SP339B datasheet(8/23 Pages) EXAR

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SP339B

RS-232/RS-485/RS-422 TRANSCEIVER WITH INTERNAL TERMINATION

REV. 1.0.0

ELECTRICAL CHARACTERISTICS (Continued)

UNLESS OTHERWISE NOTED:



VCC = +3.3V ±5% or +5.0V ±5%, C1-C4 = 0.1F; TA = TMIN to TMAX. Typical values are at VCC = 3.3V, TA = +25°C.

SYMBOL

PARAMETERS

MIN.

TYP.

MAX.

UNITS

CONDITIONS

DIFFERENTIAL RECEIVER INPUTS (RS-485 / RS-422)

RIN

Receiver Input Resistance



TERM = 0V,

-7V

VIN +12V

VTH

Receiver Differential

Threshold Voltage

-200

-125

-50

VTH

Receiver Input Hysteresis

VCM = 0V

IIN

Receiver Input Current

125

A

VIN = +12V

-100

A

VIN = -7V

RTERM

Termination Resistance

100

120

155



TERM = VCC, Figure 5

-7V

VCM +12V

RTERM

Termination Resistance

100

120

140



TERM = VCC, Figure 5

VCM = 0V

DIFFERENTIAL DRIVER OUTPUTS (RS-485 / RS-422)

VOD

Differential Driver Output

VCC

RL = 100 (RS-422), Figure 6

1.5

VCC

RL = 54 (RS-485), Figure 6

1.5

VCC

-7V

VCM +12V, Figure 7

VCC

No Load

VOD

Change In Magnitude of

Differential Output Voltage

-0.2

+0.2

RL = 54 or 100, Figure 6

VCM

Driver Common Mode Output Voltage

RL = 54 or 100, Figure 6

VCM

Change In Magnitude of

Common Mode Output Voltage

0.2

RL = 54 or 100, Figure 6

IOSD

Driver Output Short Circuit Current

-250

250

-7V

VO +12V, Figure 8

Driver Output Leakage Current

100

A

DIR1 = 0V in Mode 11,

or ENABLE = 0V,

VO +12V, VCC = 0V or 5.25V

-100

A

DIR1 = 0V in Mode 11,

or ENABLE = 0V,

VO -7V, VCC = 0V or 5.25V

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