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LTC1484 Datasheet(PDF) 1 Page - Linear Technology |
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LTC1484 Datasheet(HTML) 1 Page - Linear Technology |
1 / 16 page 1 LTC1484 Low Power RS485 Transceiver with Receiver Fail-Safe s No Damage or Latchup to ±15kV ESD (Human Body Model), IEC-1000-4-2 Level 4 Contact ( ±8kV) and Level 3 ( ±8kV) Air Gap Specifications s Guaranteed High Receiver Output State for Floating, Shorted or Terminated Inputs with No Signal Present s Drives Low Cost Residential Telephone Wires s Low Power: ICC = 700µA Max with Driver Disabled s ICC = 900µA Max for Driver Enable with No Load s 20 µA Max Quiescent Current in Shutdown Mode s Single 5V Supply s – 7V to 12V Common Mode Range Permits ±7V Ground Difference Between Devices on the Data Line s Power Up/Down Glitch-Free Driver Outputs s Up to 32 Transceivers on the Bus s Pin Compatible with the LTC485 s Available in 8-Lead MSOP, PDIP and SO Packages The LTC ®1484 is a low power RS485 compatible trans- ceiver. In receiver mode, it offers a fail-safe feature which guarantees a high receiver output state when the inputs are left open, shorted together or terminated with no signal present. No external components are required to ensure the high receiver output state. Both driver and receiver feature three-state outputs with separate receiver and driver control pins. The driver outputs maintain high impedance over the entire com- mon mode range when three-stated. Excessive power dissipation caused by bus contention or faults is pre- vented by a thermal shutdown circuit that forces the driver outputs into a high impedance state. Enhanced ESD protection allows the LTC1484 to with- stand ±15kV (human body model), IEC-1000-4-2 level 4 ( ±8kV) contact and level 3 (±8kV) air discharge ESD without latchup or damage. The LTC1484 is fully specified over the commercial and industrial temperature ranges and is available in 8-lead MSOP, PDIP and SO packages. s Battery-Powered RS485/RS422 Applications s Low Power RS485/RS422 Transceiver s Level Translator , LTC and LT are registered trademarks of Linear Technology Corporation. RO1 RE1 DE1 DI1 R VCC1 LTC1484 GND1 B1 A1 B2 A2 120 Ω 120 Ω D VCC2 GND2 1484 TA01 R D RO2 RE2 DE2 DI2 LTC1484 RS485 Interface APPLICATIO S FEATURES TYPICAL APPLICATIO DESCRIPTIO Driving a 2000 Foot STP Cable Dl1 ↑↓ DE1 = VCC 1484 TA01a Dl2 = 0 DE2 = 0 RE1 = RE2 = 0 Dl1 B2 A2 RO2 |
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