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XR16V2751_0709 PDF预览

XR16V2751_0709

更新时间: 2024-11-22 07:07:23
品牌 Logo 应用领域
艾科嘉 - EXAR 先进先出芯片
页数 文件大小 规格书
52页 1097K
描述
HIGH PERFORMANCE DUART WITH 64-BYTE FIFO AND POWERSAVE

XR16V2751_0709 数据手册

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XR16V2751  
HIGH PERFORMANCE DUART WITH 64-BYTE FIFO AND POWERSAVE  
SEPTEMBER 2007  
REV. 1.0.1  
FEATURES  
GENERAL DESCRIPTION  
2.25 to 3.6 Volt Operation  
5 Volt Tolerant Inputs  
1
The XR16V2751 (V2751) is a high performance dual  
universal asynchronous receiver and transmitter  
(UART) with 64 byte TX and RX FIFOs. The device  
operates from 2.25 to 3.6 volts with 5 Volt tolerant  
inputs and is pin-to-pin and software compatible to  
Exar’s XR16L2751. The device includes 2 additional  
capabilities over the XR16V2750: Intel and Motorola  
data bus selection and a “PowerSave” mode to  
further reduce sleep current to a minimum during  
sleep mode. It supports the Exar’s enhanced features  
of programmable FIFO trigger level and FIFO level  
counters, automatic hardware (RTS/CTS) and  
software flow control, automatic RS-485 half duplex  
direction control output and a complete modem  
interface. An internal loopback capability allows  
system diagnostics. Independent programmable  
fractional baud rate generators are provided in each  
channel to select data rates up to 8 Mbps at 3.3 Volt  
and 8X sampling clock. The V2751 is available in a  
48-pin TQFP package.  
Pin-to-pin compatible to Exar’s XR16L2751 in the  
48-TQFP package  
Two independent UART channels  
Register set identical to 16L2751  
Data rate of up to 8 Mbps at 3.3 V, and  
6.25 Mbps at 2.5 V with 8X sampling rate  
Fractional Baud Rate Generator  
Transmit and Receive FIFOs of 64 bytes  
Programmable TX and RX FIFO Trigger Levels  
Transmit and Receive FIFO Level Counters  
Automatic Hardware (RTS/CTS) Flow Control  
Selectable Auto RTS Flow Control Hysteresis  
Automatic Software (Xon/Xoff) Flow Control  
Automatic RS-485 Half-duplex Direction  
Control Output via RTS#  
Wireless Infrared (IrDA 1.0) Encoder/Decoder  
Automatic sleep mode with wake-up interrupt  
Full modem interface  
N
OTE: 1 Covered by U.S. Patent #5,649,122 and #5,949,787  
APPLICATIONS  
PowerSave Feature reduces sleep current to 15  
µA  
Portable Appliances  
Telecommunication Network Routers  
Ethernet Network Routers  
Device Identification and Revision  
Crystal oscillator (up to 24MHz) or external clock  
(up to 64MHz) input  
Cellular Data Devices  
Factory Automation and Process Controls  
48-TQFP package  
F
IGURE 1. XR16V2751 BLOCK DIAGRAM  
*5 Volt Tolerant Inputs  
(Except XTAL1)  
2.25 to 3.6V VCC  
GND  
PwrSave  
A2:A0  
D7:D0  
UART Channel A  
64 Byte TX FIFO  
IOR# (VCC)  
IOW# (R/W#)  
TXA, RXA, DTRA#,  
DSRA#, RTSA#,  
DTSA#, CDA#, RIA#,  
OP2A#  
UART  
CSA# (CS#)  
CSB# (A3)  
Regs  
IR  
ENDEC  
TX & RX  
BRG  
INTA (IRQ#)  
INTB (logic 0)  
64 Byte RX FIFO  
TXB, RXB, DTRB#,  
DSRB#, RTSB#,  
CTSB#, CDB#, RIB#,  
OP2B#  
TXRDYA#  
TXRDYB#  
RXRDYA#  
RXRDYB#  
Intel or  
Motorola  
Data Bus  
Interface  
UART Channel B  
(same as Channel A)  
XTAL1  
XTAL2  
Reset (Reset#)  
16/68#  
Crystal Osc/Buffer  
CLKSEL  
HDCNTL#  
Exar Corporation 48720 Kato Road, Fremont CA, 94538 (510) 668-7000 FAX (510) 668-7017 www.exar.com  

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