Overview
The SN74HC4040PWT is a 12-stage asynchronous binary counter produced by Texas Instruments. This device is part of the HC4040 series, which includes various package options. Although the SN74HC4040PWT is listed as obsolete, it shares the same functional characteristics as other active versions in the series. The counter features all stages available externally, a clear input to reset the counter asynchronously, and a clock input to advance the count on a high-to-low transition.
Key Specifications
| Parameter | Min | Max | Unit | |
|---|---|---|---|---|
| Supply Voltage (VCC) | 2 | 5 | 6 | V |
| High-Level Input Voltage (VIH) | 1.5 (VCC=2V), 3.15 (VCC=4.5V), 4.2 (VCC=6V) | V | ||
| Low-Level Input Voltage (VIL) | 0.5 (VCC=2V), 1.35 (VCC=4.5V), 1.8 (VCC=6V) | V | ||
| Input Transition Rise/Fall Time (tt) | 1000 (VCC=2V), 500 (VCC=4.5V), 400 (VCC=6V) | ns | ||
| Operating Free-Air Temperature (TA) | -40 | 85 | °C | |
| Clock Frequency (fCLK) | 5.5 (VCC=2V), 28 (VCC=4.5V), 33 (VCC=6V) | MHz | ||
| Pulse Duration (tW) | 90 (VCC=2V), 18 (VCC=4.5V), 15 (VCC=6V) | ns | ||
| Setup Time, CLR Inactive Before CLK↓ (tsu) | 60 (VCC=2V), 12 (VCC=4.5V), 10 (VCC=6V) | ns | ||
| Propagation Delay (tpd) | 62 (VCC=2V), 16 (VCC=4.5V), 12 (VCC=6V) | ns | ||
| Input Capacitance (Ci) | 10 | pF | ||
| Supply Current (ICC) | 80 | μA |
Key Features
- Wide operating voltage range of 2 V to 6 V
- Outputs can drive up to 10 LSTTL loads
- Low power consumption, 80-µA max ICC
- Typical propagation delay (tpd) of 12 ns
- ±4-mA output drive at 5 V
- Low input current of 1 µA max
Applications
The SN74HC4040 is suitable for various applications including:
- Time-delay circuits
- Counter controls
- Frequency-dividing circuits
Q & A
- What is the SN74HC4040PWT?
The SN74HC4040PWT is a 12-stage asynchronous binary counter from Texas Instruments, although it is listed as obsolete.
- What is the operating voltage range of the SN74HC4040?
The operating voltage range is from 2 V to 6 V.
- How many LSTTL loads can the outputs drive?
The outputs can drive up to 10 LSTTL loads.
- What is the typical propagation delay of the SN74HC4040?
The typical propagation delay (tpd) is 12 ns.
- What is the maximum supply current (ICC) of the SN74HC4040?
The maximum supply current (ICC) is 80 µA.
- How does the counter advance?
The count is advanced on a high-to-low transition at the clock (CLK) input.
- What is the effect of a high level at the clear (CLR) input?
A high level at the clear (CLR) input asynchronously clears the counter and resets all outputs low.
- What are some common applications of the SN74HC4040?
Common applications include time-delay circuits, counter controls, and frequency-dividing circuits.
- What is the operating temperature range of the SN74HC4040?
The operating free-air temperature range is from -40°C to 85°C.
- What is the input capacitance (Ci) of the SN74HC4040?
The input capacitance (Ci) is typically 10 pF.
