Overview
The CD74HCT161MG4 is a High Speed CMOS Logic 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) levels. The CD74HCT161 is designed for synchronous counting and loading, making it suitable for a variety of digital circuit applications.
Key Specifications
| Parameter | Value | Units | Conditions |
|---|---|---|---|
| Maximum CP Frequency | 30 (typ), 20 (min) | MHz | VCC = 4.5V, 25°C |
| CP Width (Low) | 16 (typ), 20 (max) | ns | VCC = 4.5V, 25°C |
| MR Pulse Width | 20 (typ), 25 (max) | ns | VCC = 4.5V, 25°C |
| Setup Time, Pn to CP | 10 (typ), 13 (max) | ns | VCC = 4.5V, 25°C |
| Setup Time, PE or TE to CP | 10 (typ), 13 (max) | ns | VCC = 4.5V, 25°C |
| Hold Time, PN to CP | 3 (typ), 3 (max) | ns | VCC = 4.5V, 25°C |
| Operating Temperature Range | -55°C to 125°C | °C | |
| Input Leakage Current | ±1 µA (max) | µA | VCC = 4.5V, 25°C |
| Quiescent Device Current | 80 µA (max) | µA | VCC = 4.5V, 25°C |
Key Features
- Synchronous Counting and Loading: The CD74HCT161 supports synchronous counting and loading, making it efficient for sequential logic applications.
- Asynchronous Reset: The counter has an asynchronous reset feature, allowing immediate reset of the counter to zero.
- Two Count Enable Inputs: This feature allows for n-bit cascading, enabling the creation of larger counters.
- Look-Ahead Carry for High-Speed Counting: This feature enhances the speed of the counter by reducing the propagation delay.
- Wide Operating Temperature Range: The component operates over a wide temperature range of -55°C to 125°C.
- Balanced Propagation Delay and Transition Times: Ensures consistent and reliable operation across different conditions.
- Significant Power Reduction: Compared to LSTTL (Low-power Schottky Transistor-Transistor Logic), this component offers reduced power consumption.
Applications
- Digital Counters and Timers: Suitable for applications requiring precise counting and timing functions.
- Sequential Logic Circuits: Ideal for use in sequential logic circuits where synchronous counting is necessary.
- Automated Systems: Can be used in automated systems that require accurate and high-speed counting.
- Communication Equipment: Useful in communication equipment where precise timing and counting are critical.
Q & A
- What is the maximum operating frequency of the CD74HCT161?
The maximum operating frequency of the CD74HCT161 is typically 30 MHz at VCC = 4.5V and 25°C.
- What is the asynchronous reset feature in the CD74HCT161?
The asynchronous reset feature allows the counter to be reset to zero immediately, regardless of the clock signal.
- What is the operating temperature range of the CD74HCT161?
The operating temperature range of the CD74HCT161 is -55°C to 125°C.
- How many count enable inputs does the CD74HCT161 have?
The CD74HCT161 has two count enable inputs, allowing for n-bit cascading).
- What is the look-ahead carry feature in the CD74HCT161?
The look-ahead carry feature reduces the propagation delay, enabling high-speed counting).
- Is the CD74HCT161 compatible with TTL levels?
Yes, the CD74HCT161 is compatible with TTL levels, making it versatile for various digital circuit applications).
- What is the typical quiescent device current of the CD74HCT161?
The typical quiescent device current of the CD74HCT161 is 80 µA at VCC = 4.5V and 25°C).
- Can the CD74HCT161 be used in automated systems?
Yes, the CD74HCT161 can be used in automated systems that require accurate and high-speed counting).
- Is the CD74HCT161 suitable for communication equipment?
Yes, the CD74HCT161 is suitable for communication equipment where precise timing and counting are critical).
- What is the package type of the CD74HCT161MG4?
The CD74HCT161MG4 is available in a SOIC (Small Outline Integrated Circuit) package).
