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M25P40 Datasheet(PDF) 6 Page - STMicroelectronics

Part No. M25P40
Description  4 Mbit, low voltage, serial Flash memory with 50 MHz SPI bus interface
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Maker  STMICROELECTRONICS [STMicroelectronics]
Homepage  http://www.st.com
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M25P40 Datasheet(HTML) 6 Page - STMicroelectronics

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Description
M25P40
6/53
1
Description
The M25P40 is a 4 Mbit (512 K × 8) Serial Flash memory, with advanced write protection
mechanisms, accessed by a high speed SPI-compatible bus.
The memory can be programmed 1 to 256 bytes at a time, using the Page Program
instruction.
The memory is organized as 8 sectors, each containing 256 pages. Each page is 256 bytes
wide. Thus, the whole memory can be viewed as consisting of 2048 pages, or 524,288
bytes.
The whole memory can be erased using the Bulk Erase instruction, or a sector at a time,
using the Sector Erase instruction.
In order to meet environmental requirements, ST offers the M25P40 in ECOPACK®
packages. ECOPACK® packages are Lead-free and RoHS compliant.
ECOPACK is an ST trademark. ECOPACK specifications are available at: www.st.com.
Figure 1.
Logic diagram
Table 1.
Signal names
Signal name
Function
Direction
C
Serial Clock
Input
D
Serial Data input
Input
Q
Serial Data output
Output
S
Chip Select
Input
W
Write Protect
Input
HOLD
Hold
Input
VCC
Supply voltage
VSS
Ground
AI04090
S
VCC
M25P40
HOLD
VSS
W
Q
C
D


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