1.62V to 3.63V Single UART with 32-Byte FIFO

  • Pin-to-pin compatible with XR16L570
  • Intel Data Bus Interface select
  • Single independent UART channel
  • Register Set Compatible to 16C550
  • Data rates of up to 16 Mbps at 3.3V
  • 32 Byte Transmit FIFO
  • 32 Byte Receive FIFO with error tags
  • 4 Selectable TX and RX FIFO Trigger Levels
  • Automatic Hardware (RTS/CTS) Flow Control
  • Automatic Software (Xon/Xoff) Flow Control
  • Programmable Xon/Xoff characters
  • Wireless Infrared (IrDA 1.0 & 1.1) Encoder/Decoder
  • Full modem interface
  • 1.62V to 3.63V supply operation
  • Sleep Mode with automatic wake-up
  • Crystal oscillator or external clock input
  • Pb-Free, RoHS Compliant Versions Offered

  • Portable Appliances
  • Telecommunication Network Routers
  • Ethernet Network Routers
  • Cellular Data Devices
  • Factory Automation and Process Controls

The XR16M670¹ (M670) is an enhanced quad Universal Asynchronous Receiver and Transmitter (UART) each with 32 bytes of transmit and receive FIFOs, programmable transmit and receive FIFO trigger levels, automatic hardware and software flow control, and data rates of up to 16 Mbps at 4X sampling rate. Each UART has a set of registers that provide the user with operating status and control, receiver error indications, and modem serial interface controls. An internal loopback capability allows onboard diagnostics. The M670 is available in a 24-pin QFN, 32-pin QFN and 25-pin BGA packages. The M670 packages only offer the 16 mode interface. The XR16M670 is compatible with the industry standard XR16L570.

¹Covered by U.S. 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
StatusBuy NowOrder Samples

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. 
CPU InterfaceIntel
Max Data Rate @ 5/3.3/2.5/1.8V (Mbps)na/16/12.5/7.5
Tx/Rx FIFO (Bytes)32/32
Tx/Rx FIFO CtrsYes
Tx/Rx FIFO INT Trig4 Levels / 4 Levels
IrDa SupYes
5V Tol InputsNo
Sup V1.62-3.63
PkgsQFN-24, QFN-32, BGA-25
Data Rate @ 5/3.3/2.5Vna/16/12.5