Overview
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.
Key Specifications
| Parameter | Symbol | Test Conditions | Units | Min | Max | |
|---|---|---|---|---|---|---|
| Maximum CP Frequency | fMAX | VCC = 4.5V, 25°C | MHz | 30 | - | 20 |
| CP Width (Low) | tW(L) | VCC = 4.5V, 25°C | ns | 16 | - | 24 |
| MR Pulse Width (161) | tW | VCC = 4.5V, 25°C | ns | 20 | - | 30 |
| Setup Time, Pn to CP | tSU | VCC = 4.5V, 25°C | ns | 10 | - | 15 |
| Operating Temperature Range | - | - | °C | -55 | - | 125 |
| Power Supply Voltage | VCC | - | V | 4.5 | - | 5.5 |
| Input Capacitance | CIN | - | pF | - | 10 | - |
Key Features
- 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.
Applications
- 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.
Q & A
- 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. - What is the operating voltage range of the CD74HCT161ME4?
The operating voltage range of the CD74HCT161ME4 is from 4.5V to 5.5V. - What type of reset does the CD74HCT161ME4 have?
The CD74HCT161ME4 has an asynchronous reset capability. - How many count enable inputs does the CD74HCT161ME4 have?
The CD74HCT161ME4 has two count enable inputs (PE and TE) for n-bit cascading. - 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. - What is the operating temperature range of the CD74HCT161ME4?
The operating temperature range of the CD74HCT161ME4 is from -55°C to 125°C. - 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. - 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. - What is the input capacitance of the CD74HCT161ME4?
The input capacitance of the CD74HCT161ME4 is approximately 10 pF. - Is the CD74HCT161ME4 sensitive to electrostatic discharge?
Yes, the CD74HCT161ME4 is sensitive to electrostatic discharge, and users should follow proper IC handling procedures.
