Maker : Maxim Integrated Products
Part No. : DS2045W

  Datasheet PDF : DS2045W.pdf
  Cross Reference : DS2045W Cross Reference
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Shortcut : DS2045AB  DS2045L  DS2045W  DS2045Y 

Product Information

Rev 1; 1/05 w The DS2045W is a 1Mb 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 VCC 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 modified. When VCC is powered down or out of tolerance, the controller write-protects the SRAM’s contents and powers the SRAM from the battery. The DS2045W also contains a power-supply monitor output, RST, which can be used as a CPU supervisor for a microprocessor. w w .D at Sh a et e 4U . om c DS2045W 3.3V Single-Piece 1Mb Nonvolatile SRAM Features ♦ Single-Piece, Reflowable, PBGA Package Footprint ♦ Internal ML Battery and Charger ♦ Unconditionally Write-Protects SRAM when VCC is Out-of-Tolerance ♦ Automatically Switches to Battery Supply when VCC Power Failures Occur ♦ Internal Power-Supply Monitor Detects Power Fail Below Nominal VCC (3.3V) ♦ Reset Output can be used as a CPU Supervisor for a Microprocessor ♦ Industrial Temperature Range (-40°C to +85°C) ♦ UL Recognized 27mm2 General Description DS2045W Applications RAID Systems and Servers Industrial Controllers Gaming Router/Switches POS Terminals Data-Acquisition Systems Fire Alarms PLC Pin Configuration appears at end of data sheet. PART DS2045W-100 TEMP RANGE -40°C to +85°C PIN-PACKAGE 256 Ball 27mm2 BGA Module w 8051 MICROPROCESSOR w w P4.0 P3.6 P3.7 P1.0–7 P4.4 P2.0–7 P3.2 .D (CE0) (WR) (RD) t a S a 8 BITS e h t e U 4 .c m o Ordering Information SPEED (ns) 100 SUPPLY TOLERANCE (%) 3.3V ±0.3V Typical Operating Circuit CE WE OE AD0–AD7 DQ0–7 DS2045W 128k x 8 NV SRAM 8 BITS A0–7 A16 8 BITS (INT0) A8–15 RST w For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at w 1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com. w ______________________________________________ Maxim Integrated Products .D at Sh a et e 4U . om c 1 DS2045W 3.3V Single-Piece 1Mb Nonvolatile SRAM DS2045W ABSOLUTE MAXIMUM RATINGS Voltage on Any Pin Relative to Ground .................-0.3V to +4.6V Operating Temperature Range ...........................-40°C to +85°C Storage Temperature Range ...............................-40°C to +85°C Soldering Temperature...................See IPC/JEDEC J-STD-020C Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. RECOMMENDED OPERATING CONDITIONS (TA = -40°C to +85°C) PARAMETER Supply Voltage Input Logic 1 Input Logic 0 SYMBOL VCC VIH VIL CONDITIONS MIN 3.0 2.2 0 TYP 3.3 MAX 3.6 VCC 0.4 UNITS V V V DC ELECTRICAL CHARACTERISTICS (VCC = 3.3V ±0.3V, TA = -40°C to +85°C.) PARAMETER Input Leakage Current I/O Leakage Current Output-Current High Output-Current Low Output-Current Low RST Standby Current Operating Current Write Protection Voltage SYMBOL IIL IIO IOH IOL IOL RST ICCS1 ICCS2 ICCO1 VTP CE = VCC At 2.4V At 0.4V At 0.4V (Note 1) CE = 2.2V CE = VCC - 0.2V tRC = 200ns, outputs open 2.8 2.9 CONDITIONS MIN -1.0 -1.0 -1.0 2.0 10.0 0.5 0.2 7 5 50 3.0 TYP MAX +1.0 +1.0 UNITS µA µA mA mA mA mA mA V CAPACITANCE (TA = +25°C) PARAMETER Input Capacitance Input/Output Capacitance SYMBOL CIN COUT Not tested Not tested CONDITIONS MIN TYP 7 7 MAX UNITS pF pF 2 _____________________________________________________________________ DS2045W 3.3V Single-Piece 1Mb Nonvolatile SRAM AC ELECTRICAL CHARACTERISTICS (VCC = 3.3V ±0.3V, TA = -40°C to +85°C.) PARAMETER Read Cycle...

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