DS3050W Maxim Integrated Products, DS3050W Datasheet

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DS3050W

Manufacturer Part Number
DS3050W
Description
Manufacturer
Maxim Integrated Products
Datasheet

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Part Number
Manufacturer
Quantity
Price
Part Number:
DS3050W-100
Manufacturer:
DALLAS
Quantity:
28
Part Number:
DS3050W-100
Quantity:
7
Part Number:
DS3050W-100#
Manufacturer:
Maxim Integrated
Quantity:
10 000
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
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
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).
RAID Systems and Servers
POS Terminals
Industrial Controllers
Data-Acquisition Systems
Rev 0; 4/05
Pin Configuration appears at end of data sheet.
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-100
PART
CC
is applied to the module, it recharges
3.3V Single-Piece 4Mb Nonvolatile SRAM
MICROPROCESSOR
-40°C to +85°C
TEMP RANGE
General Description
OR DSP
ADDRESS
DATA
INT
WR
INT
CE
RD
CS
Gaming
Fire Alarms
PLCs
Routers/Switches
Applications
______________________________________________ Maxim Integrated Products
256-ball 27mm x 27mm BGA Module
PIN-PACKAGE
CC
is
19 BITS
8 BITS
♦ Single-Piece, Reflowable, 27mm x 27mm BGA
♦ Internal Manganese Lithium Battery and Charger
♦ Integrated Real-Time Clock
♦ Unconditionally Write-Protects the Clock and
♦ Automatically Switches to Battery Supply when
♦ Reset Output can be Used as a CPU Supervisor
♦ Interrupt Output can be Used as a CPU Watchdog
♦ Industrial Temperature Range (-40°C to + 85°C)
♦ UL Recognized
Package Footprint
SRAM when V
V
Timer
CC
Power Failures Occur
Typical Operating Circuit
CC
SPEED
is Out-of-Tolerance
100ns
CE
DQ0–7
A0–18
IRQ/FT
WE
OE
CS
RST
Ordering Information
DS3050W
NV SRAM
AND RTC
512k x 8
with Clock
SUPPLY VOLTAGE (%)
3.3V ±0.3V
Features
1

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DS3050W Summary of contents

Page 1

... Rev 0; 4/05 3.3V Single-Piece 4Mb Nonvolatile SRAM 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 is applied to the module, it recharges ...

Page 2

Single-Piece 4Mb Nonvolatile SRAM with Clock ABSOLUTE MAXIMUM RATINGS Voltage Range on Any Pin Relative to Ground......-0.3V to +4.6V Operating Temperature Range ...........................-40°C to +85°C Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the ...

Page 3

... OEW t (Note (Note 4) DH1 t (Note 5) DH2 t CCS CONDITIONS t (Note REC t (Note 1) RPD t (Note 1) RPU _____________________________________________________________________ with Clock DS3050W-100 UNITS MIN MAX 100 ns 100 100 100 ...

Page 4

Single-Piece 4Mb Nonvolatile SRAM with Clock DATA RETENTION (T = +25°C.) A SYMBOL PARAMETER Expected Data-Retention Time (Per Charge) IRQ/FT and RST are open-drain outputs and cannot source current. External pullup resistors should be connected to these Note 1: ...

Page 5

Single-Piece 4Mb Nonvolatile SRAM ADDRESSES OUT (SEE NOTE 9.) _____________________________________________________________________ ACC OEC ...

Page 6

Single-Piece 4Mb Nonvolatile SRAM with Clock ADDRESSES OUT D IN (SEE NOTES 10–13.) ADDRESSES OUT D IN (SEE NOTES 10–13.) 6 ...

Page 7

Single-Piece 4Mb Nonvolatile SRAM 2. CE, WE AND CS BACKUP CURRENT SUPPLIED FROM LITHIUM BATTERY RST (SEE NOTES 1, 7 3.3V +25°C, unless otherwise noted.) CC ...

Page 8

Single-Piece 4Mb Nonvolatile SRAM with Clock (V = 3.3V +25°C, unless otherwise noted PERCENT CHANGE CHARGE vs. TEMPERATURE 1 3.3V BAT CHARGE 0.5 0 -0.5 -1.0 -40 -15 ...

Page 9

Single-Piece 4Mb Nonvolatile SRAM BALLS NAME A1, A2, A3, A4 GND Ground Interrupt/Frequency Test IRQ/FT B1, B2, B3, B4 Output C1, C2, C3, C4 A15 Address Input 15 D1, D2, D3, D4 A16 Address Input 16 RST E1, E2, ...

Page 10

... BATTERY-CHARGING/SHORTING GND PROTECTION CIRCUITRY (U.L. RECOGNIZED A0–A18 10 ____________________________________________________________________ 32.768kHz CS A0-A3 REAL-TIME CLOCK WE OE DELAY TIMING CIRCUITRY CHARGER REDUNDANT LOGIC REDUNDANT CURRENT-LIMITING SERIES FET RESISTOR Functional Diagram IRQ/FT RST UNINTERRUPTED POWER SUPPLY FOR THE SRAM AND RTC SRAM DQ0–7 WE DS3050W ...

Page 11

... Single-Piece 4Mb Nonvolatile SRAM Detailed Description The DS3050W is a 4Mb (512k x 8 bits) fully static, NV memory similar in function and organization to the DS1250W NV SRAM, but also containing an RTC and rechargeable ML battery. The DS3050W NV SRAM con- stantly monitors V for an out-of-tolerance condition. CC When such a condition occurs, the lithium energy source is automatically switched on and write protection is unconditionally enabled to prevent data corruption ...

Page 12

... BMB0–BMB4 = Watchdog multiplier bits. RB0, RB1 = Watchdog resolution bits. 12 ____________________________________________________________________ The DS3050W executes an SRAM write cycle whenever CS is inactive (high) and the CE and WE signals are active (low) after address inputs are stable. The later- occurring falling edge determines the start of the write cycle ...

Page 13

... The alarm can be programmed to activate on a specific day of the month or repeat every day, hour, minute, or second. It can also be programmed to go off while the DS3050W is in the Data Retention Mode to serve as a system wake-up. Alarm mask bits AM1 to AM4 control the alarm mode (see Table 3). Configurations not listed in the table will default to the once-per-second mode to notify the user of an incorrect alarm setting ...

Page 14

Single-Piece 4Mb Nonvolatile SRAM with Clock Table 3. Alarm Mask Bits AM4 AM3 AM2 When the RTC register values match alarm register set- tings, ...

Page 15

Single-Piece 4Mb Nonvolatile SRAM A0–A3 IRQ/FT Figure 2. Prevent Accidental Clearing of IRQ Waveforms V CC ABE IRQ/FT HIGH IMPEDANCE Figure 3. Battery Backup Mode Alarm Waveforms INADVERTENT WRITE OR READ OF ...

Page 16

... A 96 hour initial bat- tery charge time is recommended for new system CC installations. without additional To achieve the best results when using the DS3050W, assure that all V ), the SW decouple the power supply with a 0.1µF capacitor. Use a high-quality, ceramic surface-mount capacitor if pos- sible ...

Page 17

... Once the battery is charged its lifetime depends primarily on the V The DS3050W can maintain data from a single, initial charge for years. Once recharged, this deep- discharge cycle can be repeated for times, producing a worst-case service life of 40 years. More typical duty cycles are of shorter duration, enabling the DS3050W to be charged hundreds of times, and extending the service life well beyond 40 years ...

Page 18

... For the latest package outline information go to www.maxim-ic.com/packages.) DS3050W BGA modules are recognized by Underwriters Laboratory (UL) under file E99151. Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied ...

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