24LCS21AT/SN

The Microchip Technology 24LCS21AT/SN is a 128 x 8-bit dual-mode Electrically Erasable PROM (EEPROM) designed for applications requiring serial transmission of configuration and control information. This device supports a 2-wire serial interface bus compatible with I2C standards, offering compatibility with 100 kHz (at 2.5V) and 400 kHz (at 5V) clock frequencies.

Key electrical specifications include a single supply voltage range of 2.5V to 5.5V, a typical active current of 1 mA, and a low standby current of 10 μA at 5.5V. The device ensures 1,000,000 erase/write cycles and data retention exceeding 200 years. It also features a hardware write-protect pin and a page write buffer for up to eight bytes.

Available in an 8-pin PDIP and SOIC package, the 24LCS21A is suitable for extended temperature ranges, specifically the industrial range of -40°C to +70°C. The surface mountable 8-SOIC package is standard for this component, facilitating integration into various electronic designs. This EEPROM is Pb-Free and RoHS Compliant.

The device operates in two modes: Transmit-Only and Bidirectional. Upon power-up, it defaults to Transmit-Only mode. A valid high-to-low transition on the SCL pin triggers Transition mode, allowing it to enter Bidirectional mode if a valid control byte is detected on the I2C bus, enabling byte-selectable read/write capabilities.