ST16C450 Datasheet, PDF (1/28 Pages) Exar Corporation – UNIVERSAL ASYNCHRONOUS RECEIVER/TRANSMITTER (UART)

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.
ST16C450
UNIVERSAL ASYNCHRONOUS
RECEIVER/TRANSMITTER (UART)
September 2003
PLCC Package
D5 7
D6 8
D7 9
RCLK 10
RX 11
N.C. 12
TX 13
CS0 14
CS1 15
-CS2 16
-BAUDOUT 17
ST16C450CJ44
39 RESET
38 -OP1
37 -DTR
36 -RTS
35 -OP2
34 N.C.
33 INT
32 N.C.
31 A0
30 A1
29 A2
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
ST16C450CP40
ST16C450CJ44
ST16C450CQ48
ST16C450IP40
ST16C450IJ44
ST16C450IQ48
Package
40-Lead PDIP
44-Lead PLCC
48-Lead TQFP
40-Lead PDIP
44-Lead PLCC
48-Lead TQFP
Operating temperature
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
Device Status
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 • [phone] • FAX [phone]