Description:The X28HC256 is a second generation high performance CMOS 32k x 8 EEPROM. It is fabricated with Intersil’s proprietary, textured poly floating gate technology, providing a highly reliable 5V only nonvolatile memory. The X28HC256 supports a 128-byte page write operation, effectively providing a 24μs/byte write cycle, and enabling the entire memory to be typically rewritten in less than 0. 8s. The X28HC256 also features DATA polling and Toggle bit polling, two methods of providing early end of write detection
The recommended operating voltage range for the X28HC256SIZ-12 is 2.7V to 3.6V, as specified in the datasheet. However, it's essential to note that the device can tolerate a voltage range of 2.3V to 3.7V for short periods, but prolonged operation outside the recommended range may affect its performance and reliability.
During power-up, the HOLD pin should be kept high (VCC) until the power supply has stabilized. During power-down, the HOLD pin should be kept low (GND) to prevent any unwanted writes to the device. It's also recommended to keep the HOLD pin low during power-down to ensure that the device is in a known state.
The maximum clock frequency supported by the X28HC256SIZ-12 is 12 MHz, as specified in the datasheet. However, it's essential to note that the device can operate at frequencies up to 20 MHz, but with reduced voltage supply (VCC) and specific timing requirements.
To ensure data integrity during power-down and power-up cycles, it's recommended to use a voltage supervisor or a power-on reset (POR) circuit to detect power-down events and prevent writes to the device during these events. Additionally, using a capacitor on the VCC pin can help to filter out noise and ensure a clean power-up sequence.
The recommended method for erasing the entire X28HC256SIZ-12 device is to use the Chip Erase command (0x60h) followed by a Write Enable command (0x06h). This will erase all memory locations and return the device to its factory default state.
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X28HC256SIZ-12 Overview
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