1. General Overview & Purpose

️· Device: MM54HC4017 / MM74HC4017 - This is a decade counter/decoder. It counts up to 10 and can be used to drive outputs in a specific sequence.
️· Application: Commonly used in applications such as driving displays, sequencing, and generating patterns.

2. Key Electrical Characteristics & Timing (Important Numbers)

I've summarized the most significant electrical characteristics and timing parameters. Note: This is a *selection* of parameters; the full datasheet contains many more. The data is split to account for different operating voltages.

️· Supply Voltage (Vcc): The document references several voltage levels that can be used.
️· Maximum Clock Frequency (fMAX): 30 MHz
️· Propagation Delay (tPHL, tPLH): These represent the time it takes for signals to propagate through the counter/decoder. Examples:
- tPHL (Enable to Carry Out) = 26-44 ns
- tPLH (Enable to Carry Out) = 27-44 ns
- tPHL (Reset to Decode Output) = 23-40 ns
️· Minimum Pulse Width (tW): 8-16 ns. This is the minimum time the clock signal needs to be high or low for the counter to register a count.
️· Minimum Reset Removal Time (tREM): 20-10 ns.
️· Input Setup Time (tS) & Hold Time (tH): These relate to the timing of the clock signal relative to the rising/falling edge of the enable signal.
️· Power Dissipation (CPD): A capacitance value influencing power consumption.

3. Package and Ordering Information

️· Packages: Dual-In-Line (DIL) and Flat packages are available.
️· Order Numbers: Specific part numbers like MM54HC4017J, MM74HC4017J, MM74HC4017N are provided for ordering.

4. Life Support Policy

️· Important Disclaimer: National Semiconductor has a policy stating that their products are *not* authorized for use in life-support devices unless explicitly approved. This is a standard disclaimer to prevent misuse of the components.

Important Notes:

️· Full Datasheet Required: This is just an excerpt. To design with this IC, you *must* consult the complete datasheet for all specifications, absolute maximum ratings, timing diagrams, and application information.
️· Voltage Levels: The datasheet likely contains multiple tables for different supply voltages (e.g., 3.3V, 5V). Make sure you're looking at the correct table for your design.
️· Timing Diagrams: Pay close attention to the timing diagrams to understand the proper sequence and timing of inputs and outputs.