MAX3187CAX Maxim Integrated Products, MAX3187CAX Datasheet - Page 6

• Manufacturer Part Number: MAX3187CAX
• Description: RS-232 Interface IC
• Manufacturer: Maxim Integrated Products

Specifications of MAX3187CAX

• Package / Case: SSOP-36
• Dimensions: 15.55 mm L x 7.6 mm W x 2.36 mm H
• Mounting Style: SMD/SMT
• Lead Free Status / Rohs Status: No

±15kV ESD-Protected, EMC-Compliant, 230kbps,
Dual RS-232 Serial Port for Motherboards/Desktops
Figure 2a. Human Body ESD Test Model
Figure 3a. IEC 1000-4-2 ESD Test Model
Figure 2a shows the Human Body Model, and Figure
2b 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 device through a
1.5kΩ resistor.
Since January 1996, all equipment manufactured
and/or sold in the European community has been
required to meet the stringent IEC 1000-4-2 specifica-
tion. The IEC 1000-4-2 standard covers ESD testing
and performance of finished equipment; it does not
specifically refer to integrated circuits. The MAX3187
6
VOLTAGE
SOURCE
VOLTAGE
HIGH-
SOURCE
_______________________________________________________________________________________
HIGH-
DC
DC
CHARGE-CURRENT
CHARGE-CURRENT
LIMIT RESISTOR
LIMIT RESISTOR
50M to 100M
1M
R
R
C
100pF
C
150pF
C s
C s
STORAGE
CAPACITOR
STORAGE
CAPACITOR
1500
RESISTANCE
DISCHARGE
RESISTANCE
DISCHARGE
R
330
D
R
D
Human Body Model
IEC 1000-4-2
DEVICE
UNDER
DEVICE
UNDER
TEST
TEST
helps you design equipment that meets Level 4 (the
highest level) of IEC 1000-4-2, without additional ESD-
protection components.
The main difference between tests done using the
Human Body Model and IEC 1000-4-2 is higher peak
current in IEC 1000-4-2. Because series resistance is
lower in the IEC 1000-4-2 ESD test model (Figure 3a), the
ESD withstand voltage measured to this standard is gen-
erally lower than that measured using the Human Body
Model. Figure 3b shows the current waveform for the
±8kV IEC 1000-4-2 Level 4 ESD Contact-Discharge test.
The Air-Gap test involves approaching the device with a
charge probe. The Contact-Discharge method connects
the probe to the device before the probe is energized.
Figure 2b. Human Body Model Current Waveform
Figure 3b. IEC 1000-4-2 ESD-Generator Current Waveform
AMPERES
t
r
= 0.7ns to 1ns
I
P
36.8%
100%
10%
90%
100%
90%
10%
0
0
I
t
RL
30ns
CURRENT WAVEFORM
TIME
60ns
t
DL
I r
PEAK-TO-PEAK RINGING
(NOT DRAWN TO SCALE)
t