IS34C02

The IS34C02 is an electrically erasable PROM device that uses the standard 2-wire interface for communications. The IS34C02 contains a memory array of 2,048-bits (256K x 8), and is further subdivided into 16 pages of 16 bytes each for page-write mode.

The software write-protection feature is initiated with a unique irreversible instruction. After this command is transmitted, the first 128 bytes of the array become permanently read-only. This feature is popular in applications like DRAM DIMMs to retain DRAM related data. This EEPROM is offered in wide operating voltages of 1.8V to 5.5V (IS34C02-2) and 2.5V to 5.5V (IS34C02- 3) to be compatible with most application voltages. ISSI designed the IS34C02 as a low-cost and low-power 2- wire EEPROM solution. The devices are packaged in 8-pin SOIC, and 8-pin TSSOP, and 8-pin MSOP.

The IS34C02 maintains compatibility with the popular 2- wire bus protocol, so it is easy to use in applications implementing this bus type. The simple bus consists of the Serial Clock wire (SCL) and the Serial Data wire (SDA). Using the bus, a Master device such as a microcontroller is usually connected to one or more Slave devices such as the IS34C02. The bit stream over the SDA line includes a series of bytes, which identifies a particular Slave device, an instruction, an address within that Slave device, and a series of data, if appropriate. The IS34C02 has a Write Protect pin (WP) to allow blocking of any write instruction transmitted over the bus.