ST16C2450CQ48(2003) Просмотр технического описания (PDF) - Exar Corporation

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ST16C2450CQ48
(Rev.:2003)

2.97V TO 5.5V DUART

Exar Corporation 

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SEPTEMBER 2003

GENERAL DESCRIPTION

The ST16C2450 (2450) is a dual universal asynchro-

nous receiver and transmitter (UART). The

ST16C2450 is an improved version of the

ST16C2450 with lower operating voltage and 5 volt

tolerant inputs. The 2450 provides enhanced UART

functions, a modem control interface and data rates

up to 1.5 Mbps. Onboard status registers provide the

user with error indications and operational status. In-

dependent programmable baud rate generators are

provided to select transmit and receive clock rates up

to 1.5 Mbps. An internal loopback capability allows

onboard diagnostics. The 2450 is available in a 44-

pin PLCC and 48-pin TQFP packages. The 2450 is

fabricated in an advanced CMOS process capable of

operating from 2.97 volt to 5.5 volt power supply. The

devices with a top marking of "A2 YYWW" or newer

have 5 volt tolerant inputs.

APPLICATIONS

• Portable Appliances

• Telecommunication Network Routers

• Ethernet Network Routers

• Cellular Data Devices

• Factory Automation and Process Controls

ST16C2450

2.97V TO 5.5V DUART

FEATURES

REV. 4.0.0

Added feature in devices with top marking "A2

YYWW" and newer:

s 5 Volt Tolerant Inputs

• 2.97 to 5.5 Volt Operation

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

ST16C2550, XR16L2550, XR16L2750 and

XR16C2850

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

TQFP package

• 2 independent UART channels

s Up to 1.5 Mbps data rate with a 24 MHz crystal

oscillator or external clock frequency

s 1 byte Transmit FIFO

s 1 byte Receive FIFO with error tags

s Status report registers

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

DTR#, RI#, CD#)

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

with even, odd, or no parity

• Crystal oscillator or external clock input

• TTL compatible inputs, outputs

• Industrial temperature ranges

• 48-TQFP and 44-PLCC packages

FIGURE 1. ST16C2450 BLOCK DIAGRAM

A2:A0

D7:D0

IOR#

IOW#

CSA#

CSB#

INTA

INTB

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

2.25 to 5.5 Volt VCC

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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