CSS555 Programmable 555 Timer


Micropower Programmable 555 Timer IC
The CSS555 is a micropower version of the popular 555 timer IC. It features an operating current under 5µA and a minimum supply voltage of 1.2V, making it ideal for battery-operated applications. A six-decade programmable counter is included to allow generation of long timing delays. Configuration data for the counter is held in EEPROM to maintain the standard pin count of eight. The analog circuits are temperature compensated to provide excellent stability over a wide ambient temperature range. A simple four-wire interface provides Read/Write access to the EEPROM.



  • Portable & Battery-Powered Systems
  • Precision Timing & Pulse Generation
  • Ultra Long Period Delay Generation
  • Single Cell Battery Applications
  • Ultra Low Power Timers
  • Pulse Width Modulation
  • Low Cost, High Reliability Applications
Key Features
  • Lowest power 555 timer by >10x – Active mode current <5µA
  • Wide operating range
  • 1.2V to 5.5V Supply Voltage
  • -40°C to +85°C Temperature Range
  • Internal 6 decade, programmable counter
  • Settings = 1, 10, 102, 103, 104, 105 and 106
    Multiplies delay time by up to 106
    Delay times from microseconds to days

  • Pin-for-pin compatible with 555 series timers
  • Monostable or Astable operation

  • Extremely low transient switching current
  • “Break-Before-Make” output driver

  • Temperature stability – 0.005% per °C



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Part Number



Micropower Programmable 555 Timer IC
Micropower Programmable 555 Timer IC