ST16C2552IJ44 Exar Corporation, ST16C2552IJ44 Datasheet

ST16C2552IJ44

Manufacturer Part Number

ST16C2552IJ44

Description

PLCC44

Manufacturer

Exar Corporation

Datasheet

1.ST16C2552IJ44.pdf (36 pages)

Specifications of ST16C2552IJ44

Date_code

09+

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OCTOBER 2006

GENERAL DESCRIPTION

The

asynchronous receiver and transmitter (UART). The

ST16C2552 is an improved version of the PC16552

UART. The 2552 provides enhanced UART functions

with 16 byte FIFOs, a modem control interface, and

data rates up to 4 Mbps. Onboard status registers

provide

operational status.

control features may be tailored by external software

to meet specific user requirements. Indepedendent

programmable baud rate generators are privded 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

loop-back capability allows onboard diagnostics. The

2552 provides block mode data transfers (DMA)

through FIFO controls. DMA transfer monitoring is

provided through the signals TXRDY# and RXRDY#.

An Alternate Function Register provides the user with

the ability to initialize both UARTs concurrently. The

2552 is available in the 44-PLCC package.

APPLICATIONS

•

Exar

IGURE

Portable Appliances

Telecommunication Network Routers

Ethernet Network Routers

Cellular Data Devices

Factory Automation and Process Controls

Corporation 48720 Kato Road, Fremont CA, 94538

ST16C2552

1. ST16C2552 B

the

BAUDOUTA#, or

BAUDOUTB#, or

TXRDYA#

TXRDYB#

RXRDYA#)

RXRDYB#)

CHSEL

(OP2A#,

(OP2B#,

user

D7:D0

A2:A0

MFA#

MFB#

Reset

IOW#

IOR#

INTA

INTB

CS#

(2552)

System interrupts and modem

with

LOCK

error

8-bit Data

Interface

Bus

IAGRAM

indications

dual

universal

and

2.97V TO 5.5V DUAL UART WITH 16-BYTE FIFO

•

(510) 668-7000

UART

BRG

Regs

(same as Channel A)

Modem Control Logic

Crystal Osc/Buffer

UART Channel B

FEATURES

Added feature in devices with top marking "A2

YYWW" and newer:

•

UART Channel A

Pin-to-pin and functionally compatible to National

PC16552 and Exar’s XR16L2752 and XR16C2852

4 Mbps transmit/receive operation (64 MHz

External Clock Frequency)

2 Independent UART Channels

DMA operation and DMA monitoring via TXRDY#

and RXRDY# pins

UART internal register sections A & B may be

written to concurrently

Multi-Function

functions with few I/O pins

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

even, odd, or no parity

Crystal oscillator or external clock input

16 Byte TX FIFO

16 Byte RX FIFO

■

TX & RX

5 Volt Tolerant Inputs

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 RX FIFO Trigger Levels

Fixed Transmit FIFO interrupt trigger level

Full Modem Interface (CTS#, RTS#, DSR#,

DTR#, RI#, CD#)

•

FAX (510) 668-7017

output

3.3V or 5V VCC

GND

TXA (or TXIRA)

RXA (or RXIRA)

TXB (or TXIRB)

RXB (or RXIRB)

XTAL1

XTAL2

CTS#A/B, RI#A/B,

CD#A/B, DSR#A/B

DTR#A/B, RTS#A/B

ST16C2552

allows

•

www.exar.com

2552BLK

REV. 4.2.1

package

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