Features
 Operating voltage: 2.5V~5.5V
 Minimal external components
 No external filter is required
 Low standby current (on power down mode)
 Excellent performance
 Tristate data output for C interface
 3.58MHz crystal or ceramic resonator
 1633Hz can be inhibited by the INH pin
 HT9170B: 18-pin DIP package
HT9170D: 18-pin SOP package
General Description
The HT9170 series are Dual Tone Multi Frequency
(DTMF) receivers integrated with digital
decoder and bandsplit filter functions. The
HT9170B and HT9170D types supply
power-down mode and inhibit mode operations.
All types of the HT9170 series use digital counting
techniques to detect and decode all the 16
DTMF tone pairs into a 4-bit code output.
Highly accurate switched capacitor filters are
employed to divide tone (DTMF) signals into
low and high group signals. A built-in dial tone
rejection circuit is provided to eliminate the
need for pre-filtering.

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