TLC555 - 2.1-MHz, 250-µA, Low-Power Timer

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.

• 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