M95128 Datasheet (ST Microelectronics) - 256/128 Kbit Serial SPI Bus EEPROM With High Speed Clock

M95128, 256/128 Kbit Serial SPI Bus EEPROM With High Speed Clock

These SPI-compatible electrically erasable programmable memory (EEPROM) devices are organized as 32K x 8 bits (M95256) and 16K x 8 bits (M95128), and operate down to 2.7 V (for the Figure 1.

Logic Diagram VCC Table 1.

Signal Names C D Q Serial Clock Serial Data Input Serial Data Output D C S W M9

M95256 M95128 256/128 Kbit Serial SPI Bus EEPROM With High Speed Clock PRELIMINARY DATA s s s s SPI Bus Compatible Serial Interface Supports Positive Clock SPI Modes 5 MHz Clock Rate (maximum) Single Supply Voltage: 4.5V to 5.5V for M95xxx 2.7V to 3.6V for M95xxx-V 2.5V to 5.5V for M95xxx-W 1.8V to 3.6V for M95xxx-R 8 1 PSDIP8 (BN) 0.25 mm frame 14 1 TSSOP14 (DL) 169 mil width s s Status Register Hardware and Software Protection of the Status Register

M95128 Features

* of the memory device are summarized in Table 3. The hardware write protection, controlled by the W pin, restricts write access to the Status Register (though not to the WIP and WEL bits, which are set or reset by the device internal logic). Bit 7 of the status register (as shown in Table 5) is the