The 74VHC165FT is an advanced high speed CMOS 8-BIT PARALLEL/SERIAL-IN, SERIAL-OUT SHIFT REGISTER fabricated with silicon gate C^2MOS technology. It achieves the high speed operation similar to equivalent Bipolar Schottky TTL while maintaining the CMOS low power dissipation. It consists of parallel-in or serial-in, serial-out 8-bit shift register with a gated clock input. When the SHIFT/ LOAD/ input is held high, the serial data input is enabled and the eight frip-frops perform serial shifting with each clock pulse. When the SHIFT/LOAD/ input is held low, the parallel data is loaded synchronously into the register at positive going transition of the clock pulse.
The CK-INH input should be shifted high only when the CK input is held high.
An Input protection circuit ensures that 0 to 5.5 V can be applied to the input pins without regard to the supply voltage. This device can be used to interface 5 V to 3 V systems and on two supply systems such as battery back up. This circuit prevents device destruction due to mismatched supply and input voltages.
Wide operating temperature: Topr = -40 to 125 °C
High speed: fMAX = 150 MHz (typ.) at Vcc= 5 V
Low power dissipation: Icc = 4.0µA (max) at Ta = 25 °C
High noise immunity: Vnih = Vnil = 28 % Vcc (min)
Power down protection is provided on all inputs.
Balanced propagation delays: tPLH≈ tPHL
Wide operating voltage range: Vcc(opr) = 2.0 V to 5.5 V
Pin and function compatible with 74 series (74AC/HC/AHC ) 165 type