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Exar Corporation

XR16L651 Datasheet Preview

XR16L651 Datasheet

2.25V TO 5.5V UART

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áçwww.DataSheet4U.com
JANUARY 2004
GENERAL DESCRIPTION
The XR16L6511 (651) is a 2.25 to 5.5 volt Universal
Asynchronous Receiver and Transmitter (UART) with
5 volt tolerant inputs. This device supports Intel and
Motorola data bus interfaces and is software
compatible to industry standard 16C450, 16C550,
ST16C580 and ST16C650A UARTs.
The 651 has 32 bytes of TX and RX FIFOs and is
capable of operating up to serial data rates of 3.125
Mbps at 5 volt supply voltage. The internal registers
include the 16C550 register set plus Exar’s enhanced
registers for additional features to support today’s
highly demanding data communication needs. The
enhanced features include automatic hardware and
software flow control, selectable TX and RX trigger
levels, and wireless infrared (IrDA) encoder/decoder.
The device provides a new capability to give user the
ability to program the wireless infrared encoder
output pulse width, hence reducing the power
consumption of a handheld unit.
The XR16L651 device comes in a small 7x7x1mm
48-pin TQFP package in both the commercial and
industrial temperature ranges.
NOTE: 1 Covered by US patents #5,649,122.
XR16L651
2.25V TO 5.5V UART WITH 32-BYTE FIFO
FEATURES
REV. 1.3.0
Added feature in devices with top mark date code of
"C2 YYWW" and newer:
s 0 ns address hold time
2.25 to 5.5 Volt Operation w/ 5 Volt Tolerant Inputs
ST16C450/550/580/650A Software Compatible
Intel, Motorola or PC Mode 8-bit Bus Interface
Up to 3.125 Mbps Data Rate at 5 Volt Operation
32-byte Transmit and Receive FIFOs
Automatic RS485 Half-Duplex Control Output
Automatic Hardware (RTS/CTS) Flow Control
Hardware Flow Control Hysteresis
Automatic Software (Xon/Xoff) Flow Control
Infrared (IrDA) Encoder/Decoder Enable Input
Programmable Infrared Encoder Pulse Width
Sleep Mode with Wake-up Indicator via interrupt
APPLICATIONS
Battery Operated Electronics
Internet Appliances
Handheld Terminal
Personal Digital Assistants
Cellular Phones DataPort
Wireless Infrared Data Communications Systems
FIGURE 1. BLOCK DIAGRAM
RESET
A2:A0
D7:D0
IOR#
IOR
IOW#/R/W#
IOW
CS2#
CS1
CS0
INT
TXRDY#
RDRDY#
DDIS#
ENIR
IM#
PCMODE#
S1
S2
S3
IRQA
IRQB
IRQC
Intel,
Motorola
or PC
Data Bus
Interface
PC Mode:
COM 1 to 4
Decode Logic
UART
Configuration
Regs
BRG
Prescaler
32 Byte TX FIFO
Transmitter
Infrared Encoder and
Pulse Width Control
CTS Flow
Control
Modem Control Signals
RTS Flow
Control
Infrared
Decoder
Receiver with Auto
Software Flow Control
32 Byte RX FIFO
Baud Rate Generator
Crystal Osc/Buffer
TX
DTR#, DSR#,
RTS#, CTS#,
CD#, RI#
RX
XTAL1/CLK
XTAL2
Exar Corporation 48720 Kato Road, Fremont CA, 94538 (510) 668-7000 FAX (510) 668-7017 www.exar.com




Exar Corporation

XR16L651 Datasheet Preview

XR16L651 Datasheet

2.25V TO 5.5V UART

No Preview Available !

XR16L651
2.25V TO 5.5V UART WITH 32-BYTE FIFO
FIGURE 2. INTEL, MOTOROLA AND PC MODE PIN OUT
áç
REV. 1.3.0
GND
A9
CTS#
DSR#
CD#
RI#
VCC
D0
D1
D2
D3
D4
36 35 34 33 32 31 30 29 28 27 26 25
XR16L651
48-TQFP
in Intel Bus Mode
1 2 3 4 5 6 7 8 9 10 11 12
AS#
TXRDY#
DDIS#
S1
IOR
IOR#
GND
IOW
IOW#
XTAL2
XTAL1
ENIR
VCC
A9
CTS#
DSR#
CD#
RI#
VCC
D0
D1
D2
D3
D4
36 35 34 33 32 31 30 29 28 27 26 25
XR16L651
48-TQFP in
Motorola Bus Mode
1 2 3 4 5 6 7 8 9 10 11 12
AS#
TXRDY#
DDIS#
S1
GND
GND
GND
GND
R/W#
XTAL2
XTAL1
ENIR
Intel Bus Mode with
IM# tied to GND and
PCMODE# tied to VCC
Motorola Bus Mode with
IM# tied to VCC and
PCMODE# tied to VCC
GND
A9
CTS#
DSR#
CD#
RI#
VCC
D0
D1
D2
D3
D4
36 35 34 33 32 31 30 29 28 27 26 25
XR16L651
48-TQFP
in PC Mode
1 2 3 4 5 6 7 8 9 10 11 12
AEN#
IRQC
LPT2#
S1
A3
IOR#
GND
A8
IOW#
XTAL2
XTAL1
ENIR
PC Mode with IM# and
PCMODE# tied to GND
IM# : PIN 37
PCMODE# : PIN 36
ORDERING INFORMATION
PART NUMBER
PACKAGE
XR16L651CM
48-Lead TQFP
XR16L651IM
48-Lead TQFP
OPERATING TEMPERATURE RANGE
0°C to +70°C
-40°C to +85°C
DEVICE STATUS
Active
Active
2


Part Number XR16L651
Description 2.25V TO 5.5V UART
Maker Exar Corporation
Total Page 30 Pages
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