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M29W040B

SIGNAL DESCRIPTIONS

See Figure 1, Logic Diagram, and Table 1, Signal

Names, for a brief overview of the signals connect-

ed to this device.

Address Inputs (A0-A18). The Address Inputs

select the cells in the memory array to access dur-

ing Bus Read operations. During Bus Write opera-

tions they control the commands sent to the

Command Interface of the internal state machine.

Data Inputs/Outputs (DQ0-DQ7). The Data In-

puts/Outputs output the data stored at the selected

address during a Bus Read operation. During Bus

Write operations they represent the commands

sent to the Command Interface of the internal state

machine.

Chip Enable (E). The Chip Enable, E, activates

the memory, allowing Bus Read and Bus Write op-

erations to be performed. When Chip Enable is

Output Enable (G). The Output Enable, G, con-

trols the Bus Read operation of the memory.

Write Enable (W). The Write Enable, W, controls

the Bus Write operation of the memory’s Com-

mand Interface.

supplies the power for all operations (Read, Pro-

gram, Erase etc.).

Supply Voltage is less than the Lockout Voltage,

cidentally damaging the data during power-up,

power-down and power surges. If the Program/

Erase Controller is programming or erasing during

this time then the operation aborts and the memo-

ry contents being altered will be invalid.

A 0.1µF capacitor should be connected between

pin to decouple the current surges from the power

supply. The PCB track widths must be sufficient to

carry the currents required during program and

all voltage measurements.

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

Temperature Under Bias

–50 to 125

°C

Storage Temperature

–65 to 150

°C

(2)

Input or Output Voltage

–0.6 to 4

V

Supply Voltage

–0.6 to 4

V

Identification Voltage

–0.6 to 13.5

V

Table 3. Uniform Block Addresses, M29W040B

#

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