The internal clamping diodes at the contact monitor-

ing inputs, together with the external contact series

sients at the contact connection. The contact series

The dynamic behaviour of the circuit is defined by

is defined only by the internal circuitry. In bothcases,

an externaloutput capacitanceless than 50pF is as-

sumed, the internal output capacitances of the

three-state buffers are less than 5pF.

Figure 2 : The Contact Sense Input Connection with the Contact Equivalent Circuit.

Figure 3 : The Output Voltage as a Function of the Input Resistance at the Corresponding Contact Sense

Input.

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