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The 74LS164N is a 8-bit serial-in, parallel-out shift register manufactured by Signetics.

Specifications:

• Logic Family: 74LS (Low-Power Schottky)
• Function: Serial-In, Parallel-Out Shift Register
• Number of Bits: 8
• Operating Voltage: 4.75V to 5.25V (5V nominal)
• Operating Temperature Range: 0°C to +70°C
• Clock Frequency: Up to 36 MHz (typical)
• Propagation Delay: 20 ns (typical)
• Power Dissipation: 80 mW (typical)
• Input/Output Compatibility: TTL
• Package: 14-pin DIP (Dual In-line Package)

Descriptions:

• The 74LS164N accepts serial data input and shifts it through its 8-bit register on each rising edge of the clock pulse.
• It has two serial inputs (A and B), which are ANDed together, meaning both must be high for a logical '1' to be shifted in.
• The outputs are parallel (Q0 to Q7), allowing data to be read simultaneously.
• Features a Master Reset (MR, active LOW) to clear all outputs to '0'.

Features:

• 8-bit serial-to-parallel conversion
• Synchronous operation with clock input
• Buffered inputs and outputs
• Direct clear (reset) capability
• Low power consumption (LS series)
• TTL-compatible inputs and outputs

This IC is commonly used in applications such as LED displays, data storage, and serial-to-parallel conversion in digital circuits.

(Note: Signetics was later acquired by NXP Semiconductors, but the original part remains available under the Signetics branding in some markets.)