LT1280A Low Power 5V RS232 Dual Driver/Receiver with 0.1µF Capacitors

The LT®1280A/LT1281A 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 120kbaud even while driving heavy capacitive loads. New ESD structures on the chip allow the LT1280A/LT1281A to survive multiple ±10kV strikes, eliminating the need for costly TransZorbs® on the RS232 line pins. The LT1280A/LT1281A 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 LT1281A is available in 16-pin DIP and SO packages. The LT1280A is supplied in 18-pin DIP and SO packages for applications which require shutdown

产品特点 Features

10mA Max Supply Current
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

应用

Portable Computers
Battery-Powered Systems
Power Supply Generator
Terminals
Modems

典型应用图

参数

LT1280A 订购信息和价格参考Package Variations and Pricing

器件型号	封装	引脚	温度	价格 (以 1 ~ 99 片为批量)	价格 (以 1000 片为批量) *
LT1280ACN	PDIP	18	C	$3.33	$2.65
LT1280ACN#PBF	PDIP	18	C	$3.33	$2.65
LT1280ACSW	SO	18	C	$3.67	$2.85
LT1280ACSW#PBF	SO	18	C	$3.67	$2.85
LT1280ACSW#TR	SO	18	C		$2.95
LT1280ACSW#TRPBF	SO	18	C		$2.95
LT1280AIN	PDIP	18	I	$4.90	$4.00
LT1280AIN#PBF	PDIP	18	I	$4.90	$4.00
LT1280AISW	SO	18	I	$5.15	$4.25
LT1280AISW#PBF	SO	18	I	$5.15	$4.25
LT1280AISW#TR	SO	18	I		$4.35
LT1280AISW#TRPBF	SO	18	I		$4.35

LT1280A 数据手册及相关资料下载

数据手册 (英文) : LT1280A - Low Power 5V RS232 Dual Driver/Receiver with 0.1µF Capacitors.PDF
设计要点 (英文) : DN14 - Extending the Applications of 5V Powered RS232 Transceivers.PDF
设计要点 (英文) : DN27 - Design Considerations for RS-232 Interfaces.PDF
设计要点 (英文) : DN29 - A Single Supply RS232 Interface for Bipolar A to D Converters.PDF
设计要点 (英文) : DN64 - RS232 Transceivers for Hand Held Computers Withstand 10kV ESD.PDF
设计要点 (英文) : DN80 - ESD Testing for RS232 Interface Circuits.PDF
可靠性数据 : R001 Reliability Data .PDF
产品选型卡 : LTM2882 - Isolated RS232 + 1W Power.PDF
产品选型卡 : RS232 Quick Guide.PDF