RS-232(2011) データシートの表示（PDF） - Exar Corporation

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RS-232
(Rev.:2011)

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

Exar Corporation 

SP339E

REV. 1.0.0

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

ELECTRICAL CHARACTERISTICS (Continued)

UNLESS OTHERWISE NOTED:

VCC = +3.3V ±5% or +5.0V ±5%, C1-C4 = 0.1µF; 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

96

VTH

∆VTH

Receiver Differential Threshold

Voltage

Receiver Input Hysteresis

-200

IIN

Receiver Input Current

RTERM Termination Resistance

100

RTERM Termination Resistance

100

-125

25

120

120

-50

125

-100

155

140

TERM = 0V,

kΩ -7V ≤ VIN ≤ +12V

mV

mV VCM = 0V

µA VIN = +12V

µA VIN = -7V

Ω TERM = VCC, Figure 5

-7V ≤ VCM ≤ +12V

Ω TERM = VCC, Figure 5

VCM = 0V

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

2

1.5

VOD

Differential Driver Output

1.5

1.5

∆VOD

VCM

∆VCM

Change In Magnitude of

-0.2

Differential Output Voltage

Driver CommonMode Output Voltage

Change In Magnitude of

Common Mode Output Voltage

IOSD

Driver Output Short Circuit Current

IO

Driver Output Leakage Current

VCC

V RL = 100Ω (RS-422), Figure 6

VCC

V RL = 54Ω (RS-485), Figure 6

VCC

V VCM = -7V, Figure 7

VCC

V VCM = +12V, Figure 7

+0.2 V RL = 54Ω or 100Ω, Figure 6

3

V RL = 54Ω or 100Ω, Figure 6

0.2

V RL = 54Ω or 100Ω, Figure 6

±250

±100

mA -7V ≤ VO ≤ +12V, Figure 8

DIR1 = 0V in Mode 11,

µA or ENABLE = 0V,

-7V ≤ VO ≤ +12V

7

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