sp337e Exar Corporation, sp337e Datasheet

sp337e

Manufacturer Part Number

sp337e

Description

3.3v To 5v Rs-232/rs-485/rs-422 Multiprotocol Transceiver

Manufacturer

Exar Corporation

Datasheet

1.SP337E.pdf (18 pages)

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Download datasheet (987Kb)

MARCH 2011

GENERAL DESCRIPTION

The SP337E is a dual mode serial transceiver

containing both RS-232 and RS-485/422 line drivers

and receivers. The RS-232 mode provides three

drivers and five receivers to support all eight signals

commonly used in the DB9 serial port connector

(3TX/5RX). In RS-485 mode the device features two

independent high speed RS-485/422 transmit and

receive channels (2TX/2RX). The default RS-485

configuration is full-duplex, but half-duplex operation

can be obtained by tying together the TX and RI pins,

and the TXEN and RXEN signals.

The SP337E is pin compatible to Exar’s SP334.

The SP337EB features a maximum data rate of

250kbps in RS-232 mode and a maximum data rate

of 15Mbps in RS-485. However, the SP337EU

features a maximum data rate of 1Mbps in RS-232

mode and a maximum data rate of 15Mbps in RS-485

mode.

The Exar-patented high efficiency charge pumps

(5,306,954) deliver true RS-232 driver output

voltages from a single power supply from 3.3V to 5V.

Charge pump outputs are self-monitored to minimize

power consumption. The SP337E requires only four

0.1μF capacitors for complete functionality.

All RS-485 receivers or transceivers feature high

impedance inputs which allow up to 256 transceivers

on a single shared bus. When configured in RS-485

mode, each driver may be individually enabled or put

into tri-state, simplifying use on shared buses or for

bidirectional communication. The RS-485/422 drivers

can be disabled (high-Z output) by the TXEN enable

pin. The RS-232 receiver outputs can be disabled by

the RXEN enable pin.

All receivers have advanced failsafe protection to

prevent oscillation when inputs are un-connected. In

RS-232 mode, each receiver input has a 5kΩ pull-

down to ground. in RS-485 mode, receivers will

default to output logic 1 if inputs are floating, shorted,

or open but terminated.

All driver outputs and receiver inputs are protected

against ESD strikes up to +/-15,000 volts.

Exar

Corporation 48720 Kato Road, Fremont CA, 94538

3.3V TO 5V RS-232/RS-485/RS-422 MULTIPROTOCOL TRANSCEIVER

•

(510) 668-7000

FEATURES

•

TYPICAL APPLICATIONS

•

3.3V to 5V Single Supply Operation

Robust +/-15kV ESD Protection

Max Data Rate of 15Mbps in RS-485 mode

and up to 1Mbps in RS-232 mode (SP337EU)

3 Drivers, 5 Receivers RS-232/V.28

2 Drivers, 2 Receivers RS-485/RS-422

RS-485 Advanced Failsafe on Open, Short or

Terminated Lines

Full Differential Driver Tri-State (Hi-Z) Control

Receiver Output Tri-State Control

WSOIC-28 or TSSOP-28 Package

Dual Protocol Serial Ports (RS-232 or RS-485)

Industrial Computers

Industrial and Process Control Equipment

Point-Of-Sales Equipment

Networking Equipment

HVAC Controls Equipment

Building Security Equipment

■

Human Body Model

Full-Duplex Configuration

1/8th Unit Load, up to 256 receivers on bus

•

FAX (510) 668-7017

•

www.exar.com

SP337E

REV. 1.0.2

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