www.DataSheet4U.com HT9170B/HT9170D DTMF Receiver.
Holtek Semiconductor Inc
HT9170D - DTMF Receiver
www.DataSheet4U.com HT9170B/HT9170D DTMF Receiver Features · Operating voltage: 2.5V~5.5V · Minimal external components · No external filter is requi.