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DS1345YE-100-IND Datasheet(PDF) 1 Page - Maxim Integrated Products |
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DS1345YE-100-IND Datasheet(HTML) 1 Page - Maxim Integrated Products |
1 / 12 page 1 of 12 032904 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 70ns Unlimited write cycle endurance Typical standby current 50 µA Upgrade for 128k x 8 SRAM, EEPROM or Flash Lithium battery is electrically disconnected to retain freshness until power is applied for the first time Full ±10% V CC operating range (DS1345Y) or optional ±5% V CC operating range (DS1345AB) Optional industrial temperature range of -40 °C to +85°C, designated IND PowerCap Module (PCM) package - Directly surface-mountable module - Replaceable snap-on PowerCap provides lithium backup battery - Standardized pinout for all nonvolatile (NV) SRAM products - Detachment feature on PowerCap allows easy removal using a regular screwdriver PIN ASSIGNMENT PIN DESCRIPTION A0 – A16 - 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 - Power (+5V) GND - Ground NC - No Connect DESCRIPTION The DS1345 1024k NV SRAMs are 1,048,576-bit, fully static, NV SRAMs organized as 131,072 words by 8 bits. Each NV SRAM has a self-contained lithium energy source and control circuitry which constantly 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. Additionally, the DS1345 devices have dedicated circuitry for monitoring the status of VCC and the status of the internal lithium battery. DS1345 devices in the PowerCap module package are directly surface mountable and are normally paired with a DS9034PC PowerCap to form a complete NV SRAM module. The devices can be used in place of 128k x 8 SRAM, EEPROM, or Flash components. DS1345Y/AB 1024k Nonvolatile SRAM with Battery Monitor www.maxim-ic.com 1 BW 2 3 A15 A16 RST VCC WE OE CE DQ7 DQ6 DQ5 DQ4 DQ3 DQ2 DQ1 DQ0 GND 4 5 6 7 8 9 10 11 12 13 14 15 16 17 NC A14 33 32 31 30 29 28 27 26 25 24 23 22 21 20 19 18 A13 A12 A11 A10 A9 A8 A7 A6 A5 A4 A3 A2 A1 A0 34 NC GND VBAT 34-Pin PowerCap Module (PCM) (Uses DS9034PC PowerCap) |
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