Overview
The CD74HCT4020M96 is a High Speed CMOS Logic 14-stage binary counter produced by Texas Instruments. This device is part of the HCT series, which is designed for compatibility with TTL (Transistor-Transistor Logic) inputs while operating within the CMOS (Complementary Metal-Oxide-Semiconductor) voltage range. The counter advances one count on the negative edge of each input pulse and can be reset to its zero state by a high voltage level on the CLR (Clear) line. All inputs and outputs are buffered, ensuring reliable operation across a wide range of conditions.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| VCC Supply Voltage | 4.5 | 5.5 | V | |
| Operating Temperature Range | -55 | 125 | ℃ | |
| Maximum Input Pulse Frequency | 20 | 25 | MHz | |
| Input Pulse Width | 20 | 30 | ns | |
| Propagation Delay Time (CP to Q1') | 40 | 50 | 60 | ns |
| Output Transition Time | 15 | 19 | 22 | ns |
| Input Capacitance | 10 | 10 | pF | |
| Power Dissipation Capacitance | 30 | 30 | pF | |
| Junction-to-Ambient Thermal Resistance | 73 | °C/W |
Key Features
- Fully static operation
- Buffered inputs
- Common reset (CLR) line to reset all counters to zero state
- Negative edge clocking
- Wide operating temperature range: -55℃ to 125℃
- Balanced propagation delay and transition times
- Significant power reduction compared to LSTTL Logic ICs
- Direct LSTTL input logic compatibility
- CMOS input compatibility with low input current (II ≤ 1 µA at VOL, VOH)
- High noise immunity: NIL = 30%, NIH = 30% of VCC at VCC = 5 V
Applications
The CD74HCT4020M96 is suitable for a variety of digital circuit applications, including:
- Counting circuits in digital systems
- Timing and sequencing circuits
- Frequency dividers
- Event counters in industrial control systems
- Automotive and aerospace applications requiring high reliability and wide temperature range operation
Q & A
- What is the CD74HCT4020M96?
The CD74HCT4020M96 is a High Speed CMOS Logic 14-stage binary counter produced by Texas Instruments.
- What is the operating voltage range of the CD74HCT4020M96?
The operating voltage range is 4.5 V to 5.5 V.
- What is the maximum input pulse frequency for the CD74HCT4020M96?
The maximum input pulse frequency is 25 MHz.
- How does the counter advance?
The counter advances one count on the negative edge of each input pulse.
- How can the counter be reset?
The counter can be reset to its zero state by a high voltage level on the CLR (Clear) line.
- What is the operating temperature range of the CD74HCT4020M96?
The operating temperature range is -55℃ to 125℃.
- What type of input compatibility does the CD74HCT4020M96 have?
The device has direct LSTTL input logic compatibility and CMOS input compatibility.
- What is the propagation delay time from CP to Q1'?
The propagation delay time from CP to Q1' is between 40 ns and 60 ns.
- What is the output transition time?
The output transition time is between 15 ns and 22 ns.
- What is the recommended bypass capacitor for the power supply?
A 0.1-μF capacitor is recommended, and it is acceptable to parallel multiple bypass caps to reject different frequencies of noise.
- What are some common applications of the CD74HCT4020M96?
Common applications include counting circuits, timing and sequencing circuits, frequency dividers, and event counters in industrial control systems.
