LTC491

PRODUCTION

Differential Driver and Receiver Pair

Part Models: 6
1ku List Price: Starting From $3.41

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Overview

Low Power: I_CC= 300µA Typical
Designed for RS485 or RS422 Applications
Single 5V Supply
-7V to 12V Bus Common Mode Range Permits ±7V Ground Difference Between Devices on the Bus
Thermal Shutdown Protection
Power-Up/Down Glitch-Free Driver Outputs Permit Live Insertion or Removal of Package
Driver Maintains High Impedance in Three-State or with the Power Off
Combined Impedance of a Driver Output and Receiver Allows up to 32 Transceivers on the Bus
70mV Typical Input Hysteresis
28ns Typical Driver Propagation Delays with 5ns Skew for 2.5MB Operation
Pin Compatible with the SN75180
Available in 14-Lead PDIP and SO Packages

The LTC491 is a low power differential bus/line transceiver designed for multipoint data transmission standard RS485 applications with extended common mode range (12V to –7V). It also meets the requirements of RS422.

The CMOS design offers significant power savings over its bipolar counterpart without sacrificing ruggedness against overload or ESD damage.

The driver and receiver feature three-state outputs, with the driver outputs maintaining high impedance over the entire common mode range. Excessive power dissipation caused by bus contention or faults is prevented by a thermal shutdown circuit which forces the driver outputs into a high impedance state.

The receiver has a fail safe feature which guarantees a high output state when the inputs are left open.

Both AC and DC specifications are guaranteed from 0°C to 70°C and 4.75V to 5.25V supply voltage range.

Applications

Low Power RS485/RS422 Transceiver
Level Translator

Part Models: 6
1ku List Price: Starting From $3.41

Documentation

Data Sheet 1

LTC491: Differential Driver and Receiver Pair Data Sheet 08/27/2007

Reliability Data 1

R113 Reliability Data 03/26/2018

ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal. View our quality and reliability program and certifications for more information.

Part Model	Pin/Package Drawing	Documentation	CAD Symbols, Footprints, and 3D Models
LTC491CN#PBF	14-Lead PDIP (Narrow 0.3 Inch)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC491CS#PBF	14-Lead SOIC (Narrow 0.15 Inch)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC491CS#TRPBF	14-Lead SOIC (Narrow 0.15 Inch)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC491IN#PBF	14-Lead PDIP (Narrow 0.3 Inch)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC491IS#PBF	14-Lead SOIC (Narrow 0.15 Inch)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC491IS#TRPBF	14-Lead SOIC (Narrow 0.15 Inch)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys

Part Models	Product Lifecycle	PCN

Oct 11, 2022 - 22_0241 Epoxy Change from Henkel 8290 to 8290A for PDIP Package
		PCN22_0241_Form Material_Report Qualification Results Summary
LTC491CN#PBF	PRODUCTION
LTC491IN#PBF	PRODUCTION
Aug 6, 2022 - 22_0172 Laser Top Mark Conversion for PDIP Packages Assembled in ADPG [PNG]
		PCN22_0172_Form Material_Report Delta Qualification Matrix
LTC491CN#PBF	PRODUCTION
LTC491IN#PBF	PRODUCTION
Oct 24, 2024 - 24_0246 Migrating Bottom Trace Code Marking to Top Side Laser Marking for SOIC_N Package
		PCN24_0246_Form Material_Report Marking Comparison Delta Qualification Matrix
LTC491CS#PBF	PRODUCTION
LTC491CS#TRPBF	PRODUCTION
LTC491IS#PBF	PRODUCTION
LTC491IS#TRPBF	PRODUCTION
Oct 12, 2022 - 22_0251 Epoxy Change from Henkel 8290 to 8290A for 14-Lead SOIC Package
		PCN22_0251_Form Material_Report Qualification Results Summary
LTC491CS#PBF	PRODUCTION
LTC491CS#TRPBF	PRODUCTION
LTC491IS#PBF	PRODUCTION
LTC491IS#TRPBF	PRODUCTION
Aug 6, 2022 - 22_0173 Laser Top Mark Conversion for SOICN14 and SOICN16 Packages Assembled on ADPG [PNG]
		PCN22_0173_Form Material_Report Delta Qualification Matrix
LTC491CS#PBF	PRODUCTION
LTC491CS#TRPBF	PRODUCTION
LTC491IS#PBF	PRODUCTION
LTC491IS#TRPBF	PRODUCTION

This is the most up-to-date revision of the Data Sheet.

Hardware Ecosystem

Parts	Product Life Cycle	Description
Interface Transceivers & Isolators 2
LTM2881	PRODUCTION	Complete Isolated RS485/RS422 μModule Transceiver + Power
LTC2863	PRODUCTION	±60V Fault Protected 3V to 5.5V RS485/RS422 Transceivers

Evaluation Kits

Standard RS-485 Full-Duplex (14-lead SOIC) Evaluation Board, EVAL-RS485FDEBZ

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Product Details

The EVAL-RS485FDEBZ allows quick and easy evaluation of full-duplex RS-485 transceivers with standard 14-lead SOIC footprints. The evaluation board allows interfacing via screw terminal block to digital I/O for driver input (DI), receiver output (RO), driver enable (DE) and receiver output (RO). Bus signals A, B, Y and Z (full-duplex bus) can be connected to a bus screw terminal block. Termination resistors are fitted across A and B, as well as Y and Z. These can be connected in half-duplex configuration (A to Y, B to Z), in order to evaluate the RS-485 driver. Footprints are provided for pull-up and pull-down (biasing resistors) on the receiver inputs in order to provide the option to evaluate an RS-485 receiver with this configuration.

Devices for evaluation on the board must be ordered separately.

Resources

UG-543:Evaluation Boards for Full-Duplex and Half-Duplex RS-485 Transceivers (Rev.A)
4/19/2013

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