IS23SC4428
Features
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1024 x 8 bits serial EEPROM
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Byte-wise addressing
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Random read access to any memory location
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2-byte programmable security code (PSC) protection
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Manufactured with low power CMOS technology
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Single 5V supply with Vpp internally generated
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20KHz read access; 5mS programming time
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Operating temperature range from 0C to 70C
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Highly reliable 1,000,000 erase/write cycles; 10 years
data retention
Security
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Write protected with 2-byte PSC
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Without entering PSC, only read access is possible
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Permanent blocking of PSC after a maximum of eight attempts on PSC
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Each byte is protected individually by its own protect bit
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Provides transportation code during device manufacturing
Description
IS23SC4428 contains 1024 x 8 bits serial EEPROM with programmable write protection for each byte. Ran-
dom access to any byte except PSC is always possible. The memory can also be written/erased byte by byte
after the two bytes PSC are verified successfully. Each byte in the memory is protected by an its individual
protect bit. The protect bit is one-time programmable and cannot be erased. After the protect bit is enabled,
the corresponding byte cannot be changed again.
Integrated Silicon Solution, Inc.
2231 Lawson Lane
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Santa Clara, CA 95054
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Tel: 408.588.0800
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Fax: 408.588.0806
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Email: sales@issi.com
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Web: www.issi.com
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