DS1345W

19-5587; Rev 10/10 www.maxim-ic.com DS1345W 3.3V 1024k 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 of 100 ns  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  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 SRAM products - Detachment feature on PowerCap allows easy removal using a regular screwdriver PIN ASSIGNMENT BW 1 A15 2 A16 3 RST 4 VCC 5 WE 6 OE 7 CE 8 DQ7 9 DQ6 10 DQ5 11 DQ4 12 DQ3 13 DQ2 14 DQ1 15 DQ0 16 GND 17 GND VBAT 34 NC 33 NC 32 A14 31 A13 30 A12 29 A11 28 A10 27 A9 26 A8 25 A7 24 A6 23 A5 22 A4 21 A3 20 A2 19 A1 18 A0 34-Pin PowerCap Module (PCM) (Uses DS9034PC+ or DS9034PCI+ PowerCap) PIN DESCRIPTION A0-A16 - Address Inputs DQ0-DQ7 - Data In/Data Out CE - Chip Enable WE - Write Enable OE - Output Enable ...