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DSA00140324.pdf
by Holtek
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HT9020 Call Progress Tone Decoder & ABR Controller Features · · · · · Low cost 32768Hz crystal Low power consumption Operating voltage: 2.5V to 5.5V (CPT mode) 2.0V to 5.5V (ABR mode) Ca
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busy tone
HT9020
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HT9020B
return to zero decoder