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Rev 0; 4/05
3.3V Single-Piece 4Mb Nonvolatile SRAM with Clock
General Description
The DS3050W consists of a static RAM, a nonvolatile (NV) controller, a year 2000-compliant real-time clock (RTC), and an internal rechargeable manganese lithium (ML) battery. These components are encased in a surface-mount module with a 256-ball BGA footprint. Whenever VCC is applied to the module, it recharges the ML battery, powers the clock and SRAM from the external power source, and allows the contents of the clock registers or SRAM to be modified. When VCC is powered down or out-of-tolerance, the controller writeprotects the memory contents and powers the clock and SRAM from the battery. The DS3050W also contains a power-supply monitor output (RST), as well as a user-programmable interrupt output (IRQ/FT).
Features
♦ Single-Piece, Reflowable, 27mm x 27mm BGA Package Footprint ♦ Internal Manganese Lithium Battery and Charger ♦ Integrated Real-Time Clock ♦ Unconditionally Write-Protects the Clock and SRAM when VCC is Out-of-Tolerance ♦ Automatically Switches to Battery Supply when VCC Power Failures Occur ♦ Reset Output can be Used as a CPU Supervisor ♦ Interrupt Output can be Used as a CPU Watchdog Timer ♦ Industrial Temperature Range (-40°C to + 85°C) ♦ UL Recognized
DS3050W
Applications
RAID Systems and Servers POS Terminals Industrial Controllers Data-Acquisition Systems Gaming Fire Alarms PLCs Routers/Switches
Ordering Information
PART DS3050W-100 TEMP RANGE -40°C to +85°C PIN-PACKAGE 256-ball 27mm x 27mm BGA Module SPEED 100ns SUPPLY VOLTAGE (%) 3.3V ±0.3V
Typical Operating Circuit
CE WR RD CS CE WE OE CS
MICROPROCESSOR OR DSP DATA
DS3050W
8 BITS DQ0–7
512k x 8 NV SRAM AND RTC
ADDRESS
19 BITS
A0–18
INT INT
IRQ/FT RST
Pin Configuration appears at end of data sheet. ______________________________________________ Maxim Integrated Products 1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at 1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
3.3V Single-Piece 4Mb Nonvolatile SRAM with Clock DS3050W
ABSOLUTE MAXIMUM RATINGS
Voltage Range on Any Pin Relative to Ground......-0.3V to +4.6V Operating Temperature Range ...........................-40°C to +85°C Storage Temperature Range ...............................-40°C to +85°C Soldering Temperature Range .......See IPC/JEDEC J-STD-020C
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.
RECOMMENDED OPERATING CONDITIONS
(TA = -40°C to +85°C.)
PARAMETER Supply Voltage Input Logic 1 Input Logic 0 SYMBOL VCC VIH VIL CONDITIONS MIN 3.0 2.2 0.0 TYP 3.3 MAX 3.6 VCC 0.4 UNITS V V V
DC ELECTRICAL .