PDF DS1350W Data sheet ( Hoja de datos )

Número de pieza	DS1350W
Descripción	3.3V 4096K Nonvolatile SRAM
Fabricantes	Dallas Semiconductor
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No Preview Available ! www.DataSheet4U.com DS1350W PRELIMINARY DS1350W 3.3V 4096K Nonvolatile SRAM with Battery Monitor FEATURES • 10 years minimum data retention in the absence of external power • Data is automatically protected during power loss • Power supply monitor resets processor when VCC power loss occurs and holds processor in reset during VCC ramp–up • Battery monitor checks remaining capacity daily • Read and write access times as fast as 150 ns • Unlimited write cycle endurance • Typical standby current 50 µA • Upgrade for 512K x 8 SRAM, EEPROM or Flash • Lithium battery is electrically disconnected to retain freshness until power is applied for the first time • Optional industrial temperature range of –40°C to +85°C, designated IND • New PowerCap Module (PCM) package – Directly surface–mountable module – Replaceable snap–on PowerCap provides lith- ium backup battery – Standardized pinout for all nonvolatile SRAM products – Detachment feature on PowerCap allows easy removal using a regular screwdriver PIN ASSIGNMENT BW A15 A16 RST VCC WE OE CE DQ7 DQ6 DQ5 DQ4 DQ3 DQ2 DQ1 DQ0 GND 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 GND VBAT 16 17 34 33 32 31 30 29 28 27 26 25 24 23 22 21 20 19 18 34–PIN POWERCAP MODULE (PCM) (USES DS9034PC POWERCAP) PIN DESCRIPTION A0–A18 – Address Inputs DQ0–DQ7 – Data In/Data Out CE – Chip Enable WE – Write Enable OE – Output Enable RST – Reset Output BW – Battery Warning Output VCC GND – Power (+3.3 Volts) – Ground NC – No Connect A18 A17 A14 A13 A12 A11 A10 A9 A8 A7 A6 A5 A4 A3 A2 A1 A0 DESCRIPTION The DS1350W 3.3V 4096K Nonvolatile SRAM is a 4,194,304–bit, fully static, nonvolatile SRAM organized as 524,288 words by eight bits. Each NV SRAM has a self–contained lithium energy source and control cir- cuitry which constantly monitors VCC for an out–of–tol- erance condition. When such a condition occurs, the lithium energy source is automatically switched on and write protection is unconditionally enabled to prevent data corruption. Additionally, the DS1350W has dedi- cated circuitry for monitoring the status of VCC and the status of the internal lithium battery. DS1350W devices in the PowerCap Module package are directly surface mountable and are normally paired with a DS9034PC PowerCap to form a complete Nonvolatile SRAM mod- ule. The devices can be used in place of 512K x 8 SRAM, EEPROM or Flash components. 022598 1/11 1 page WRITE CYCLE 1 ADDRESSES CE WE DOUT VIH VIL tAW VIH tODW DIN SEE NOTES 2, 3, 4, 6, 7, 8 AND 12 tWC VIH VIH VIL VIL VIL VIL tWP VIL VIL HIGH IMPEDANCE tWR1 VIH tOEW tDS tDH1 VIH VIH DATA IN STABLE VIL VIL WRITE CYCLE 2 ADDRESSES CE WE VIH VIL tAW VIH VIL tCOE tWC tWP VIL VIL VIL VIL tODW VIH VIL tWR2 VIH VIH VIH VIL DOUT DIN SEE NOTES 2, 3, 4, 6, 7, 8 AND 13 tDS tDH2 VIH DATA IN STABLE VIL VIH VIL DS1350W 022598 5/11 5 Page DS1350W RECOMMENDED POWERCAP MODULE LAND PATTERN A INCHES D C PKG DIM MIN NOM MAX 16 PL A – 1.050 – B – 0.826 – C – 0.050 – D – 0.030 – E – 0.112 – BE RECOMMENDED POWERCAP MODULE SOLDER STENCIL A INCHES D C PKG DIM MIN NOM MAX 16 PL A – 1.050 – B – 0.890 – C – 0.050 – D – 0.030 – E – 0.080 – BE 022598 11/11 11 Page

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