L9700D STMicroelectronics, L9700D Datasheet - Page 4

• Manufacturer Part Number: L9700D
• Description: IC LIMITER HEX PREC SO-8
• Manufacturer: STMicroelectronics
• Series: L9700r

Specifications of L9700D

• Voltage - Working: 5V
• Technology: Mixed Technology
• Power (watts): 650mW
• Number Of Circuits: 6
• Applications: General Purpose
• Package / Case: 8-SOIC (3.9mm Width)
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Voltage - Clamping: -

Figure 2 : Dynamical Input Characteristics (continued) .
APPLICATION INFORMATION
Most integrated circuits, both HNMOS and bipolar,
are very sensitive to positive and negative overvol-
tages on the supply and at the inputs.
These transients occur in large numbers and with
different magnitudes in the automotive environment,
making adequate protection for devices ai-med at it
indispensible.
Overvoltages on the supply line are faced through
high voltage integration technologies or through ex-
ternal protection (transil, varistor).
Signal inputs are generally protected using clamp
diodes to the supply and ground, and a current limi-
ter resistor. However, such solutions do not always
completely satisfy the protection specifications in
terms of intervention speed, negative clamping and
current leakage high enough to change analog si-
gnals.
The L9700 device combines a high intervention
speed with a high precision positive and negative
L9700
4/8
2b
clamp and a low current leakage providing the opti-
mal solution to the problems of the automotive en-
vironment.
The high intervention speed, due to the pre-bias of
the limiter stage and internal feedback, limits the
voltage overshoot and avoid the use of external ca-
pacitors for the limitation of the transient rise times.
Figure 3 illustrates a typical automotive application
scheme. The resistor R
the device and is therefore dimensioned considering
the characteristics of the transients to be eliminated.
Consequently :
The C
puts because they present a low impedance during
the sampling period.
IN
capacitors must be used only on analog in-
R
S
=
V
S
transient Peak
limits the input current of
I
IN MAX