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M 751
tOS/MOS INTEGRATED CIRCUIT
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PRELIMINARY DATA
~OUCH TONE GENERATOR
f' 2.5 to 5V SUPPLY
:. INTERNAL PULL-UP WITH DIODE PROTECTION ON ALL INPUTS ,. ON CHIP CRYSTAL CONTROLLED OSCILLATOR: 4.433619 MHz • INTERNAL CAPACITORS FOR THE CRYSTAL OSCILLATOR • LOW HARMONIC DISTORTION • HIGH BAND TONES PRE-EMPHASIS
The M751 can provide all tone frequency pairs required for the Touch Tone Dialling System. The output :frequencies are obtained from an internal crystal controlled oscillator whose frequency is reduced in two ,independent programmable counters. The dividing ratio is controlled by the selected key.
M751 Datasheet
