1/13September 2003
a73 LOW QUIESCENT CURRENT: 300µA
a73 DESIGNED FOR RS-485 INTERFACE
APPLICATIONS
a73 -7V TO 12V COMMON MODE INPUT
VOLTAGE RANGE
a73 DRIVER MAINTAINS HIGH IMPEDANCE IN
3-STATEORWITHTHEPOWEROFF
a73 70mV TYPICAL INPUT HYSTERESIS
a73 30ns PROPAGATION DELAYS, 5ns SKEW
a73 OPERATE FROM A SINGLE 5V SUPPLY
a73 CURRENT LIMITING AND THERMAL
SHUTDOWN FOR DRIVER OVERLOAD
PROTECTION
a73 ESD PROTECTION:
±15KV (H.B.M.)
±8KV (IEC-1000-4-2 CONTACT
DISCHARGE)
a73 ALLOWS UP TO 64 TRANSCEIVERS ON
THE BUS
DESCRIPTION
The ST485E is al low power transceiver for
RS-485 and RS-422 communication. Each driver
output and receiver input is protected against
±15KV electrostatic discharge (H.B.M.) (ESD)
shocks, without latcup. These parts contain one
driver and one receiver in half duplex
configuration.
This transceiver draw 300µA (typ.) of supply
current when unloaded or fully loaded with
disabled drivers.
It operates from a single 5V supply.
Driver is short-circuit current limited and is
protected against excessive power dissipation by
thermal shutdown circuitry that place the driver
outputs into a high-impedance state.
The ST485E is designed for bi-directional data
communications on multipoint bus transmission
line (half-duplex applications).
ORDERING CODES
Type
Temperature
Range
Package Comments
ST485ECN 0 to 70 °C DIP-8 50parts per tube / 40tube per box
ST485EBN -40 to 85 °C DIP-8 50parts per tube / 40tube per box
ST485EXN -55 to 125 °C DIP-8 50parts per tube / 40tube per box
ST485ECD 0 to 70 °C SO-8 (Tube) 100parts per tube / 20tube per box
ST485EBD -40 to 85 °C SO-8 (Tube) 100parts per tube / 20tube per box
ST485EXD -55 to 125 °C SO-8 (Tube) 100parts per tube / 20tube per box
ST485ECDR 0 to 70 °C SO-8 (Tape & Reel) 2500 parts per reel
ST485EBDR -40 to 85 °C SO-8 (Tape & Reel) 2500 parts per reel
ST485EXDR -55 to 125 °C SO-8 (Tape & Reel) 2500 parts per reel
ST485E
±15KV ESD PROTECTED, LOW POWER
RS-485/RS-422 TRANSCEIVER
DIP SOP