M29W641DH datasheet(5/42 Pages) STMICROELECTRONICS

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M29W641DH, M29W641DL, M29W641DU

SUMMARY DESCRIPTION

The M29W641D is a 64 Mbit (4Mb x16) non-vola-

tile memory that can be read, erased and repro-

grammed. These operations can be performed

using a single, low voltage, 2.7V to 3.6V VCC sup-

ply for the circuitry and a 1.8V to 3.6V VCCQ supply

for the Input/Output pins. An optional 12 V VPP

power supply is provided to speed up customer

programming.

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 highest address block of the M29W641DH or

the lowest address block of the M29W641DL can

be protected from accidental programming or era-

sure using the WP pin (if WP = VIL). The

M29W641DU does not feature the WP pin.

Each block can be erased independently so it is

possible to preserve valid data while old data is

erased. The blocks can be protected to prevent

accidental Program or Erase commands from

modifying the memory. Program and Erase com-

mands are written 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 op-

erations that are required to update the memory

contents. The end of a program or erase operation

can be detected and any error conditions identi-

fied. The command set required to control the

memory is consistent with JEDEC standards.

The M29W641D has an extra block, the Extended

Block, (of 32 KWords) that can be accessed using

a dedicated command. The Extended Block can

be protected and so is useful for storing security

information. However the protection is not revers-

ible, once protected the protection cannot be un-

done.

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 48-pin TSOP package

(M29W641DL and M29W641DH) or in a 63-ball TF-

BGA package (M29W641DU). All devices are deliv-

ered with all the bits erased (set to 1).

Figure 2. Logic Diagram

Table 1. Signal Names

A0-A21

Address Inputs

DQ0-DQ7

Data Inputs/Outputs

DQ8-

DQ15

Data Inputs/Outputs

Chip Enable

Output Enable

Write Enable

Reset/Block Temporary Unprotect

(M29W641DH and M29W641DL only)

Ready/Busy Output (M29W641DU

only)

Write Protect

VCC

Supply Voltage

VCCQ

Supply Voltage for Input/Output

VPP

Supply Voltage for Fast Program

(optional)

VSS

Ground

AI06697b

A0-A21

DQ0-DQ15

VCC

M29W641D

VSS

VPP

VCCQ

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