L9703 查看數據表（PDF） - STMicroelectronics
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L9703 Datasheet PDF : 9 Pages
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L9703
OCTAL GROUND CONTACT MONITORING CIRCUIT
. 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 VS AND GND
. INPUT PULSE CURRENT CAPABILITY UP TO
+ 50mA ; – 75mA
. NOMINAL CONTACT CURRENT OF 10mA DE-
. FINED BY EXTERNAL CONTACT SERIES RE-
SISTORS RI N1–8
CONTACT STATUS MONITORING BY COM-
PARING THE RESISTANCE AT CONTACT
. SENSE INPUTS WITH THE INTERNAL REFER-
ENCE RESISTOR VALUE
HIGH IMMUNITY DUE TO RESISTANCE COM-
PARISON WITH HYSTERESIS
DIP-20
SO-20L
ORDERING NUMBERS : L9703 (DIP-20)
L9703D (SO-20L)
DESCRIPTION
The L9703 is a bipolar monolithic integrated cir-
cuit for monitoring the status of up to eight con-
tacts connected to GND.
It contains eight contact sense inputs and eight
microcomputer compatible three-state outputs.
BLOCK DIAGRAM
March 1992
1/9
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