DS1501

Y2K-Compliant Watchdog Real-Time Clocks


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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.
DS1501, DS1511: Typical Operating Circuit DS1501, DS1511: Typical Operating Circuit Enlarge+

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

See parametric specs for Timekeeping & Real-Time Clocks (78)


Part NumberInterfaceVSUPPLY
(V)
CL
(pF)
Memory TypeMemory Size
(Bytes)
Time of Day AlarmsFunctionsPackage/PinsBudgetary
Price
See Notes
DS1501 Bytewide
3.3
5
6
12.5
NV SRAM2561
RTC
Watchdog Timekeeper
PDIP/28
SOIC/28
SOIC (W)/28
TSOP/28
$4.86 @1k
DS1511 -
MOD/28
$10.90 @1k

Pricing Notes:
This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific and version-specific prices and delivery, please see the price and availability page or contact an authorized distributor.
Product Reliability Reports: DS1501.pdf 
Device   Fab Process   Technology   Sample size   Rejects   FIT at 25°C   FIT at 55°C   Material Composition  

Note : The failure rates are summarized by technology and mapped to the associated material part numbers. The failure rates are highly dependent on the number of units tested.

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Related Resources


MAX31343
±5ppm, I2C Real-Time Clock with Integrated MEMS Oscillator

  • Highly Accurate RTC with Integrated MEMS Resonator Completely Manages All Timekeeping Functions
  • 64-Byte RAM for User Data Storage
  • Simple Serial Interface Connects to Most Microcontrollers