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TLC555 LinCMOS™ Timers

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TLC555 LinCMOS™ Timers

Texas Instruments offers the 2.1 MHz, 250 µA, low-power timers for general-purpose timing applications

Image of Texas Instruments' TLC555 LinCMOS™ TimersTexas Instruments' 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.


  •  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


  • Precision timing

  • Pulse generation

  • Sequential timing

  • Time delay generation

  • Pulse width modulation

  • Pulse position modulation

  • Linear ramp generator

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