SP3070E Datasheet, PDF (8/20 Pages) Exar Corporation – ±15kV ESD-Protected, 3.3V, 1/8 Load, Failsafe RS-485/RS422 Transceivers

figure 1. driver dc test circuit
figure 2. receiver dc test circuit
DI
D
0 or 3V
VCC
R/2
VOD
R/2 _VOC
A
OUT
VID _B R
RE
figure 3. Driver propagation delay time test circuit and timing dia-
gram
Y
DI _D
VOD
Z
3.3V
RL CL
54Ω 50pF
V_CC
DI ₀
Z
Y
V_O
V_DIFF
-V_O
V_CC/2
t_PLH
t_PHL
V_O
1/2 V_O
10%
t_R
V_DIFF = V(Y) - V(Z)
90%
90%
V_SKEW = t_{PLH -} t_PHL
1/2 V_O
10%
t_F
Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 510-668-7017 • www.exar.com
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SP3070E-SP3078E_100_061109