L9700D-E
Hex precision limiter
Features
■
High performance clamping at ground and
positive reference voltage
■
Fast active clamping
■
Operating range 4.75 V - 5.25 V
■
Single voltage for supply and positive
reference
■
Low quiescent current
Description
■
Low input leakage current
The L9700D-E is a monolithic circuit which is
suited for input protection and voltage clamping
purpose.
'!0'#&4
SO-8
The limiting function is referred to ground and the
positive supply voltage.
One single element contains six independent
channels.
Very fast speed is achieved by internal feedback
and the application of a new vertical PNPtransistor with isolated collector.
Table 1.
Device summary
Order code
Package
SO-8
October 2011
Doc ID 022301 Rev 1
Tube
Tape and real
L9700D-E
L9700DTR-E
1/14
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1
Contents
L9700D-E
Contents
1
Block diagram and pin connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
2
Electrical specification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
2.1
Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
2.2
Thermal data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
2.3
Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
3
Application information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
4
Package and packing information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
5
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4.1
ECOPACK® . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
4.2
Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Doc ID 022301 Rev 1
L9700D-E
List of tables
List of tables
Table 1.
Table 2.
Table 3.
Table 4.
Table 5.
Table 6.
Device summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Thermal data. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Power section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
SO-8 mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Document revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
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List of figures
L9700D-E
List of figures
Figure 1.
Figure 2.
Figure 3.
Figure 4.
Figure 5.
Figure 6.
Figure 7.
4/14
Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Pin connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
DC input characteristic limit points of the characteristic approximation . . . . . . . . . . . . . . . . 7
Dynamical input characteristics (part 1/2). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Dynamical input characteristics (part 2/2). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Typical application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
SO-8 package dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Doc ID 022301 Rev 1
L9700D-E
1
Block diagram and pin connection
Block diagram and pin connection
Figure 1.
Block diagram
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Figure 2.
Pin connection
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Electrical specification
L9700D-E
2
Electrical specification
2.1
Absolute maximum ratings
Stressing the device above the rating listed in Table 2 may cause permanent damage to the
device. These are stress ratings only and operation of the device at these or any other
conditions above those indicated in the operating sections of this specification is not implied.
Exposure to the conditions in table below for extended periods may affect device reliability.
Table 2.
Absolute maximum ratings
Symbol
VCC
IIN
Tj, Tstg
Ptot
Parameter
Value
Unit
Supply voltage
20
V
Input current per channel
30
mA
-55 to 150
°C
650
mW
Value
Unit
200
°C/W
Junction and storage temperature
Total power dissipation (Tamb = 85°C)
Note:
The circuit is ESD protected according to MIL-STD-883C
2.2
Thermal data
Table 3.
Symbol
Rthj-amb
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Thermal data
Parameter
Thermal resistance junction-ambient (max)
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L9700D-E
2.3
Electrical specification
Electrical characteristics
VCC = 5 V; Tj = -40 to 125°C, unless otherwise specified.
Table 4.
Power section
Symbol
Parameter
VCC
Supply voltage
ICC
Supply current
Vcis
Static input clamping
voltage
IIN
Vcld(1)
tS(1)
RIN(1)
Test conditions
Min.
Typ.
4.75
1.5
Input current (static)
Dynamic input clamping
voltage
Setting time
Max.
Unit
5.25
V
3
mA
Negative IIN = -10 mA
–250
0
mV
Positive IIN = 10 mA
VCC
VCC + 250
mV
VIN = 0
15
µA
VIN = VCC
15
µA
VIN = 50 mV
5
µA
VIN = VCC - 50 mV
5
µA
IIN = ±10 mA; tR = 5 ns
Positive overshoot
400
mV
IIN = ±10 mA; tR = 5 ns
Negative overshoot
400
mV
See Figure 4
20
ns
5
Ω
Dynamic input resistance
1. Design limits are guaranteed by statistical control on production samples over the indicated temperature
and supply voltage ranges. These limits are not used to calculate outgoing quality levels.
Figure 3.
DC input characteristic limit points of the characteristic approximation
("1($'5
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Electrical specification
Figure 4.
L9700D-E
Dynamical input characteristics (part 1/2)
("1($'5
Figure 5.
Dynamical input characteristics (part 2/2)
("1($'5
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L9700D-E
3
Application information
Application information
Figure 6.
Typical application
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Most integrated circuits, both HNMOS and bipolar, are very sensitive to positive and
negative overvoltages 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 aimed at it indispensable.
Overvoltages on the supply line are faced through high voltage integration technologies or
through external protection (transil, varistor).
Signal inputs are generally protected using clamp diodes to the supply and ground, and a
current limiter 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 signals.
The L9700D-E device combines a high intervention speed with a high precision positive and
negative clamp and a low current leakage providing the optimal solution to the problems of
the automotive environment.
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 capacitors for the limitation of the
transient rise times.
Figure 6 illustrates a typical automotive application scheme. The resistor RS limits the input
current of the device and is therefore dimensioned considering the characteristics of the
transients to be eliminated.
Consequently:
V transient Peak
R S = -----------------------------------I IN MAX
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Application information
L9700D-E
The CIN capacitors must be used only on analog inputs because they present a low
impedance during the sampling period.
The minimum value for CIN is determined by the accuracy required, the time taken to
sample the input and the input impedance during that time, while the maximum value is
determined by the required frequency response and the value of RS.
Thus for a resistive input A/D connector where:
TS = sample time (seconds)
RD = device input resistance (Ohms)
VIN = input voltage (Volts)
k = required accuracy (%)
Q1 = charge on capacitor before sampling
Q2 = charge on capacitor after sampling
ID = device input current (Amps)
k⋅Q
Thus: Q 1 – Q2 = --------------1100
but Q1 = CIN VIN
and Q1 – Q2 = ID – TS
k ⋅ C IN – V IN
so that I D T S = -------------------------------100
ID ⋅ TS
and C IN ( min ) = ----------------- Farad
V IN ⋅ k
100 ⋅ T S
so C IN ( min ) = --------------------- Farad
k ⋅ RD
The calculation for a sample and hold type convertor is even simpler:
k = required accuracy (%)
CH = hold capacitor (farad)
100 ⋅ C H
C IN ( min ) = ---------------------- Farad
k
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L9700D-E
Package and packing information
4
Package and packing information
4.1
ECOPACK®
In order to meet environmental requirements, ST offers these devices in different grades of
ECOPACK® packages, depending on their level of environmental compliance. ECOPACK®
specifications, grade definitions and product status are available at: www.st.com.
ECOPACK® is an ST trademark.
Package mechanical data
Figure 7.
SO-8 package dimensions
6
H
E
H
D
E
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D
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D
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Package and packing information
Table 5.
L9700D-E
SO-8 mechanical data
mm.
Dim.
Min.
Typ.
A
a1
1.75
0.1
0.25
a2
1.65
a3
0.65
0.85
b
0.35
0.48
b1
0.19
0.25
C
0.25
0.5
c1
45° (typ.)
D
4.8
5.0
E
5.8
6.2
e
1.27
e3
3.81
F
3.8
4.0
L
0.4
1.27
M
0.6
S
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Max.
8° (max.)
Doc ID 022301 Rev 1
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5
Revision history
Revision history
Table 6.
Document revision history
Date
Revision
05-Oct-2011
1
Changes
Initial release.
Doc ID 022301 Rev 1
13/14
L9700D-E
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