LT1781 Low Power 5V RS232 Dual Driver/Receiver with ±15kV ESD Protection
The LT®1780/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
产品特点 Features
- 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 Off
or 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
典型应用图
参数
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LT1781 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) * |
| LT1781CN |
PDIP |
16 |
C |
$3.35 |
$2.75 |
| LT1781CN#PBF |
PDIP |
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 |
SO |
16 |
C |
$3.65 |
$3.00 |
| LT1781CSW#PBF |
SO |
16 |
C |
$3.65 |
$3.00 |
| LT1781CSW#TR |
SO |
16 |
C |
|
$3.06 |
| LT1781CSW#TRPBF |
SO |
16 |
C |
|
$3.06 |
| LT1781IN |
PDIP |
16 |
I |
$4.40 |
$3.40 |
| LT1781IN#PBF |
PDIP |
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 |
SO |
16 |
I |
$4.85 |
$3.70 |
| LT1781ISW#PBF |
SO |
16 |
I |
$4.85 |
$3.70 |
| LT1781ISW#TR |
SO |
16 |
I |
|
$3.76 |
| LT1781ISW#TRPBF |
SO |
16 |
I |
|
$3.76 |
LT1781 数据手册及相关资料下载
- 数据手册 (英文) : LT1780 - Low Power 5V RS232 Dual Driver/Receiver with ±15kV ESD Protection.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) : DN71 - Regulator Circuit Generates Both 3.3V and 5V Outputs from 3.3V or 5V to Run Computers and RS232.PDF
- 设计要点 (英文) : DN75 - RS232 Interface Circuits for 3.3V Systems.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
