L9704D STMicroelectronics, L9704D Datasheet

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L9704D

Manufacturer Part Number
L9704D
Description
OCTAL SUPPLY CONTACT MONITORING CIRCUIT
Manufacturer
STMicroelectronics
Datasheet

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Part Number:
L9704D
Manufacturer:
ST
0
March 1992
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DESCRIPTION
The L9704 is a bipolar monolithic integrated circuit
for monitoring the status of up to eight contactscon-
nected to the power supply (battery).
BLOCK DIAGRAM
OPERATING DC SUPPLY VOLTAGE RANGE
5V TO 25V
SUPPLY OVERVOLTAGE PULSE UP TO 40V
VERY LOW STANDBY QUIESCENT CUR-
RENT 0.2mA
INTERNAL CLAMPING DIODES AT CONTACT
INPUTS TO V
INPUT PULSE CURRENT CAPABILITY UP TO
+ 50mA, – 75mA
NOMINAL CONTACT CURRENTS OF 10mA
DEFINED BY EXTERNAL CONTACT SERIES
RESISTORS R
CONTACT STATUS MONITORING BY COM-
PARING THE RESISTANCE AT CONTACT
SENSEINPUTS WITH THE INTERNAL REFER-
ENCE RESISTOR VALUE
HIGH IMMUNITY DUE TO RESISTANCE COM-
PARISON WITH HYSTERESIS
S
IN1-8
OCTAL SUPPLY CONTACT MONITORING CIRCUIT
AND GND
It contains eight contact sense inputs and eight mi-
crocomputer compatible three-state outputs.
ORDERING NUMBERS: L9704 (DIP–20)
DIP–20
SO–20L
L9704D (SO–20L)
L9704
1/8

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L9704D Summary of contents

Page 1

... The L9704 is a bipolar monolithic integrated circuit for monitoring the status eight contactscon- nected to the power supply (battery). BLOCK DIAGRAM March 1992 DIP–20 SO–20L ORDERING NUMBERS: L9704 (DIP–20) L9704D (SO–20L) It contains eight contact sense inputs and eight mi- crocomputer compatible three-state outputs. L9704 1/8 ...

Page 2

L9704 ABSOLUTE MAXIMUM RATINGS Symbol V Transient Supply Voltage ( Logic Supply Voltage CC I Input DC Current Input DC Pulse INP (test pulse specification: 0 < tP < 2ms Output Current O ...

Page 3

ELECTRICAL CHARACTERISTICS (5V otherwise specified; the currents flowing in the arrow direction are assumed positive as marked in the application circuit diagram, fig. 1). Symbol Parameter V Enable Input Voltage LOW ENL (device activated) V Enable Input Voltage HIGH ENH ...

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L9704 APPLICATION CIRCUIT DIAGRAM Figure 1 : Typical application diagram for the L9704 circuit. The current flowing in the arrow direction is as- sumed positive. The external capacitors C the corresponding pins. FUNCTIONAL DESCRIPTION The L9704 circuit monitors the status ...

Page 5

The internal clamping diodes at the contact monitor- ing inputs, together with the external contact series resistors R , allows the device to withstand tran- IN sients at the contact connection.The contact series resistor R limits the input current at ...

Page 6

L9704 SO20 PACKAGE MECHANICAL DATA DIM. MIN 0 0. 7 6/8 mm TYP. MAX. MIN. 2.65 0.3 0.004 2.45 0.49 0.014 ...

Page 7

DIP20 PACKAGE MECHANICAL DATA DIM. MIN. a1 0.254 B 1. TYP. MAX. MIN. 0.010 1.65 0.055 0.45 0.25 25.4 8.5 2.54 22.86 7.1 3.93 3.3 1.34 L9704 inch TYP. ...

Page 8

L9704 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 ...

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