LT1180A - Low Power 5V RS232 Dual Driver/Receiver with 0.1µF Capacitors

The LT®1180A/LT1181A are dual RS232 driver/receiver pairs with integral charge pump to generate RS232 voltage levels from a single 5V supply. These circuits feature rugged bipolar design to provide operating fault tolerance and ESD protection unmatched by competing CMOS designs. Using only 0.1µF external capacitors, these circuits consume only 40mW of power, and can operate to 120k baud even while driving heavy capacitive loads. New ESD structures on the chip allow the LT1180A/LT1181A to survive multiple ±10kV strikes, eliminating the need for costly TransZorbs® on the RS232 line pins. The LT1180A/LT1181A are fully compliant with EIA RS232 standards. Driver outputs are protected from overload, and can be shorted to ground or up to ±30V without damage. During shutdown or power-off conditions, driver and receiver outputs are in a high impedance state, allowing line sharing.

The LT1181A is available in 16-pin DIP and SO packages. The LT1180A is supplied in 18-pin DIP and SO packages for applications which require shutdown.

Features
  • ESD Protection over ±10kV
  • Uses Small Capacitors: 0.1µF
  • 120kBaud Operation for RL = 3k, CL = 2500pF
  • 250kBaud Operation for RL = 3k, CL = 1000pF
  • Outputs Withstand ±30V Without Damage
  • CMOS Comparable Low Power: 40mW
  • Operates from a Single 5V Supply
  • Rugged Bipolar Design
  • Outputs Assume a High Impedance State When Off or Powered Down
  • Meets All RS232 Specifications
  • Available With or Without Shutdown
  • Absolutely No Latch-up
  • Available in SO Package
Typical Application
LT1180A Typical Application
LT1180A Typical Application
Applications
  • Portable Computers
  • Battery-Powered Systems
  • Power Supply Generator
  • Terminals
  • Modems
Packaging
LT1180A Package Drawing
LT1180A Package Drawing
Order Information
Part NumberPackageTempPrice(1-99)Price (1k)*
LT1180ACN#PBFN-18C$3.08$2.40
LT1180ACSW#PBFSW-18C$3.42$2.65
LT1180ACSW#TRPBFSW-18C$2.75
LT1180AIN#PBFN-18I$4.00$3.15
LT1180AISW#PBFSW-18I$4.42$3.40
LT1180AISW#TRPBFSW-18I$3.50
Datasheet
Application Note
Design Note
Reliability Data
Product Selector Card
CAD Symbol
Related Products
LT1180A - Low Power 5V RS232 Dual Driver/Receiver with 0.1µF Capacitors
AN62 - Data Acquisition Circuit Collection
DN14 - Extending the Applications of 5V Powered RS232 Transceivers
DN27 - Design Considerations for RS-232 Interfaces
DN29 - A Single Supply RS232 Interface for Bipolar A to D Converters
DN80 - ESD Testing for RS232 Interface Circuits
R001 Reliability Data
RS232 Quick Guide
LT1180A Footprints and Symbols