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Data Sheet

FULL DATA SHEET (PDF, 320kB) Download   E-Mail

Description

The MAX3157 is a high CMRR RS-485/RS-422 data-communications interface providing ±50V isolation in a hybrid microcircuit. A single +5V supply on the logic side powers both sides of the interface, with external ±50V capacitors transferring power from the logic side to the isolated side. Each MAX3157 contains one transmitter and one receiver and is guaranteed to operate at data rates up to 250kbps. Drivers are short-circuit current limited and protected against excessive power dissipation by thermal shutdown circuitry that places the driver outputs into a high-impedance state. The receiver input has a fail-safe feature that guarantees a logic high receiver output if the inputs are open, shorted, or connected to a terminated transmission line with all drivers disabled. The MAX3157 typically draws 25mA of supply current when unloaded or when fully loaded with the driver disabled. Supply current drops to 25µA when the device is placed in shutdown mode. The device is pin selectable between half- and full-duplex mode and also features independently programmable receiver and transmitter output phase through separate pins. The MAX3157 is a low-cost replacement for opto-isolated transceivers. For fully isolated RS-485/RS-422 transceivers, refer to the MAX1480 family data sheet.

Key Features		Applications/Uses
±50V Isolated Data Interface +5V Single Supply Low-Cost Replacement for Opto-Isolated Transceivers True Fail-Safe Receiver While Maintaining EIA/TIA-485 Compliance Pin-Selectable Full/Half-Duplex Operation Phase Controls to Correct for Twisted-Pair Reversal 25µA Low-Power Shutdown Mode Thermal Shutdown for Driver Overload Protection 28-Pin SSOP Package Slew Rate Limited Reduced EMI		Automated Test Equipment (ATE) Building Energy Management (HVAC) Building Security/Remote Cameras High-Speed Access (Telecom) Industrial Sensor Transmitters/Transducers Motor and Motion Control POS Terminals Programmable Logic Controllers Remote Cameras Telecom Switches Test and Measurement Equipment X-Ray and Ultrasound Diagnostics

Diagram

Typical Operating Circuit

Application Notes

Application Note 736: RS-485 (EIA/TIA-485) Differential Data Transmission System Basics - MAX3157 Application Note 763: Guidelines for Proper Wiring of an RS-485 (TIA/EIA-485-A) Network - MAX3157 Application Note 1137: Using the MAX3157 High-CMR RS-485 Transceivers - MAX3157 Application Note 2045: Understanding Common-Mode Signals - MAX3157

Evaluation Kits

none

Design Guides

Interface (PDF)

Reliability Reports

Show FIT data for: MAX3157 Request Reliability Report for: MAX3157

Software/Models

none

Ordering Information
Notes: Other options and links for purchasing parts are listed at: http://www.maxim-ic.com/sales. Didn't Find What You Need? Ask our applications engineers. Expert assistance in finding parts, usually within one business day. Part number suffixes: T or T&R = tape and reel; + = RoHS/lead-free; # = RoHS/lead-exempt. More: SeeFull Data Sheet or Part Naming Conventions. * Some packages have variations, listed on the drawing. "PkgCode/Variation" tells which variation the product uses. Note that "+", "#", "-" in the part number suffix describes RoHS status. Package drawings may show a different suffix character.
Devices: 1-12 of 12
MAX3157	Free Sample	Buy	Package: TYPE PINS FOOTPRINT   DRAWING CODE/VAR *	Temp	RoHS/Lead-Free? Materials Analysis
MAX3157CPI			PDIP(W);28 pin;593 mm² Outline Drawing: 21-0044 (PDF) Land Pattern: Not Applicable Use pkgcode/variation: P28M-8*	0°C to +70°C	RoHS/Lead-Free: No Materials Analysis
MAX3157CPI+			PDIP(W);28 pin;593 mm² Outline Drawing: 21-0044 (PDF) Land Pattern: Not Applicable Use pkgcode/variation: P28M+8*	0°C to +70°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX3157EPI			PDIP(W);28 pin;593 mm² Outline Drawing: 21-0044 (PDF) Land Pattern: Not Applicable Use pkgcode/variation: P28M-8*	-40°C to +85°C	RoHS/Lead-Free: No Materials Analysis
MAX3157EPI+			PDIP(W);28 pin;593 mm² Outline Drawing: 21-0044 (PDF) Land Pattern: Not Applicable Use pkgcode/variation: P28M+8*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX3157CAI			SSOP;28 pin;82 mm² Outline Drawing: 21-0056 (PDF) Land Pattern: 90-0095 (PDF) Use pkgcode/variation: A28M-3*	0°C to +70°C	RoHS/Lead-Free: No Materials Analysis
MAX3157CAI-T			SSOP;28 pin;82 mm² Outline Drawing: 21-0056 (PDF) Land Pattern: 90-0095 (PDF) Use pkgcode/variation: A28M-3*	0°C to +70°C	RoHS/Lead-Free: No Materials Analysis
MAX3157CAI+			SSOP;28 pin;82 mm² Outline Drawing: 21-0056 (PDF) Land Pattern: 90-0095 (PDF) Use pkgcode/variation: A28M+3*	0°C to +70°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX3157CAI+T			SSOP;28 pin;82 mm² Outline Drawing: 21-0056 (PDF) Land Pattern: 90-0095 (PDF) Use pkgcode/variation: A28M+3*	0°C to +70°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX3157EAI			SSOP;28 pin;82 mm² Outline Drawing: 21-0056 (PDF) Land Pattern: 90-0095 (PDF) Use pkgcode/variation: A28M-3*	-40°C to +85°C	RoHS/Lead-Free: No Materials Analysis
MAX3157EAI-T			SSOP;28 pin;82 mm² Outline Drawing: 21-0056 (PDF) Land Pattern: 90-0095 (PDF) Use pkgcode/variation: A28M-3*	-40°C to +85°C	RoHS/Lead-Free: No Materials Analysis
MAX3157EAI+			SSOP;28 pin;82 mm² Outline Drawing: 21-0056 (PDF) Land Pattern: 90-0095 (PDF) Use pkgcode/variation: A28M+3*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX3157EAI+T			SSOP;28 pin;82 mm² Outline Drawing: 21-0056 (PDF) Land Pattern: 90-0095 (PDF) Use pkgcode/variation: A28M+3*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis

More Information

New Product Press Release 2000-08-07  Product Ad: Download

Related Products

MAX3480A, MAX3480B Complete, Isolated, 3.3V RS-485/RS-422 Data Interface MAX1480A, MAX1480B, MAX1480C, MAX1490A, MAX1490B Complete, Isolated RS-485/RS-422 Data Interface

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Description   Key Features   Applications/Uses   Key Specifications   Diagram

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