特点
No Damage or Latchup to ±15kV ESD (Human
Body Model), IEC-1000-4-2 Level 4 Contact (±8kV)
and Level 3 (
Guaranteed High Receiver Output State for Floating,
Shorted or Terminated Inputs with No Signal
Present
Drives Low Cost Residential Telephone Wires
Low Power: I
CC
= 700μA Max with Driver Disabled
I
CC
= 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
典型应用
描述
描述 The LTC?1484 is a low power RS485 compatible transceiver. 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 shutdown circuit that forces the driver outputs into a high impedance 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.