ꢀ ꢁ ꢂ ꢃꢄꢄ
ꢅꢆ ꢇ ꢀ ꢈꢉꢊ ꢋ ꢌ ꢍꢁ ꢎ ꢎꢏꢉ ꢐꢑ ꢆꢃ ꢒ ꢃ ꢉꢋ ꢎ ꢏ ꢓꢐ ꢋ ꢇꢏ ꢐꢔꢐꢏ ꢌꢏꢋ ꢇꢏꢐ
ꢕꢋ ꢊ ꢍ ꢄ ꢅꢆ ꢖꢇ ꢏꢑ ꢓ ꢗ ꢐꢘ ꢊꢏ ꢌꢊꢋ ꢘ ꢎ
SLLS567E − MAY 2003 − REVISED JANUARY 2004
APPLICATION INFORMATION
1.5
V
= 2 kV
HBM
DUT = 10 V, 1-Ω Zener Diode
1.0
0.5
0.0
0
50
100
Time − ns
150
200
Figure 8. Typical HBM Current Waveform
Machine Model
The Machine Model (MM) ESD test applies to all pins, using a 200-pF capacitor with no discharge resistance.
The purpose of the MM test is to simulate possible ESD conditions that can occur during the handling and
assembly processes of manufacturing. In this case, ESD protection is required for all pins, not just RS-232 pins.
However, after PC board assembly, the MM test no longer is as pertinent to the RS-232 pins.
12
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