XR16C850 Datasheet, PDF (1/55 Pages) Exar Corporation – UART with 128-byte FIFO’s FIFO Counters and Half-duplex Control

XR16C850
UART with 128-byte FIFO’s
FIFO Counters and Half-duplex Control
GENERAL DESCRIPTION
The XR16C850^*1 (850) is a universal asynchronous
receiver and transmitter (UART) and is pin compatible
with the ST16C550,ST16C650A, and TI’s TL16C750
UART. The 850 is an enhanced UART with 128 byte
FIFOs, automatic hardware/software flow control, and
data rates up to 1.5Mbps. It includes transmit/receive
FIFO counters to increase data loading and unloading
throughput. Onboard status registers provide error indi-
cations and operational status. Modem interface con-
trol is included and can be optionally configured to
operate with the Infrared (IrDA) encoder/decoder. Inter-
nal loopback allows onboard diagnostics. The 850 is
available in 40-pin PDIP, 44-pin PLCC, 48-pin TQFP,
and 52-pin QFP packages. The 44, 48, and 52 pin
versions provide both the standard (STD) mode or PC
mode. The STD mode is compatible with the ST16C450,
ST16C550, ST16C650A and TL16C750 while the PC
mode supports standard PC COM port connections.
The 40 PDIP pin package does not offer the PC mode.
D5 7
D6 8
D7 9
RCLK 10
RX 11
N.C. 12
TX 13
CS0 14
CS1 15
-CS2 16
-BAUDOUT 17
PLCC Package
June 1999-1
XR16C850CJ
"STD" MODE
CONNECTION
39 RESET
38 -OP1
37 -DTR
36 -RTS
35 -OP2
34 N.C.
33 INT
32 -RXRDY
31 A0
30 A1
29 A2
FEATURES
• Pin to pin compatible to ST16C550, ST16C650A and
TL16C750
• Transmit/receive FIFO counters
• 128 bytes of Transmit/Receive FIFO
• RS-485 half duplex direction control
• Automatic software/hardware flow control
• Programmable, selectable transmit/receive trigger
levels
• Infrared transmitter and receiver encoder/decoder
• Up to 1.5Mbps data rate
• Sleep mode (100µA standby)
• Small 7x7mm TQFP
• +5 or 3.3 Volts operation
• Windows² drivers available
D5 7
D6 8
D7 9
S2 10
RX 11
A4 12
TX 13
A5 14
A6 15
A7 16
-LPT1 17
XR16C850CJ
"PC" MODE
CONNECTION
39 RESET
38 -OP1
37 -DTR
36 -RTS
35 S3
34 GND
33 IRQA
32 IRQB
31 A0
30 A1
29 A2
ORDERING INFORMATION
Part Number Pins Package Operating Temperature
XR16C850CP 40 PDIP
0° C to + 70° C
XR16C850CJ 44 PLCC
0° C to + 70° C
XR16C850CM 48 TQFP
0° C to + 70° C
XR16C850CQ 52 QFP
0° C to + 70° C
Note *1: Covered by U.S. patent # 5,649,122 and patent pending.
Note *2: Windows is a trademark of Microsoft Corporation.
Part Number
XR16C850IP
XR16C850IJ
XR16C850IM
XR16C850IQ
Pins
40
44
48
52
Package Operating Temperature
PDIP
-40° C to + 85° C
PLCC
-40° C to + 85° C
TQFP
-40° C to + 85° C
QFP
-40° C to + 85° C
Rev. 1.20
EXAR Corporation, 48720 Kato Road, Fremont, CA 94538 • [phone] • FAX [phone]