The L9703 is a bipolar monolithic integrated circuit for monitoring the status of up to eight contacts connected to GND. It contains eight contact sense inputs and eight microcomputer compatible three-state outputs.
Operating DC supply voltage range 5V to 25V
Supply over voltage pulse up to 40V
Very low standby quiescent current 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 defined by external contact series resistors RI N1–8
Contact status monitoring by comparing the resistance at contact sense inputs with the internal reference resistor value
High immunity due to resistance comparison with hysteresis
SO-20L package. Manufactured by ST.