ST490ABDR ,LOW POWER HIGH SPEED RS-485/RS422 TRANSCEIVERELECTRICAL CHARACTERISTICSV = 4.5V to 5.5V, T = -40 to 85°C, unless otherwise specified. Typical va ..
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ST490ABDR-ST490ACDR-ST490ACN
LOW POWER HIGH SPEED RS-485/RS422 TRANSCEIVER
1/11November 2002 LOW SUPPLY CURRENT: 5mA MAX -7 TO12 COMMON MODE INPUT VOLTAGE
RANGE 70mV TYPICAL INPUT HYSTERESIS DESIGNED FOR 25Mbps OPERATION OPERATE FROM SINGLE5 SUPPLY ±4kV ESD PROTECTION CURRENT LIMITING AND THERMAL
SHUTDOWN FOR DRIVER OVERLOAD
PROTECTION
DESCRIPTIONThe ST490Aisa low power transceiver for
RS-485 and RS-422 communications. The device
contains one driver and one receiverin full duplex
configuration. The ST490A draws 5mA (typ.)of
supply current when unloadedor fully loaded with
disabled drivers.It operates froma single 5V
supply.
Driver is short-circuit current limited and is
protected against excessive power dissipationby
thermal shutdown circuitry that place the driver
outputs intoa high-impedance state. The receiver
input hasa fail-safe feature that guaranteesa
logic high outputif both inputs are open circuit.
ORDERING CODES
ST490ALOW POWER HIGH SPEED RS-485/RS-422 TRANSCEIVER
ST490A2/11
PIN CONFIGURATION
PIN DESCRIPTION
TRUTH TABLE (DRIVER) Don’t Care; Z=High Impedance
TRUTH TABLE (RECEIVER) Irrelevant; Z=High Impedance
ABSOLUTE MAXIMUM RATINGSAbsoluteMaximum Ratingsare those values beyond which damagetothe device may occur. Functional operation under these conditionis
not implied.
ST490A3/11
ELECTRICAL CHARACTERISTICSVCC =4.5V to5.5V,TA= -40to 85°C, unless otherwise specified. Typicalvalues are referredtoTA =25°C)
TRANSMITTER ELECTRICAL CHARACTERISTICSCC= 4.5Vto 5.5V,TA= -40 to85°C, unless otherwise specified. Typical values are referredtoTa= 25°C)
ST490A4/11
RECEIVER ELECTRICAL CHARACTERISTICSVCC= 4.5Vto 5.5V,TA= -40 to85°C, unless otherwise specified. Typical values are referredtoTa= 25°C)
DRIVER SWITCHING CHARACTERISTICSVCC =4.5Vto 5.5V, TA= -40to 85°C, unless otherwise specified. Typical values are referredtoTa =25°C)
RECEIVER SWITCHING CHARACTERISTICSCC =4.5V to5.5V,TA= -40to 85°C, unless otherwise specified.Typical values are referredtoTa= 25°C)
ST490A5/11
TEST CIRCUITS AND TYPICAL CHARACTERISTICS
Figure1: Driver DC Test Load
Figure2: Driver/Receiver Timing Test Circuit
ST490A6/11
Figure3: Driver Propagation Delay
Figure4: Receiver Propagation Delay
