There are many types of timing IC chips, and the timing time is programmable
①EC340EGB SOP-8 package This one is timing OPTION for 8x difference. Timing can be selected from 10 seconds to 50 minutes. When the power is powered on, the output level is high. When the key starts timing, the LED1 output level is low. When the timing time is up, the LED1 output level is high.
EC340E-01B SOT23-6 package this timing IC is 15 seconds timing, using CMOS technology, low power consumption, strong anti-interference ability, simple peripheral circuit, push LED. The resistance can be used to adjust the LED brightening time. The timing time without resistance between OSCI and OSCO is 15 seconds.
③EC1062-242C SOP-8 package, this is a 24-hour cycle timing IC chip,