LTC485_06 Datasheet, PDF (1/12 Pages) Linear Technology – Low Power RS485 Interface Transceiver

LTC485
Low Power RS485
Interface Transceiver
FEATURES
■ _{Low Power: ICC = 300µA Typ}
■ _{Designed for RS485 Interface 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 Transceiver
■ _{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}
■ _{30ns Typical Driver Propagation Delays}
with 5ns Skew
■ _{Pin Compatible with ±60V Protected LT1785 and}
52Mbps LTC1685
U
APPLICATIO S
■ _{Low Power RS485/RS422 Transceiver}
■ _{Level Translator}
DESCRIPTIO
The LTC^®485 is a low power differential bus/line trans-
ceiver 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 of 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.
The LTC485 is fully specified over the commercial and
extended industrial temperature range.
, LTC and LT are registered trademarks of Linear Technology Corporation.
TYPICAL APPLICATIO
RO1
R
V_CC1
RE1
Rt
DE1
DI1
D
GND1
Rt
RO2
R
V_CC2
RE2
DE2
DI2
D
GND2
LTC485 • TA01
Driver Outputs
A
B
LTC485 • TA02
sn 485LTC485ffs
1