Overview
The TLC555MFKB, produced by Texas Instruments, is a monolithic timing circuit fabricated using the TI LinCMOS™ technology. This timer is fully compatible with CMOS, TTL, and MOS logic and operates at frequencies up to 2 MHz. It is characterized for operation over the full military temperature range of -55°C to 125°C, making it suitable for a wide range of applications, including those in harsh environments.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Supply Voltage (VDD) | -0.3 | - | 18 | V |
| Operating Temperature | -55 | - | 125 | °C |
| Trigger Voltage (VI(TRIG)) at VDD = 5 V | 1.36 | 1.66 | 1.96 | V |
| Threshold Voltage (VIT) at VDD = 5 V | 2.8 | 3.3 | 3.8 | V |
| Low-level Output Voltage (VOL) at IOL = 1 mA | 0.07 | - | 0.3 | V |
| Supply Current (IDD) at VDD = 5 V, 25°C | 180 | 350 | 500 | µA |
| Power Dissipation Capacitance (CPD) | - | - | 115 | pF |
Key Features
- High input impedance, allowing for smaller timing capacitors and more accurate time delays and oscillations.
- Low power consumption across the full range of power-supply voltage.
- Trigger and threshold levels adjustable via the control voltage terminal (CONT).
- Reset input (RESET) to override all other inputs and initiate a new timing cycle.
- Compatible with CMOS, TTL, and MOS logic.
- Operates at frequencies up to 2 MHz.
Applications
- Time delay generation.
- Pulse width modulation.
- Pulse position modulation.
- Linear ramp generator.
- Monostable and astable multivibrator configurations.
- Industrial and military applications due to its wide temperature range.
Q & A
- What is the operating temperature range of the TLC555MFKB? The TLC555MFKB operates over the full military temperature range of -55°C to 125°C.
- What is the maximum frequency at which the TLC555MFKB can operate? The TLC555MFKB can operate at frequencies up to 2 MHz.
- How does the TLC555MFKB differ from the NE555 or LM555? The TLC555MFKB has a higher input impedance, allowing for smaller timing capacitors and more accurate time delays and oscillations.
- What are the trigger and threshold voltage levels for the TLC555MFKB? The trigger level is approximately one-third of the supply voltage, and the threshold level is approximately two-thirds of the supply voltage.
- Can the trigger and threshold levels be adjusted? Yes, the trigger and threshold levels can be adjusted via the control voltage terminal (CONT).
- What is the purpose of the reset input (RESET) on the TLC555MFKB? The reset input (RESET) can override all other inputs and initiate a new timing cycle.
- Is the TLC555MFKB compatible with other logic types? Yes, it is fully compatible with CMOS, TTL, and MOS logic.
- What are some common applications of the TLC555MFKB? Common applications include time delay generation, pulse width modulation, pulse position modulation, and linear ramp generation.
- How does the power consumption of the TLC555MFKB vary with supply voltage? The TLC555MFKB has low power consumption across the full range of power-supply voltage.
- What is the significance of the high input impedance of the TLC555MFKB? The high input impedance allows for the use of smaller timing capacitors, resulting in more accurate time delays and oscillations.
