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ST1284 Fiches technique(PDF) 6 Page - STMicroelectronics

No de pièce ST1284
Description  Parallel port single termination network with 짹15 kV ESD protection
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Fabricant  STMICROELECTRONICS [STMicroelectronics]
Site Internet  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

ST1284 Fiches technique(HTML) 6 Page - STMicroelectronics

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Technical information
ST1284
6/10
Doc ID 6976 Rev 4
3
Technical information
3.1
Frequency behavior of data and strobe signals
3.2
ESD protection
In addition to the requirements of termination and EMC compatibility, computing devices are
required to be tested for ESD susceptibility. This test is described in the IEC 61000-4-2 and
is already in place in Europe. This test requires that a device tolerates ESD events and
remain operational without user intervention.
The ST1284-01A8 is particularly optimized to perform ESD protection. ESD protection is
based on the use of device which clamps at:
Vouput = VBR + Rd · IPP
This protection function is split in 2 stages. As shown in Figure 7, the ESD strikes are
clamped by the first stage S1 and then its remaining overvoltage is applied to the second
stage through the resistor R. Such a configuration makes the voltage very low at the output.
Figure 7.
ST1284 ESD clamping behavior
Figure 5.
Measurement conditions
Figure 6.
Typical frequency response curve
for data and STROBE signal
ST1284
SPECTRUM
ANALYSER
TRACKING
GENERATOR
Vg
Vout
Vin
50
Ω
50
Ω
+5V
1
3
10
30
100
300
1,000
-30.00
-25.00
-20.00
-15.00
-10.00
-5.00
0.00
dB
F (MHz)
ESD Surge
Vinput
Voutput
Rload
Rg
R
S1
Rd
V
BR
V
BR
Device
to be
protected
ST1284-xxA8
Rd
S2


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