Overview
The LMC555IMX/NOPB is a CMOS version of the industry-standard 555 series general-purpose timers, manufactured by Texas Instruments. This device is designed to offer low power dissipation and reduced supply current spikes, making it an efficient alternative to traditional 555 timers. The LMC555 is available in various packages, including SOIC, VSSOP, PDIP, and the industry's smallest 8-bump DSBGA package. It operates over a wide supply voltage range from 1.5V to 15V and is pin-for-pin compatible with the NE555/SE555/LM555 series, allowing for easy integration into existing designs.
Key Specifications
| Parameter | Minimum | Typical | Maximum | Unit |
|---|---|---|---|---|
| Operating Temperature Range | -40 | - | 125 | °C |
| Supply Voltage | 1.5 | - | 15 | V |
| Maximum Allowable Power Dissipation at 25°C | - | - | 740 (SOIC-8) | mW |
| Junction-to-Ambient Thermal Resistance | - | - | 138.9 (SOIC-8) | °C/W |
| Astable Frequency | - | 4.8 | 5.6 | kHz (at VS = 12 V) |
| Maximum Frequency | - | 3.0 | - | MHz (at VS = 5 V) |
| Output Rise and Fall Times | - | 15 | - | ns (at VS = 5 V, CL = 10 pF) |
| Trigger Propagation Delay | - | 100 | - | ns (at VS = 5 V) |
Key Features
- Fast astable frequency of up to 3 MHz
- Available in the industry's smallest 8-bump DSBGA package (1.43mm × 1.41mm)
- Less than 1 mW typical power dissipation at 5V supply
- 1.5V specified supply operating voltage
- Output fully compatible with TTL and CMOS logic at 5V supply
- Tested to −10mA, 50mA output current levels
- Reduced supply current spikes during output transitions
- Extremely low reset, trigger, and threshold currents
- Excellent temperature stability
- Pin-for-pin compatible with 555 series of timers
Applications
- Precision timing
- Pulse generation
- Sequential timing
- Time delay generation
- Pulse width modulation
- Pulse position modulation
- Linear ramp generators
Q & A
- What is the maximum operating frequency of the LMC555?
The LMC555 can operate at a maximum frequency of up to 3 MHz in astable mode.
- What are the available package options for the LMC555?
The LMC555 is available in SOIC, VSSOP, PDIP, and 8-bump DSBGA packages.
- How does the LMC555 compare to the traditional LM555 in terms of power consumption?
The LMC555 offers much lower power dissipation and reduced supply current spikes compared to the traditional LM555.
- What is the typical power dissipation of the LMC555 at a 5V supply voltage?
The typical power dissipation of the LMC555 is less than 1 mW at a 5V supply voltage.
- Is the LMC555 compatible with TTL and CMOS logic?
Yes, the output of the LMC555 is fully compatible with TTL and CMOS logic at a 5V supply.
- What are the key applications of the LMC555?
The LMC555 is used in precision timing, pulse generation, sequential timing, time delay generation, pulse width modulation, pulse position modulation, and linear ramp generators.
- How does the LMC555 operate in monostable mode?
In monostable mode, the LMC555 acts as a one-shot pulse generator. The pulse width is determined by the time constant of an RC network.
- What is the minimum operating supply voltage for the LMC555?
The minimum operating supply voltage for the LMC555 is 1.5V.
- How does the LMC555 handle thermal management?
The LMC555 has specified thermal metrics such as junction-to-ambient thermal resistance, which varies by package type.
- Is the LMC555 RoHS compliant?
Yes, the LMC555 is RoHS compliant and suitable for use in lead-free processes.
