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PDF DS3050W Fiche technique - Maxim Integrated Products

Numéro de référence DS3050W
Description Single-Piece 4Mb Nonvolatile SRAM
Fabricant Maxim Integrated Products 
Logo Maxim Integrated Products Logo 



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DS3050W Datasheet, Description
www.DataSheet4U.com
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 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 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 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
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.
DS3050W Fiche technique
3.3V Single-Piece 4Mb Nonvolatile SRAM
with Clock
AC ELECTRICAL CHARACTERISTICS
(VCC = 3.3V ±0.3V, TA = -40°C to +85°C.)
PARAMETER
SYMBOL
Read Cycle Time
Access Time
OE to Output Valid
RTC OE to Output Valid
CE or CS to Output Valid
OE or CE or CS to Output Active
Output High Impedance from
Deselection
Output Hold from Address
Write Cycle Time
Write Pulse Width
Address Setup Time
Write Recovery Time
Output High Impedance from WE
Output Active from WE
Data Setup Time
Data Hold Time
Chip-to-Chip Setup Time
tRC
tACC
tOE
tOEC
tCO
tCOE
tOD
tOH
tWC
tWP
tAW
tWR1
tWR2
tODW
tOEW
tDS
tDH1
tDH2
tCCS
(Note 2)
(Note 2)
(Note 3)
(Note 4)
(Note 5)
(Note 2)
(Note 2)
(Note 6)
(Note 4)
(Note 5)
CONDITIONS
DS3050W-100
MIN MAX
100
100
50
60
100
5
40
5
100
75
0
5
20
40
5
40
0
20
40
UNITS
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
POWER-DOWN/POWER-UP TIMING
(TA = -40°C to +85°C.)
PARAMETER
VCC Fail Detect to CE, CS, and
WE Inactive
VCC Slew from VTP to 0V
VCC Slew from 0V to VTP
VCC Valid to CE, CS, and WE
Inactive
SYMBOL
tPD (Note 7)
tF
tR
tPU
VCC Valid to End of Write
Protection
VCC Fail Detect to RST Active
VCC Valid to RST Inactive
tREC
tRPD
tRPU
(Note 1)
(Note 1)
CONDITIONS
MIN TYP MAX UNITS
1.5 µs
150 µs
150 µs
2 ms
125 ms
3.0 µs
40 350 525 ms
_____________________________________________________________________ 3

3 Page

DS3050W pdf
3.3V Single-Piece 4Mb Nonvolatile SRAM
with Clock
Write Cycle 1
ADDRESSES
CE
OR
CS
WE
DOUT
DIN
(SEE NOTES 2, 3, 4, 6, 10–13.)
tWC
VIH VIH VIH
VIL VIL VIL
tAW
VIL VIL
tWP
tWR1
VIH
tODW
VIL VIL
HIGH
IMPEDANCE
VIH
tOEW
tDS tDH1
VIH
DATA IN STABLE
VIL
VIH
VIL
ADDRESSES
CE
OR
CS
WE
VIH
VIL
tAW
VIH
VIL
tCOE
tWC
tWP
VIL VIL
VIL VIL
tODW
VIH
VIL
tWR2
VIH
VIH
Write Cycle 2
VIH
VIL
DOUT
DIN
(SEE NOTES 2, 3, 5, 6, 10–13.)
tDS tDH2
VIH
DATA IN STABLE
VIL
VIH
VIL
6 _____________________________________________________________________

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