±15kV ESD-Protected, Slew-Rate-Limited,
Low-Power, RS-485/RS-422 Transceivers
MAX481E/MAX483E/MAX485E/MAX487E–MAX491E/MAX1487E
R
C
1M
CHARGE CURRENT
LIMIT RESISTOR
HIGH
VOLTAGE
DC
SOURCE
R
D
1500Ω
DISCHARGE
RESISTANCE
DEVICE
UNDER
TEST
I
P
100%
90%
AMPERES
36.8%
10%
0
0
t
RL
TIME
t
DL
CURRENT WAVEFORM
Ir
PEAK-TO-PEAK RINGING
(NOT DRAWN TO SCALE)
Cs
100pF
STORAGE
CAPACITOR
Figure 4. Human Body ESD Test Model
Figure 5. Human Body Model Current Waveform
I
100%
R
C
50M to 100M
CHARGE CURRENT
LIMIT RESISTOR
HIGH-
VOLTAGE
DC
SOURCE
R
D
330Ω
I
PEAK
DISCHARGE
RESISTANCE
DEVICE
UNDER
TEST
10%
t r = 0.7ns to 1ns
t
30ns
60ns
90%
Cs
150pF
STORAGE
CAPACITOR
Figure 6. IEC1000-4-2 ESD Test Model
Figure 7. IEC1000-4-2 ESD Generator Current Waveform
Y
R
V
OD
R
Z
V
OC
S2
TEST POINT
RECEIVER
OUTPUT
C
RL
15pF
1k
V
CC
S1
1k
Figure 8. Driver DC Test Load
Figure 9. Receiver Timing Test Load
10
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MAXIM [ MAXIM INTEGRATED PRODUCTS ]
