XR16L570
Smallest 1.62V to 5.5V UART with 16-Byte FIFO and Power-Save
Full Featured Low Voltage UART in 24 and 32-QFN
Packages with Automatic Hardware/Software Flow
Control and a Unique Power-Save Mode
T
he XR16L570 (L570) Universal Asynchronous Receiver
Transmitter (UART) can be designed into a wide array of
industrial, telecommunications and consumer applications.
The L570 is designed for space limited applications such as
cellular phones, digital cameras, global positioning systems, and
other battery operated portable consumer products. The device is
available in small form factors of 24 and 32-pin QFN packages.
The L570 consists of 16-byte Transmit (TX) and Receive (RX)
FIFOs with selectable trigger levels. The automatic hardware and
software flow control features maximize data throughput and
reduce CPU bandwidth requirements. The device has a Power-Save
mode that reduces sleep current to less than 30 uA. The XR16L570
operates at a wide voltage range of 1.62V to 5.5V.
The device supports data rates up to 4Mbps at 5V, 3Mbps at 3.3V,
1Mbps at 2.5V, and 750 Kbps at 1.8V over the industrial
temperature range (-40ºC to +85ºC).
Compatibility
The XR16L570 is software compatible to the ST16C450,
ST16C550, ST16C580, ST16C650A and XR16C850 UARTs.
Major Features
• Smallest form factor single
channel UART
• 1.62V to 5.5V supply voltage
range
• Up to 4Mbps serial data rate
• Less than 30uA Power-Save
current
• 16-byte TX and RX FIFOs
• Automatic software and
hardware flow control
Ordering Information
Product No.
Package
Operating Temp. Range
XR16L570IL24
24-QFN
-40ºC to +85ºC
XR16L570IL32
32-QFN
-40ºC to +85ºC
• Power saving features for
longer battery life
XR16L570
Smallest 1.62V to 5.5V UART with 16-Byte FIFO and Power-Save
XR16L570 Block Diagram
Features
• Small 24-QFN (4mm x 4mm) and
32-QFN (5mm x 5mm) packages
• Up to 4Mbps serial data rate
• Wide operating voltage range of 1.62V
to 5.5V
Applications
• Portable consumer products
• Handheld navigation and Global
Positioning Systems
• Battery operated equipment and
instruments
• 5V tolerant inputs
• Personal Digital Assistants
• IrDA encoder and decoder
• Wireless Point-of-Sale terminals
• Sleep and Power-Save modes
• Cellular phones data port
• Automatic hardware (RTS/CTS) flow
control
• Handheld computers
• Automatic software (Xon/Xoff) flow
control
• 16-byte TX and RX FIFO
• Selectable FIFO trigger levels
FLY0506_XR16L570
©2006 Exar Corporation
Exar Corporation • 48720 Kato Road • Fremont, CA 94538 • 510.668.7000 • fax 510.668.7001 • www.exar.com