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SP336EEY-L-TR Datasheet, PDF (17/30 Pages) Exar Corporation – 3.3V / 5V PROGRAMMABLE RS-232/RS-485/RS-422 SERIAL TRANSCEIVER | |||
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REV. 1.0.1
SP336E
3.3V / 5V PROGRAMMABLE RS-232/RS-485/RS-422 SERIAL TRANSCEIVER
FIGURE 7. RS-485 DRIVER PROPAGATION DELAY TEST CIRCUIT
A
DI Tx
VOD
B
3.3V
RL
CL
54Ω 50pF
FIGURE 8. RS-485 DRIVER TIMING DIAGRAM
Vcc
DI
0V
B
A
VDIFF
VA â VB
VO+
0V
VOâ
Vcc/2
VO 1/2VO
tPLH
tPHL
Vcc/2
1/2VO
tDPLH
90%
10%
tR
tDPHL
t SKEW = |t DPLH - tDPHL|
90%
10%
tF
FIGURE 9. RS-485 DRIVER ENABLE AND DISABLE TEST CIRCUIT
A S1
Vcc DI Tx
B
CL = 50pF
GENERATOR
50Ω
OUT
RL = 500Ω
17
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