DSA0089130.pdf by Holtek

Partial File Text HT9201A/B Simple Tone Dialer Features · · · Patent Number: 113235(R.O.C.), 5424740(U.S.A.) · · Operating voltage: 2.0V~5.5V Low standby current 4×4 keyboard matrix 3.58MHz crystal or
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cmos ic for keypad HT9201A HT9201B keyboard CIRCUIT diagram keyboard matrix keyboard to DTMF

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