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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.
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/)
APPLICATIONS
Telecom Switches
Routers
RAID Systems
PACKAGE OUTLINE
TYPICAL OPERATING CIRCUIT
ORDERING INFORMATION
PART
TEMP RANGE
PIN-PACKAGE
VOLTAGE RANGE
(V)
TOP MARK
DS1254WB-150
0°C to +70°C
40mm BGA
3.3
DS1254W-150
DS1254WB2-150
0°C to +70°C
40mm BGA
3.3
DS1254W-150
DS1254
2M x 8 NV SRAM with Phantom Clock
www.maxim-ic.com
Side -A- Shown
(For Reference Only, Not to Scale)
Component placement may vary.
19-4621; 12/09
+3.3V
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相关代理商/技术参数
DS1254WB2-150 功能描述:实时时钟 2M X 8 NV SRAM w/Phantom Clock RoHS:否 制造商:Microchip Technology 功能:Clock, Calendar. Alarm RTC 总线接口:I2C 日期格式:DW:DM:M:Y 时间格式:HH:MM:SS RTC 存储容量:64 B 电源电压-最大:5.5 V 电源电压-最小:1.8 V 最大工作温度:+ 85 C 最小工作温度: 安装风格:Through Hole 封装 / 箱体:PDIP-8 封装:Tube
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