Active production — dual 555 timer in a 14-pin DIP
The TLC556IN is an active-production dual 555-type timer/oscillator from Texas Instruments' LinCMOS series, packing two independent 555 timer stages in a single 14-pin DIP package.
The 720 µA supply current (at 5V, no load) is the whole-device quiescent draw — both timers running, outputs open. For battery-powered or low-power designs, this is the number to budget; each timer's output will add load current proportional to the pull-up resistor and duty cycle. The 2.1 MHz maximum frequency is the upper limit for astable operation — real-world oscillator design should leave margin for component tolerances and temperature drift. For precision timing, the CMOS input structure also means the trigger and threshold pins present a 1 pF load, so RC time constants stay close to the calculated value. The through-hole 14-DIP (0.300" width) is breadboard-friendly and survives rework well.
Where a dual 555 timer fits
Two 555 timers in one package means you can generate a delayed pulse and a gating window from the same chip — for example, a missing-pulse detector that triggers an alarm if a conveyor encoder stops, with the second timer setting the watchdog period. The LinCMOS process keeps the supply current low enough that the TLC556IN can run directly from a 9V battery in portable test gear or field instruments, where a bipolar 556 would drain the cell in hours.