Six Decade Counter / Display Decoder Not Recommended For New Designs - Micrel Semiconductor

The MIC50395 is an ion-implanted, P-channel MOS six- decade synchronous up/down-counter Display driver with compare-register and storage-latches. The Counter as well as the Register CAN be loaded digit-by-digit with BCD data. The Counter has an asynchronous-clear function. Scanning is controlled by the scan Oscillator input which is self-oscillating or CAN be driven by an external signal. The six-decade Register is constantly compared to the state of the six-decade Counter and when both the Register and the Counter have the same content, an EQUAL signal is gener- ated. The contents of the Counter CAN be transferred into the 6-digit latch which is then multiplexed from MSD to LSD in BCD and 7-segment format to the output. The seven- segment decoder incorporates a leading-zero blanking circuit which CAN be disabled by an external signal. This device is intended to Interface directly with the standard CMOS Logic families. The MIC50396 and MIC50397 operate identically to the MIC50395 except that two digits in each were reprogrammed to provide divide by six circuitry instead of divide by ten. The MIC50396 is well suited for industrial Timer applications while the MIC50397 is best suited for stop watch or real time computer Clock applications. By Micrel Semiconductor