Ht9032c схема
This pin may be ht9032c from an external clock source. It couples the схема signal to the precision ring detector ht9032c an attenuating схема. Operating voltage: 3.
The device also provides a carrier detection circuit and схема ring detection circuit for easier system applications.
A crystal ht9032c ceramic resonator should be connected to this pin and X1. This is a Schmitt trigger input? It detects ring energy on the line through an attenuating network and enables the oscillator and ring detection.