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Y2K-Compliant Watchdog Real-Time Clocks

Product Details

Key Features

Parametric specs for Timekeeping & Real-Time Clocks
Interface Bytewide parallel
VSUPPLY (V) 3 to 5.5
Date/ Time Format (hh = sec/100) YYYY-MM-DD/ HH:MM:SS
Time Keeping Current (nA) (typ) 270
Memory Type NV SRAM
Memory Size (Bytes) 256
Time of Day Alarms 1
Package/Pins MOD/28
Budgetary
Price (See Notes)
11.55
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Simplified Block Diagram

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Parameters

Parametric specs for Timekeeping & Real-Time Clocks
Interface Bytewide parallel
VSUPPLY (V) 3 to 5.5
Date/ Time Format (hh = sec/100) YYYY-MM-DD/ HH:MM:SS
Time Keeping Current (nA) (typ) 270
Memory Type NV SRAM
Memory Size (Bytes) 256
Time of Day Alarms 1
Package/Pins MOD/28
Budgetary
Price (See Notes)
11.55

Key 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 (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)

Applications/Uses

  • Battery-Backed Systems
  • Consumer Electronics
  • Office Equipment
  • Remote Systems
  • Telecom Switches

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.

Simplified Block Diagram

DS1501, DS1511: Typical Operating Circuit DS1501, DS1511: Typical Operating Circuit Zoom icon

Support & Training

Search our knowledge base for answers to your technical questions.

Filtered Search

Our dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal .