MAX1406CAE+ Maxim Integrated Products, MAX1406CAE+ Datasheet - Page 6

• Manufacturer Part Number: MAX1406CAE+
• Description: IC TXRX RS232 ESD PROT 16-SSOP
• Manufacturer: Maxim Integrated Products
• Type: Transceiverr

Specifications of MAX1406CAE+

• Number Of Drivers/receivers: 3/3
• Protocol: RS232
• Voltage - Supply: 4.5 V ~ 5.5 V
• Mounting Type: Surface Mount
• Package / Case: 16-SSOP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

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
1.5k resistor.
The IEC1000-4-2 standard covers ESD testing and per-
formance of finished equipment; it does not specifically
refer to integrated circuits. The MAX1406 helps you
design equipment that meets Level 4 (the highest level)
of IEC1000-4-2, without additional ESD-protection com-
ponents.
The main difference between tests done using the
Human Body Model and IEC1000-4-2 is higher peak
current in IEC1000-4-2 (Figure 3). Because series resis-
tance is lower in the IEC1000-4-2 ESD test model, the
±15kV ESD-Protected, EMC-Compliant,
230kbps, 3-Tx/3-Rx RS-232 IC
Figure 2. Human Body ESD Test Model and ESD-Generator
Current Waveform
6
b)
a)
AMPERES
VOLTAGE
SOURCE
_______________________________________________________________________________________
HIGH-
DC
I
P
36.8%
100%
90%
10%
CHARGE-CURRENT
0
LIMIT RESISTOR
0
R
t
RL
C
100pF
1M
C s
CURRENT WAVEFORM
STORAGE
CAPACITOR
TIME
R
RESISTANCE
D
DISCHARGE
1500
t
DL
I r
Human Body Model
PEAK-TO-PEAK RINGING
(NOT DRAWN TO SCALE)
IEC1000-4-2
DEVICE
UNDER
TEST
ESD withstand voltage measured to this standard is
generally lower than that measured using the Human
Body Model. Figure 3b shows the current waveform for
the ±8kV IEC1000-4-2 Level 4 ESD Contact-Discharge
test.
The Air-Gap test involves approaching the device with
a charge probe. The Contact-Discharge method con-
nects the probe to the device before the probe is ener-
gized.
The Machine Model for ESD testing uses a 200pF stor-
age capacitor and zero-discharge resistance. It mimics
the stress caused by handling during manufacturing
and assembly. Of course, all pins (not just RS-232
inputs and outputs) require this protection during man-
ufacturing. Therefore, the Machine Model is less rele-
vant to the I/O ports than are the Human Body Model
and IEC1000-4-2.
Figure 3. IEC1000-4-2 Test Model and ESD-Generator Current
Waveform
a)
b)
VOLTAGE
SOURCE
t
HIGH-
r
DC
= 0.7ns to 1ns
CHARGE-CURRENT
100%
LIMIT RESISTOR
90%
10%
R
I
C
50M to 100M
150pF
C s
30ns
STORAGE
CAPACITOR
R
RESISTANCE
DISCHARGE
D
330
60ns
Machine Model
DEVICE
UNDER
TEST
t