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SP335E Datasheet(PDF) 13 Page - Exar Corporation

Part # SP335E
Description  TRANSCEIVER WITH INTERNAL TERMINATION
PDF  23 Pages
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Manufacturer  EXAR [Exar Corporation]
Direct Link  http://www.exar.com
Logo EXAR - Exar Corporation

SP335E Datasheet(HTML) 13 Page - Exar Corporation

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FIGURE 4. RS-485/422 RECEIVER TERMINATION RESISTANCE
IB
±2V
Rx
IA
B
A
RTERM
RTERM =2(VA – VB)
IA – IB
-7V ≤ VA,VB ≤ +12V
Termination is enabled when both TERM and RS-485/RS-232 are logic high.
FIGURE 5. RS-485/422 DIFFERENTIAL DRIVER OUTPUT VOLTAGE
D
VOD
VCM
DE = VL
DI=0VorVL
Z
Y
RL
2
RL
2
FIGURE 6. RS-485/422 DIFFERENTIAL DRIVER OUTPUT VOLTAGE OVER COMMON MODE
D
VOD
VCM
60Ω
375Ω
375Ω
Z
Y
DE = VL
DI=0VorVL
FIGURE 7. RS-485/422 DRIVER OUTPUT SHORT CIRCUIT CURRENT
D
-7V to +12V
V
Z
Y
IOSD
DE = 0V or VL
DI=0VorVL
SP335E
13
REV. 1.0.2
RS-232/RS-485/RS-422 TRANSCEIVER WITH INTERNAL TERMINATION
TEST CIRCUITS



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