DS1557
FEATURES
- Integrated NV SRAM, Real-Time Clock (RTC), Crystal, Power-Fail Control Circuit, and Lithium Energy Source
- Clock Registers are Accessed Identically to the Static RAM; These Registers Reside in the 16 Top RAM Locations
- Century Byte Register (i.e., Y2K pliant)
- Totally Nonvolatile with Over 10 Years of
Operation in the Absence of Power
- Precision Power-On Reset
- Programmable Watchdog Timer and RTC
Alarm
- BCD-Coded Year, Month, Date, Day, Hours,
Minutes, and Seconds with Automatic Leap Year pensation Valid Up to the Year 2100
- Battery Voltage-Level Indicator Flag
- Power-Fail Write Protection Allows for 10% VCC Power-Supply Tolerance
- Lithium Energy Source is Electrically Disconnected to Retain Freshness Until Power is Applied for the First Time
- Also Available in Industrial Temperature Range: -40°C to +85°C
PIN CONFIGURATION
TOP VIEW
IRQ/FT 1
A18
A15 2
Maxim
A17
A16 3
RST 4
VCC WE
5 6
A14
31 30
A13 A12
A11
OE CE DQ7 DQ6 DQ5...
