GENERAL DESCRIPTION

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, as shown in Figure 8. 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.

FEATURES


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 or +5V 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 NV 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


Battery Voltage-Level Indicator Flags


Available as Chip (DS1501) or Stand-Alone Module with Embedded Battery and Crystal(DS1511)


UL Recognized

APPLICATIONS

Remote Systems

Battery-Backed Systems

Telecom Switches

Office Equipment

Consumer Electronics