LT1781是Low Power 5V RS232 Dual Driver/Receiver with ±15kV ESD Protection

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LT1781 - LT1781是Low Power 5V RS232 Dual Driver/Receiver with ±15kV ESD Protection

LT1781是Linear公司的一款RS232 / RS562 收发器产品，LT1781是Low Power 5V RS232 Dual Driver/Receiver with ±15kV ESD Protection，本站介绍了LT1781的封装应用图解、特点和优点、功能等，并给出了与LT1781相关的凌力尔特元器件型号供参考。

LT1781 - Low Power 5V RS232 Dual Driver/Receiver with ±15kV ESD Protection

LT1781 - Low Power 5V RS232 Dual Driver/Receiver with ±15kV ESD Protection - Linear Technology（凌力尔特）

功能描述

The LT1780/LT1781 are dual RS232 driver/receiver pairs with integral charge pump to generate RS232 voltage levels from a single 5V supply. 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 LT1780/LT1781 to survive ±15kV air gap and ±8kV contact ESD tests per IEC 1000-4-2, eliminating the need for costly TransZorbs on the RS232 line pins. The LT1780/LT1781 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 LT1780/LT1781 are direct upgrades to the LT1180A/LT1181A, LT1280A/LT1281A and LT1381 for applications which require the utmost ESD protection. The LT1781 is available in 16-pin DIP,SO and SW packages. The LT1780 is supplied in 18-pin DIP and SW packages for applications which require SHUTDOWN.

特点

10mA Max Supply Current

ESD Protection to IEC 1000-4-2 Level 4 ±15kV Air Gap, ±8kV Contact

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 Offor Powered Down

Meets All RS232 Specifications

Available With or Without Shutdown

Absolutely No Latch-up

应用

Portable Computers

Battery-Powered Systems

Power Supply Generator

Terminals

Modems

以下列出了不同封装及包装形式的具体型号,并标出了直接在linear官网上订货的价格（美元）

器件型号	封装	温度	价格 (以 1 ~ 99 片为批量)	价格 (以 1000 片为批量)
LT1781CN	N-16	C	$3.35	$2.75
LT1781CN#PBF	N-16	C	$3.35	$2.75
LT1781CS	SO-16	C	$3.60	$2.95
LT1781CS#PBF	SO-16	C	$3.60	$2.95
LT1781CS#TR	SO-16	C		$3.01
LT1781CS#TRPBF	SO-16	C		$3.01
LT1781CSW	SW-16	C	$3.65	$3.00
LT1781CSW#PBF	SW-16	C	$3.65	$3.00
LT1781CSW#TR	SW-16	C		$3.06
LT1781CSW#TRPBF	SW-16	C		$3.06
LT1781IN	N-16	I	$4.40	$3.40
LT1781IN#PBF	N-16	I	$4.40	$3.40
LT1781IS	SO-16	I	$4.65	$3.60
LT1781IS#PBF	SO-16	I	$4.65	$3.60
LT1781IS#TR	SO-16	I		$3.66
LT1781IS#TRPBF	SO-16	I		$3.66
LT1781ISW	SW-16	I	$4.85	$3.70
LT1781ISW#PBF	SW-16	I	$4.85	$3.70
LT1781ISW#TR	SW-16	I		$3.76
LT1781ISW#TRPBF	SW-16	I		$3.76