DS1557 Overview
A0 A18 - Address Input DQ0 DQ7 IRQ/FT - Data Input/Outputs - Interrupt, Frequency Test Output (Open Drain) RST - Power-On Reset Output (Open Drain) CE - Chip Enable OE - Output Enable WE - Write Enable VCC GND - Power-Supply Input - Ground X1, X2 - Crystal Connection VBAT - Battery Connection Note: Some revisions of this device may incorporate deviations from published specifications known as errata. Multiple...
DS1557 Key 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)
- Precision Power-On Reset
- Programmable Watchdog Timer and RTC
- BCD-Coded Year, Month, Date, Day, Hours
- 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