Standard Timer Single 8-Pin SOIC T/R

The TLC555 is a monolithic timing circuit fabricated using the TI LinCMOS process. The timer is fully compatible with CMOS, TTL, and MOS logic and operates at frequencies up to 2 MHz. Because of its high input impedance, this device uses smaller timing capacitors than those used by the NE555. 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 TLC555 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) falling below the trigger level sets the flip-flop, and the output goes high. Having TRIG above the trigger level and the threshold input (THRES) above the threshold level resets the flip-flop, and the output is low. The reset input (RESET) can override all other inputs, and a possible use is to initiate a new timing cycle. RESET going low resets the flip-flop, and the output is low. Whenever the output is low, a low-impedance path exists between the discharge terminal (DISCH) and GND. Tie all unused inputs to an appropriate logic level to prevent false triggering.The advantage of the TLC555-Q1 is that it exhibits greatly reduced supply-current spikes during output transitions. Although the CMOS output is capable of sinking over 100 mA and sourcing over 10 mA, the main reason the TLC555-Q1 is able to have low current spikes is due to its edge rates. This minimizes the need for the large decoupling capacitors required by the NE555.The TLC555 is characterized for operation over the full automotive temperature range of –40°C to 125°C.

Qualified for Automotive Applications

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 2 V to 15 V

Functionally Interchangeable With the NE555; Has Same Pinout