xr16c864iq Exar Corporation, xr16c864iq Datasheet

xr16c864iq

Manufacturer Part Number

xr16c864iq

Description

Quad Uart With Rx/tx Fifo Counters And 128-byte Fifo

Manufacturer

Exar Corporation

Datasheet

1.XR16C864IQ.pdf (51 pages)

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APRIL 2004

GENERAL DESCRIPTION

The XR16C864

Universal Asynchronous Receiver and Transmitter

(UART) each with 128 bytes of transmit and receive

FIFOs, transmit and receive FIFO counters and

trigger levels, automatic hardware and software flow

control, automatic RS-485 half-duplex direction

control and data rates of up to 2 Mbps. Each UART

has a set of registers that provide the user with

operating

indications, and modem serial interface controls.

System interrupts may be tailored to meet design

requirements. An internal loopback capability allows

onboard diagnostics. The 864 is available in the 100-

pin QFP package.

channel status access by providing separate outputs

for TXRDY and RXRDY, offer separate Infrared TX

outputs and a separate clock input for channel C

(CHCCLK). The XR16C864 is compatible with the

industry standard ST16C554/554D, ST16C654/654D

and XR16C854/854D.

Exar

OTE

IGURE

RXDRQ # A-D

RXRDY# A-D

TXDRQ # A-D

TXRDY# A-D

Corporation 48720 Kato Road, Fremont CA, 94538

1 Covered by U.S. Patent #5,649,122 and #5,949,787.

DACK A-D

BCLK A-D

1. XR16C864 B

CHCCLK

CS# A-D

CLKSEL

INT A-D

INTSEL

XTAL1

XTAL2

16/68#

D7:D0

A2:A0

IOW #

IOR#

Reset

status

AEN

(864) is an enhanced quad

and

The XR16C864 offers faster

Crystal Osc/Buffer

LOCK

Data Bus

Motorola

Interface

control,

Memory

Access

Intel or

Direct

IAGRAM

receiver

error

2.97V TO 5.5V QUAD UART WITH 128-BYTE FIFO

•

5V tolerant inputs (except XTAL1)

UART

(510) 668-7000

Regs

BRG

(same as Channel A)

FEATURES

Added feature in devices with top mark date code of

"F2 YYWW" and newer:

APPLICATIONS

UART Channel B

UART Channel C

UART Channel D

UART Channel A

2.97 to 5.5 Volt Operation

Pin-to-pin compatible with the industry standard

ST16C554 and ST16C654 and TI’s TL16C554N

and TL16C754BFN

Intel or Motorola Data Bus Interface select

Four independent UART channels

Sleep Mode (200 uA typical)

Crystal oscillator or external clock input

Portable Appliances

Telecommunication Network Routers

Ethernet Network Routers

Cellular Data Devices

Factory Automation and Process Controls

128 Byte TX FIFO

TX & RX

128 Byte RX FIFO

5 volt tolerant inputs

Data rates of up to 2 Mbps

Transmit and Receive FIFOs of 128 bytes

Programmable TX and RX FIFO Trigger Levels

Transmit and Receive FIFO Level Counters

Automatic Hardware (RTS/CTS) Flow Control

Selectable Auto RTS Flow Control Hysteresis

Automatic Software (Xon/Xoff) Flow Control

Wireless Infrared (IrDA 1.0) Encoder/Decoder

•

ENDEC

FAX (510) 668-7017

XR16C864

TXA, RXA, IRTXA, DTRA#,

DSRA#, RTSA#, CTSA#,

CDA#, RIA#, OP2A#,

OP1A#/RS-485

TXB, RXB, IRTXB, DTRB#,

DSRB#, RTSB#, CTSB#,

CDB#, RIB#, OP2B#,

OP1B#/RS-485

TXC, RXC, IRTXC, DTRC#,

DSRC#, RTSC#, CTSC#,

CDC#, RIC#, OP2C#,

OP1C#/RS-485

TXD, RXD, IRTXD, DTRD#,

DSRD#, RTSD#, CTSD#,

CDD#, RID#, OP2D#,

OP1D#/RS-485

2.97V to 5.5V VCC

•

www.exar.com

854 BLK

REV. 2.0.1

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