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2.1-MHz, 250-µA, Low-Power Timer


Package | PIN: PW | 14
Temp: C (0 to 70)
Carrier: Cut Tape
Qty Price
1-9 $0.70
10-24 $0.61
25-99 $0.56
100-249 $0.47
250-499 $0.43
500-749 $0.33
750-999 $0.25
1000+ $0.22


  • Very Low Power Consumption:
    • 1 mW Typical at VDD = 5 V
  • Capable of Operation in Astable Mode
  • CMOS Output Capable of Swinging Rail to Rail
  • High Output Current Capability
    • Sink: 100 mA Typical
    • Source: 10 mA Typical
  • 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
  • ESD Protection Exceeds 2000 V Per MIL-STD-883C, Method 3015.2
  • Available in Q-Temp Automotive
    • High-Reliability Automotive Applications
    • Configuration Control and Print Support
    • Qualification to Automotive Standards

Texas Instruments  TLC555CPWR

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) 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 the discharge terminal (DISCH) and GND. All unused inputs must be tied to an appropriate logic level to prevent false triggering.