MAX14895E Datasheet, PDF (9/11 Pages) Maxim Integrated Products – Enhanced VGA Port Protector DDC Outputs have Internal Pullups

MAX14895E
Enhanced VGA Port Protector
ESD protection can be tested in various ways. The RED,
GRN, BLU, EN, V_S, SYNCH1, SYNCV1, SCL1, and SDA1
terminals of the device are characterized for protection to
the following limits:
• Q15kV using the HBM
• Q8kV using IEC 61000-4-2 Contact Discharge
Human Body Model
Figure 2 shows the HBM. Figure 3 shows the current
waveform it generates when discharged into a low-
impedance state. This model consists of a 100pF capaci-
tor charged to the ESD voltage of interest that is then
discharged into the device through a 1.5kI resistor.
IEC 61000-4-2
The IEC 6100-4-2 standard covers ESD testing and per-
formance of finished equipment. However, it does not
specifically refer to integrated circuits. The device assists
in designing equipment to meet IEC 61000-4-2 without
the need for additional ESD protection components.
The major difference between tests done using the HBM
and IEC 61000-4-2 is higher peak current in IEC 61000-
4-2 because series resistance is lower in the IEC 61000-
4-2 model. Hence, the ESD withstand voltage measured
to IEC 61000-4-2 is generally lower than that measured
using the HBM. Figure 4 shows the IEC 61000-4-2 model,
and Figure 5 shows the current waveform for the IEC
61000-4-2 ESD Contact Discharge test.
R_C
R_D
1MΩ
1.5kΩ
CHARGE-CURRENT-
LIMIT RESISTOR
DISCHARGE
RESISTANCE
HIGH-
VOLTAGE
DC
SOURCE
CS
100pF
STORAGE
CAPACITOR
DEVICE
UNDER
TEST
R_C
50MΩ TO 100MΩ
R_D
330Ω
CHARGE-CURRENT- DISCHARGE
LIMIT RESISTOR
RESISTANCE
HIGH-
VOLTAGE
DC
SOURCE
CS
150pF
STORAGE
CAPACITOR
DEVICE
UNDER
TEST
Figure 2. Human Body ESD Test Model
IPEAK (AMPS)
100%
90%
Ir
PEAK-TO-PEAK RINGING
(NOT DRAWN TO SCALE)
36.8%
10%
0
TIME
0 _tRL
tDL
Figure 3. Human Body Current Waveform
Figure 4. IEC 61000-4-2 ESD Test Model
IPEAK (AMPS)
100%
90%
10%
t
t_R = 0.7ns TO 1ns
30ns
60ns
Figure 5. IEC 61000-4-2 ESD Generator Current Waveform
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