DS1500
Y2K-Compliant Watchdog RTC with NV Control
Part Details
- BCD-Coded Century, Year, Month, Date, Day, Hours, Minutes, and Seconds with Automatic Leap-Year Compensation Valid Up to the Year 2100
- Programmable Watchdog Timer and RTC Alarm
- Century Register; Y2K-Compliant RTC
- Automatic Battery Backup and Write Protection to External SRAM
- +5V or +3.3V Operation
- Precision Power-On Reset
- Power-Control Circuitry Supports System Power-On from Date/Day/Time Alarm or Key Closure
- 256 Bytes User NV RAM
- Auxiliary Battery Input
- Accuracy Better than ±1 Minute/Month at +25°C
- Day-of-Week/Date Alarm Register
- Battery Voltage-Level Indicator Flags
- Optional Industrial Temperature Range: -40°C to +85°C
The DS1500 is a full-function, year 2000-compliant, real-time clock/calendar (RTC) with an alarm, watchdog timer, power-on reset, battery monitors, 256 bytes of on-board nonvolatile (NV) SRAM, NV control for backing up an external SRAM, and a 32.768kHz output. User access to all registers within the DS1500 is accomplished with a byte-wide interface as shown in Figure 7. The RTC registers contain century, year, month, date, day, hours, minutes, and seconds data in 24-hour binary-coded decimal (BCD) format. Corrections for day of month and leap year are made automatically.
Applications
- Battery-Backed Systems
- Consumer Electronics
- Office Equipment
- Remote Systems
- Telecom Switches
Documentation
Data Sheet 1
Reliability Data 1
Design Note 5
Technical Articles 3
This is the most up-to-date revision of the Data Sheet.
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