DS2030W Datasheet, PDF (1/12 Pages) Maxim Integrated Products – 3.3V Single-Piece 256k Nonvolatile SRAM

Rev 0; 10/04
DS2030W 3.3V Single-Piece 256k
Nonvolatile SRAM
General Description
The DS2030W is a 256kb reflowable nonvolatile (NV)
SRAM, which consists of a static RAM (SRAM), an NV
controller, and an internal rechargeable manganese
lithium (ML) battery. These components are encased in
a surface-mount module with a 256-ball BGA footprint.
Whenever V_CC is applied to the module, it recharges the
ML battery, powers the SRAM from the external power
source, and allows the contents of the SRAM to be mod-
ified. When V_CC is powered down or out of tolerance,
the controller write-protects the SRAM’s contents and
powers the SRAM from the battery. The DS2030W also
contains a power-supply monitor output, RST, which can
be used as a CPU supervisor for a microprocessor.
RAID Systems and Servers
Industrial Controllers
Gaming
Router/Switches
Applications
POS Terminals
Data-Acquisition Systems
Fire Alarms
PLC
Features
♦ Single-Piece, Reflowable, 27mm² PBGA Package
Footprint
♦ Internal ML Battery and Charger
♦ Unconditionally Write-Protects SRAM when V_CC
is Out-of-Tolerance
♦ Automatically Switches to Battery Supply when
V_CC Power Failures Occur
♦ Internal Power-Supply Monitor Detects Power Fail
Below Nominal V_CC (3.3V)
♦ Reset Output can be used as a CPU Supervisor
for a Microprocessor
♦ Industrial Temperature Range (-40°C to +85°C)
♦ UL Recognized
Pin Configuration appears at end of data sheet.
PART
DS2030W-100
TEMP RANGE
-40°C to +85°C
PIN-PACKAGE
256 Ball 27mm² BGA Module
Ordering Information
SPEED (ns)
100
SUPPLY TOLERANCE (%)
3.3V ±0.3V
Typical Operating Circuit
(WR)
P3.6
(RD)
P3.7
PSEN
8051
MICROPROCESSOR
P0.0–7
ALE
8 BITS
P2.0–6
(INT3)
P1.5
FROM EXTERNAL DECODE LOGIC
CE
WE
AND
SN74AC573
LATCH
D0–7
Q0–7
LE
8 BITS
OE
DQ0–7 DS2030W
32k x 8
NV SRAM
A0–7
7 BITS
A8–14
RST
______________________________________________ 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.