Overview
The CD74HCT161MT is a high-speed CMOS logic presettable 4-bit binary counter produced by Texas Instruments. This device is part of the 74HCT series, which is compatible with TTL (Transistor-Transistor Logic) input levels. The CD74HCT161MT features asynchronous reset and is designed for high-speed counting applications. It operates within a wide temperature range of -55°C to 125°C, making it suitable for various environmental conditions.
Key Specifications
| Parameter | Value | Units | Conditions |
|---|---|---|---|
| Operating Voltage Range | 4.5 to 5.5 | V | |
| Maximum CP Frequency | 30 | MHz | VCC = 4.5V |
| CP Width (Low) | 16 to 24 | ns | VCC = 4.5V |
| MR Pulse Width | 20 to 30 | ns | VCC = 4.5V |
| Setup Time, Pn to CP | 10 to 15 | ns | VCC = 4.5V |
| Setup Time, PE or TE to CP | 13 to 20 | ns | VCC = 4.5V |
| Temperature Range | -55 to 125 | °C | |
| Package Type | 16 Ld SOIC |
Key Features
- Asynchronous Reset: The CD74HCT161MT features an asynchronous reset, allowing the counter to be reset regardless of the clock input level.
- Synchronous Counting and Loading: Counting and parallel presetting are accomplished synchronously with the negative-to-positive transition of the clock.
- Look-Ahead Carry: This feature simplifies serial cascading of the counters and enables high-speed counting.
- Two Count Enable Inputs: PE and TE inputs are provided for n-bit cascading, allowing multiple counters to be connected in series.
- Wide Operating Temperature Range: The device operates from -55°C to 125°C, making it suitable for a wide range of applications.
- High Noise Immunity: The HCT types have direct LSTTL input logic compatibility and high noise immunity.
- Significant Power Reduction: Compared to LSTTL logic ICs, the CD74HCT161MT offers significant power reduction.
Applications
- High-Speed Counting Systems: Ideal for applications requiring fast and accurate counting, such as in digital counters, timers, and frequency dividers.
- Digital Circuits: Used in various digital circuits where synchronous counting and loading are necessary.
- Industrial Control Systems: Suitable for industrial control systems that require reliable and high-speed counting operations.
- Automotive Electronics: Can be used in automotive electronics for applications such as speedometers and other counting systems.
Q & A
- What is the operating voltage range of the CD74HCT161MT?
The operating voltage range is from 4.5V to 5.5V.
- What is the maximum CP frequency for the CD74HCT161MT?
The maximum CP frequency is 30 MHz at VCC = 4.5V.
- What is the purpose of the look-ahead carry feature?
The look-ahead carry feature simplifies serial cascading of the counters and enables high-speed counting.
- How many count enable inputs does the CD74HCT161MT have?
The device has two count enable inputs, PE and TE.
- What is the temperature range for the CD74HCT161MT?
The device operates from -55°C to 125°C.
- What type of reset does the CD74HCT161MT have?
The CD74HCT161MT features an asynchronous reset.
- Can the CD74HCT161MT be used in high-speed counting applications?
Yes, it is designed for high-speed counting applications.
- What is the package type for the CD74HCT161MT?
The package type is 16 Ld SOIC.
- Is the CD74HCT161MT compatible with TTL input levels?
Yes, it is compatible with TTL input levels.
- What is the significance of the synchronous counting and loading feature?
Synchronous counting and loading are accomplished synchronously with the negative-to-positive transition of the clock, ensuring precise and synchronized operations.
