M54HC251M74HC251 is an 8-bit SIPO shift register with a wide operating voltage range of 2V-6V and high speed and low power consumption.
The SGS‑Thomson M54HC251 and M74HC251 are high‑speed CMOS 8‑bit SIPO shift registers with low power dissipation and wide operating voltage range. They feature true (Y) and complementary (W) outputs, a STROBE input for enable control, and protection against static discharge.
The document provides detailed pin descriptions, absolute maximum ratings, recommended operating conditions, DC and AC electrical specifications, mechanical dimensions for plastic and ceramic DIP packages, and switching characteristic test waveforms. It also includes a truth table and logic diagram for functional reference.
| Typical propagation delay (tpp) | 14 ns |
|---|---|
| Output drive capability | 4 mA (MIN.) |
| Power dissipation | 500 mW |
| Storage temperature range | -65 °C to +150 °C |
| Lead temperature (10 s) | 300 °C |
| Input high‑level voltage (VIH) | 2.0 V (typ.) |
The typical propagation delay (tpp) is 14 ns.
The maximum power dissipation is 500 mW.