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PDF DS3065W Data sheet ( Hoja de datos )

Número de pieza DS3065W
Descripción Single-Piece 8Mb Nonvolatile SRAM
Fabricantes Maxim Integrated Products 
Logotipo Maxim Integrated Products Logotipo



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Rev 0; 4/05
3.3V Single-Piece 8Mb Nonvolatile SRAM
with Clock
General Description
The DS3065W 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 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 write-
protects the memory contents and powers the clock
and SRAM from the battery. The DS3065W 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 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
Ordering Information
PART
DS3065W-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
20 BITS
CE
WE
OE
CS
DS3065W
1024k x 8
DQ0–7 NV SRAM
AND RTC
A0–19
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.

1 page




DS3065W pdf
3.3V Single-Piece 8Mb Nonvolatile SRAM
with Clock
Read Cycle
ADDRESSES
CE
OR
CS
OE
DOUT
(SEE NOTE 9.)
tRC
VIH VIH VIH
VIL VIL VIL
VIH
VIL
tACC
tCO
tOEC
VIH tOE
VIL
tCOE
tCOE
tOH
VIH
tOD
VIH
tOD
VOH OUTPUT
VOL DATA VALID
VOH
VOL
_____________________________________________________________________ 5

5 Page





DS3065W arduino
3.3V Single-Piece 8Mb Nonvolatile SRAM
with Clock
Detailed Description
The DS3065W is an 8Mb (1024k x 8 bits) fully static, NV
memory similar in function and organization to the
DS1265W NV SRAM, but also containing an RTC and
rechargeable ML battery. The DS3065W NV SRAM con-
stantly monitors VCC for an out-of-tolerance condition.
When such a condition 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 exe-
cuted, and no additional support circuitry is required for
microprocessor interfacing. This device can be used in
place of SRAM, EEPROM, or flash components.
User access to either the SRAM or the real-time clock
registers is accomplished with a byte-wide interface
and discrete control inputs, allowing for a direct inter-
face to many 3.3V microprocessor devices.
The DS3065W RTC contains a full-function, year 2000-
compliant (Y2KC) clock/calendar with an RTC alarm,
watchdog timer, battery monitor, and power monitor.
RTC registers contain century, year, month, date, day,
hours, minutes, and seconds data in a 24-hour BCD
format. Corrections for day of the month and leap year
are made automatically.
The DS3065W RTC registers are double-buffered into
an internal and external set. The user has direct access
to the external set. Clock/calendar updates to the exter-
nal set of registers can be disabled and enabled to
allow the user to access static data. Assuming the
internal oscillator is on, the internal registers are contin-
ually updated, regardless of the state of the external
registers, assuring that accurate RTC information is
always maintained.
The DS3065W contains interrupt (IRQ/FT) and reset
(RST) outputs, which can be used to control CPU activ-
ity. The IRQ/FT interrupt output can be used to gener-
ate an external interrupt when the RTC register values
match user-programmed alarm values. The interrupt is
always available while the device is powered from the
system supply, and it can be programmed to occur
when in the battery-backed state to serve as a system
wake-up. The IRQ/FT output can also be used as a
CPU watchdog timer. CPU activity is monitored and an
interrupt can be activated if the correct activity is not
detected. The RST output can be used to detect a sys-
tem power-down or failure and hold the CPU in a safe
state until normal power returns.
The DS3065W constantly monitors the voltage of the
internal battery. The battery-low flag (BLF) in the RTC
FLAGS register is not writeable and should always be a
0 when read. Should a 1 ever be present, the battery
voltage is below 2V and the contents of the clock and
SRAM are questionable.
The DS3065W module is constructed on a standard 256-
ball, 27mm x 27mm BGA substrate. Unlike other sur-
face-mount NV memory modules that require the battery
to be removable for soldering, the internal ML battery
can tolerate exposure to convection reflow soldering
temperatures, allowing this single-piece component to
be handled with standard BGA assembly techniques.
Table 1. RTC/Memory Operational Truth Table
CS WE
01
01
00
11
11
10
1X
0X
CE
1
1
1
0
0
0
1
0
X = Don’t care. (1) = See Figure 4.
OE
0
1
X
0
1
X
X
X
MODE
RTC Read
RTC Read
RTC Write
SRAM Read
SRAM Read
SRAM Write
Standby
Invalid (1)
ICC
Active
Active
Active
Active
Active
Active
Standby
Active
OUTPUTS
Active
High Impedance
High Impedance
Active
High Impedance
High Impedance
High Impedance
Invalid
____________________________________________________________________ 11

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