Overview
The TLC555IDRDL, 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 designed for general-purpose timing applications and offers low power consumption across a wide range of supply voltages. The device features high input impedance, which allows for the use of smaller timing capacitors, resulting in more accurate time delays and oscillations.
Key Specifications
| Parameter | Test Conditions | Min | Max | Unit | |
|---|---|---|---|---|---|
| Supply Voltage | - | 2 | - | 15 | V |
| Threshold Voltage (VIT) | VDD = 5 V, 25°C | 2.8 | 3.3 | 3.8 | V |
| Trigger Voltage (VI(TRIG)) | VDD = 5 V, 25°C | 1.67 | 2.31 | 3 | V |
| Supply Current (IDD) | VDD = 5 V, 25°C | 180 | 350 | 600 | μA |
| Low-Level Output Voltage (VOL) | IOL = 1 mA, 25°C | 0.07 | - | 0.3 | V |
| Power Dissipation Capacitance (CPD) | 25°C | - | - | 115 | pF |
| Output Pulse Rise Time | RL = 10 MΩ, CL = 10 pF, 25°C | 20 | - | 75 | ns |
| Output Pulse Fall Time | RL = 10 MΩ, CL = 10 pF, 25°C | 20 | - | 75 | ns |
Key Features
- Low Power Consumption: Operates with low power consumption, typically 1 mW at VDD = 5 V.
- High Input Impedance: Allows for the use of smaller timing capacitors, resulting in more accurate time delays and oscillations.
- Compatibility: Fully compatible with CMOS, TTL, and MOS logic.
- Output Capabilities: Rail-to-rail CMOS output with high output current capability.
- Trigger and Threshold Levels: Trigger level is approximately one-third of the supply voltage, and threshold level is approximately two-thirds of the supply voltage. These levels can be altered using the control voltage terminal (CONT).
- Reset Functionality: The reset input (RESET) can override all other inputs to initiate a new timing cycle).
Applications
- Time Delay Generation: Suitable for generating precise time delays in various applications).
- Pulse Width Modulation (PWM): Can be used for PWM applications due to its ability to generate stable pulses).
- Pulse Position Modulation: Capable of pulse position modulation, making it versatile in communication systems).
- Linear Ramp Generator: Can be configured to act as a linear ramp generator).
- Automotive and Industrial Systems: The TLC555-Q1 variant is specifically designed for automotive and industrial applications, offering enhanced reliability and temperature range).
Q & A
- What is the operating frequency range of the TLC555?
The TLC555 operates at frequencies up to 2 MHz.
- What is the typical supply current of the TLC555 at 5 V?
The typical supply current is 350 μA at 25°C and VDD = 5 V).
- How does the TLC555 handle trigger and threshold levels?
The trigger level is approximately one-third of the supply voltage, and the threshold level is approximately two-thirds of the supply voltage. These levels can be altered using the control voltage terminal (CONT)).
- What is the significance of the high input impedance in the TLC555?
The high input impedance allows for the use of smaller timing capacitors, resulting in more accurate time delays and oscillations).
- Can the TLC555 be used in automotive applications?
- What are the typical output voltage levels for the TLC555?
The low-level output voltage (VOL) is typically 0.07 to 0.3 V at IOL = 1 mA, and the high-level output voltage (VOH) can swing rail-to-rail).
- How does the reset input function on the TLC555?
The reset input (RESET) can override all other inputs to initiate a new timing cycle).
- What is the power dissipation capacitance (CPD) of the TLC555?
The power dissipation capacitance (CPD) is typically 115 pF at 25°C).
- What are the typical rise and fall times of the output pulse?
The output pulse rise and fall times are typically 20 to 75 ns at RL = 10 MΩ and CL = 10 pF).
- What are the package options available for the TLC555?
The TLC555 is available in various packages including SOIC, PDIP, SOP, and TSSOP).
