The TC74AC166 is an advanced high speed CMOS 8-BIT PARALLEL/SERIAL-IN, SERIAL-OUT SHIFT REGISTER fabricated with silicon gate and double-layer metal wiring C2MOS technology.
The TC74AC166 family provides an 8‑bit parallel/serial‑in, serial‑out shift register with a gated clock, clear input, and high‑speed CMOS performance comparable to bipolar Schottky TTL. It supports both parallel and serial loading modes controlled by the SHIFT/LOAD input and includes protection against static discharge.
Key specifications include a typical maximum frequency of 170 MHz, low supply current (8 µA max at 25 °C), wide supply voltage range (2.0‑5.5 V), and robust output drive capability (24 mA min). The device is offered in DIP‑16, SOP‑16, and SOL‑16 packages with typical weights of 1.00 g, 0.18 g, and 0.13 g respectively, and operates over –40 °C to 85 °C.
| Maximum operating frequency | 170 MHz (typ.) |
|---|---|
| Supply current (Icc) | 8 µA (max) at 25 °C |
| Noise immunity | VNIH = VNIL = 28 % Vcc (min) |
| Output drive capability | 24 mA (min) |
| Supply voltage range | 2.0 V to 5.5 V |
| Power dissipation | 500 mW (DIP) / 180 mW (SOP) |
| Operating temperature | -40 °C to 85 °C |
| DIP‑16 package weight | 1.00 g (typ.) |
| SOP‑16 package weight | 0.18 g (typ.) |
| SOL‑16 package weight | 0.13 g (typ.) |
The device can operate up to a typical maximum frequency of 170 MHz.
It operates with a supply voltage from 2.0 V to 5.5 V.
Maximum power dissipation is 500 mW for the DIP package and 180 mW for the SOP package.