MAX221E View Datasheet(PDF) - Maxim Integrated
Part Name
Description
Manufacturer
MAX221E Datasheet PDF : 12 Pages
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±15kV ESD-Protected, +5V, 1µA, Single RS-232
Transceiver with AutoShutdown
RC 1MΩ
CHARGE-CURRENT
LIMIT RESISTOR
HIGH-
VOLTAGE
DC
SOURCE
Cs
100pF
RD 1500Ω
DISCHARGE
RESISTANCE
STORAGE
CAPACITOR
DEVICE
UNDER
TEST
RC 50MΩ to 100MΩ
RD 330Ω
CHARGE-CURRENT
LIMIT RESISTOR
DISCHARGE
RESISTANCE
HIGH-
VOLTAGE
DC
SOURCE
Cs
150pF
STORAGE
CAPACITOR
DEVICE
UNDER
TEST
Figure 5a. Human Body ESD Test Model
Figure 6a. IEC 1000-4-2 ESD Test Model
IP 100%
90%
AMPERES
36.8%
10%
0
0 tRL
Ir
PEAK-TO-PEAK RINGING
(NOT DRAWN TO SCALE)
TIME
tDL
CURRENT WAVEFORM
Figure 5b. Human Body Model Current Waveform
I
100%
90%
10%
tr = 0.7ns to 1ns
t
30ns
60ns
Figure 6b. IEC 1000-4-2 ESD Generator Current Waveform
the ESD that withstands voltage measured to IEC 1000-
4-2 is generally lower than that measured using the
Human Body Model. Figure 6a shows the IEEE 1000-4-
2 model and Figure 6b shows the current waveform for
the ±8kV IEC 1000-4-2 Level 4 ESD Contact-Discharge
test.
The Air-Gap Method involves approaching the device
with a charged probe. The Contact-Discharge Method
connects the probe to the device before the probe is
energized.
Machine Model
The Machine Model for ESD tests all pins, using a
200pF storage capacitor and zero discharge resis-
tance. Its objective is to emulate the stress caused not
only by RS-232 inputs and outputs, but also by contact
that occurs due to handling and assembling during
manufacturing. Therefore, after PC board assembly, the
Machine Model is less relevant to I/O ports.
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