LTC491 Differential Driver and Receiver Pair

The LTC®491 is a low power differential bus/line transceiver designed for multipoint data transmission standard RS485 applications with extended common mode range (12V to –7V). It also meets the requirements of RS422.

The CMOS design offers significant power savings over its bipolar counterpart without sacrificing ruggedness against overload or ESD damage.

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 inputs are left open.

Both AC and DC specifications are guaranteed from 0°C to 70°C and 4.75V to 5.25V supply voltage range

产品特点 Features

Low Power: ICC = 300µA Typical
Designed for RS485 or RS422 Applications
Single 5V Supply
-7V to 12V Bus Common Mode Range Permits ±7V Ground Difference Between Devices on the Bus
Thermal Shutdown Protection
Power-Up/Down Glitch-Free Driver Outputs Permit Live Insertion or Removal of Package
Driver Maintains High Impedance in Three-State or with the Power Off
Combined Impedance of a Driver Output and Receiver Allows up to 32 Transceivers on the Bus
70mV Typical Input Hysteresis
28ns Typical Driver Propagation Delays with 5ns Skew for 2.5MB Operation
Pin Compatible with the SN75180
Available in 14-Lead PDIP and SO Packages

应用

Low Power RS485/RS422 Transceiver
Level Translator

典型应用图

参数

LTC491 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) *
LTC491CN	PDIP	14	C	$3.25	$2.65
LTC491CN#PBF	PDIP	14	C	$3.25	$2.65
LTC491CS	SO	14	C	$3.92	$3.20
LTC491CS#PBF	SO	14	C	$3.92	$3.20
LTC491CS#TR	SO	14	C		$3.26
LTC491CS#TRPBF	SO	14	C		$3.26
LTC491IN	PDIP	14	I	$4.00	$3.30
LTC491IN#PBF	PDIP	14	I	$4.00	$3.30
LTC491IS	SO	14	I	$4.75	$3.90
LTC491IS#PBF	SO	14	I	$4.75	$3.90
LTC491IS#TR	SO	14	I		$3.96
LTC491IS#TRPBF	SO	14	I		$3.96

LTC491 数据手册及相关资料下载

数据手册 (英文) : LTC491 - Differential Driver and Receiver Pair.PDF
设计要点 (英文) : DN102 - RS485 Transceivers Reduce Power and EMI.PDF
设计要点 (英文) : DN39 - Low Power CMOS RS485 Transceiver.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