M59PW064 datasheet(7/24 Pages) STMICROELECTRONICS

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M59PW064

SIGNAL DESCRIPTIONS

See

Figure

2., Logic

Diagram,

and

Table

1., Signal Names, for a brief overview of the sig-

nals connected to this device.

Address Inputs (A0-A21). 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 Register 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 Characteristics, for the relevant values)

the Program/Erase operation is enabled. During

such operations the VPP must be stable in the VHH

range.

If the VPP is kept under the VHH range, particularly

in the voltage range 0V to 3.6V, any Program/

Erase operation 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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