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Manufacturer: Texas Instruments (TI)

Part Number: SN74LS166AN

#### Descriptions:

• Type: 8-Bit Parallel-In/Serial-Out Shift Register
• Logic Family: LS (Low-Power Schottky)
• Technology: TTL (Transistor-Transistor Logic)
• Package: PDIP-16 (Plastic Dual In-Line Package, 16 pins)

#### Key Features:

• Parallel-to-Serial Data Conversion: Loads 8 bits in parallel and shifts them out serially.
• Synchronous Operation: Controlled by a shared clock (CLK) input.
• Asynchronous Clear: Active-low clear (CLR) resets the register.
• Serial Data Input: Allows cascading multiple devices.
• Clock Inhibit (CLK INH): Pauses shifting without stopping the clock signal.
• Supply Voltage Range: 4.75V to 5.25V (standard TTL levels).
• Operating Temperature Range: 0°C to 70°C (commercial grade).

#### Applications:

• Data storage and transfer systems
• Serial-to-parallel conversion in digital circuits
• Industrial control and communication systems

#### Pin Configuration (PDIP-16):

1. SER (Serial Data Input)

2. QA (Parallel Data Input A)

3. QB (Parallel Data Input B)

4. QC (Parallel Data Input C)

5. QD (Parallel Data Input D)

6. QE (Parallel Data Input E)

7. QF (Parallel Data Input F)

8. QG (Parallel Data Input G)

9. QH (Parallel Data Input H)

10. GND (Ground)

11. SH/LD (Shift/Load Control)

12. CLK (Clock Input)

13. CLK INH (Clock Inhibit)

14. CLR (Clear, Active Low)

15. QH' (Serial Output)

16. VCC (Supply Voltage)

#### Additional Notes:

• Compatible with other TTL logic families.
• Requires external pull-up resistors for open-collector outputs if used.

This information is strictly factual, based on TI’s official datasheet for the SN74LS166AN.