±15kV ESD-Protected, 10Mbps, 3V/5V,
Quad RS-422/RS-485 Receivers
RC
1M
CHARGE-CURRENT
LIMIT RESISTOR
HIGH-
VOLTAGE
DC
SOURCE
Cs
100pF
RD
1.5k
DISCHARGE
RESISTANCE
STORAGE
CAPACITOR
Figure 4a. Human Body ESD Test Model
DEVICE
UNDER
TEST
IP 100%
90%
AMPERES
36.8%
10%
0
0 tRL
Ir
PEAK-TO-PEAK RINGING
(NOT DRAWN TO SCALE)
TIME
tDL
CURRENT WAVEFORM
Figure 4b. Human Body Model Current Waveform
RC
50M to 100M
CHARGE-CURRENT
LIMIT RESISTOR
HIGH-
VOLTAGE
DC
SOURCE
Cs
150pF
RD
330Ω
DISCHARGE
RESISTANCE
STORAGE
CAPACITOR
DEVICE
UNDER
TEST
Figure 5a. IEC 1000-4-2 ESD Test Model
I
100%
90%
10%
tr = 0.7ns to 1ns
30ns
t
60ns
Figure 5b. IEC 1000-4-2 ESD-Generator Current Waveform
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