TLC555ID

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 supports smaller timing capacitors than those supported by the NE555 or LM555. 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.

Key Features

• Very low power consumption:
  • 1-mW typical 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 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