M25PE40 データシートの表示（PDF） - STMicroelectronics

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M25PE40

4 Mbit, low voltage, Page-Erasable Serial Flash memory with byte alterability, 50 MHz SPI bus, standard pinout

STMicroelectronics 

M25PE40

SUMMARY DESCRIPTION

The M25PE40 is a 4Mbit (512K 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 fol-

lowed by a Page Program cycle.

The memory is organized as 8 sectors, each con-

taining 256 pages. Each page is 256 Bytes wide.

Thus, the whole memory can be viewed as con-

sisting of 2048 pages, or 524,288 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.

The top sector of the memories can be Write Pro-

tected by Hardware (TSL).

Table 1. Signal Names

C

Serial Clock

D

Serial Data Input

Q

Serial Data Output

S

Chip Select

TSL

Top Sector Lock

Reset

Reset

VCC

Supply Voltage

VSS

Ground

Figure 3. VDFPN and SO Connections

Figure 2. Logic Diagram

VCC

D

C

S

TSL

Reset

Q

M25PE40

M25PE40

S1

Q2

TSL 3

VSS 4

8 VCC

7 Reset

6C

5D

AI09703C

VSS

AI09704C

Note: 1. There is an exposed die paddle on the underside of the

MLP8 package. This is pulled, internally, to VSS, and

must not be allowed to be connected to any other voltage

or signal line on the PCB.

2. See PACKAGE MECHANICAL section for package di-

mensions, and how to identify pin-1.

5/37

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