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16C450

UNIVERSAL ASYNCHRONOUS RECEIVER/TRANSMITTER (UART)

Exar Corporation 

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 • (510) 668-7000 • FAX (510) 668-7017

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