DS1558 Description
The DS1558 uses the address inputs to determine whether or not a read or write cycle should be directed to the attached SRAM or to the RTC registers. Data input/output pins for the RTC registers. Ground Active-Low Chip-Enable RAM.
DS1558 Key Features
- Integrated Real-Time Clock (RTC), PowerFail Control Circuit, and NV RAM Controller
- Clock Registers are Accessed Identically to the Static RAM; These Registers are Resident in the 16 Top RAM Locations
- Century Register
- Greater than 10 Years of Timekeeping and
- Precision Power-On Reset
- Programmable Watchdog Timer and RTC Alarm
- BCD-Coded Year, Month, Date, Day, Hours, Minutes, and Seconds with Automatic LeapYear pensation Valid Up to the Year 210
- Battery Voltage-Level Indicator Flag
- Power-Fail Write Protection Allows for 10% VCC Power-Supply Tolerance
- Underwriters Laboratory (UL) Recognized