The TLC551 is a monolithic timing circuit RESET can override TRIG, which can override THRES. fabricated using the TI LinCMOSTM process. The timer is fully compatible with CMOS, TTL, and MOS logic and operates at frequencies up to 2 MHz. Compared to the NE555 timer, this device uses smaller timing capacitors because of its high input impedance. As a result, more accurate time delays and oscillations are possible. Power consumption is low across the full range of power supply voltage.