IS23SC4428 Features ! 1024 x 8 bits serial EEPROM ! Byte-wise addressing ! Random read access to any memory location ! 2-byte programmable security code (PSC) protection ! Manufactured with low power CMOS technology ! Single 5V supply with Vpp internally generated ! 20KHz read access; 5mS programming time ! Operating temperature range from 0C to 70C ! Highly reliable 1,000,000 erase/write cycles; 10 years data retention Security ! Write protected with 2-byte PSC ! Without entering PSC, only read access is possible ! Permanent blocking of PSC after a maximum of eight attempts on PSC ! Each byte is protected individually by its own protect bit ! Provides transportation code during device manufacturing Description IS23SC4428 contains 1024 x 8 bits serial EEPROM with programmable write protection for each byte. Random 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 ° Santa Clara, CA 95054 ° Tel: 408.588.0800 ° Fax: 408.588.0806 ° Email: [email protected] ° Web: www.issi.com To Order ISSI REGIONAL SALES OFFICES Headquarters & West Coast Office Santa Clara, California PHONE: 408-588-0800 FAX: 408-588-0805 E-MAIL: [email protected] www.issi.com East Coast Office Nashua, NH PHONE: 603-594-4176 FAX: 603-594-4181 E-MAIL: [email protected] Central Office Dallas, TX PHONE: 972-488-9691 FAX: 877-716-5582 E-MAIL: [email protected] Europe Devon, PHONE: FAX: E-MAIL: Office England 44-1752-764285 44-1752-764289 [email protected] China Offices Shanghai PHONE: +86 21 5080 2288 FAX: +86 21 5080 2028 E-MAIL: [email protected] ISO contact Pad Description C1 Vcc 5V power supply C2 RST Reset C3 CLK Serial clock C4 N/C No connect C5 GND Ground C6 N/C No connect C7 I/O Serial data I/O(Open drain) C8 N/C No connect Shenzhen PHONE: 86755-663-3977 FAX: 86755-663-3984 E-MAIL: [email protected] Suzhou PHONE: 86512-725-0384 FAX: 86512-725-0536 E-MAIL: [email protected] Beijing PHONE: 86-10-6824-3301 FAX: 86-10-6816-9097 E-MAIL: [email protected] Hong Kong PHONE: 852-2319-2211 FAX: 852-2319-2004 Integrated Silicon Solution, Inc. 2231 Lawson Lane ° Santa Clara, CA 95054 ° Tel: 408.588.0800 ° Fax: 408.588.0806 ° Email: [email protected] Web: www.issi.com