LTC1487 Ultra-Low Power RS485 with Low EMI, Shutdown and High Input Impedance
The LTC™1487 is an ultra-low power differential line transceiver designed with high impedance inputs allowing up to 256 transceivers to share a single bus. It meets the requirements of RS485 and RS422. The LTC1487 features output drivers with controlled slew rate, decreasing the EMI radiated from the RS485 lines, and improving signal fidelity with misterminated lines. The CMOS design offers significant power savings without sacrificing ruggedness against overload or ESD damage. Typical quiescent current is only 80µA while operating and 1µA in shutdown. 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 iputs are left open. I/O pins are protected against multiple ESD strikes of over ±10kV using the Human Body Model. The LTC1487 is fully specified over the commercial temperature range and is available in 8-pin DIP and SO packages
产品特点 Features
- High Input Impedance: Up to 256 Transceivers on the Bus
- Low Power: ICC = 120µA Max with Driver Disabled
- ICC = 200µA Max with Driver Enabled, No Load
- 1µA Quiescent Current in Shutdown Mode
- Controlled Slew Rate Driver for Reduced EMI
- Single 5V Supply
- ESD Protection to ±10kV On Receiver Inputs and Driver outputs
- -7V to 12V Common-Mode Range Permits ±7V Ground Difference Between Devices on the Data Line
- Thermal Shutdown Protection
- Power Up/Down Glitch-Free Driver Outputs Permit Live Insertion or Removal of Transceiver
- Driver Maintains High Impedance in Three-State or with the Power Off
- Pin Compatible with the LTC485
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应用
- Battery-Powered RS485/RS422 Applications
- Low Power RS485/RS422 Transceiver
- Level Translator
典型应用图
参数
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LTC1487 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) * |
| LTC1487CN8 |
PDIP |
8 |
C |
$3.15 |
$2.55 |
| LTC1487CN8#PBF |
PDIP |
8 |
C |
$3.15 |
$2.55 |
| LTC1487CS8 |
SO |
8 |
C |
$3.40 |
$2.70 |
| LTC1487CS8#PBF |
SO |
8 |
C |
$3.40 |
$2.70 |
| LTC1487CS8#TR |
SO |
8 |
C |
|
$2.76 |
| LTC1487CS8#TRPBF |
SO |
8 |
C |
|
$2.76 |
LTC1487 数据手册及相关资料下载
- 数据手册 (英文) : LTC1487 - Ultra-Low Power RS485 with Low EMI, Shutdown and High Input Impedance.PDF
- 设计要点 (英文) : DN102 - RS485 Transceivers Reduce Power and EMI.PDF
- 可靠性数据 : R113 Reliability Data .PDF
- 产品选型卡 : Ultra Rugged ±60V RS485 Transceivers.PDF
- 产品选型卡 : RS485 Quick Guide.PDF
