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ST1284-XXA8T8 Fiches technique(PDF) 4 Page - STMicroelectronics

No de pièce ST1284-XXA8T8
Description  PARALLEL PORT SINGLE TERMINATION NETWORK WITH 짹15kV ESD PROTECTION
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Fabricant  STMICROELECTRONICS [STMicroelectronics]
Site Internet  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

ST1284-XXA8T8 Fiches technique(HTML) 4 Page - STMicroelectronics

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ST1284-xxA8/T8
FREQUENCY BEHAVIOR OF DATA AND STROBE SIGNALS
TECHNICAL INFORMATION
ST1284
SPECTRUM
ANALYSER
TRACKING
GENERATOR
Vg
Vout
Vin
50
50
+5V
Fig. A1: Measurement conditions
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)
1284 - 01
1284 - 02
1284 - 03
Fig. A2: Typical frequency response curve for data
and strobe signals.
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 IEC61000-4-2 and is already in place in Europe.
This test requires that a device tolerates ESD events and remain operational without user intervention.
The ST1284-xxA8/T8 is particularly optimized to perform ESD protection. ESD protection is based on the
use of device which clamps at :
Vouput
V
R I
BR
d
PP
=+
.
This protection function is splitted in 2 stages. As shown in figure A3, 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.
ESD PROTECTION
ESD Surge
Vinput
Voutput
Rload
Rg
R
S1
Rd
V
BR
V
BR
V
PP
Device
to be
protected
ST1284-xxA8/T8
Rd
S2
Fig. A3: ST1284 ESD clamping behavior


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