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