The UM91214/15 is a single-chip,sillcon gate,cmos integrated circuit with an on-chip oscillator for a 3.58 MHz crystal or ceramic resonator.It provides dialing pulse (DP) or dual tone multi-frequency (DTMF) dialing.A standard 4×4 matrix keyboard can be used to support either DP or DTMF modes.up to 32 digits can be saved in the on-chip RAM for redialing.In the DTMF mode, minimum tone duration and minimum intertone pause provide for rapid dialing.maxmum tone duration is dependent upon the key depression time in manual dialing.
Features91215 Gate
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