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PCD4421 Microcomputer Dialing Integrated Circuit

2015-01-03 13:31  
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PCD4421 Microcomputer Dialing Integrated Circuit
PCD4421 is the microcomputer dial-up integrated circuit produced by Dutch philips company and it is used in communication equipment and dial-up circuit. PCD4421 integrated circuit containins a number of frequent generating circuit, R key control circuit, the keyboard switch circuit and noise control decoding static circuit etc. This IC adopts feet 18 DIP package and the pins functions and data are shown as table 1. Table 1:Pins Fuctions and Data ofPCD4421 IC