MT88L70AN1 IC RECEIVER DTMF 20SSOP
Email: jody@theicchip.com
ome of the clock input class function of the pin, in the case of not using the best direct grounding or through a pull-down resistance grounding, to prevent the interference of the pin to affect the normal operation of the chip.
Some control pins that control the class, if not used, it is better to pull up and down to a fixed function to trigger the level, so that the pin has a stable reference level input.