Overview
The LM555CN/NOPB, produced by Texas Instruments, is a highly stable device designed for generating accurate time delays or oscillation. It is a versatile timer that can operate in both astable and monostable modes. The LM555 is a direct replacement for the SE555 and NE555, offering pin-to-pin compatibility and eliminating the need for schematic or layout changes. It is widely used in various applications requiring precise timing and pulse generation.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Supply Voltage | 4.5 | 16 | V | |
| Supply Current (VCC = 5 V, RL = ∞) | 3 | 6 | 10 | mA |
| Supply Current (VCC = 15 V, RL = ∞) | 15 | mA | ||
| Output Current | 200 | mA | ||
| Operating Temperature Range | 0 | 70 | °C | |
| Storage Temperature Range | -65 | 150 | °C | |
| Power Dissipation (PDIP Package) | 1180 | mW | ||
| Junction-to-Ambient Thermal Resistance (PDIP) | 106 | °C/W |
Key Features
- Direct Replacement for SE555/NE555: Pin-to-pin compatible, eliminating the need for schematic or layout changes.
- Timing from Microseconds through Hours: Precise control over time delays using external resistors and capacitors.
- Operates in Both Astable and Monostable Modes: Flexible operation as a one-shot pulse generator or a continuous oscillator.
- Adjustable Duty Cycle: Allows for customization of the output pulse width and frequency.
- Output Can Source or Sink 200 mA: Capable of driving TTL circuits and handling significant current loads.
- Output and Supply TTL Compatible: Ensures compatibility with TTL logic circuits.
- Temperature Stability Better than 0.005% per °C: High stability across a range of temperatures.
- Normally On and Normally Off Output: Versatile output configurations.
- Available in 8-pin PDIP, SOIC, and VSSOP Packages: Multiple packaging options for different design needs.
Applications
- Precision Timing: Used in applications requiring accurate time delays and frequency generation.
- Pulse Generation: Generates pulses for various timing and control applications.
- Sequential Timing: Used in sequential logic circuits and timing sequences.
- Time Delay Generation: Provides precise time delays in electronic circuits.
- Pulse Width Modulation (PWM): Used in applications requiring variable pulse widths.
- Pulse Position Modulation (PPM): Used for modulating the position of pulses.
- Linear Ramp Generators: Generates linear ramps for various applications.
Q & A
- What are the primary modes of operation for the LM555CN/NOPB?
The LM555CN/NOPB operates in both astable (free-running oscillator) and monostable (one-shot pulse generator) modes.
- What is the supply voltage range for the LM555CN/NOPB?
The supply voltage range is from 4.5 V to 16 V.
- How much current can the output of the LM555CN/NOPB source or sink?
The output can source or sink up to 200 mA.
- Is the LM555CN/NOPB compatible with TTL logic circuits?
- What are the available package types for the LM555CN/NOPB?
The LM555CN/NOPB is available in 8-pin PDIP, SOIC, and VSSOP packages.
- How stable is the LM555CN/NOPB in terms of temperature?
The LM555CN/NOPB has a temperature stability better than 0.005% per °C.
- Can the LM555CN/NOPB be used as a direct replacement for other timers?
- What is the operating temperature range for the LM555CN/NOPB?
The operating temperature range is from 0°C to 70°C.
- How is the time delay controlled in the LM555CN/NOPB?
The time delay is precisely controlled by one external resistor and capacitor in monostable mode, and by two external resistors and one capacitor in astable mode.
- What are some common applications of the LM555CN/NOPB?
