Synchronous Presettable 4-Bit Binary Counter
TC74AC161P/F/FT Asynchronous Clear
TC74AC163P/F/FT Synchronous Clear

The TC74AC161 and 163 are advanced high speed CMOS SYNCHRONOUS PRESETTABLE COUNTERs fabricated with silicon gate and double-layer metal wiring C2MOS technology.
They achieve the high speed operation similar to equivalent Bipolar Schottky TTL while maintaining the CMOS low power dissipation.

FEATUREs
•  High speed: fmax= 170 MHz (typ.) at VCC= 5 V
•  Low power dissipation: ICC= 8 μA (max) at Ta = 25°C
•  High noise immunity: VNIH= VNIL= 28% VCC(min)
•  Symmetrical output impedance: |IOH| = IOL= 24 mA (min)
                                             Capability of driving 50 Ω transmission lines.
•  Balanced propagation delays: tpLH∼  − tpHL
•  Wide operating voltage range: VCC (opr)= 2 to 5.5 V
•  Pin and function compatible with 74F161/163