The 74LS164 is an 8-bit edge-triggered shift register that accepts data serially and outputs it in parallel. It features two serial input lines, DSA and DSB, which can be used independently or connected together. One of the inputs can act as a high-level enable to control the other, ensuring proper data flow. Unused inputs should be tied high and not left floating to avoid instability.
This shift register includes an AND gate for enabling the serial input and an asynchronous reset pin. When the reset is low, all outputs are cleared regardless of other signals. When reset is high, data is shifted into the register on the rising edge of the clock signal, moving from the first bit to the eighth.
Key features of the 74LS164 include:
- Wide operating voltage range: 2V to 6V
- Output can drive up to 10 LSTTL loads
- Typical propagation delay (Tpd): 20ns
- Output current: ±4mA at 5V
- Serial input with gate enable control
- Buffer circuits on both clock and serial input
- Direct asynchronous reset
The 74LS164 comes in various packages such as DIP14, SO14, SSOP14, TSSOP14, and DHVQFN14. Each package has different thermal dissipation characteristics, with power consumption decreasing linearly as temperature increases.
The pin diagram shows the arrangement of the 14 pins, including the clock (CLK), serial data input (DSA/DSB), output bits (Q0–Q7), and the reset (MR) pin. Understanding the pin functions is essential for proper integration into digital circuits.
In terms of electrical characteristics, the 74LS164 operates reliably across a wide range of voltages and temperatures. Its conversion characteristics ensure stable performance when translating input signals to output states.
The logic block diagram illustrates the internal structure, showing how data moves through the shift register stages. The timing diagram highlights the sequence of operations, including the required setup and hold times for reliable data transfer.
Whether you're building a simple LED display or a more complex digital system, the 74LS164 offers a flexible and efficient way to handle serial-to-parallel data conversion. Its robust design and ease of use make it a popular choice among electronics enthusiasts and engineers alike.
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