M29W004 datasheet(2/20 Pages) STMICROELECTRONICS

2 / 20 page

M29W004BT, M29W004BB

2/20

Figure 2. TSOP Connections

VSS

DQ1

DQ2

A11

A17

A14

A15

DQ7

A16

DQ5

DQ3

VCC

DQ4

DQ6

A18

AI02950

M29W004BT

M29W004BB

A12

A13

A10

VCC

DQ0

VSS

Table 1. Signal Names

A0-A18

Address Inputs

DQ0-DQ7

Data Inputs/Outputs

Chip Enable

Output Enable

Write Enable

Reset/Block Temporary Unprotect

Ready/Busy Output

VCC

Supply Voltage

VSS

Ground

Not Connected Internally

be protected independently to prevent accidental

Program or Erase commands from modifying the

memory. Program and Erase commands are writ-

ten to the Command Interface of the memory. An

on-chip Program/Erase Controller simplifies the

process of programming or erasing the memory by

taking care of all of the special operations that are

required to update the memory contents. The end

of a program or erase operation can be detected

and any error conditions identified. The command

set required to control the memory is consistent

with JEDEC standards.

The blocks in the memory are asymmetrically ar-

ranged, see Tables 3 and 4, Block Addresses. The

first or last 64 Kbytes have been divided into four

additional blocks. The 16 Kbyte Boot Block can be

used for small initialization code to start the micro-

processor, the two 8 Kbyte Parameter Blocks can

be used for parameter storage and the remaining

32 Kbyte is a small Main Block where the applica-

tion may be stored.

Chip Enable, Output Enable and Write Enable sig-

nals control the bus operation of the memory.

They allow simple connection to most micropro-

cessors, often without additional logic.

The memory is offered in a TSOP40 (10 x 20mm)

package and it is supplied with all the bits erased

(set to ’1’).

SUMMARY DESCRIPTION

The M29W004B is a 4 Mbit (512Kb x8) non-vola-

tile memory that can be read, erased and repro-

grammed. These operations can be performed

using a single low voltage (2.7 to 3.6V) supply. On

power-up the memory defaults to its Read mode

where it can be read in the same way as a ROM or

EPROM. The M29W004B is fully backward com-

patible with the M29W004.

The memory is divided into blocks that can be

erased independently so it is possible to preserve

valid data while old data is erased. Each block can

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