74HC series ICs are High-speed logic gates with very low power consumption that utilize advanced silicon-gate CMOS technology and 74HC390 is one of them. 74HC390 ICs is a dual decade counter which contains two independent ripple counters. The counter has four separate sections. The counter has two divide-by-2 sections and two divide-by-5 sections. Divide-by-2 sections share a common asynchronous master reset input ( 1MR ) and divide-by-5 sections also share another one ( 2MR ). These sections are normally used in a BCD decade or bi-quinary configuration. Divide-by-2 section and divide-by-5 section have separate Low to High triggered clock. The various combination can achieve a single divide by 100 counter. The 74HC390 ICs have a wide operating range of VCC from 2 V to 6 V. Maximum current consumption is 160 uA through Icc and 1 uA per input pin. And the propagation delay is 14 ns. They can drive 10 LS-TTL loads at a time. Which means that the output pin of the counter can drive 10 TTL based Low-Power Schottky( LS ) input pins. They can provide 4 mA on outputs at 5 V VCC. They allow inputs and outputs up to VCC. Recommended operating VCC is 5 V. Load Current can reach up to 25 mA per output pin and 50 mA for overall pins in between 0 V to VCC. 

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