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The **74HC164D** is a high-speed CMOS device that offers pin compatibility with Low Power Schottky TTL (LSTTL) components. It functions as an 8-bit edge-triggered shift register, allowing serial data input and parallel output. The device accepts serial data through either of two inputs—DSA or DSB—and these inputs can be used to control each other. For optimal performance, the unused input should be tied high, and both inputs should never be left unconnected.
When the clock signal (CP) transitions from low to high, the data is shifted one bit to the right, and the new data is loaded into Q0. Q0 represents the logical AND of the two data inputs (DSA and DSB), ensuring that the setup time requirements are met before the rising clock edge.
An active low level on the main reset (MR) input will asynchronously clear all internal registers and force all outputs to a low state, overriding any other input signals.
### Key Features of 74HC164D:
- Gated serial data input
- Asynchronous master reset
- Complies with JEDEC standard No. 7A
- Excellent ESD protection:
- HBM EIA/JESD22-A114-B exceeds 2000 V
- MM EIA/JESD22-A115-A exceeds 200 V
- Available in multiple package types: DIP14, SO14, SSOP14, TSSOP14, and DHVQFN14
- Operates over a wide temperature range: -40°C to +85°C and -40°C to +125°C
### Pin Configuration and Functionality:
The **74HC164D** has a well-defined pin layout, making it easy to integrate into various digital circuits. Below is a summary of its key pins:
- **DS**: Serial data input
- **CP**: Clock input (rising edge triggers data shift)
- **MR**: Master reset (active low)
- **Q0–Q7**: Parallel output bits
### Pin Description:
For different package types like DIP14, SO14, SSOP14, and TSSOP14, the pin configuration remains consistent. The device allows for flexible use in both surface-mount and through-hole applications.
### Functional Table:
The functional table illustrates how the device behaves under different input conditions. It shows the relationship between the data inputs, clock, and output states. Understanding this table is essential for proper usage of the 74HC164D in shift register applications.
### Absolute Maximum Ratings:
The 74HC164D is designed to meet IEC 60134 standards for absolute maximum ratings. These include parameters such as power dissipation, operating voltage, and temperature limits. The maximum power dissipation (Ptot) decreases linearly with increasing temperature, depending on the package type:
- **DIP14**: Ptot drops at 12 mW/K above 70°C
- **SO14**: Ptot drops at 8 mW/K above 70°C
- **SSOP14 & TSSOP14**: Ptot drops at 5.5 mW/K above 60°C
- **DHVQFN14**: Ptot drops at 4.5 mW/K above 60°C
These specifications ensure reliable operation across a wide range of environmental conditions, making the 74HC164D a versatile choice for digital logic designs.