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Manufacturer Part #


ST16C650A Series 3.125 Mbps 5.5 V SMT UART With 32-Byte FIFO - TQFP-48

ECAD Model:
Mfr. Name: MaxLinear
Standard Pkg:
Product Variant Information section
Date Code: 1903
Product Specification Section
MaxLinear ST16C650AIQ48-F - Technical Attributes
Attributes Table
Data Rate: 3.125Mbps
No of Functions / Channels: 1
Interface Type: Parallel
Supply Voltage-Nom: 2.9V to 5.5V
Supply Current: 3mA
Power Dissipation: 0.5W
Clock Frequency-Max: 50MHz
Operating Temperature: -40°C to +85°C
Storage Temperature Range: -65°C to +150°C
Package Style:  TQFP-48
Mounting Method: Surface Mount
Features & Applications

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.


  • 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
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Product Variant Information section