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MAX1489E 데이터 시트보기 (PDF) - Maxim Integrated

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MAX1489E 15kV ESD-Protected, Quad, Low-Power RS-232 Line Receiver MaximIC
Maxim Integrated MaximIC
MAX1489E Datasheet PDF : 8 Pages
1 2 3 4 5 6 7 8
±15kV ESD-Protected, Quad,
Low-Power RS-232 Line Receiver
RC 50Mto 100MRD 330
CHARGE-CURRENT DISCHARGE
LIMIT RESISTOR RESISTANCE
HIGH-
VOLTAGE
DC
SOURCE
Cs
150pF
STORAGE
CAPACITOR
DEVICE
UNDER
TEST
Figure 3a. IEC1000-4-2 ESD Test Model
I
100%
90%
10%
tr = 0.7ns to 1ns
30ns
t
60ns
Figure 3b. IEC1000-4-2 ESD Generator Current Waveform
Machine Model
The Machine Model for ESD testing uses a 200pF stor-
age capacitor and zero-discharge resistance. Its objec-
tive is to mimic the stress caused by contact that
occurs with handling and assembly during manufactur-
ing. Of course, all pins (not just RS-232 inputs and out-
puts) require this protection during manufacturing.
Therefore, the Machine Model is less relevant to the I/O
ports than the Human Body Model and IEC1000-4-2.
__________ Applications Information
Use proper layout to ensure other devices on your
board are not damaged in an ESD strike. Currents as
high as 60A can instantaneously pass through the
ground pin, so it is important to minimize the ground-
lead return path to the power supply. A separate return
path to the power supply is recommended. Trace
widths should be greater than 40 mils. VCC must be
bypassed with 0.1µF capacitors as close to the part as
possible to ensure maximum ESD protection.
_______________________________________________________________________________________ 5
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