Overview
The TLC555CPWRG4 is a monolithic timing circuit produced by Texas Instruments, utilizing the TI LinCMOS™ technology. This timer is fully compatible with CMOS, TTL, and MOS logic and operates at frequencies up to 2 MHz. The high input impedance of the TLC555 allows for the use of smaller timing capacitors compared to the NE555 or LM555, resulting in more accurate time delays and oscillations. It also features low power consumption across the full range of power-supply voltage.
Key Specifications
| Parameter | Conditions | Min | Typ | Max | Unit |
|---|---|---|---|---|---|
| Supply Voltage (VDD) | Operating Range | 2 | - | 15 | V |
| Trigger Voltage (VI(TRIG)) | 25°C, VDD = 5 V | 1.36 | 1.66 | 1.96 | V |
| Threshold Voltage (VIT) | 25°C, VDD = 5 V | 2.8 | 3.3 | 3.8 | V |
| Reset Voltage (VI(RESET)) | 25°C, VDD = 5 V | 0.4 | 1.1 | 1.5 | V |
| Supply Current (IDD) | 25°C, VDD = 5 V | 180 | 350 | 500 | µA |
| Low-Level Output Voltage (VOL) | IOL = 1 mA, 25°C, VDD = 5 V | 0.07 | 0.3 | 0.35 | V |
| Power Dissipation Capacitance (CPD) | 25°C, VDD = 5 V | - | 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.
- Full compatibility with CMOS, TTL, and MOS logic.
- Operates at frequencies up to 2 MHz.
- Trigger and threshold levels can be altered using the control voltage terminal (CONT).
- Active low reset input (RESET) to initiate a new timing cycle.
- High current timer output signal.
Applications
- Precision timing.
- Pulse generation.
- Sequential timing.
- Time delay generation.
- Pulse width modulation.
- Pulse position modulation.
- Linear ramp generator.
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 differ from the NE555 or LM555 in terms of timing capacitors?
The TLC555 allows for smaller timing capacitors due to its high input impedance, resulting in more accurate time delays and oscillations.
- What are the trigger and threshold voltage levels for the TLC555?
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 function of the reset input (RESET) on the TLC555?
The reset input (RESET) is an active low input that can override all other inputs and initiate a new timing cycle.
- What are some common applications of the TLC555?
Common applications include precision timing, pulse generation, sequential timing, time delay generation, pulse width modulation, pulse position modulation, and linear ramp generation.
- What is the low-level output voltage of the TLC555 at 1 mA current?
The low-level output voltage is typically 0.3 V at IOL = 1 mA and 25°C.
- How does the TLC555 handle unused inputs to prevent false triggering?
All unused inputs must be tied to an appropriate logic level to prevent false triggering.
- What is the power dissipation capacitance (CPD) of the TLC555 at 5 V?
The power dissipation capacitance (CPD) is typically 115 pF at 25°C and VDD = 5 V.
- What are the package options available for the TLC555?
The TLC555 is available in various packages including SOIC, PDIP, SOP, TSSOP, LCCC, and CDIP.
