HCD404669 microcomputers equivalent, low-voltage as microcomputers.
* 1,152-digit × 4-bit RAM
* I/O pins: 47 High-current I/O pins (source: 10 mA max.): 4 High-current I/O pins (sink: 15 mA max.): 5
* Timer counters: 3
The HD404669 Series microcomputers incorporate a DTMF generation circuit, two comparators, and a serial interface on chip. They also provide input and output pins with large current handling capacities. Thus they are 4-bit single-chip microcomputers .
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