ST16C450
UNIVERSAL ASYNCHRONOUS
RECEIVER/TRANSMITTER (UART)
September 2003
GENERAL DESCRIPTION
The ST16C450 is a universal asynchronous receiver
and transmitter. The ST16C450 is an improved ver-
sion of the NS16450 UART with higher operating
speed and lower access time. A programmable baud
rate generator is provided to select transmit and
receive clock rates from 50 Bps to 1.5 Mbps.
The ST16C450 on board status registers provides the
error conditions, type and status of the transfer
operation being performed. Included is complete
MODEM control capability, and a processor interrupt
system that may be software tailored to the user’s
requirements. The ST16C450 provides internal loop-
back capability for on board diagnostic testing.
The ST16C450 is available in 40 pin PDIP, 44 pin
PLCC, and 48 pin TQFP packages. It is fabricated in
an advanced CMOS process to achieve low drain
power and high speed requirements.
PLCC Package
-DSR
41
-CTS
40
39
38
37
36
35
VCC
N.C.
-CD
42
-RI
43
D4
D3
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
N.C.
A0
A1
A2
ST16C450CJ44
34
33
32
31
30
29
XTAL1
XTAL2
-IOW
-IOR
-DDIS
IOW
N.C.
FEATURES
•
Pin to pin and functionally compatible to the Indus-
try Standard 16450
•
2.97 to 5.5 volt operation
•
1.5 Mbps transmit/receive operation (24MHz)
•
Programmable word lengths (5, 6, 7, 8)
•
Even, odd, force, or no parity generation and
detection
•
Independent transmit and receive control
•
Standard modem interface
•
Low operating current ( 1.2mA typ.)
ORDERING INFORMATION
Part number
Package
Operating temperature
Device Status
ST16C450CP40
ST16C450CJ44
ST16C450CQ48
ST16C450IP40
ST16C450IJ44
ST16C450IQ48
40-Lead
44-Lead
48-Lead
40-Lead
44-Lead
48-Lead
PDIP
PLCC
TQFP
PDIP
PLCC
TQFP
0° C to + 70° C
0° C to + 70° C
0° C to + 70° C
-40° C to + 85° C
-40° C to + 85° C
-40° C to + 85° C
Active. See the ST16C450CQ48 for new designs.
Active
Active
Active. See the ST16C450IQ48 for new designs.
Active
Active
Rev. 4.20
EXAR
Corporation, 48720 Kato Road, Fremont, CA 94538
•
(510) 668-7000
•
FAX (510) 668-7017
CSOUT
GND
IOR
-AS
EXAR [ EXAR CORPORATION ]
