MAX3243ECWI Maxim, MAX3243ECWI Datasheet - Page 10

• Manufacturer Part Number: MAX3243ECWI
• Description: 15kV ESD-Protected / 1A / 3.0V to 5.5V / 250kbps / RS-232 Transceivers with AutoShutdown
• Manufacturer: Maxim

As with all Maxim devices, ESD-protection structures are
incorporated on all pins to protect against electrostatic
discharges encountered during handling and assembly.
The driver outputs and receiver inputs of the
MAX3221E/MAX3223E/MAX3243E have extra protection
against static electricity. Maxim’s engineers have devel-
oped state-of-the-art structures to protect these pins
against ESD of ±15kV without damage. The ESD struc-
tures withstand high ESD in all states: normal operation,
shutdown, and powered down. After an ESD event,
Maxim’s E versions keep working without latchup, where-
as competing RS-232 products can latch and must be
powered down to remove latchup.
ESD protection can be tested in various ways; the trans-
mitter 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 in
3) ±15kV using IEC1000-4-2’s air-gap method
±15kV ESD-Protected, 1µA, 3.0V to 5.5V, 250kbps,
RS-232 Transceivers with AutoShutdown
Figure 6a. Human Body ESD Test Models
10
Figure 6b. Human Body Model Current Waveform
AMPERES
VOLTAGE
SOURCE
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
±15kV ESD Protection
t
DL
I r
PEAK-TO-PEAK RINGING
(NOT DRAWN TO SCALE)
DEVICE
UNDER
TEST
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
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 specifi-
cally refer to integrated circuits. The MAX3221E/
MAX3223E/MAX3243E help you design equipment that
meets Level 4 (the highest level) of IEC1000-4-2, with-
out the need for additional ESD-protection components.
Figure 7b. IEC1000-4-2 ESD Generator Current Waveform
Figure 7a. IEC1000-4-2 ESD Test Model
VOLTAGE
SOURCE
HIGH-
DC
t r = 0.7ns to 1ns
CHARGE CURRENT
LIMIT RESISTOR
R
100%
C
90%
10%
50M to 100M
I
150pF
C s
30ns
STORAGE
CAPACITOR
R
RESISTANCE
DISCHARGE
D
330
60ns
ESD Test Conditions
Human Body Model
IEC1000-4-2
t
DEVICE
UNDER
TEST