SN74HC166PWR

SN74HC166PWR is TI’s RoHS-compatible version of the 74HC166: an 8-bit shift register with parallel-load capability. It can operate as a serial-in, parallel-out register or as a parallel-load register that captures 8 bits from a data bus. Key features:
- 8-bit register with parallel data inputs and parallel outputs (Q0–Q7)
- Clock input for shifting data; a load input to capture the 8 data inputs in one operation
- Optional serial input for shifting in new bits (while not loading)
- CMOS technology, typically 2–6 V supply range (commonly 5 V)
- Small 14-pin package variants (PWR suffix indicates a RoHS-compliant option)
How it works (high level): when the load control is asserted, the 8 data inputs are loaded into the register. When load is not asserted, the device shifts data on each clock edge, producing updated parallel outputs. This makes it useful for data buffering, display driving, keyboard scanning, and other digital data-shaping tasks.
Always consult the exact datasheet for pinout, timing diagrams, and active-high/low control levels for the specific package variant.

Equivalent products to TI SN74HC166PWR (8-bit parallel-load/shift register) include:
- 74HC166 family from other vendors (e.g., ST74HC166, NXP 74HC166, Onsemi MC74HC166)
- 74HCT166 (TTL-compatible inputs)
- 74LS166 (older TTL version)
- 74AC166 / 74ACT166 (high-speed CMOS)
They offer similar function and pinout; verify packaging (PWR vs. other packages) for exact cross‑compatibility.

- 8-bit serial-in, parallel-out (SIPO) shift register
- Serial data input (DS) and eight parallel data inputs (A0–A7) for parallel loading
- SH/LD control to select shift mode or parallel load mode
- CP clock input; data shifts on clock edges
- Outputs Q0–Q7 present the register contents in parallel
- Wide supply range: 2 V to 6 V (HC family), typically 5 V
- High-speed CMOS with low static power
- Available in PWR variants/package options for standard power supply pins
Note: SH/LD polarity and exact pin naming may vary by package; always consult the specific datasheet for pinout.

- Pin count: 14 pins (DIP-14/SO-14).
- Function: SN74HC166PWR is a 4-bit universal shift register with parallel-load capability. It can load 4-bit parallel data (D0–D3) or shift data serially with a clock, and provides 4 outputs (Q0–Q3) with an asynchronous clear.

- Manufacturer: Texas Instruments (TI).
- What kind of company: TI is an American multinational technology company that designs and manufactures semiconductors and integrated circuits for a wide range of electronic applications. It’s one of the world’s largest semiconductor producers.

SN74HC166PWR is an 8-bit serial-in, parallel-out shift register. Common applications:
- Serial-to-parallel data conversion (e.g., convert SPI/UART serial data into an 8-bit bus).
- Microcontroller I/O expansion and buffering (daisy-chainable to widen data paths).
- Pattern loading for LED displays/LED matrices and simple display drivers.
- Data acquisition and timing circuits where a serial stream is captured and presented in parallel.
- Shift-register based delay/sequence generation and small data-storage in test equipment and control logic.

SOIC-14 (Plastic Small-Outline) 14-pin, surface-mount package.