XR16L570 Datasheet, PDF (1/46 Pages) Exar Corporation – SMALLEST 1.62V TO 5.5V UART WITH 16-BYTE FIFO AND POWERSAVE

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XR16L570
SMALLEST 1.62V TO 5.5V UART WITH 16-BYTE FIFO AND POWERSAVE
DECEMBER 2005
GENERAL DESCRIPTION
FEATURES
REV. 1.0.0
The XR16L570 (L570) is a 1.62 to 5.5 volt Universal
Asynchronous Receiver and Transmitter (UART) with 5 volt
tolerant inputs and a reduced pin count. It is software
compatible to industry standard 16C450, 16C550,
ST16C580, ST16C650A, XR16C850 and XR16L580
UARTs. It has 16 bytes of TX and RX FIFOs and is capable
of operating with a serial data rate of up to 4 Mbps at 5V, 3
Mbps at 3.3V,1 Mbps at 2.5V and 750 Kbps at 1.8V. The
internal registers are compatible to the 16C550 register set
plus enhanced registers for additional features to support
today’s high bandwidth data communication needs. The
enhanced features include automatic hardware and
software flow control to prevent data loss, selectable RX
and TX trigger levels for more efficient interrupt service,
wireless infrared (IrDA) encoder/decoder for wireless
applications and a unique Power-Save mode to increase
battery operating time. The device comes in 32-QFN and
24-QFN packages in industrial temperature range.
APPLICATIONS
• Handheld Terminals and Tablets
• Handheld Computers
• Wireless Portable Point-of-Sale Terminals
• Cellular Phones DataPort
• GPS Devices
• Personal Digital Assistants Modules
• Battery Operated Instruments
• Smallest Full Featured UART
• 1.62V to 5.5V Supply Voltage
• 5V Tolerant Inputs (except XTAL1/CLK)
• ’0 ns’ Address Hold Time (T_AH and T_ADH)
• Software Compatible to industry standard 16C450,
16C550, ST16C580, ST16C650A, XR16C850 and
XR16L580
• 16-byte Transmit FIFO
• 16-byte Receive FIFO with Errors Flags
• Selectable RX and TX FIFO Trigger Levels
• Automatic Hardware (RTS/CTS) Flow Control
• Automatic Software (Xon/Xoff) Flow Control
• Up to 4 Mbps data rate at 5.0V Operation
• Up to 3 Mbps data rate at 3.3V Operation
• Up to 1 Mbps data rate at 2.5V Operation
• Up to 750 Kbps data rate at 1.8V Operation
• Infrared (IrDA) Encoder/Decoder
• Complete Modem Interface
• Power-Save Mode to conserve battery power
• Sleep Mode with Wake-up Interrupt
• Very small packages: 24-QFN (4x4x0.9mm) and 32-QFN
(5x5x0.9mm)
• Industrial Temperature Grade(-40 to +85^oC)
FIGURE 1. BLOCK DIAGRAM
PwrSave
A2:A0
D7:D0
IOR#
IOW#
CS#
INT
RESET
Data Bus
Interface
*5 V Tolerant Inputs
(Except for CLK)
UART
UART ^{16 Byte TX FIFO}
Regs
TX & RX
IR
ENDEC
BRG 16 Byte RX FIFO
Clock Buffer
VCC
(1.62 to 5.5 V)
GND
TX
RX
RTS#
CTS#
DTR#
DSR#
CD#
RI#
XTAL1 (CLK)
XTAL2
Exar Corporation 48720 Kato Road, Fremont CA, 94538 • [phone] • FAX [phone] • www.exar.com