DS1254 查看數據表（PDF） - Maxim Integrated
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DS1254 Datasheet PDF : 17 Pages
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19-4621; 12/09
DS1254
2M x 8 NV SRAM with Phantom Clock
www.maxim-ic.com
GENERAL DESCRIPTION
The DS1254 is a fully nonvolatile static RAM (NV SRAM)
(organized as 2M words by 8 bits) with built-in real-time
clock. It has a self-contained lithium energy source and
control circuitry that constantly monitors VCC for an out-of-
tolerance condition. When such a condition occurs, the
DS1254 makes use of an attached DS3800 battery cap to
maintain clock information and preserve stored data while
protecting that data by disallowing all memory accesses.
Additionally, the DS1254 has dedicated circuitry for
monitoring the status of an attached DS3800 battery cap.
FEATURES
Real-Time Clock (RTC) Keeps Track of Hundredths of
Seconds, Seconds, Minutes, Hours, Days, Date,
Months, and Years with Automatic Leap-Year
Compensation Valid Up to the Year 2100
2M x 8 NV SRAM
Watch Function is Transparent to RAM Operation
Automatic Data Protection During Power Loss
Unlimited Write-Cycle Endurance
Surface-Mountable BGA Module Construction
Over 10 Years of Data Retention in the Absence of
Power
Battery Monitor Checks Remaining Capacity Daily
+3.3V Operation
Underwriters Laboratory (UL) Recognized
(www.maxim-ic.com/qa/info/ul/)
PACKAGE OUTLINE
Side -A- Shown
(For Reference Only, Not to Scale)
Component placement may vary.
TYPICAL OPERATING CIRCUIT
+3.3V
APPLICATIONS
Telecom Switches
Routers
RAID Systems
ORDERING INFORMATION
PART
TEMP RANGE
DS1254WB-150
DS1254WB2-150
0°C to +70°C
0°C to +70°C
PIN-PACKAGE
40mm BGA
40mm BGA
VOLTAGE RANGE
(V)
3.3
3.3
TOP MARK
DS1254W-150
DS1254W-150
Note: Some revisions of this device may incorporate deviations from published specifications known as errata. Multiple revisions of any device
may be simultaneously available through various sales channels. For information about device errata, click here: www.maxim-ic.com/errata.
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