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M29F040B

SUMMARY DESCRIPTION

The M29F040B is a 4 Mbit (512Kb x8) non-volatile

memory that can be read, erased and repro-

grammed. These operations can be performed us-

ing a single 5V 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

M29F040B is fully backward compatible with the

M29F040.

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

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.

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 TSOP32 (8 x 20mm),

PLCC32 and PDIP32 packages and it is supplied

with all the bits erased (set to ‘1’).

Note: 1. Except for the rating "Operating Temperature Range", stresses above those listed in the Table "Absolute Maximum Ratings" may

cause permanent damage to the device. These are stress ratings only and operation of the device at these or any other conditions

above those indicated in the Operating sections of this specification is not implied. Exposure to Absolute Maximum Rating condi-

tions for extended periods may affect device reliability. Refer also to the STMicroelectronics SURE Program and other relevant qual-

ity documents.

2. Minimum Voltage may undershoot to –2V during transition and for less than 20ns during transitions.

Symbol

Parameter

Value

Unit

Ambient Operating Temperature (Temperature Range Option 1)

0 to 70

°C

Ambient Operating Temperature (Temperature Range Option 6)

–40 to 85

°C

Ambient Operating Temperature (Temperature Range Option 3)

–40 to 125

°C

Temperature Under Bias

–50 to 125

°C

Storage Temperature

–65 to 150

°C

(2)

Input or Output Voltage

–0.6 to 6

V

Supply Voltage

–0.6 to 6

V

Identification Voltage

–0.6 to 13.5

V

Table 3. Uniform Block Addresses, M29F040B

#

Size

(Kbytes)

Address Range

7

64

70000h-7FFFFh

6

64

60000h-6FFFFh

5

64

50000h-5FFFFh

4

64

40000h-4FFFFh

3

64

30000h-3FFFFh

2

64

20000h-2FFFFh

1

64

10000h-1FFFFh

0

64

00000h-0FFFFh