Maxim > Products > Interface > MAX250, MAX251

MAX250, MAX251

5V, Isolated, RS-232 Driver Receiver

Overview

Status

Active: In Production.

Description

The MAX250 and MAX251 chip set form the heart of a complete, electronically isolated, RS-232 dual transmitter/receiver. By combining many functions on two chips, the cost and complexity required for an isolated digital interface is greatly reduced. Four low cost optocouplers, four capacitors, a diode and a small pot-core type transformer are all that are required to complete a 19.2k baud transceiver. Faster data rates are possible by using high speed optocouplers. In addition to the driving and receiving circuitry for the optocouplers, the chip set includes a push-pull transformer driver to supply power to the interface's isolated side.

Other convenient features include single +5V operation, a low power shutdown mode, and output enable control for three-state operation. The MAX250 and MAX251 are supplied in 14 lead DIP, 14 lead small outline and 20 leadless chip carrier packages.

The MAX252 has all the required components for RS-232 communication in a single package.

Data Sheet

Download	Rev 0	(PDF, 428kB)
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Key Features

Isolated Data Interface
Single +5V Supply
Uses Low Cost Optocouplers
5µW Power Shutdown
2 Transmitters and 2 Receivers

Applications/Uses

Bridge Ground Differentials
Data Links To Analog Circuits
High Noise Data Communications
Industrial Communications

Key Specifications:

RS-232 Line Driver/Receivers

Part Number

V_SUPPLY
(V)

Data Rate
(kbps)

I_CC
(mA)

Internal Charge Pump

Budgetary
Price

min

typ

See Notes

MAX250

116

0.1

Yes

$3.39 @1k

MAX251

See All RS-232 Line Driver/Receivers (152)

Pricing Notes:

This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific prices and delivery, please see the price and availability page or contact an authorized distributor.

Diagram

Pin Configuration

Notes and Comments

Isolated RS-232 chipset

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Information Index

Overview		Design Resources		Ordering Info		Related Products
Description Key Features Applications/Uses Key Specifications Diagram Notes and Comments		Data Sheet Technical Documents Evaluation Kits Reliability Reports Software/Models		Price and Availability Samples Buy Online Package Information Lead-Free Information		Similar Products by Function Similar Products by Application Evaluation Kits Products with Similar Part Numbers Products Used With This

Document Ref.: 19-1275 Rev 0; 1989-07-01
This page last modified: 2009-11-09