参数资料
型号: XR16L2551ILTR-F
厂商: Exar Corporation
文件页数: 1/49页
文件大小: 0K
描述: IC UART FIFO 16B DUAL 32QFN
标准包装: 3,000
特点: *
通道数: 2,DUART
FIFO's: 16 字节
规程: RS232,RS485
电源电压: 2.25 V ~ 5.5 V
带自动流量控制功能:
带IrDA 编码器/解码器:
带故障启动位检测功能:
带调制解调器控制功能:
带CMOS:
安装类型: 表面贴装
封装/外壳: 32-VFQFN 裸露焊盘
供应商设备封装: 32-QFN 裸露焊盘(5x5)
包装: 带卷 (TR)
Exar Corporation 48720 Kato Road, Fremont CA, 94538 (510) 668-7000 FAX (510) 668-7017 www.exar.com
XR16L2551
LOW VOLTAGE DUART WITH POWERSAVE
MAY 2007
REV. 1.1.3
GENERAL DESCRIPTION
The XR16L2551 (L2551) is a low voltage dual
universal asynchronous receiver and transmitter
(UART) with 5 Volt tolerant inputs. The device
includes additional capability over the ST16C2550:
Intel and Motorola data bus interface selection,
hardware and software flow control, infrared encoder/
decoder, sleep mode and a PowerSave mode for
battery operation. The L2551’s enhanced register set
is compatible to the ST16C2550 and XR16L2550. It
supports the Exar’s enhanced features of 16 bytes of
TX and RX FIFOs and a complete modem interface.
Onboard registers provide the user with operational
status and data error tags. An internal loopback
capability allows onboard diagnostics. Independent
programmable baud rate generator is provided in
each channel to support data rates up to 3.125 Mbps.
NOTE: 1 Covered by U.S. Patent #5,649,122.
APPLICATIONS
Battery Operated Instruments
Data Port Adapters
Handheld Appliances
Radio Frequency Data Modems
Base Stations
USB Hubs
Industrial Automation Controls
FEATURES
2.25 to 5.5 Volt Operation
5 Volt Tolerant Inputs
Intel or Motorola Bus Interface Select (16/68#)
pin
Pin-to-pin compatible to XR16L2751CM
Two Independent UARTs
Up to 3.125 Mbps at 5V, 2 Mbps at 3.3V, and 1
Mbps at 2.5V with external clock input
Up to 1.5 Mbps at 5V, 1.25 Mbps at 3.3V and 1
Mbps at 2.5V with crystal clock input
16 bytes of Transmit and Receive FIFOs
Automatic RTS/CTS hardware flow control
Automatic Xon/Xoff software flow control
Wireless infrared encoder/decoder
Receive FIFO trigger levels select
Programmable character lengths (5, 6, 7 or 8)
with even, odd, forced or no parity
Full Modem Interface
(CTS#, RTS#, DSR#,
DTR#, RI#, CD#) in the 48-TQFP package
Sleep Mode with PowerSave feature for battery
operation
Industrial Temperature range
Tiny 32-QFN, no lead package (5x5x0.9mm)
48-TQFP Package
FIGURE 1. XR16L2551 BLOCK DIAGRAM
XTAL1
XTAL2
Crystal Osc/Buffer
TXA, RXA,
RTSA#, CTSA#,
( DTR#, DSR#
CD#, RIA#, OP2A# )
Intel or
Motorola
Data Bus
Interface
UART Channel A
16 Byte TX FIFO
16 Byte RX FIFO
BRG
IR
ENDEC
TX & RX
UART
Regs
2.25 to 5.5 Volt VCC
GND
*5 Volt Tolerant Inputs
2551BLK
UART Channel B
(same as Channel A)
A2:A0
D7:D0
CSA# (CS#)
16/68#
CSB# (A3)
INTA (IRQ#)
INTB (logic 0)
PwrSave
IOW# (R/W#)
IOR# (VCC)
Reset (Reset#)
TXRDYA#
TXRDYB#
RXRDYA#
RXRDYB#
TXB, RXB,
RTSB#, CTSB#,
( DTRB#, DSRB#
CDB#, RIB#, OP2B# )
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