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XR16C850CQ Datasheet

  • XR16C850CQ

  • UART with 128-byte FIFO’s FIFO Counters and Half-duplex Con...

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  • 55頁

  • EXAR   EXAR

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XR16C850
UART with 128-byte FIFO鈥檚
FIFO Counters and Half-duplex Control
June 1999-1
GENERAL DESCRIPTION
The XR16C850
*1
(850) is a universal asynchronous
receiver and transmitter (UART) and is pin compatible
with the ST16C550,ST16C650A, and TI鈥檚 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.
D4
D3
PLCC Package
-DSR
41
-CTS
40
39
38
37
36
35
VCC
N.C.
-CD
42
-RI
43
D2
D1
D0
D5
D6
D7
RCLK
RX
N.C.
TX
CS0
CS1
-CS2
-BAUDOUT
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
44
6
5
4
3
2
1
RESET
-OP1
-DTR
-RTS
-OP2
N.C.
INT
-RXRDY
A0
A1
A2
XR16C850CJ
"STD" MODE
CONNECTION
34
33
32
31
30
29
IOW
GND
IOR
-DDIS
-DSR
41
-TXRDY
XTAL1
XTAL2
-IOW
-IOR
N.C.
44
43
42
鈥?/div>
Pin to pin compatible to ST16C550, ST16C650A and
TL16C750
鈥?/div>
Transmit/receive FIFO counters
鈥?/div>
128 bytes of Transmit/Receive FIFO
鈥?/div>
RS-485 half duplex direction control
鈥?/div>
Automatic software/hardware flow control
鈥?/div>
Programmable, selectable transmit/receive trigger
levels
鈥?/div>
Infrared transmitter and receiver encoder/decoder
鈥?/div>
Up to 1.5Mbps data rate
鈥?/div>
Sleep mode (100碌A(chǔ) standby)
鈥?/div>
Small 7x7mm TQFP
鈥?/div>
+5 or 3.3 Volts operation
鈥?/div>
Windows
2
drivers available
40
39
38
37
36
FEATURES
D5
D6
D7
S2
RX
A4
TX
A5
A6
A7
-LPT1
7
8
9
10
11
12
13
14
15
16
17
6
5
4
3
2
1
-CTS
VCC
-CD
-RI
D4
D3
D2
D1
D0
A9
-AS
RESET
-OP1
-DTR
-RTS
S3
GND
IRQA
IRQB
A0
A1
A2
XR16C850CJ
"PC" MODE
CONNECTION
35
34
33
32
31
30
29
18
19
20
21
22
23
24
25
26
27
IRQC
-IOW
XTAL1
XTAL2
-IOR
A8
S1
A3
ORDERING INFORMATION
Part Number
Pins
Package Operating Temperature
Part Number
Pins
Package Operating Temperature
XR16C850CP
XR16C850CJ
XR16C850CM
XR16C850CQ
40
44
48
52
PDIP
PLCC
TQFP
QFP
0擄 C to + 70擄 C
0擄 C to + 70擄 C
0擄 C to + 70擄 C
0擄 C to + 70擄 C
XR16C850IP
XR16C850IJ
XR16C850IM
XR16C850IQ
40
44
48
52
PDIP
PLCC
TQFP
QFP
-40擄 C to + 85擄 C
-40擄 C to + 85擄 C
-40擄 C to + 85擄 C
-40擄 C to + 85擄 C
Note *1: Covered by U.S. patent # 5,649,122 and patent pending.
Note *2: Windows is a trademark of Microsoft Corporation.
Rev. 1.20
EXAR
Corporation, 48720 Kato Road, Fremont, CA 94538
鈥?/div>
(510) 668-7000
鈥?/div>
FAX (510) 668-7017
-LPT2
-AEN
GND
28

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