MR25H256CDC EverSpin Technologies Inc, MR25H256CDC Datasheet - Page 7

• Manufacturer Part Number: MR25H256CDC
• Description: IC MRAM 256KBIT 40MHZ 8DFN
• Manufacturer: EverSpin Technologies Inc

Specifications of MR25H256CDC

• Format - Memory: RAM
• Memory Type: MRAM (Magnetoresistive RAM)
• Memory Size: 256K (32K x 8)
• Speed: 40MHz
• Interface: SPI Serial
• Voltage - Supply: 2.7 V ~ 3.6 V
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 8-VDFN Exposed Pad
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 819-1015

Everspin Technologies © 2010
The WRSR command is entered by driving CS low, sending the command code and status register write data
byte, and then driving CS high.
SPI COMMUNICATIONS PROTOCOL
SCK
Read Data Bytes (READ)
CS
SO
The Read Data Bytes (READ) command allows data bytes to be read starting at an address specified by the
16-bit address. The data bytes are read out sequentially from memory until the read operation is terminat-
ed by bringing CS high The entire memory can be read in a single command. The address counter will roll
over to 0000h when the address reaches the top of memory.
The READ command is entered by driving CS low and sending the command code. The memory drives the
read data bytes on the SO pin. Reads continue as long as the memory is clocked. The command is termi-
nated by bring CS high.
SI
0
0
0
1
0
SCK
CS
SO
2
SI
Instruction (03h)
0
3
0
4
0
0
0
5
High Impedance
0
1
1
6
0
2
1
7
Instruction (01h)
0
MSB
3
X
8
0
4
X
Figure 2.4 WRSR
9
Figure 2.5 READ
0
5
X
10
High Impedance
16-Bit Address
0
6
7
1
7
3
28
MSB
7
8
2
29
6
Document Number: MR25H256 Rev. 2, 4/2010
9
1
30
5
10
Status Register In
0
31
4
11
MSB
7
32
3
12
6
32
2
13
5
32
1
14
Data Out 1
4
32
0
15
MR25H256
3
32
Mode 3
Mode 0
2
32
1
32
0
32
7
Data Out 2