MAX3224E Maxim, MAX3224E Datasheet - Page 12

• Manufacturer Part Number: MAX3224E
• Description: 15kV ESD-Protected / 1A / 1Mbps / 3.0V to 5.5V / RS-232 Transceivers with AutoShutdown Plus
• Manufacturer: Maxim

ESD protection can be tested in various ways; the
transmitter outputs and receiver inputs of this product
family are characterized for protection to the following
limits:
1) ±15kV using the Human Body Model
2) ±8kV using the contact-discharge method specified
3) ±15kV using IEC1000-4-2’s air-gap method.
ESD performance depends on a variety of conditions.
Contact Maxim for a reliability report that documents
test setup, test methodology, and test results.
Figure 6a shows the Human Body Model and Figure 6b
shows the current waveform it generates when dis-
charged into a low impedance. This model consists of
±15kV ESD-Protected, 1µA, 1Mbps, 3.0V to 5.5V,
RS-232 Transceivers with AutoShutdown Plus
Figure 6a. Human Body ESD Test Model
12
Figure 6b. Human Body Current Waveform
VOLTAGE
SOURCE
AMPERES
in IEC1000-4-2
HIGH-
DC
______________________________________________________________________________________
I
P
36.8%
100%
90%
10%
CHARGE-CURRENT
LIMIT RESISTOR
0
0
R
C
t
100pF
RL
1M
C s
STORAGE
CAPACITOR
R
CURRENT WAVEFORM
RESISTANCE
D
DISCHARGE
TIME
1500
t
DL
I r
ESD Test Conditions
Human Body Model
PEAK-TO-PEAK RINGING
(NOT DRAWN TO SCALE)
DEVICE
UNDER
TEST
a 100pF capacitor charged to the ESD voltage of inter-
est, which is then discharged into the test device
through a 1.5kΩ resistor.
The IEC1000-4-2 standard covers ESD testing and per-
formance of finished equipment; it does not specifically
refer to integrated circuits. The MAX3224E–MAX3227E,
MAX3244E/MAX3245E help you design equipment that
meets Level 4 (the highest level) of IEC1000-4-2, with-
out the need for additional ESD-protection components.
The major difference between tests done using the
Human Body Model and IEC1000-4-2 is higher peak
current in IEC1000-4-2, because series resistance is
Figure 7a. IEC1000-4-2 ESD Test Model
Figure 7b. IEC1000-4-2 ESD Generator Current Waveform
VOLTAGE
SOURCE
HIGH-
t r = 0.7ns to 1ns
DC
CHARGE CURRENT
LIMIT RESISTOR
100%
90%
10%
R
C
I
50M to 100M
150pF
C s
30ns
STORAGE
CAPACITOR
R
RESISTANCE
DISCHARGE
D
330
60ns
IEC1000-4-2
DEVICE
UNDER
TEST
t