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ST3485EBD-ST3485EBDR-ST3485EBN-ST3485ECD-ST3485ECDR-ST3485ECN
3.3V POWERED, 15KV ESD PROTECTED, TRANSMIT ANT UP TO 12MBPS TRUE RS-485/RS-422 TRANSCEIVER
1/16October 2002 ESD PROTECTION:
±15KV HUMAN BODY MODEL
±8KV IEC 1000-4-2 CONTACT DISCHARGE OPERATE FROMA SINGLE 3.3V SUPPLY- CHARGE PUMP REQUIRED INTEROPERABLE WITH 5V LOGIC 1μA LOW CURRENT SHUTDOWN MODE
MAX GUARANTEED12 Mbps DATA RATE -7 TO12 COMMON MODE INPUT VOLTAGE
RANGE HALF DUPLEX VERSIONS AVAILABLE INDUSTRY STANDARD 75176 PINOUT CURRENT LIMITING AND THERMAL
SHUTDOWN FOR DRIVER OVERLOAD
PROTECTION GUARANTEED HIGH RECEIVER OUTPUT
STATE FOR FLOATING INPUTS WITH NO
SIGNAL PRESENT ALLOW UP TO64 TRANSCEIVERS ON THE
BUS
DESCRIPTION

The ST3485Eis ±15kV ESD protected, 3.3V low
power transceiver for RS-485 and RS-422
communications. The device contains one driver
and one receiverin half duplex configuration. The
ST3485E transmit and receiveat guaranteed data
rateat leastto 12Mbps.
All transmitter outputs and receiver inputs are
protectedto ±15kV using Human Body Model.
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 ST3485E input hasa true fail-safe feature
that guaranteesa logic high outputif both inputs
are open circuit, shorted togetherorin presenceof
the termination withno signalon the bus.
ORDERING CODES
ST3485E

3.3V POWERED, 15KV ESD PROTECTED, TRASMIT AT TO 12MBPS TRUE RS-485/RS-422 TRANSCEIVER
ST3485E
2/16
PIN CONFIGURATION
PIN DESCRIPTION
TRUTH TABLE (DRIVER)
Don’t Care; Z=High Impedance
TRUTH TABLE (RECEIVER)
Don’t Care; Z=High Impedance
ST3485E
3/16
ABSOLUTE MAXIMUM RATINGS

AbsoluteMaximum Ratingsare those values beyond which damagetothe device may occur. Functional operation under these conditionis
not implied.
ESD PERFORMANCE: TRANSMITTER OUTPUTS, RECEIVER INPUTS
ELECTRICAL CHARACTERISTICS

VCC =3V to3.6V,TA= -40to 85°C, unless otherwise specified. Typical values are referredtoTA= 25°C)
LOGIC INPUT ELECTRICAL CHARACTERISTICS

VCC =3V to3.6V,TA= -40to 85°C, unless otherwise specified. Typical values are referredtoTA= 25°C)
ST3485E
4/16
TRANSMITTER ELECTRICAL CHARACTERISTICS

VCC =3Vto 3.6V,TA= -40to 85°C, unless otherwise specified. Typical values are referredtoTa =25°C)
RECEIVER ELECTRICAL CHARACTERISTICS
CC =3Vto 3.6V,TA= -40to 85°C, unless otherwise specified. Typical values are referredtoTa =25°C)
ST3485E
5/16
DRIVER SWITCHING CHARACTERISTICS

VCC =3Vto 3.6V,TA= -40to 85°C, unless otherwise specified. Typical values are referredtoTa =25°C)
RECEIVER SWITCHING CHARACTERISTICS

VCC =3Vto 3.6V,TA= -40to 85°C, unless otherwise specified. Typical values are referredtoTa= 25°C)
Note1: ΔVOD and ΔVOCarethe changesin VOD and VOC, respectively, whentheDI input changes state.
Note2: measuredon |tPLH(A)-tPHL(A)| and |tPLH(B)-tPHL(B)|
Note3: The transceiversareputinto shutdownby bringRE high andDE low.Ifthe inputarein statefor less than 80ns,the partare guaren-
teednotto enter shutdown.Ifthe inputsareinthis stateforat least 300ns,the partsare guarenteedto have entered shutdown.
ST3485E
6/16
TEST CIRCUITS AND TYPICAL CHARACTERISTICS
Figure1:
Driver andVOC Test Load
Figure2:
DriverVOD with Varying Common Mode Voltage Test Load
Figure3:
Receiver VOH and VOL Test Circuit
ST3485E
7/16
Figure4:
Drive Differential Output Delay Transition Time Test Circuit
Figure5:
Drive Differential Output Delay Transition Time Waveform
Figure6:
Drive Enable and Disable Times Test Circuit
ST3485E
8/16
Figure7:
Drive Enable and Disable Times Waveforms
Figure8:
Drive Propagation Time Test Circuit
Figure9:
Drive Propagation Time Waveform
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