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ST490ABDRSTN/a5200avaiLOW POWER HIGH SPEED RS-485/RS422 TRANSCEIVER
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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
DESCRIPTION

The 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
ST490A

LOW POWER HIGH SPEED RS-485/RS-422 TRANSCEIVER
ST490A
2/11
PIN CONFIGURATION
PIN DESCRIPTION
TRUTH TABLE (DRIVER)
Don’t Care; Z=High Impedance
TRUTH TABLE (RECEIVER)
Irrelevant; Z=High Impedance
ABSOLUTE MAXIMUM RATINGS

AbsoluteMaximum Ratingsare those values beyond which damagetothe device may occur. Functional operation under these conditionis
not implied.
ST490A
3/11
ELECTRICAL CHARACTERISTICS

VCC =4.5V to5.5V,TA= -40to 85°C, unless otherwise specified. Typicalvalues are referredtoTA =25°C)
TRANSMITTER ELECTRICAL CHARACTERISTICS
CC= 4.5Vto 5.5V,TA= -40 to85°C, unless otherwise specified. Typical values are referredtoTa= 25°C)
ST490A
4/11
RECEIVER ELECTRICAL CHARACTERISTICS

VCC= 4.5Vto 5.5V,TA= -40 to85°C, unless otherwise specified. Typical values are referredtoTa= 25°C)
DRIVER SWITCHING CHARACTERISTICS

VCC =4.5Vto 5.5V, TA= -40to 85°C, unless otherwise specified. Typical values are referredtoTa =25°C)
RECEIVER SWITCHING CHARACTERISTICS
CC =4.5V to5.5V,TA= -40to 85°C, unless otherwise specified.Typical values are referredtoTa= 25°C)
ST490A
5/11
TEST CIRCUITS AND TYPICAL CHARACTERISTICS
Figure1:
Driver DC Test Load
Figure2:
Driver/Receiver Timing Test Circuit
ST490A
6/11
Figure3:
Driver Propagation Delay
Figure4:
Receiver Propagation Delay
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