M-993 Region 1 MF Tone Generator Features • Generates standard CCITT R1 MF tones • Digital input control • Linear (analog) output • Power output capable of driving standard line • 14-pin DIP • Single 5-Volt supply • Inexpensive 3.
58 MHz time base Applications • Telephone systems • Test equipment Description The M-993 is a monolithic CMOS integrated circuit designed to generate multifrequency (MF) tone pairs for use in trunk signaling.
The tones generated conform to CCITT R1 signal recommendations and to AT&T MF standards.
The M-993 permits design engineers to implement a highly accurate MF sender with a minimum of space, power, and added components.
The accuracy of the tone frequencies is as...

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