Texas Instruments

Series: TLC555-Q1

Part Number: TLC555-Q1


Distributor SKU Stock Cost
Digi-Key 2156-TLC555QDRQ1-ND 0 $1.06 Buy
Texas Instruments TLC555QDRQ1 12500 $0.75 Buy
Mouser Electronics 595-TLC555QDRQ1 20135 $1.06 Buy
Arrow Asia TLC555QDRQ1 292500 $0.32 Buy
Verical Marketplace TLC555QDRQ1 102 $0.00 Buy
Utmel TLC555QDRQ1 23547 $0.99 Buy
Quest Components TLC555QDRQ1 96 $1.00 Buy
Arrow North American Components TLC555QDRQ1 0 $0.42 Buy
AVNET Europe TLC555QDRQ1 12500 * $0.45 Buy
AVNET Asia Pacific TLC555QDRQ1 12500 $0.35 Buy
Newark TLC555QDRQ1 294 $1.32 Buy
Farnell TLC555QDRQ1 2500 * $0.73 Buy
element14 APAC TLC555QDRQ1 2500 * $1.12 Buy
AVNET Express TLC555QDRQ1 59405 $0.75 Buy
Ameya360 TLC555QDRQ1 2500 $0.47 Buy

The TLC555-Q1 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-Q1 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-Q1 is characterized for operation over the full automotive temperature range of –40°C to 125°C.


Reference Designs

Evaluation Kits

Title Type Part number
EMC Compatible Automotive LED Rear Lamp With Sequential Turn Animation Evaluation Module Evaluation Modules & Boards TPS92638STAEVM