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DS1553, DS1553P
64kB, Nonvolatile, Year-2000-Compliant Timekeeping RAM
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Status
Description
The DS1553 is a full-function, year-2000-compliant (Y2KC) real-time clock/calendar (RTC) with an RTC alarm, watchdog timer, power-on reset, battery
monitor, and "8k x 8 nonvolatile static RAM (NV SRAM)." User access to all registers within the DS1553 is accomplished with a bytewide interface as shown in
Figure 1. The RTC registers contain century, year, month, date, day, hours, minutes, and seconds data in 24-hour BCD format. Corrections for day of month and
leap year are made automatically.
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Data Sheet
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This product contains lithium-metal batteries. See applicable regulations for transport requirements for batteries in equipment.
Key Features
- Integrated NV SRAM, RTC, Crystal, Power-Fail Control Circuit, and Lithium Energy Source
- Clock Registers are Accessed Identically to the Static RAM; These Registers are Resident in the 16 Top RAM Locations
- Totally Nonvolatile with Over 10 Years of Operation in the Absence of Power
- Precision Power-On Reset
- Programmable Watchdog Timer and RTC Alarm
- BCD-Coded Year, Month, Date, Day, Hours, Minutes, and Seconds with Automatic Leap Year Compensation Valid Up to the Year 2100
- Battery Voltage Level Indicator Flag
- Power-Fail Write Protection Allows for ±10% VCC Power-Supply Tolerance
- Lithium Energy Source is Electrically Disconnected to Retain Freshness Until Power is Applied for the First Time
- Underwriters Laboratories (UL) Recognized
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Key Specifications:
| Timekeeping & Real-Time Clocks |
| Part Number |
Functions |
Date/ Time Format |
Interface |
VSUPPLY
(V) |
Memory Type |
Memory Size
(Bytes) |
Time of Day Alarms |
Budgetary Price |
| hh = sec/100 |
See Notes |
| DS1553 |
Watchdog Timekeeper |
YYYY-MM-DD/ HH:MM:SS |
Bytewide |
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NV SRAM |
8K |
1 |
$10.01 @1k |
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See All Timekeeping & Real-Time Clocks (87)
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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 prices and delivery, please see the price and availability page or contact an authorized distributor.
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Diagram
Block Diagram
More Information
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Information Index
Document Ref.: 19-5480
Rev 3;
2010-09-04
This page last modified: 2010-09-06
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