HD74HC4022

HD74HC4022 Octal Counters/Dividers Description The HD74HC4022 is a four-stage Johson octal counter with built-in code converter. High speed operation and spike-free outputs are obtained by use of a Johson octal counter design. The eight decoded outputs are normally low, and go high only at their appropriate octal time period. The output changes occur on the positive-going edge of the clock pulse. This part can be used in frequency division application as well as octal counter or octal decode display applications. Features High Speed Operation High Output Current: Fanout of 10 LSTTL Loads Wide Operating Voltage: VCC = 2 to 6 V Low Input Current: 1 µA max Low Quiescent Supply Current: ICC (static) = 4 µA max (Ta = 25°C) Function Table Clock L X Clock Enable X H L X H X X X: Irrelevant n < 4 ··· Carry = H n ≥ 4 ··· Carry = L X Reset L L L L L L H Output n n n n+1 n n+1 n Q0 HD74HC4022 Pin Arrangement Q1 Q0 Q2 Q5 Q6 NC Q3 GND 1 2 3 4 5 6 7 8 (Top view) Q3 Q0 Q2 Q5 Q6 Q1 R C CE Cout Q4 Q7 16 VCC 15 Reset 14 Clock 13 Clock enable 12 Cout 11 Q4 10 Q7 9 NC Logic Diagram D CK R Q Q Q0 Q1 Q2 D CK R Q Q3 Q Q4 D CK R Q Q Q5 Q6 Q7 Clock enable Clock D CK R Q Q Cout Reset 2 HD74HC4022 DC Characteristics Ta = 25°C Item Input voltage Symbol VIH Ta = –40 to +85°C Max — — — 0.5 1.35 1.8 — — — — — 0.1 0.1 0.1 0.33 0.33 ±1.0 40 µA µA I OL = 4 mA I OL = 5.2 mA Vin = VCC or GND Vin = VCC or GND, Iout = 0 µA V I OH = –4 mA I OH = –5.2 mA Vin = VIH or VIL I OL = 20 µ...