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)
TERM = 0V,
RIN
Receiver Input Resistance
96
kΩ
-7V ≤ VIN ≤ +12V
Receiver Differential Threshold
Voltage
VTH
-200
-125
25
-50
mV
∆VTH
VCM = 0V
VIN = +12V
VIN = -7V
Receiver Input Hysteresis
mV
µA
µA
125
IIN
Receiver Input Current
-100
TERM = VCC, Figure 5
RTERM
Termination Resistance
Termination Resistance
100
100
120
120
155
140
Ω
Ω
-7V ≤ VCM ≤ +12V
TERM = VCC, Figure 5
VCM = 0V
RTERM
DIFFERENTIAL DRIVER OUTPUTS (RS-485 / RS-422)
VCC
VCC
VCC
VCC
RL = 100Ω (RS-422), Figure 6
RL = 54Ω (RS-485), Figure 6
VCM = -7V, Figure 7
2
V
V
V
V
1.5
1.5
1.5
VOD
Differential Driver Output
VCM = +12V, Figure 7
Change In Magnitude of
Differential Output Voltage
∆VOD
VCM
RL = 54Ω or 100Ω, Figure 6
RL = 54Ω or 100Ω, Figure 6
RL = 54Ω or 100Ω, Figure 6
-7V ≤ VO ≤ +12V, Figure 8
-0.2
+0.2
3
V
V
Driver CommonMode Output Voltage
Change In Magnitude of
∆VCM
IOSD
0.2
V
Common Mode Output Voltage
Driver Output Short Circuit Current
Driver Output Leakage Current
±250
mA
DIR1 = 0V in Mode 11,
or ENABLE = 0V,
-7V ≤ VO ≤ +12V
IO
±100
µA
7
EXAR [ EXAR CORPORATION ]
