XR16V554 datasheet(1/45 Pages) EXAR

Part #	XR16V554

Description	2.25V TO 3.6V QUAD UART WITH 16-BYTE FIFO

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Manufacturer	EXAR [Exar Corporation]

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

XR16V554/554D

2.25V TO 3.6V QUAD UART WITH 16-BYTE FIFO

SEPTEMBER 2007

REV. 1.0.2

GENERAL DESCRIPTION

The

XR16V554

(V554)

is

a

quad

Universal

Asynchronous Receiver and Transmitter (UART) with

16 bytes of transmit and receive FIFOs, selectable

receive FIFO trigger levels and data rates of up to 4

Mbps at 3.3 V. Each UART has a set of registers that

provide the user with operating status and control,

receiver error indications, and modem serial interface

controls. An internal loopback capability allows

onboard diagnostics. The V554 is available in a 48-

pin QFN, 64-pin LQFP, 68-pin PLCC and 80-pin

LQFP packages. The 64-pin and 80-pin packages

only offer the 16 mode interface, but the 48- and 68-

pin packages offer an additional 68 mode interface

which

allows

easy

integration

with

Motorola

processors. The XR16V554IV (64-pin) offers three

state

interrupt

output

while

the

XR16V554DIV

provides continuous interrupt output. The XR16V554

is compatible with the industry standard ST16C554.

FEATURES

• Pin-to-pin compatible with ST16C454, ST16C554,

TI’s TL16C554A and Philip’s SC16C554B

• Intel or Motorola Data Bus Interface select

• Four independent UART channels

■ Register Set Compatible to 16C550

■ Data rates of up to 4 Mbps at 3.3 V and 3.125

Mbps at 2.5 V

■ 16 byte Transmit FIFO

■ 16 byte Receive FIFO with error tags

■ 4 Selectable RX FIFO Trigger Levels

■ Full modem interface

• 2.25V to 3.6V supply operation

• Crystal oscillator or external clock input

APPLICATIONS

• Portable Appliances

• Telecommunication Network Routers

• Ethernet Network Routers

• Cellular Data Devices

• Factory Automation and Process Controls

FIGURE 1. XR16V554 BLOCK DIAGRAM

XTAL1

XTAL2

Crystal Osc / Buffer

Data Bus

Interface

UART Channel A

16 Byte TX FIFO

16 Byte RX FIFO

BRG

TX & RX

UART

Regs

2.25V to 3.6 V VCC

GND

554BLK

TXB, RXB, DTRB#,

DSRB#, RTSB#, CTSB#,

CDB#, RIB#

UART Channel B

(same as Channel A)

A2:A0

D7:D0

CSA#

16/68#

CSB#

INTA

INTB

IOW#

IOR#

Reset

INTSEL

TXRDY#A-D

RXRDY#A-D

UART Channel C

(same as Channel A)

TXA, RXA, DTRA#,

DSRA#, RTSA#, CTSA#,

CDA#, RIA#

TXC, RXC, DTRC#,

DSRC#, RTSC#, CTSC#,

CDC#, RIC#

UART Channel D

(same as Channel A)

TXD, RXD, DTRD#,

DSRD#, RTSD#, CTSD#,

CDD#, RID#

CSC#

CSD#

INTC

INTD

* 5 Volt Tolerant Inputs

( Except XTAL1input)

Similar Part No. - XR16V554

Manufacturer	Part #	Datasheet	Description
Exar Corporation	XR16V554	837Kb / 45P	2.25V TO 3.6V QUAD UART WITH 16-BYTE FIFO
	XR16V554D	837Kb / 45P	2.25V TO 3.6V QUAD UART WITH 16-BYTE FIFO
	XR16V554DIV	837Kb / 45P	2.25V TO 3.6V QUAD UART WITH 16-BYTE FIFO
	XR16V554IJ	837Kb / 45P	2.25V TO 3.6V QUAD UART WITH 16-BYTE FIFO
	XR16V554IL	837Kb / 45P	2.25V TO 3.6V QUAD UART WITH 16-BYTE FIFO

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XR16V554 Datasheet(PDF) 1 Page - Exar Corporation

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