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ST16C2550

2.97V TO 5.5V DUART WITH 16-BYTE FIFO

Exar Corporation 

xr

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. The C2550 provides enhanced UART

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

• Portable Appliances

• Telecommunication Network Routers

• Ethernet Network Routers

• Cellular Data Devices

• Factory Automation and Process Controls

ST16C2550

2.97V TO 5.5V DUART WITH 16-BYTE FIFO

FEATURES

REV. 4.4.0

Added feature in devices with top mark date code

of "A2 YYWW" and newer:

■ 5 Volt Tolerant Inputs

• Pin-to-pin compatible to Exar’s ST16C2450,

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

■ 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

• Crystal oscillator or external clock input

• 48-TQFP and 44-PLCC packages

FIGURE 1. ST16C2550 BLOCK DIAGRAM

A2:A0

D7:D0

IOR#

IOW#

CSA#

CSB#

INTA

INTB

TXRDYA#

TXRDYB#

RXRDYA#

RDRXYB#

Reset

8-bit Data

Bus

Interface

UART Channel A

UART

Regs

BRG

16 Byte TX FIFO

TX & RX

16 Byte RX FIFO

UART Channel B

(same as Channel A)

Crystal Osc/Buffer

2.97V to 5.5V

GND

TXA, RXA, DTRA#,

DSRA#, RTSA#,

DTSA#, CDA#, RIA#,

OP2A#

TXB, RXB, DTRB#,

DSRB#, RTSB#,

CTSB#, CDB#, RIB#,

OP2B#

XTAL1

XTAL2

Exar Corporation 48720 Kato Road, Fremont CA, 94538 • (510) 668-7000 • FAX (510) 668-7017 • www.exar.com

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