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The **74HC164D** is a high-speed CMOS device that is pin-compatible 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 data through either of two inputs—DSA or DSB—and these can be used to control each other, with one acting as an enable signal. Both inputs should either be connected together or left at a high level; leaving them unconnected is not recommended.
When the clock (CP) transitions from low to high, the data shifts right by one bit, and the new value is loaded into Q0. Q0 represents the logical AND of both DSA and DSB, ensuring the setup time requirement is met before the rising clock edge.
A low-level signal on the main reset (MR) input will asynchronously clear all registers and force all outputs to a low state, overriding any other inputs.
**Key Features of 74HC164D:**
- Gated serial data input
- Asynchronous master reset
- Complies with JEDEC standard no. 7A
- ESD protection:
- HBM EIA/JESD22-A114-B exceeds 2000 V
- MM EIA/JESD22-A115-A exceeds 200 V
- Available in multiple package types
- Operates over extended temperature ranges: -40°C to +85°C and -40°C to +125°C
**Model Identification and Main Parameters:**
[Image: 74HC164D pin diagram and function]
**Pin Diagram and Description:**
[Image: 74HC164D pin diagram]
**Pin Configuration for DIP14, SO14, SSOP14, and TSSOP14 Packages:**
- **Pin 1:** Data Input A (DSA)
- **Pin 2:** Data Input B (DSB)
- **Pin 3:** Clock Input (CP)
- **Pin 4:** Master Reset (MR)
- **Pins 5–12:** Output Pins (Q0–Q7)
- **Pin 13:** Power Supply (VCC)
- **Pin 14:** Ground (GND)
**Function Table:**
[Image: 74HC164D function table]
**Notes on Symbols:**
- **H = HIGH level**
- **h = LOW-to-HIGH transition before a HIGH level setup time**
- **L = LOW level**
- **l = LOW level before a LOW-to-HIGH clock transition**
- **q = previous state of referenced input before clock transition**
- **↑ = LOW-to-HIGH clock transition**
**Absolute Maximum Ratings:**
[Image: 74HC164D limit values]
These ratings comply with IEC 60134 standards, with voltage measured relative to ground (0 V).
- For **DIP14**: Ptot decreases linearly by 12 mW/K above 70°C.
- For **SO14**: Ptot decreases linearly by 8 mW/K above 70°C.
- For **SSOP14** and **TSSOP14**: Ptot decreases linearly by 5.5 mW/K above 60°C.
- For **DHVQFN14**: Ptot decreases linearly by 4.5 mW/K above 60°C.
The 74HC164D is ideal for applications requiring efficient data shifting, such as LED displays, digital counters, and communication interfaces. Its robust design and wide operating temperature range make it suitable for industrial and commercial use.