Datasheet

memorix elektronik
PCMCIA / JEIDA SRAM CARD 8Bit
Features
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PCMCIA / JEIDA standard
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Dual back-up battery design
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1 Mbytes ~ 8 Mbytes memory capacity
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BR2325 and CR2025 used as main battery
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8 Bit data bus
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Battery voltage detection function
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Fast access time : 150ns (maximum)
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Built-in write protect switch
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Attribute memory : 2K byte E2PROM '
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Battery case lock system
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Connector type : 2-piece,2-row,68 pins
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Single +5V operating voltage
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Credit card size : 54.0 x 85.6 x 3.3 (mm)
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Commercial / Industrial grade
General Description
memorix high performance SRAM cards conform to the PCMCIA / JEIDA international
standard and consist of multiple very low power consumption CMOS SRAM ICs , decoder
IC and power control IC mounted on a very thin printed circuit board using surface
mounting technology. With the dual back-up battery design , each SRAM card contains a
replaceable but non-rechargeable 3V lithium battery (main battery) and an on-board
rechargeable but non-replaceable battery (auxiliary battery) for data retention. This design
allows replacement of main battery without data loss for 20 minutes approximately. Digital
signals on the BVD1*/BVD2* pins were used to alarm the user whether the main battery
should be replaced to prevent the stored data from loss. With the flexible and user-friendly
design , both BR2325 and CR2025 can be used as main battery. There is battery case lock
system to prevent battery dropping from the card. Also , with the write-protect switch
design , data will not be written into the card by accident.Memory card attribute information
represents various attribute information of a card and is stored at EVEN address of a “
attribute memory” space which is enabled by asserting REG* signal. Regarding to the
attribute information format , please refer to the PCMCIA 2.0 or JEIDA 4.1 specification.
With the flexible design of this series cards , they provide 2K bytes E2PROM available for
attribute memory