m45pe40 STMicroelectronics, m45pe40 Datasheet - Page 6

• Manufacturer Part Number: m45pe40
• Description: 4 Mbit, Low Voltage, Page-erasable Serial Flash Memory With Byte-alterability And A 50 Mhz Spi Bus Interface
• Manufacturer: STMicroelectronics

Description
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Description
The M45PE40 is a 4 Mbit (512 K x 8 bit) Serial Paged Flash Memory accessed by a high
speed SPI-compatible bus.
The memory can be written or programmed 1 to 256 bytes at a time, using the Page Write or
Page Program instruction. The Page Write instruction consists of an integrated Page Erase
cycle followed by a Page Program cycle.
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 524288 bytes.
The memory can be erased a page at a time, using the Page Erase instruction, or a sector
at a time, using the Sector Erase instruction.
In order to meet environmental requirements, ST offers the M45PE40 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.
Table 1.
C
D
Q
S
W
Reset
V
V
CC
SS
Signal name
Logic diagram
Signal names
Reset
W
D
C
S
Serial Clock
Serial Data Input
Serial Data Output
Chip Select
Write Protect
Reset
Supply voltage
Ground
V CC
V SS
M45PE40
Function
Q
AI04040C
Input
Input
Output
Input
Input
Input
Direction
M45PE40