ds2065w Maxim Integrated Products, Inc., ds2065w Datasheet - Page 9

• Manufacturer Part Number: ds2065w
• Description: 3.3v Single-piece 8mb Nonvolatile Sram Integrated Products
• Manufacturer: Maxim Integrated Products, Inc.

The DS2065W is a 8Mb (1024kb x 8 bits) fully static, NV
memory similar in function and organization to the
DS1265W NV SRAM, but containing a rechargeable ML
battery. The DS2065W NV SRAM constantly monitors
V
dition occurs, the lithium energy source is automatically
switched on and write protection is unconditionally
enabled to prevent data corruption. There is no limit to
the number of write cycles that can be executed and no
additional support circuitry is required for microprocessor
interfacing. This device can be used in place of SRAM,
EEPROM, or flash components.
A0–A19
CC
GND
V
WE
CE
OE
CC
for an out-of-tolerance condition. When such a con-
ML
V
SW
V
TP
CURRENT-LIMITING
REF
REF
Detailed Description
RESISTOR
BATTERY-CHARGING/SHORTING
PROTECTION CIRCUITRY (UL RECOGNIZED)
CURRENT-LIMITING
RESISTOR
REDUNDANT LOGIC
DS2065W 3.3V Single-Piece 8Mb
_____________________________________________________________________
DELAY TIMING
CIRCUITRY
REDUNDANT
SERIES FET
CHARGER
The DS2065W assembly consists of a low-power SRAM,
an ML battery, and an NV controller with a battery charg-
er, integrated on a standard 256-ball, 27mm
strate. Unlike other surface-mount NV memory modules
that require the battery to be removable for soldering,
the internal ML battery can tolerate exposure to con-
vection reflow soldering temperatures allowing this sin-
gle-piece component to be handled with standard BGA
assembly techniques.
The DS2065W also contains a power-supply monitor
output, RST, which can be used as a CPU supervisor
for a microprocessor.
Nonvolatile SRAM
V
WE
CE
OE
CC
UNINTERRUPTED
POWER SUPPLY
Functional Diagram
FOR THE SRAM
DS2065W
SRAM
2
BGA sub-
RST
DQ0–7
9