LC66558A

The LC66558A is a kind of 4-bit microcontroller with  built-in 8 Kbyte ROM. It includes RAM, input/output ports, a serial interface, a comparator and timers in a single chip.

There are some features of LC66558A as follows. First is 8-bit serial interface which supports 16-bit cascade connection. The second is 1.96s minimum cycle time at 3.0 to 5.5 V, and 3.92s at 2.2 to 5.5 V. Then is 12-bit timer for timeout function, even counter pulse measurement and rectangular waveform generation. Next is 8-bit timer for timeout function, even counter, pulsewidth modulated output and rectangular waveform generation. The fifth is 12-bit prescaler for timebase function. The sixth is six external interrupt inputs. The seventh is five internal interrupt sources (two for the timers, two for the serial I/O and one for the prescale). The eighth is halt and hold modes for program-controlled powerdown. The last one is I/O pull up resistor and open-drain options.

What comes next is the absolute maximum ratings of LC66558A. The VDD (supply voltage) is from -0.3 to +7.0 V. The VI(1) (ports P2, P3 (excluding P33) and P6 input voltage) is from -0.3 to 15.0 V. The VI(2) (input voltage for all inputs) is from -0.3 to VDD+0.3 V. The VO(1) (ports P2, P3 (excluding P33), P6, P7 and PA output voltage) is from -0.3 to 15.0 V. The VO(2) (output voltage for all outputs) is from -0.3 to VDD+0.3 V. The Pd (power dissipation) is 600 mW for DIP64S and 430 mW for QIP64E. The Topr (operating temperature) is from -30 to +70. The Tstg (storage temperature) is from -55 to +125.