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SM14LV1 Fiches technique(PDF) 2 Page - Microsemi Corporation

No de pièce SM14LV1
Description  SM14LV1.7C TVSarray?
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Fabricant  MICROSEMI [Microsemi Corporation]
Site Internet  http://www.microsemi.com
Logo MICROSEMI - Microsemi Corporation

SM14LV1 Fiches technique(HTML) 2 Page - Microsemi Corporation

  SM14LV1 Datasheet HTML 1Page - Microsemi Corporation SM14LV1 Datasheet HTML 2Page - Microsemi Corporation  
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Microsemi
Scottsdale Division
8700 E. Thomas Rd. PO Box 1390, Scottsdale, AZ 85252 USA, (480) 941-6300, Fax: (480) 947-1503
Copyright
 2001
MSCXXXX.PDF 9-20-2004 REV J
TITE
LAMP
SM14LV1.7C TVSarray™
SCO T TSD A LE DIVISION
Application Notes For Using The SM14LV1.7C
TITEClampTM TVSarrayTM
The SM14LV1.7C TITEClamp TVSarray is a 10 wire protector designed for clamping voltage spikes to lowest possible levels
between the signal line and the Vcc supply or ground. This device incorporates Microsemi's proprietary "Self Programmable"
feature that provides exceedingly tight clamping of only 1.7V maximum above signal line voltages ranging from 3.0V up
through 30V. Destructive over-current is diverted through the plus and minus Vcc rails or ground for negative transients.
One size fits all
Downsizing of on chip components to sub-micron dimensions has improved performance, reduced component size and
cost at the expense of lower failure voltage thresholds. The demand has surfaced for improved protection across data
lines in highly automated manufacturing, monitoring and control systems. These environments are usually harsh and subject
to conducted and induced transient voltages originating from sources including motors, solenoids and welders.
The connection points are shown in figure 1. Pins 1 and 14 are connected to +Vcc, with pins 7 & 8 being either -Vcc or
ground. The lines are spread out for purposes of illustrating the connections; however, the traces between signal lines and
the TVS should be at an absolute minimum to reduce parasitic reluctance which causes overshoot per Faraday's laws of
induction, V=L(di/dt). In figure 2, the segment for a single wire is detailed for improved illustration. A scaled illustration of
clamping on a 12V signal line example is shown in figure 3. This depicts a small but acceptable rise in voltage above the
signal during worse case transient conditions.
Clamp Performance
12 V
Signal Voltage
V
t
1.7V Max
Clamp Level
To
Signal
Line
+ Vcc
- Vcc or Gnd
Single Line Detail
7
6
5
4
3
2
1
8
9
10
11
12
13
14
1
2
3
4
5
10
9
8
6
7
TITE
LAMP
+ VCC
- VCC
or Gnd
Line Installation
Figure 3.
Figure 2.
Figure 1.
Precautions in component placement and board layout:
1. Place the SM14LV1.7C directly at the board/signal line interface.
2. Keep all traces short for both signal lines and Vcc (and ground if applicable).
3. Eliminate ground loops.
If the reader has further technical questions, please contact Microsemi-Scottsdale applications engineering at 480-941-6433 or 480-941-6524.


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