DS1994

` 4096 bits of Read/Write Nonvolatile Memory
` 256-bit Scratchpad Ensures Integrity of Data Transfer
` Memory Partitioned into 256-bit Pages for Packetizing Data
` Data Integrity Assured with Strict Read/Write Protocols
` Contains Real-Time Clock/Calendar in Binary Format
` Interval Timer Can Automatically Accumulate Time When Power is Applied
` Programmable Cycle Counter can Accumulate the Number of System Power-On/Off Cycles
` Programmable Alarms Can Be Set to Generate Interrupts for Interval Timer, Real-Time Clock, and/or Cycle Counter
` Write-Protect Feature Provides Tamperproof Time Data
` Programmable Expiration Date That Limits Access to SRAM and Timekeeping
` Clock Accuracy is Better Than ±2 Minutes/Month at 25
` Operating Temperature Range from -40 to +70
` Over 10 Years of Data Retention

Voltage on any Pin Relative to Ground ................................-0.5V to +7.0V
Operating Temperature .......................................................-40 to +70
Storage Temperature ..........................................................-40 to +70

* This is a stress rating only, and functional operation of the device at these or any other conditions above those indicated in the operation sections of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods of time may affect reliability.