Datasheet

Description M95256-W M95256-R M95256-DR M95256-DF

6/52 DocID12276 Rev 20

1 Description

The M95256 devices are Electrically Erasable PROgrammable Memories (EEPROMs)

organized as 32768 x 8 bits, accessed through the SPI bus.

The M95256-W can operate with a supply voltage from 2.5 V to 5.5 V, the M95256-R and

M95256-DR can operate with a supply voltage from 1.8 V to 5.5 V, and the M95256-DF can

operate with a supply voltage from 1.7 V to 5.5 V, over an ambient temperature range of

-40

°C / +85 °C.

The M95256-Dx offers an additional page, named the Identification Page (64 bytes). The

Identification Page can be used to store sensitive application parameters which can be

(later) permanently locked in Read-only mode.

Figure 1. Logic diagram

The SPI bus signals are C, D and Q, as shown in Figure 1 and Table 1. The device is

selected when Chip Select (S) is driven low. Communications with the device can be

interrupted when the

HOLD is driven low.

Table 1. Signal names

Signal name Function Direction

C Serial Clock Input

D Serial Data Input Input

Q Serial Data Output Output

Chip Select Input

Write Protect Input

HOLD

Hold Input

Supply voltage -

Ground -

AI01789C

M95xxx

HOLD