmit/receive operation (24MHz)
  • 32 byte transmit FIFO
  • 32 byte receive FIFO with error flags
  • Automatic hardware/software flow control
  • Programmable Xon/Xoff characters
  • Independent transmit and receive control
  • Software selectable Baud Rate Generator pre-scaleable clock rates of 1X or 4X
  • Four selectable transmit/receive FIFO interrupt trigger levels
  • Standard modem interface or Infrared IrDA encode/decoder interface
  • STD mode compatible with ST16C450/550
  • PC mode provides PC ISA bus COM and LPT port address decoding
  • Sleep mode ( 800mA stand-by )
  • Low operating current ( 1.3mA typ.)
  • Pb-Free, RoHS Compliant Versions Offered
Applications

  • Battery Operated Electronics
  • Internet Appliances
  • Handheld Terminal
  • Personal Digital Assistants
  • Cellular Phones DataPort
Description
The ST16C650A1 is a universal asynchronous receiver and transmitter (UART) and is pin compatible with the ST16C550 UART. The 650A is an enhanced UART with 32 byte FIFO’s, automatic hardware/software flow control, and data rates up to 1.5Mbps. 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 650A is available in 40 pin PDIP, 44 pin PLCC, and 48 pin TQFP packages. The 40 pin package does not offer the PC mode. The 44 and 48 pin versions provide 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.

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

 

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

 
Part NumberPkg CodeRoHSMin
Temp.
(°C)		Max
Temp.
(°C)		StatusBuy NowOrder Samples
ST16C650ACJ44-FPLCC-44PLCC-44070Active
ST16C650ACQ48-FTQFP-48TQFP-48070Active
ST16C650AIJ44-FPLCC-44PLCC-44-4085Active
ST16C650AIQ48-FTQFP-48TQFP-48-4085Active

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. 
Specifications
CH1
CPUInterfaceIntel or PC COM Port
Data Rate@5/3.3/2.5V3.1/2.0/na
Tx/RxFIFO(Bytes)32/32
Tx/RxFIFOCtrsNo
Tx/RxFIFOINT Trig4 Levels/ 4 Levels
AutoRTS/CTSYes
IrDaSupYes
5VTolInputsYes
Sup V2.97-5.5
PkgsPLCC-44, TQFP-48
Documents
Software Drivers
Windows 95 & 98 Drivers
Version 1.0.0.0
December 2009
105.18 KB
Linux 2.4 Drivers
Version 1.0
December 2009
907.57 KB
Windows NT Drivers
Version 1.0.0.0
December 2009
663.44 KB
Datasheets
Datasheet
Version 5.0.3
June 2010
1.08 MB
Application Notes
DAN-107, Interfacing 16Cxxx UARTs to a CPU
Version 1.0.0
August 1999
32.43 KB
DAN-108, UART Crystal Oscillator Design Guide
Version 1.0.0
March 2000
58.16 KB
DAN-102, Infrared Application with ST16C580, ST16C650A or XR16C850 UART
Version 1.0.0
October 2007
39.82 KB
DAN-132, EXAR's ST16C550 vs. TL16C550C
Version 1.0.0
June 2002
121.52 KB
DAN-131, EXAR's ST16C650A vs. TL16C750
Version 1.1.0
June 2002
81.51 KB
AN-650, ST16C650 Application Example
Version 1.0.0
May 1999
42.30 KB
General UART Application Note
Version 1.0.0
December 1996
39.81 KB
DAN-190, Exar UARTs in RS-485 Applications
Version 1.0.0
April 2008
147.31 KB
AN-204, UART Sleep Mode
Version 1.0.0
June 2010
511.72 KB
Schematics
ISA Eval Board Schematic
Version 1.4.0
August 2007
77.56 KB
Manuals
Evaluation Board User's Manual
Version 1.3.0
July 2003
29.52 KB