Datasheet L9703D, L9703 Datasheet (SGS Thomson Microelectronics)

OCTAL GROUND CONTACT MONITORING CIRCUIT

.OPERATING DC SUPPLY VOLTAGE RANGE

5V TO 25V

.SUPPLYOVERVOLTAGEPULSEUP TO 40V

.VERY LOW STANDBY QUIESCENT CUR-

RENT0.2mA

.INTERNAL CLAMPING DIODESATCONTACT

INPUTS TO V

ANDGND

S

.INPUTPULSECURRENT CAPABILITYUPTO

+ 50mA ;– 75mA

.NOMINALCONTACTCURRENT OF10mADE-

FINEDBYEXTERNALCONTACT SERIESRE­SISTORS R

I N1–8

.CONTACT STATUS MONITORING BY COM-

PARING THE RESISTANCE AT CONTACT
SENSEINPUTSWITHTHEINTERNALREFER­ENCERESISTOR VALUE

.HIGHIMMUNITYDUETORESISTANCECOM-

PARISONWITH HYSTERESIS

L9703

DIP-20

SO-20L

ORDERINGNUMBERS : L9703 (DIP-20)

L9703D (SO-20L)

DESCRIPTION

TheL9703isa bipolarmonolithicintegratedcir­cuitfor monitoringthe statusofupto eightcon­tactsconnectedto GND.

BLOCK DIAGRAM

It containseightcontactsenseinputsandeight
microcomputercompatiblethree-stateoutputs.

March 1992

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L9703

PIN CONNECTION (top view)

ABSOLUTE MAXIMUM RATINGS

Symbol Parameter Test Conditions Unit

V

V

I

IN DC

I

INP

I

V

CC

O
EN

Transient Supply Voltage (t ≤ 1s) +40 V

S

Logic Supply Voltage 7 V
Input DC Current ±40 mA
Input DC Pulse

(test pulse specification: 0 < tP < 2ms, f ≤ 0.2Hz, n = 25000)

50

-75
Output Current Internally Limited
Enable Input Voltage VCC+0.3

-0.3

T

P

O

stg,TJ

Power Dissipation at T

amb

=80°C

DIP20
SO20

875
420

Storage and Junction Temperature Range -55 to 150 °C

THERMAL DATA

Symbol Parameter DIP20 SO20 Unit

R

th j-amb

Thermal Resistance Junction to Ambient MAX. 80 165 °C/W

mA
mA

V
V

mW
mW

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L9703

ELECTRICALCHARACTERISTICS (5V ≤ VS≤ 25V; -40°C ≤ Tj≤ 125°C;4.75V ≤ VCC≤ 5.25Vunless oth-

erwise specified;thecurrentsflowinginthearrowdirectionareassumedpositiveas markedintheapplication
circuitdiagram,fig. 1).

Symbol Parameter Test Conditions Min. Typ. Max. Unit

V

ENL

V

ENH

V

ENhyst

I

EN

V

OUTH

V

OUTL

I

OUT TS

V

IN

V

IN

I

OUT

I

OUT

R

IL

R

IH

R

IL

R

IH

I

QC

I

QS

I

QC

I

QS

t

do

t

dTS

Enable Input Voltage LOW
(device activated)

Enable Input Voltage HIGH 2.4 V
Enable Input Hysteresis 200 420 800 mV
Enable Input Current 2.4V < VEN<V

0V < V

EN

Output Voltage HIGH 0 < I
Output Voltage LOW I
Output TRISTATE Current 0 < V

OUT

= -1mA 0.05 0.2 0.4 V

OUT

OUT<VCC

CC

< 0.8V -5 -1 µA

< 100µA 4.0 VCC-0.1 V

Input Voltage (device active) EN = LOW

=1kΩ

R

Input Clamped Voltage
(device disabled)

IN

EN = HIGH

= 30mA

I

IN

= -30mA

I

IN

-2 VS-1.5 VS- 0.4 V

V

S

V

+0.3-2VS+1-1VS+2

S

Output Current OUT = HIGH

=0

V

OUT

Output Current OUT = LOW

VOUT = 5.5V

Input Resistor (note 1)
LOW Threshold

Input Resistor (note 1)

5V < VS< 16V

GND

 ≤ 0.1V

∆ V

S

1.8 4 KΩ

5.3 20 KΩ

HIGH Threshold
Input Resistor

0.65 0.75 0.85

Threshold Ratio (note1)
Quiescent Current EN = HIGH (t

5V < V

-40°C ≤ T

< 16V

S

ENH

≤ 100°C

j

≥ 80µs)

0.12 0.16 mA

Quiescent Current All Inputs Open 0.04 mA

All Inputs Closed 0.24 mA

Quiescent Current EN = LOW 6

Delay Time/Output
(EN LOW to output data ready)

Delay Time/Tristate
(EN HIGH to output TRISTATE)

C

≤ 50pF 15

OUT

C

≤ 50pF 10 µs

OUT

0.8 V

5 µA

CC

V

0.5 µA

V

-0.3

V

2mA

-20 mA

mA

6

mA

µs

+3R

INCIN

Note : 1. The input resistor threshold value is theresistor value from theIN-pin to ground at which the corresponding output changes

itsstatus (see fig. 3).

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L9703

APPLICATION CIRCUIT
Figure 1 : TypicalApplicationDiagram for the L9703Circuit.The currentflowingin the arrowdirection is

assumedpositive.TheexternalcapacitorsC
at the correspondingpins.

IN

andC

representthe total wiring capacitance

OUT

4/9

FUNCTIONAL DESCRIPTION

TheL9703circuitmonitorsthestatusofthecontacts
connectedtoground and throughthisseries exter­nalresistorsR

tothecontactsenseinputpins.The

IN

contacts equivalent circuit is supposed to be as
shownin fig.2.

The L9703 circuit compares the input current with
the current through the internalreference resistor.
Thedeviceisdesignedtoworkwithanexternalinput
seriesresistorofR

=1kΩ.Withthisinputresistor

IN1-8

the contact current,when the contactisclosed and
the device activated(EN = LOW)is

-2V

V

S

=

I

IN

1kΩ (1)

For this calculation the limit value of the V

S

to IN
saturationvoltageof2V wasconsideredso thatthe
lowestlimitvalue of I

iscalculatedin(1).

IN

Thefunctionof thecircuitcanbedemonstratedwith
the transfer characteristics, showing the output
statusas a functionof the input resistor R
infigure3.Theinputresistorisasum of theR
thecontactresistanceR

CON

orR

COFF

, shown

I

and

IN

, fortheclosed

contact:

R

I=RIN+RCON,

(2)

and for theopen contact:

R

I=RIN+RCOFF

. (3)

L9703

TheoutputgoesHIGHwhentheinputresistancein­creasesabove5.3kΩ(typicalvalue)andgoesLOW,
when the input resistance decreases below 4kΩ
(typical value). The limit values of R
LOWandR
withR

=20kΩ forHIGHimpliesthat a contact

I

=100Ω (atIIN=10mA)will berecognized

CON

as ON=LOW anda contactwithR
be recognized as OFF = HIGH. These limits are
validwithin the supplyvoltagerange6V ≤ VS≤ 16V
and the ground potential difference of
∆VGND = 0,1V.

The internalclampingdiodes at the contact moni­toringinputs,togetherwiththeexternalcontactsse­ries resistors R

, allows the device to withstand

IN

transientsatthecontactconnection.Thecontactse­riesresistor R

limits the input current at the tran-

IN

sient.
The dynamicbehaviour of the circuit is definedby

the timest

do

andt
inputcapacitorC
sistorR

. In this casethe totaldelaytimemay also

IN

. Whenthe contactisopen,the

dTs

mustbe chargedthroughthe re-

IN

be influencedby the timeconstantR
Thedelaytimet

,whendisablingthedevice,isde-

dTs

finedonlyby the internalcircuitry. Inboth cases,an
external output capacitanceless than 50pF is as­sumed, the internal output capacitances of the
three-statebuffers are less than5pF.

= 1.8KΩ for

I

=19kΩwill

COFF

INCIN

.

Figure 2 : The Contact SenseInputConnectionwith the ContactEquivalentCircuit.

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L9703

Figure 3 : The OutputVoltageas a Functionof theInput Resistanceat the CorrespondingContact Sense

Input.

6/9

SO20 PACKAGE MECHANICAL DATA

L9703

DIM.

MIN. TYP. MAX. MIN. TYP. MAX.

A 2.65 0.104
a1 0.1 0.3 0.004 0.012
a2 2.45 0.096

b 0.35 0.49 0.014 0.019
b1 0.23 0.32 0.009 0.013

C 0.5 0.020
c1 45 (typ.)

D 12.6 13.0 0.496 0.512

E 10 10.65 0.394 0.419

e 1.27 0.050
e3 11.43 0.450

F 7.4 7.6 0.291 0.299

L 0.5 1.27 0.020 0.050

M 0.75 0.030

S 8 (max.)

mm inch

7/9

L9703

DIP20 PACKAGE MECHANICAL DATA

DIM.

MIN. TYP. MAX. MIN. TYP. MAX.

a1 0.254 0.010

B 1.39 1.65 0.055 0.065

b 0.45 0.018
b1 0.25 0.010

D 25.4 1.000

E 8.5 0.335

e 2.54 0.100
e3 22.86 0.900

F 7.1 0.280

I 3.93 0.155
L 3.3 0.130
Z 1.34 0.053

mm inch

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L9703

Information furnished is believed to be accurate and reliable. However, SGS-THOMSON Microelectronics assumes no responsibility for
the consequences of use of such information nor for any infringement of patents or other rights of third parties which may result from its
use. No license is granted by implication or otherwise under any patent or patent rights of SGS-THOMSON Microelectronics. Specifica­tions mentioned in this publication are subject to change without notice. This publication supersedes and replaces all information pre­viously supplied. SGS-THOMSON Microelectronics products are not authorized for use as critical components in life support devices or
systems without express written approval of SGS-THOMSON Microelectronics.

 1994 SGS-THOMSON Microelectronics - All Rights Reserved

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