MAX13442E Datasheet, PDF (8/18 Pages) Maxim Integrated Products – ±15kV ESD-Protected, ±80V Fault-Protected, Fail-Safe RS-485/J1708 Transceivers

±15kV ESD-Protected, ±80V Fault-Protected,
Fail-Safe RS-485/J1708 Transceivers
Test Circuits and Waveforms
A
DI
D
B
V_CC
R_L
2
V_OD
R_L
2
V_OC
Figure 1. Driver V_OD and V_OC
A
V_ID
R
RO
B
0
V_OL
I_OL
V_OH
I_OH
(+)
(-)
Figure 2. Receiver V_OH and V_OL
GENERATOR
(NOTE 4)
A
DI
S1
D
B
50Ω
V_CC
V_OM
R_L
2
OUT
C_L = 50pF
(NOTE 5)
V_OM =
V_OH + V_OL
2
≈ 1.5V
Figure 3. Driver Propagation Times
3V
DI
1.5V
1.5V
0V
t_PLHA
t_PHLA
V_OH
A
V_OM
V_OM
V_OL
t_PHLB
t_PLHB
B
V_OM
V_OH
V_OM
V_OL
A
C_L
DI
D
GENERATOR
(NOTE 4)
B
50Ω
V_CC
C_L
OUT
R_L
C_L = 50pF (NOTE 5)
Figure 4. Driver Differential Output Delay and Transition Times
1.5V
DI
t_DPLH
(A–B)
90%
50%
10%
t_LH
1.5V
t_DPHL
90%
50%
10%
t_HL
3V
0V
≈ 2.0V
≈ -2.0V
8 _______________________________________________________________________________________