MC145412P

The MC145412P is a type of silicon gate, monolithic CMOS integrated circuits which convert keyboard inputs into eit her pulse or DTMF outputs. It is packaged in a standard 18 pin (0.3 wide)plastic DIP.

Features of the MC145412P are:(1)3×4 or 4×4 keyboard compatibility which allows the use of 2-of-7,2-of-8,or form A type keyboard;(2)single pin switch between DTMF,10 pps and 20 pps;(3)500Hz torn signal output in the pulse dial ing mode;(4)memory storage for ten 18 digital numbers, including last number redial;(5)uses 3.579545 MHz color burst crystal;(6)telephone line powered;(7)silicon gate CMOS technology for 1.7-5.5V low operation;(8)stand alone DTMF dialer/stand alone pulse dialer;(9)mute output used to isolate receiver from dialing output.

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