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XR3170E Datasheet, PDF (11/24 Pages) Exar Corporation – 3.3V High Speed RS-485/RS-422 TRANSCEIVERS WITH 1/8 UNIT LOAD | |||
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REV. 1.0.0
XR3170E-3178E
3.3V HIGH SPEED RS-485/RS-422 TRANSCEIVERS WITH 1/8th UNIT LOAD
FIGURE 6. DRIVER PROPAGATION DELAY TEST CIRCUIT
Y
DI D
VOD
Z
3.3V
RL
CL
54⦠50pF
FIGURE 7. DRIVER PROPAGATION DELAY TIMING DIAGRAM
Vcc
DI
0V
Z
Y
VDIFF
VY â VZ
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 8. DRIVER ENABLE AND DISABLE TIME TEST CIRCUIT 1
0 or Vcc DI
Y
D
Z
S1
CL = 50pF
GENERATOR
50â¦
OUT
RL = 500â¦
11
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