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ST485ERXD-ST485ERXDR-ST485ERXN
LOW POWER RS-485/RS422 TRANSCEIVER
1/13September 2003 LOW QUIESCENT CURRENT: 300μA DESIGNED FOR RS-485 INTERFACE
APPLICATIONS -7V TO 12V COMMON MODE INPUT
VOLTAGE RANGE DRIVER MAINTAINS HIGH IMPEDANCEIN
3-STATE ORWITHTHE POWER OFF 70mV TYPICAL INPUT HYSTERESIS 30ns PROPAGATION DELAYS, 5ns SKEW OPERATE FROMA SINGLE 5V SUPPLY CURRENT LIMITING AND THERMAL
SHUTDOWN FOR DRIVER OVERLOAD
PROTECTION ESD PROTECTION:
±15KV (H.B.M.)
±8KV (IEC-1000-4-2 CONTACT
DISCHARGE) ALLOWS UP TO 256 TRANSCEIVERS ON
THE BUS
DESCRIPTIONThe ST485Eis al low power transceiver for
RS-485 and RS-422 communication. Each driver
output and receiver inputis protected against
±15KV electrostatic discharge (H.B.M.) ±8KV
(IEC-1000-4-2 contact discharge) shocks, without
latchup. These parts contain one driver and one
receiver.
This transceiver draws 300μA (typ.)of supply
current when unloaded or fully loaded with
disabled drivers. operates froma single 5V supply.
Driver is short-circuit current limited and is
protected against excessive power dissipationby
thermal shutdown circuitry that places the driver
outputs intoa high-impedance state.
The ST485Eis designed for bi-directional data
communications on multipoint bus transmission
line (half-duplex applciations).
ORDERING CODES
ST485ER±15KV ESD PROTECTED, LOW POWER
RS-485/RS-422 TRANSCEIVER
ST485ER2/13
PIN CONFIGURATION
PIN DESCRIPTION
TRUTH TABLE (DRIVER) Don’t Care; Z=High Impedance
TRUTH TABLE (RECEIVER) Don’t Care; Z=High Impedance
ABSOLUTE MAXIMUM RATINGSAbsoluteMaximum Ratingsare those values beyond which damagetothe device may occur. Functional operation under these conditionis
not implied.
ST485ER3/13
ESD PERFORMANCE: TRANSMITTER OUTPUTS, RECEIVER INPUTS ELECTRICAL CHARACTERISTICSCC =5V ± 5%,TA =T MINtoT MAX, unless otherwise specified. Typical values are referredtoTA= 25°C)
(See Note1)
Note1:All currentsinto device pinsare positive;all cuttentsoutof device pinsare negative;all voltagesare referencedto device ground
unless specified.
Note2: Supply current specificationis validfor loaded transmitters when VDE =0V
Note3: Appliesto peak current. See typical Operating Characteristics.
ST485ER4/13
DRIVER SWITCHING CHARACTERISTICS(VCC =5V ± 5%,TA =TMINto TMAX, unless otherwise specified. Typical values are referredtoTA =25°C)
(See Note1)
Note1:All currentsinto device pinsare positive;all cuttentsoutof device pinsare negative;all voltagesare referencedto device ground
unless specified.
RECEIVER SWITCHING CHARACTERISTICS(VCC =5V ± 5%,TA =TMINto TMAX, unless otherwise specified. Typical values are referredtoTA= 25°C)
(See Note1)
Note1:All currentsinto device pinsare positive;all cuttentsoutof device pinsare negative;all voltagesare referencedto device ground
unless specified.
ST485ER5/13
TEST CIRCUITS AND TYPICAL CHARACTERISTICS
ST485ER6/13
Figure5: Driver Propagation Delay
Figure6: Driver Enable and Disable Time
ST485ER7/13
Figure7: Receiver Propagation Delay
Figure8: Receiver Enable and Disable Time
