Overview
The 74HCT4538DB,118, produced by Nexperia USA Inc., is a dual retriggerable-resettable monostable multivibrator. This integrated circuit is part of the 74HCT series, which is compatible with TTL (Transistor-Transistor Logic) levels. The device is designed to generate precise output pulses based on external timing components.
Although the specific part number 74HCT4538DB,118 is listed as obsolete, the 74HCT4538 series remains relevant in various electronic applications. The multivibrator features two trigger/retrigger inputs, a direct reset input, and two complementary outputs, making it versatile for timing and pulse generation tasks.
Key Specifications
| Type number | VCC (V) | Logic switching levels | Output drive capability (mA) | tpd (ns) | Power dissipation considerations | Tamb (°C) | Rth(j-a) (K/W) | Ψth(j-top) (K/W) | Rth(j-c) (K/W) | Package name |
|---|---|---|---|---|---|---|---|---|---|---|
| 74HCT4538D | 4.5 - 5.5 | TTL | ± 4 | 30 | low | -40 to 125 | 74 | 1.7 | 32.8 | SO16 |
| 74HCT4538PW | 4.5 - 5.5 | TTL | ± 4 | 30 | low | -40 to 125 | 109 | 1 | 37 | TSSOP16 |
Key Features
- Dual Retriggerable-Resettable Monostable Multivibrator: Each multivibrator has two trigger/retrigger inputs, a direct reset input, and two complementary outputs.
- Precision Pulse Generation: The output pulse width is determined by external timing components CEXT and REXT, with the pulse width given by 0.7 × REXT × CEXT.
- Schmitt-Trigger Inputs: The trigger inputs feature Schmitt-trigger action, making the circuit highly tolerant to slower rise and fall times.
- Low Power Dissipation: The device has low power dissipation considerations.
- Wide Operating Temperature Range: The device operates over a temperature range of -40°C to 125°C.
Applications
- Timing and Pulse Generation: Ideal for applications requiring precise timing and pulse generation, such as in digital circuits, timing circuits, and signal processing.
- Automotive and Industrial Control Systems: Suitable for use in automotive and industrial control systems due to its robustness and wide operating temperature range.
- Consumer Electronics: Can be used in various consumer electronic devices that require reliable and precise timing functions.
Q & A
- What is the 74HCT4538DB,118?
The 74HCT4538DB,118 is a dual retriggerable-resettable monostable multivibrator IC, although this specific part number is now obsolete.
- What are the key features of the 74HCT4538 series?
The key features include dual retriggerable-resettable monostable multivibrator functionality, precision pulse generation, Schmitt-trigger inputs, and low power dissipation.
- What determines the output pulse width of the 74HCT4538?
The output pulse width is determined by the external timing components CEXT and REXT, given by 0.7 × REXT × CEXT.
- What is the operating temperature range of the 74HCT4538?
The device operates over a temperature range of -40°C to 125°C.
- What are the logic switching levels of the 74HCT4538?
The logic switching levels are compatible with TTL (Transistor-Transistor Logic) levels.
- What is the output drive capability of the 74HCT4538?
The output drive capability is ± 4 mA.
- What packages are available for the 74HCT4538?
The device is available in SO16 and TSSOP16 packages.
- Is the 74HCT4538DB,118 still in production?
No, the 74HCT4538DB,118 is listed as obsolete and no longer manufactured.
- What are some common applications of the 74HCT4538 series?
Common applications include timing and pulse generation in digital circuits, automotive and industrial control systems, and consumer electronics.
- How does the Schmitt-trigger action benefit the 74HCT4538?
The Schmitt-trigger action makes the circuit highly tolerant to slower rise and fall times, improving the reliability of the trigger inputs.
