MV5089 Datasheet (Plessey)

MV5089, DTMF Generator

Voo Positive Power Supply TONE DISABLE This input has an internal pull-up resistor to Voo.

When connected to Vss no tones are generated by any key depression allowing the keyboard to be used for purposes other than DTMF signalling.

COLUMN 1-4 These CMOS inputs are held at Voo by an internal pu

MV5089 MV5089 DTMF GENERATOR The MV5089 is fabricated using Plessey Semiconductors' ISO-CMOS high density technology and offers low power and wide voltage operation.

An inexpensive 3.58MHz TV crystal completes the reference oscillator.

From this frequency are derived 8 different sinusoidal frequencies which, when appropriately mixed, provide Dual-Tone MultiFrequency (DTMF) tones.

Inputs are compatible with a standard 2-of-8 active-low keyboard and the keyboard entries determine the correct div

MV5089 Features

* Pin-far-Pin Replacement for MK5089

* Low Standby Power

* Minimum External Parts Count

* 2.75V to 10V. Operation

* 2-of-8 Keyboard Input

* High Accuracy Tones Provided by 3.58MHz Crystal Oscillator

* Pin-Selectable Inhibit of Single Tone Gener