So you can try adding a capacitor between this pin and ground if your circuit is not working. Note: I’ve heard from people not able to get their circuit working without this capacitor.
Sometimes you’ll see this pin connected with a capacitor (0.01 ♟/10 nF) to ground this is a way to keep any noise on it from influencing the frequency. This can be useful when you want to adjust the frequency of the circuit without changing the values of R1, R2, and C1. This pin is used to control the threshold voltage of the Threshold pin. This means the pin must be high normally so that the chip isn’t in a “reset” state. It’s an “inverted” pin, which means it resets when the pin goes low. Check your chip’s datasheet for the exact value. A 555 timer can give out only 100 to 200 mA in total. The output voltage from the chip is around 1.5 V lower than VCC when high and around 0 V when low. When this pin goes low (less than one-third of VCC), the output goes high. All unused inputs must be tied to an appropriate logic level to prevent false triggering.This pin connects to the negative side of the battery. Whenever the output is low, a low-impedance path is provided between the discharge terminal (DISCH) and GND. If RESET is low, the flip-flop is reset and the output is low. The reset input (RESET) can override all other inputs and can be used to initiate a new timing cycle. If TRIG is above the trigger level and the threshold input (THRES) is above the threshold level, the flip-flop is reset and the output is low. When the trigger input (TRIG) falls below the trigger level, the flip-flop is set and the output goes high. These levels can be altered by use of the control voltage terminal (CONT). Like the NE555, the TLC555 has a trigger level equal to approximately one-third of the supply voltage and a threshold level equal to approximately two-thirds of the supply voltage. Power consumption is low across the full range of power-supply voltage. As a result, more accurate time delays and oscillations are possible. Because of its high input impedance, this device supports smaller timing capacitors than those supported by the NE555 or LM555. The timer is fully compatible with CMOS, TTL, and MOS logic and operates at frequencies up to 2 MHz. The TLC555 is a monolithic timing circuit fabricated using the TI LinCMOS™ process. Configuration control and print support.High-reliability automotive applications.ESD protection exceeds 2000 V per MIL-STD-883C, method 3015.2.Functionally interchangeable with the NE555 has same pinout.Single-supply operation from 2 V to 15 V.Low supply current reduces spikes during output transitions.Output fully compatible with CMOS, TTL, and MOS.CMOS output capable of swinging rail to rail.
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