MAX3233E-MAX3235E MAXIM [Maxim Integrated Products], MAX3233E-MAX3235E Datasheet - Page 9

• Manufacturer Part Number: MAX3233E-MAX3235E
• Manufacturer: MAXIM [Maxim Integrated Products]

event, Maxim’s E versions keep working without
latchup, whereas competing RS-232 products can
latch and must be powered down to remove latchup.
Figure 4. AutoShutdown Plus Initial Turn-On to Wake Up
Another System
Figure 5a. Human Body ESD Test Model
Figure 5b. Human Body Current Waveform
±15kV ESD-Protected, 1µA, 250kbps, 3.3V/5V, Dual
VOLTAGE
SOURCE
AMPERES
HIGH-
DC
MANAGEMENT
RS-232 Transceivers with Internal Capacitors
I
POWER-
P
36.8%
UNIT
100%
CHARGE-CURRENT
90%
10%
LIMIT RESISTOR
0
0
R
C
100pF
t
1M
RL
C s
_______________________________________________________________________________________
MASTER SHDN LINE
STORAGE
CAPACITOR
R
RESISTANCE
D
DISCHARGE
CURRENT WAVEFORM
TIME
1500
FORCEOFF
t
DL
MAX3233E
MAX3235E
I r
0.1µF
FORCEON
PEAK-TO-PEAK RINGING
(NOT DRAWN TO SCALE)
1M
DEVICE
UNDER
TEST
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 IEC 1000-4-2’s Air-Gap Discharge
ESD performance depends on a variety of conditions.
Contact Maxim for a reliability report that documents
test setup, test methodology, and test results.
Figure 5a shows the Human Body Model and Figure 5b
shows the current waveform it generates when dis-
charged into a low impedance. This model consists of
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 IEC 1000-4-2 standard covers ESD testing and per-
formance of finished equipment; it does not specifically
refer to integrated circuits. The MAX3233E/MAX3235E
help you design equipment that meets Level 4 (the high-
est level) of IEC 1000-4-2, without the need for additional
ESD-protection components.
The major difference between tests done using the
Human Body Model and IEC 1000-4-2 is higher peak cur-
rent in IEC 1000-4-2, because series resistance is lower
in the IEC 1000-4-2 model. Hence, the ESD withstand
voltage measured to IEC 1000-4-2 is generally lower than
Figure 6a. IEC 1000-4-2 ESD Test Model
VOLTAGE
in IEC 1000-4-2
method
SOURCE
HIGH-
DC
CHARGE CURRENT
LIMIT RESISTOR
R
C
50M to 100M
150pF
C s
STORAGE
CAPACITOR
R
RESISTANCE
DISCHARGE
D
330
ESD Test Conditions
Human Body Model
IEC 1000-4-2
DEVICE
UNDER
TEST
9