E910.33

• Supply voltage range VDD 4.75V to 5.25V
• Monitoring supply voltage range VS 5.25V to 25V
• Maximum overvoltage protection up to 40V
• Internal clamp diodes at each input to VS and GND
• Low standby current ( typical < 10A )
• Contact status monitoring by comparison of the resistance
  at the inputs with an internal reference
• High noise immunity
•  40C to + 125C operating temperature
• SO20 package

The E910.33 input currents are compared with the current of an internal reference resistor. The IC is designed to operate with an external series resistor RIN0 to RIN7 of 1kΩ. The current, driven through the contacts keeps their resistance low.

The  output switches to high when the input resistance increases to above 9kΩ and switches to low when the input resistance falls below 1.5kΩ. These values are valid within the supply range 5.25V to 25V.

A closed switch corresponds to a low logic level on the outputs OUT0-7.