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| SP339EER1-0A Datasheet, PDF (15/23 Pages) Exar Corporation – RS-232/RS-485/RS-422 TRANSCEIVER WITH INTERNAL TERMINATION | |||
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REV. 1.0.4
TEST CIRCUITS
SP339E
RS-232/RS-485/RS-422 TRANSCEIVER WITH INTERNAL TERMINATION
FIGURE 5. RS-485/422 RECEIVER TERMINATION RESISTANCE
RTERM = 2 (VA ÚVB)
IA ÚIB
B
IB
TERM = VCC
±2V
RTERM
Rx
-7V ݪVA, VB ݪ+12V
IA
A
Termination is enabled in RS-485/422 modes when the TERM pin is held high (VCC).
FIGURE 6. RS-485/422 DIFFERENTIAL DRIVER OUTPUT VOLTAGE
Tx Input = 0V or VCC
Tx
VOD
Tx Enable = VCC
B
RL
2
VCM
RL
2
A
FIGURE 7. RS-485/422 DIFFERENTIAL DRIVER OUTPUT VOLTAGE OVER COMMON MODE
B
Tx Input = 0V or VCC
Tx
375Ì¢
VOD 60Ì¢
VCM
375Ì¢
Tx Enable = VCC
A
FIGURE 8. RS-485/422 DRIVER OUTPUT SHORT CIRCUIT CURRENT
B
Tx Input = 0V or VCC
Tx
Tx Enable = 0V or VCC
IOSD
-7V to +12V V
A
15
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