1. General Description:

️· The SL74HC164 is a low-power, high-speed CMOS 4-bit shift register with parallel data input. It's used for serial-to-parallel data conversion, data storage, and general-purpose shift register applications.

2. Key Specifications:

️· Supply Voltage (VCC): Typically operates from 2.0V to 6.0V.
️· Maximum Clock Frequency (fmax):
- 2.0V: 6 MHz
- 4.5V: 30 MHz
- 6.0V: 35 MHz
️· Propagation Delay (tPLH, tPHL): (Clock to Q) - varies with voltage. Generally around 175ns (2V) to 30ns (6V).
️· Input Voltage Levels:
- Vih (Minimum High): 1.5V (2V), 3.15V (4.5V), 4.2V (6V)
- Vil (Maximum Low): 0.3V (2V), 0.9V (4.5V), 1.2V (6V)
️· Input Leakage Current (IIN): ±1.0 µA (maximum) at 6.0V.
️· Quiescent Supply Current (ICC): 8.0 µA (max) at 6.0V.
️· Input Capacitance (CIN): 10pF (maximum)
️· Power Dissipation Capacitance (CPD) 140pF (typical)

3. Timing Parameters (Important for proper operation):

️· Setup Time (tSU): Minimum time required for the data input to be stable *before* the rising edge of the clock. Varies with voltage, generally 50ns (2V) to 9ns (6V).
️· Hold Time (th): Minimum time the data input must remain stable *after* the rising edge of the clock. 5ns.
️· Pulse Width (tw) for Reset & Clock: Minimum pulse duration for the reset and clock signals. Varies with voltage, generally 80ns (2V) to 14ns (6V).
️· Rise/Fall Time (tr/tf): Maximum acceptable rise and fall times of input signals. 1000ns (2V), 400ns (6V).



4. Key Features & Characteristics:

️· CMOS Technology: Low power consumption.
️· Parallel/Serial Input: Supports both parallel and serial data input.
️· 4-Bit Shift Register: Stores and shifts 4 bits of data.
️· Wide Operating Voltage: 2V to 6V.

5. Figures & Diagrams:

️· The datasheet includes waveforms, timing diagrams, and test circuit diagrams that illustrate the operation and timing relationships of the device.



In essence, the SL74HC164 is a versatile, low-power shift register suitable for a variety of digital logic applications where serial-to-parallel conversion or data storage is required. The datasheet provides detailed specifications and timing information that must be considered when designing circuits using this device.