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Description。The CD40106BE consists of six Schmitt-trigger circuits. Each circuit functions as an inverter with Schmitt-trigger action on the input. The trigger switches at different points for positive- and negative-going signals. The difference between the positive-going voltage(VP)and the negative-going voltage(VN)is defined as hysteresis voltage(VH).。Features。Schmitt trigger action with no external components。Hysteresis voltage typ. at 0.9V at VDD = 5V， 2.3V at VDD = 10V， and 3.5V at VDD = 15V。Noise immunity greater than 50%。No limit on input rise and fall times。Standardised， symmetrical output characteristics。100% tested for quiescent current at 20sV。Maximum input current of 1μA at 18 V over full package temperature range； 100nA at 18V and 25℃。Low VDD to VSS current during slow input ramp

Description。This is a common 555 timer/oscillator from TI. A classic for all of those first year circuits projects where you need to blink an LED， generate tone， and thousands of other great beginning projects. Google around for a huge list of resourc

Description。Get with the times， already! This SparkFun Real Time Clock(RTC)Module is a Qwiic-enabled breakout board for the RV-1805 chipset. The RTC is ultra-low power(running at only about 22nA in its lowest power setting)so it can use a supercapacitor for backup power instead of a normal battery. This means you get plenty of charge and discharge cycles without any degradation to the "battery." To make it even easier to get your readings， all communication is enacted exclusively via I2C， utilizing our handy Qwiic system so no soldering is required to connect it to the rest of your system. However， we still have broken out 0.1"-spaced pins in case you prefer to use a breadboard.。This RTC module's built in RV-1805 has not one， but two internal oscillators：a 32.768kHz tuning fork crystal and a low power RC based oscillator and can automatically switch between the two using the more precise crystal to correct the RC oscillator every few minutes. This feature allows the module to maintain a very accurate date and time with the worst case being +/- about three minutes over a year. The RV-1805 also has a built in trickle charger so as soon as the RTC is connected to power the it will be fully charged in under 10 minutes and has the ability to switch power to other systems allowing it to directly turn on or off a power hungry device such as a microcontroller or RF engine.。There is also the option to add a battery to the board if the supercapacitor just isn't going keep your project powered long enough(keep in mind， the supercap can hypothetically make the board keep time for around 35 days)， you can solder on an external battery. That means you can let board sit with no power or connection to the outside world and the current hour/minute/second/date will be maintained.。Note：。The I2C address of the RV-1805 is 0x69 and is hardware defined. A multiplexer/Mux is required to communicate to multiple RV-1805 sensors on a single bus. If you need to use more than one RV-1805 sensor consider using the Qwiic Mux Breakout.。The SparkFun Qwiic connect system is an ecosystem of I2C sensors， actuators， shields and cables that make prototyping faster and less prone to error. All Qwiic-enabled boards use a common 1mm pitch， 4-pin JST connector. This reduces the amount of required PCB space， and polarized connections mean you can't hook it up wrong.。Get Started with the RV-1805 Real Time Clock Module Guide。Features。Operating Voltage(Startup)：1.6V - 3.6V。Operating Voltage(Timekeeping)：1.5V - 3.6V。Operating Temperature：-40℃ - 85℃。Time Accuracy：±2.0 ppm。Current Consumption：22nA(Typ.)。I2C Address：0xD2。Supercapacitor for Backup Power。2x Internal Oscillators。2x Qwiic Connectors