DS3050W Datasheet, PDF (1/18 Pages) Maxim Integrated Products – 3.3V Single-Piece 4Mb Nonvolatile SRAM with Clock

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 sur-
face-mount module with a 256-ball BGA footprint.
Whenever V_CC 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 V_CC is
powered down or out-of-tolerance, the controller write-
protects the memory contents and powers the clock
and SRAM from the battery. The DS3050W also con-
tains a power-supply monitor output (RST), as well as a
user-programmable interrupt output (IRQ/FT).
Applications
RAID Systems and Servers
POS Terminals
Industrial Controllers
Data-Acquisition Systems
Gaming
Fire Alarms
PLCs
Routers/Switches
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 V_CC is Out-of-Tolerance
♦ Automatically Switches to Battery Supply when
V_CC 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
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
MICROPROCESSOR
OR DSP _DATA
ADDRESS
INT
INT
8 BITS
19 BITS
CE
WE
OE
CS
DS3050W
512k x 8
DQ0–7 _{NV SRAM}
AND RTC
A0–18
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.