MR25H40CDC Ver la hoja de datos (PDF) - Extech Instruments Corporation.

Número de pieza

componentes Descripción

Fabricante

MR25H40CDC

NVRAM 4Mb 3.3V 512Kx8 SPI

Extech Instruments Corporation. 

MR20H40 / MR25H40

OVERVIEW

The MR2xH40 family is an SPI interface MRAM family with a memory array logically organized as 512Kx8

using the four pin interface of chip select (CS), serial input (SI), serial output (SO) and serial clock (SCK) of the

serial peripheral interface (SPI) bus. The MRAM implements a subset of commands common to SPI EEPROM

and SPI Flash components. This allows the SPI MRAM to replace these components in the same socket

and interoperate on a shared SPI bus. The SPI MRAM offers superior write speed, unlimited endurance, low

standby & operating power, and simple, reliable data retention compared to other serial memory alterna-

tives.

Figure 1 – Block Diagram

WP

Instruction Decode

CS

Clock Generator

HOLD

Control Logic

SCK

Write Protect

Instruction Register

512Kb x 8

MRAM ARRAY

Address Register

19

8

Counter

SI

Data I/O Register

SO

4

Nonvolatile Status

Register

System Configuration

Single or multiple devices can be connected to the bus as shown in Figure 2. Pins SCK, SO and SI are com-

mon among devices. Each device requires CS and HOLD pins to be driven separately.

Figure 2 – System Configuration

SCK

MOSI

MISO

SPI

Micro Controller

CS1

HOLD 1

CS2

HOLD2

SO SI SCK

EVERSPIN SPI MRAM 1

CS

HOLD

Copyright © Everspin Technologies 2014

5

SO SI SCK

EVERSPIN SPI MRAM 2

CS

HOLD

MOSI = Master Out Slave In

MISO = Master In Slave Out

MR20H40 / MR25H40 Revision 11, 8/2014

Share Link: