●The TLC551 is a monolithic timing circuit 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.
●Like the NE555, the TLC551 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. These levels can be altered by use of the control voltage terminal (CONT). When the trigger input (TRIG) falls below the trigger level, the flip-flop is set and the output goes high. 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. The reset input (RESET) can override all other inputs and can be used to initiate a new timing cycle. If RESET is low, the flip-flop is reset and the output is low. Whenever the output is low, a low-impedance path is provided between DISCH and GND. All unused inputs should be tied to an appropriate logic level to prevent false triggering.
●While the CMOS output is capable of sinking over 100 mA and sourcing over 10 mA, the TLC551 exhibits greatly reduced supply-current spikes during output transitions. This minimizes the need for the large decoupling capacitors required by the NE555.
●The TLC551C is characterized for operation from 0°C to 7
● Very Low Power Consumption
●1 mW Typ at V
●DD
● = 5 V
● Capable of Operation in Astable Mode
● CMOS Output Capable of Swinging Rail
●to Rail
● High Output-Current Capability
●Sink 100 mA Typ
●Source 10 mA Typ
● Output Fully Compatible With CMOS, TTL, and MOS
● Low Supply Current Reduces Spikes During Output Transitions
● Single-Supply Operation From 1 V to 15 V
● Functionally Interchangeable With the NE555; Has Same Pinout
● ESD Protection Exceeds 2000 V Per MIL-STD-883C, Method 3015.2
