Real Time Clock Parallel 256Byte 28-Pin PDIP

The DS1501/DS1511 are full-function, year 2000-compliant real-time clock/calendars (RTCs) with an RTC alarm, watchdog timer, power-on reset, battery monitors, 256 bytes NV SRAM, and a 32.768kHz output. User access to all registers within the DS1501/DS1511 is accomplished with a byte-wide interface. 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.

• 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
• +3.3 (W) or +5V (Y) Operation
• Precision Power-On Reset
• Power-Control Circuitry Support System Power-On from Date/Day/Time Alarm or Key Closure/Modem-Detect Signal
• 256 Bytes Battery-Backed SRAM
• Auxiliary Battery Input
• Accuracy of DS1511 Better than ±1 Minute/Month at +25°C
• Day-of-Week/Date Alarm Register
• Crystal Select Bit Allow RTC to Operate with 6pF or 12.6pF Crystal (DS1501)
• Battery Voltage-Level Indicator Flags
• Available as Chip (DS1501) or Stand-Alone Encapsulated DIP Module with Embedded Battery and Crystal (DS1511)