M45PE20 datasheet(5/35 Pages) STMICROELECTRONICS

Part #	M45PE20

Description	2 Mbit, Low Voltage, Page-Erasable Serial Flash Memory With Byte-Alterability and a 25 MHz SPI Bus Interface

PDF	35 Pages

Scroll/Zoom	100%

Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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M45PE20

SUMMARY DESCRIPTION

The M45PE20 is a 2Mbit (256K 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 4 sectors, each con-

taining 256 pages. Each page is 256 bytes wide.

Thus, the whole memory can be viewed as con-

sisting of 1024 pages, or 262,144 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.

Figure 2. Logic Diagram

Figure 3. SO and VDFPN Connections

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.

Table 1. Signal Names

Reset

AI07400

VCC

M45PE20

VSS

AI07401

VCC

VSS

Reset

M45PE20

Serial Clock

Serial Data Input

Serial Data Output

Chip Select

Write Protect

Reset

VCC

Supply Voltage

VSS

Ground

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