M28256 256 Kbit (32Kb x8) Parallel EEPROM with Software Data Protection is a low power Parallel EEPROM with 64 bytes page write operation, support 5V and 3V power supply, using ST Microelectronics proprietary double polysilicon CMOS technology.
The M28256 is a 256 Kbit (32K x 8) low-power parallel EEPROM fabricated with STMicroelectronics proprietary double polysilicon CMOS technology. It supports both 5V and 3V single supply voltage options and offers fast access times of 90ns at 5V and 120ns at 3V. The device features enhanced end-of-write detection via Data Polling and Toggle Bit functions, along with a status register for efficient microcontroller interfacing.
| Memory Capacity | 256 Kbit (32K x 8) |
|---|---|
| Access Time (5V) | 90ns |
| Access Time (3V) | 120ns |
| Supply Voltage (Standard) | 5V + 10% |
| Supply Voltage (Low Power) | 2.7V to 3.6V |
| Endurance | >100,000 Erase/Write Cycles |
| Data Retention | >10 Years |
| Package Types | PDIP28, PLCC32 |
The access time is 90ns at 5V.
Yes, it includes a software data protection facility to inhibit write modes.
The period must be smaller than the twHwH value.