M27W032 datasheet(6/23 Pages) STMICROELECTRONICS

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M27W032

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SIGNAL DESCRIPTIONS

See Figure 2, Logic Diagram, and Table 1, Signal

Names, for a brief overview of the signals connect-

ed to this device.

Address Inputs (A0-A20). 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 Program Controller.

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 command

sent to the Command Interface of the Program

Controller. When reading the Status Register they

report the status of the ongoing algorithm.

Data Inputs/Outputs (DQ8-DQ15). The Data In-

puts/Outputs output the data stored at the selected

address during a Bus Read operation. During Bus

Write operations the Command Interface does not

use these bits. When reading the Status Register

these bits should be ignored.

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

the memory, allowing Bus Read operations to be

performed. It also controls the Bus Write opera-

tions, when VPP is in the VHH range.

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

trols the Bus Read operations of the memory. It

also allows Bus Write operations, when VPP is in

the VHH range.

VCC Supply Voltage. The VCC Supply Voltage

supplies the power for Read operations.

A 0.1µF capacitor should be connected between

the VCC Supply Voltage pin and the VSS Ground

pin to decouple the current surges from the power

supply. The PCB track widths must be sufficient to

carry the currents required during program opera-

tions, ICC3.

VPP Program Supply Voltage. VPP is both a

power supply and Write Protect pin. The two func-

tions are selected by the voltage range applied to

the pin.

When the VPP is in the VHH range (see Table 10,

DC Characteristic, for the relevant values) the Pro-

gram operation is enabled. During such opera-

tions the VPP must be stable in the VHH range.

If the VPP is kept under the VHH range, particularly

in the voltage range 0 to 3.6V, any Program oper-

ation is disabled or stopped.

Note that VPP must not be left floating or uncon-

nected as the device may become unreliable.

Vss Ground. The VSS Ground is the reference

for all voltage measurements.

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