LTC1387 Single 5V RS232/RS485 Multiprotocol Transceiver

The LTC®1387 is a low power reconfigurable CMOS bidirectional transceiver. It can be configured as an RS485 differential port or as two RS232 single-ended ports. An onboard charge pump uses four 0.1µF capacitors to generate boosted positive and negative supplies, allowing the RS232 drivers to meet ±5V output swing requirements with only a single 5V supply. A shutdown mode reduces the ICC supply current to 5µA.

The RS232 transceivers are in full compliance with RS232 specification. The RS485 transceiver is in full compliance with RS485 and RS422 specifications. The RS485 receiver assumes a known output state when the inputs are floating or shorted to ground. All interface drivers feature short-circuit and thermal shutdown protection. An enable pin allows RS485 driver outputs to be forced into high impedance which is maintained even when the outputs are forced beyond supply rails or the power is off. A loop back mode allows the driver outputs to be connected back to the receiver inputs for diagnostic self-test.

The LTC1387 is available in 20-pin plastic SSOP and SW packages

产品特点 Features

Two RS232 Transceivers or One RS485 Transceiver
Operates from a Single 5V Supply
Guaranteed Receiver Output with Inputs Floating or Shorted to Ground
Logic Selectable Fast/Slow RS485 Driver Slew Rate
Low Supply Current: 7mA Typical
5µA Supply Current in Shutdown
Self-Testing Capability in Loopback Mode
Separate Driver and Receiver Enable Controls
Driver Maintains High Impedance in Three-State,Shutdown or with Power Off
Receiver Inputs Can Withstand ±25V

参数

应用

Point-of-Sale Terminals
Software Selectable Multiprotocol Interface Ports
Low Power RS485/RS422/RS232/EIA562 Interface
Cable Repeaters
Level Translators

典型应用图

LTC1387 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) *
LTC1387CG	SSOP	20	C	$6.10	$4.80
LTC1387CG#PBF	SSOP	20	C	$6.10	$4.80
LTC1387CG#TR	SSOP	20	C		$4.90
LTC1387CG#TRPBF	SSOP	20	C		$4.90
LTC1387CSW	SO	20	C	$5.65	$4.50
LTC1387CSW#PBF	SO	20	C	$5.65	$4.50
LTC1387CSW#TR	SO	20	C		$4.60
LTC1387CSW#TRPBF	SO	20	C		$4.60
LTC1387IG	SSOP	20	I	$7.00	$5.50
LTC1387IG#PBF	SSOP	20	I	$7.00	$5.50
LTC1387IG#TR	SSOP	20	I		$5.60
LTC1387IG#TRPBF	SSOP	20	I		$5.60
LTC1387ISW	SO	20	I	$6.50	$5.20
LTC1387ISW#PBF	SO	20	I	$6.50	$5.20
LTC1387ISW#TR	SO	20	I		$5.30
LTC1387ISW#TRPBF	SO	20	I		$5.30

LTC1387 数据手册及相关资料下载

数据手册 (英文) : LTC1387 - Single 5V RS232/RS485 Multiprotocol Transceiver.PDF
应用指南 (英文) : AN87 - linear Technology Magazine Circuit Collection, Volume V: Data Conversion, Interface and Signal Conditioning Products.PDF
可靠性数据 : R277 Reliability Data .PDF
产品选型卡 : LTC2870/LTC2871/LTC2872 Multiprotocol Transceivers.PDF