Logic device/transceiver/encoder

The MC74AC4040 consists of 12 master-slave flip-flops. The output of each flip-flop feeds the next flip-flop, with half the frequency at each output of the previous one. The state of the counter advances once on the negative going edge of the clock input. Reset is asynchronous and active high. Due to internal ripple delays, the state changes of the Q outputs do not occur simultaneously. Therefore, the decoded output signal is prone to decode spikes and may have to be gated with the MC74AC4040's clock for some designs.

8-Bit Shift Register with 3-State Output Register 16-TSSOP -40 to 125

The MC74VHC1G02 is an advanced high-speed CMOS 2-input NOR gate fabricated on a silicon gate CMOS process. The internal circuitry consists of multiple stages including a buffered output that provides high noise immunity and stable output. The MC74VHC1G02 input structure provides protection at applied voltages up to 5.5 V regardless of the supply voltage. So MC74VHC1G02 is used to interface 5 V circuit to 3 V circuit.