3 Description

The AT24CSW04X/AT24CSW08X provides 4,096/8,192 bits of Serial Electrically Erasable and Programmable Read‑Only Memory (EEPROM) organized as 512/1,024 words of 8 bits each. The device is optimized for use in many industrial and commercial applications where low-power and low-voltage operation are essential.

The device features a software write protection feature with five different programmable levels of protection for the EEPROM array. The protection settings of the device can be made permanent if desired. Safeguards are included to prevent accidental invocation of the permanent feature.

Additionally, each device includes a Security register with an extra 256 bits of EEPROM beyond the nominal EEPROM array. The Security register is comprised of a read-only section of 16 bytes and an additional user-programmable section of 16 bytes.

The Security register begins with a read-only section that contains a factory‑programmed ensured unique 128‑bit serial number. The time-consuming step of performing and ensuring true serialization of a product on a manufacturing line can be removed from the production flow by employing a CS or CSW Series Serial EEPROM. The 128‑bit serial number is programmed and permanently locked from future writing during the Microchip production process. Further, this 128‑bit location does not consume any of the user read/write area of the 4‑Kbit or 8‑Kbit Serial EEPROM. The uniqueness of the serial number is ensured across the entire CS or CSW Series of Serial EEPROMs, regardless of the size of the memory array or the type of interface protocol. This means that as an application’s needs for memory size or interface protocol evolve in future generations, any previously deployed serial number from any CS or CSW Series Serial EEPROM part will remain valid.

Following the 128‑bit read‑only serial number in the Security register is an additional 16 bytes of EEPROM organized as one page of 16 bytes. This region of the Security register is user‑programmable and, if so desired, can later be permanently write‑protected with a software sequence. This user‑programmable section of the Security register is ideal for applications that need to irreversibly protect critical or sensitive application data.

The AT24CSW04X/AT24CSW08X is available in a best‑in‑class 4‑ball Ultra‑Thin WLCSP package and is accessed via an I²C‑compatible two‑wire serial interface. Other package options are available upon request. The device operates with a supply voltage ranging from 1.7V to 3.6V.