Texas Instruments CD74HCT161ME4

The CD74HCT161ME4 is a 4-bit binary counter with asynchronous reset, manufactured by Texas Instruments. This component is part of the 74HCT series, which is known for its high-speed CMOS logic and compatibility with TTL (Transistor-Transistor Logic) systems. The device operates within a voltage range of 4.5V to 5.5V, making it suitable for a variety of digital circuit applications. It features synchronous counting and loading capabilities, along with two count enable inputs for n-bit cascading, which simplifies the process of serially connecting multiple counters.

• 4-Bit Binary Counter with Asynchronous Reset: The CD74HCT161ME4 features a 4-bit binary counter with an asynchronous reset capability, allowing for immediate clearing of the counter regardless of the clock state.
• Synchronous Counting and Loading: The device supports synchronous counting and loading, enabling precise control over the counter's state.
• Two Count Enable Inputs: It includes two count enable inputs (PE and TE) for n-bit cascading, facilitating the connection of multiple counters in series.
• Look-Ahead Carry for High-Speed Counting: The look-ahead carry feature enhances the speed of counting by anticipating the carry from the previous stage.
• Wide Operating Temperature Range: The component operates over a wide temperature range of -55°C to 125°C.
• Balanced Propagation Delay and Transition Times: It offers balanced propagation delay and transition times, ensuring consistent performance across different operating conditions.
• Significant Power Reduction: Compared to LSTTL logic ICs, the CD74HCT161ME4 offers significant power reduction.

• Digital Multiplexing and Demultiplexing: The counter can be used in digital multiplexing and demultiplexing circuits to manage multiple data streams.
• Signal Gating: It can be employed in signal gating applications to control the flow of digital signals.
• Frequency Dividing Circuits: The CD74HCT161ME4 is suitable for frequency dividing circuits, where it can divide the input clock frequency by a factor of 16.
• Time Delay Circuits: It can be used in time delay circuits to introduce a specific delay in digital signals.

1. What is the maximum operating frequency of the CD74HCT161ME4?
   The maximum operating frequency of the CD74HCT161ME4 is up to 30 MHz at VCC = 4.5V and 25°C.
2. What is the operating voltage range of the CD74HCT161ME4?
   The operating voltage range of the CD74HCT161ME4 is from 4.5V to 5.5V.
3. What type of reset does the CD74HCT161ME4 have?
   The CD74HCT161ME4 has an asynchronous reset capability.
4. How many count enable inputs does the CD74HCT161ME4 have?
   The CD74HCT161ME4 has two count enable inputs (PE and TE) for n-bit cascading.
5. What is the look-ahead carry feature in the CD74HCT161ME4?
   The look-ahead carry feature in the CD74HCT161ME4 simplifies serial cascading of counters by anticipating the carry from the previous stage.
6. What is the operating temperature range of the CD74HCT161ME4?
   The operating temperature range of the CD74HCT161ME4 is from -55°C to 125°C.
7. How does the CD74HCT161ME4 reduce power consumption compared to LSTTL logic ICs?
   The CD74HCT161ME4 offers significant power reduction compared to LSTTL logic ICs due to its CMOS technology.
8. What are some common applications of the CD74HCT161ME4?
   The CD74HCT161ME4 is commonly used in digital multiplexing and demultiplexing, signal gating, frequency dividing circuits, and time delay circuits.
9. What is the input capacitance of the CD74HCT161ME4?
   The input capacitance of the CD74HCT161ME4 is approximately 10 pF.
10. Is the CD74HCT161ME4 sensitive to electrostatic discharge?
    Yes, the CD74HCT161ME4 is sensitive to electrostatic discharge, and users should follow proper IC handling procedures.