GENERAL PART DESCRIPTION
The CSS555C 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. The CSS555C device includes
an internal precision timing capacitor (CTI). Its value is trimmed to 100pF ±1%.

Key Features
· Lowest power 555 timer (by > 10X)!
Active mode current < 5 μA
· Wide operating range
Wide supply range: 1.2V to 5.5V
Temperature range: -40°C to +85°C
· Internal 6 decade, programmable counter
Settings = 1, 10, 102, 103, 104, 105 & 106
Multiplies delay time by up to 106
Delay times from microseconds to days
· Internal 100pF, ±1% Timing Capacitor
User adjustable, 0.2pF resolution
· 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

Applications
· 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