DS3050W| Datasheet

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Rev 2; 10/06

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
o Single-Piece, Reflowable, 27mm x 27mm BGA Package Footprint o Internal Manganese Lithium Battery and Charger o Integrated Real-Time Clock o Unconditionally Write-Protects the Clock and SRAM when VCC is Out-of-Tolerance o Automatically Switches to Battery Supply when VCC Power Failures Occur o Reset Output can be Used as a CPU Supervisor o Interrupt Output can be Used as a CPU Watchdog Timer o Industrial Temperature Range (-40 C to +85 C) o 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

#Denotes a RoHS-compliant device that may include lead that is exempt under the RoHS requirements.

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.

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DS3050W DATASHEET