Product Summary
The TC74HC74AF is a high speed CMOS D flip flop fabricated with silicon gate C2MOS technology. The TC74HC74AF achieves the high speed operation similar to equivalent LSTTL while maintaining the CMOS low power dissipation. The signal level applied to the D INPUT is transferred to Q OUTPUT during the positive going transition of the CLOCK pulse.
Parametrics
TC74HC74AF absolute maximum ratings: (1)Supply voltage range VCC: -0.5 to 7 V; (2)DC input voltage VIN: -0.5 to VCC + 0.5 V; (3)DC output voltage VOUT: -0.5 to VCC + 0.5 V; (4)Input diode current IIK: ±20 mA; (5)Output diode current IOK: ±20 mA; (6)DC output current IOUT: ±25 mA; (7)DC VCC/ground current ICC: ±50 mA; (8)Power dissipation PD: 500 (DIP)(Note 2)/180 (SOP)mW; (9)Storage temperature Tstg: -65 to 150 °C.
Features
TC74HC74AF features: (1)High speed: fmax = 77 MHz (typ.)at VCC = 5 V; (2)Low power dissipation: ICC = 2 μA (max)at Ta = 25°C; (3)High noise immunity: VNIH = VNIL = 28% VCC (min); (4)Output drive capability: 10 LSTTL loads; (5)Symmetrical output impedance: |IOH| = IOL = 4 mA (min); (6)Balanced propagation delays: tpLH -tpHL; (7)Wide operating voltage range: VCC (opr)= 2~6 V; (8)Pin and function compatible with 74LS74.
Diagrams

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(China (Mainland))










