Overview
The LM555CMM/NOPB, produced by Texas Instruments, is a highly stable and versatile timer IC that can operate in both astable and monostable modes. It is a direct replacement for the SE555 and NE555, offering pin-to-pin compatibility and requiring no changes in schematics or layout. This device is widely used for generating accurate time delays or oscillations and is available in an 8-pin VSSOP package.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Supply Voltage | 4.5 | - | 16 | V |
| Supply Current (VCC = 5 V, RL = ∞) | 3 | 6 | - | mA |
| Supply Current (VCC = 15 V, RL = ∞) | 10 | 15 | - | mA |
| Output Voltage Drop (High, ISOURCE = 200 mA, VCC = 15 V) | - | 12.5 | - | V |
| Rise Time of Output | - | 100 | - | ns |
| Fall Time of Output | - | 100 | - | ns |
| Operating Junction Temperature | -70 | - | 70 | °C |
| Storage Temperature | -65 | - | 150 | °C |
Key Features
- Operates in both astable and monostable modes
- Timing from microseconds through hours
- Adjustable duty cycle
- Output can source or sink up to 200 mA and drive TTL circuits
- Temperature stability better than 0.005% per °C
- Normally on and normally off output configurations
- Available in 8-pin VSSOP package
Applications
- Precision timing
- Pulse generation
- Sequential timing
- Time delay generation
- Pulse width modulation
- Pulse position modulation
- Linear ramp generator
Q & A
- What are the operating voltage ranges for the LM555CMM/NOPB? The LM555CMM/NOPB operates within a supply voltage range of 4.5 V to 16 V.
- What are the typical supply currents for the LM555CMM/NOPB? The typical supply currents are 6 mA at VCC = 5 V and 15 mA at VCC = 15 V.
- Can the LM555CMM/NOPB drive TTL circuits? Yes, the LM555CMM/NOPB can source or sink up to 200 mA and drive TTL circuits.
- What are the temperature stability and operating junction temperature of the LM555CMM/NOPB? The temperature stability is better than 0.005% per °C, and the operating junction temperature range is from -70°C to 70°C.
- What are the package options for the LM555CMM/NOPB? The LM555CMM/NOPB is available in an 8-pin VSSOP package.
- Can the LM555CMM/NOPB be used in both astable and monostable modes? Yes, the LM555CMM/NOPB can operate in both astable and monostable modes.
- How is the timing interval controlled in the LM555CMM/NOPB? The timing interval is controlled by external resistors and capacitors. For monostable mode, it is controlled by one external resistor and one capacitor, while for astable mode, it is controlled by two external resistors and one capacitor.
- What is the minimum pulse width required for triggering in monostable mode? The minimum pulse width required for triggering is typically 10 μs.
- Can the LM555CMM/NOPB be reset during the timing cycle? Yes, the LM555CMM/NOPB can be reset during the timing cycle by applying a negative pulse to the reset terminal.
- What is the recommended power supply bypassing for the LM555CMM/NOPB? Adequate power supply bypassing is necessary to protect associated circuitry.
