ST16C2550IJ44 Exar Corporation, ST16C2550IJ44 Datasheet

ST16C2550IJ44

Manufacturer Part Number

ST16C2550IJ44

Description

PLCC44

Manufacturer

Exar Corporation

Datasheet

1.ST16C2550IJ44.pdf (39 pages)

Specifications of ST16C2550IJ44

Date_code

07+

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OCTOBER 2004

GENERAL DESCRIPTION

The ST16C2550 (C2550) is a dual universal

asynchronous receiver and transmitter (UART). The

ST16C2550 is an improved version of the PC16550

UART with higher operating speed and faster access

times.

functions with 16 byte FIFO’s, a modem control

interface, and data rates up to 4 Mbps. Onboard

status registers provide the user with error indications

and operational status. System interrupts and modem

control features may be tailored by external software

to meet specific user requirements. Independent

programmable baud rate generators are provided to

select transmit and receive clock rates from 50 bps to

4 Mbps. The Baud Rate Generator can be configured

for either crystal or external clock input. An internal

loopback capability allows onboard diagnostics. The

C2550 is available in a 44-pin PLCC and 48-pin

TQFP packages. The C2550 is fabricated in an

advanced CMOS process capable of operating from

2.97 volt to 5.5 volt power supply.

APPLICATIONS

•

Exar

Portable Appliances

Telecommunication Network Routers

Ethernet Network Routers

Cellular Data Devices

Factory Automation and Process Controls

IGURE

RXRDYA#

RDRXYB#

TXRDYA#

TXRDYB#

Corporation 48720 Kato Road, Fremont CA, 94538

D7:D0

A2:A0

CSA#

CSB#

Reset

IOW#

IOR#

INTA

INTB

The

1. ST16C2550 B

C2550

provides

LOCK

8-bit Data

Interface

Bus

IAGRAM

enhanced

UART

•

(510) 668-7000

UART

BRG

Regs

FEATURES

Added feature in devices with top mark date code

of "A2 YYWW" and newer:

•

(same as Channel A)

Crystal Osc/Buffer

Pin-to-pin

XR16L2550 and XR16L2750

Pin-to-pin compatible to TI’s TL16C752B on the 48-

TQFP package

Pin alike XR16C2850 48-TQFP package but

without CLK8/16, CLKSEL and HDCNTL inputs

2 independent UART channels

Crystal oscillator or external clock input

48-TQFP and 44-PLCC packages

2.97V TO 5.5V DUART WITH 16-BYTE FIFO

UART Channel B

UART Channel A

■

5 Volt Tolerant Inputs

Up to 4 Mbps with external clock of 64 MHz

Up to 1.5 Mbps data rate with a 24 MHz crystal

frequency

16 byte Transmit FIFO to reduce the bandwidth

requirement of the external CPU

16 byte Receive FIFO with error tags to reduce

the bandwidth requirement of the external CPU

4 selectable Receive FIFO interrupt trigger

levels

Modem control signals (CTS#, RTS#, DSR#,

DTR#, RI#, CD#)

Programmable character lengths (5, 6, 7, 8)

with even, odd, or no parity

16 Byte TX FIFO

16 Byte RX FIFO

TX & RX

•

FAX (510) 668-7017

compatible

•

2.97V to 5.5V

GND

Exar’s

OP2A#

OP2B#

XTAL1

XTAL2

DSRA#, RTSA#,

DSRB#, RTSB#,

TXA, RXA, DTRA#,

TXB, RXB, DTRB#,

DTSA#, CDA#, RIA#,

CTSB#, CDB#, RIB#,

www.exar.com

ST16C2450,

REV. 4.4.0

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