LTC1484

Features:

* 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
* Guaranteed High Receiver Output State for Floating, Shorted or Terminated Inputs
    with No Signal Present
* Drives Low Cost Residential Telephone Wires
* Low Power: ICC = 700µA Max with Driver Disabled
* ICC = 900µA Max for Driver Enable with No Load
* 20µA Max Quiescent Current in Shutdown Mode
* Single 5V Supply
* 7V to 12V Common Mode Range Permits ±7V Ground Difference Between Devices
    on the Data Line
* Power Up/Down Glitch-Free Driver Outputs
* Up to 32 Transceivers on the Bus
* Pin Compatible with the LTC485
*Available in 8-Lead MSOP, PDIP and SO Packages 


Application

* Battery-Powered RS485/RS422 Applications
* Low Power RS485/RS422 Transceiver
*  Level Translator


Specifications

Supply Voltage (VCC) ...............................................  6.5V
Control Input Voltages .................  0.3V to (VCC + 0.3V)
Driver Input Voltage .....................  0.3V to (VCC + 0.3V)
Driver Output Voltages .................................  7V to 10V
Receiver Input Voltages (Driver Disabled) ..  12V to 14V
Receiver Output Voltage ...............  0.3V to (V  + 0.3V)
Junction Temperature ..........................................  125°C
Operating Temperature Range
LTC1484C ......................................... 0°C TA 70°C
LTC1484I ....................................  40°C TA 85°C
Storage Temperature Range .............  65°C to 150°C
Lead Temperature (Soldering, 10 sec) ................  300°C


Description

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 common mode range when three-stated. Excessive power dissipation caused by bus contention or faults is prevented by a thermal shut -down circuit that forces the driver outputs into a high impe dance state.

Enhanced ESD protection allows the LTC1484 to withstand ±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.