MV5089 Datasheet - GEC Plessey

MV5089 DTMF Generator

1 VDD Positive Power Supply 2 TONE This input has an internal pull-up resistor to VDD. When connected to VSS no DISABLE tones are generated by ant key depression allowing the keyboard to be used for purposes other than DTMF signalling. 3,4,5,9 6 7,8 Column 1-4 VSS OSC In, OSC Out These C.

MV5089 MV5089 DTMF GENERATOR DS3126-2.0 June 1993 The MV5089 is fabricated using 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 Multi-Frequency (DTMF) tones. Inputs are compatible with a standard 2-of-8 active-low keyboard and the keyboard entries determine the correct divi.

MV5089 Features

* s Pin-for-Pin Replacement for MK5089 s Low Standby Power s Minimum External Parts Count s 2.75V to 10V Operatlon s 2-of-8 Keyboard Input s High Accuracy Tones Provided by 3.58MHz Crystal Oscillator s Pin-Selectable Inhibit of Single Tone Generation Figure 1: Pin connections - top view APPLICATIONS

MV5089_GECPlessey.pdf