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謾莽

APRIL 2002

XR16C2852

3.3V AND 5V DUART WITH 128-BYTE FIFO

REV. 2.0.0

GENERAL DESCRIPTION

The XR16C2852

1

(2852) is a dual universal asyn-

chronous receiver and transmitter (UART). The de-

vice operates at 3.3V and 5V and is pin-to-pin com-

patible to Exar鈥檚 ST16C2552 and XR16L2752. The

2852 register set is compatible to the ST16C2552

and the XR16C2752 enhanced features. It supports

the Exar鈥檚 enhanced features of 128 bytes of TX and

RX FIFOs, programmable FIFO trigger level and

FIFO level counters, automatic hardware (RTS/CTS)

and software flow control, automatic RS-485 half du-

plex direction control output and a complete modem

interface. Onboard registers provide the user with op-

erational status and data error flags. An internal loop-

back capability allows system diagnotics. Indepen-

dent programmable baud rate generators are provid-

ed in each channel to select data rates up to 3.125

Mbps at 5V. The 2852 is available in the 44-pin PLCC

package.

N

OTE

:

1 Covered by U.S. Patent #5,649,122 and #5,832,205

FEATURES

鈥?/div>

Pin-to-pin compatible to Exar鈥檚 ST16C2552 and

XR16L2752

鈥?/div>

Improved version of PC16C552

鈥?/div>

Two independent UART channels

鈥egister

set compatible to 16C550

鈥p

to 3 Mbps at 5V, and 2 Mbps at 3.3V

鈥ransmit

and Receive FIFOs of 128 bytes

鈥rogrammable

TX and RX FIFO Trigger Levels

鈥ransmit

and Receive FIFO Level Counters

鈥utomatic

Hardware (RTS/CTS) Flow Control

鈥electable

Auto RTS Flow Control Hysteresis

鈥utomatic

Software (Xon/Xoff) Flow Control

鈥utomatic

RS-485 Half-duplex Direction Control

Output

鈥ireless

Infrared (IrDA 1.0) Encoder/Decoder

鈥utomatic

sleep mode

鈥ull

modem interface

鈥?/div>

Alternate Function Register

鈥?/div>

Device Identification and Revision

鈥?/div>

Crystal oscillator or external clock input

鈥?/div>

3.3 V or 5 V operation

鈥?/div>

Industrial and commercial temperature ranges

鈥?/div>

44-PLCC package

APPLICATIONS

鈥?/div>

Portable Appliances

鈥?/div>

Telecommunication Network Routers

鈥?/div>

Ethernet Network Routers

鈥?/div>

Cellular Data Devices

鈥?/div>

Factory Automation and Process Controls

F

IGURE

1. XR16C2852 B

LOCK

D

IAGRAM

3 .3V o r 5V V C C

A 2:A 0

D 7 :D 0

IO R #

IO W #

CS#

CHSEL

IN T A

IN T B

TXRDYA#

TXRDYB#

M FA#

(O P 2A #,

B A U D O U T A #, or

R X R D Y A #)

GND

U A R T C h a n ne l A

UART

R e gs

BRG

8 -b it D a ta

B us

In te rfa ce

1 28 B yte T X F IF O

TX & RX

IR

ENDEC

R X A (o r R X IR A )

T X B (o r T X IR B )

R X B (o r R X IR B )

XTAL1

XTAL2

C T S #A /B , R I# A /B ,

C D # A /B , D S R # A /B

D T R # A /B , R T S # A /B

T X A (o r T X IR A )

1 28 B yte R X F IF O

U A R T C h a n ne l B

(s am e a s C ha n n el A )

C ry sta l O s c/B u ffe r

M FB#

(O P 2B #,

B A U D O U T B #, o r

R X R D Y B #)

M o de m C on tro l L o g ic

R e se t

EXAR

Corporation 48720 Kato Road, Fremont CA, 94538

鈥?/div>

(510) 668-7000

鈥?/div>

FAX (510) 668-7017

鈥?/div>

www.exar.com

鈥?/div>

uarttechsupport@exar.com

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XR16C2852 Datasheet

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