M59PW1282 datasheet(7/24 Pages) STMICROELECTRONICS

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M59PW1282

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-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/Erase Con-

troller.

Address/Voltage Supply (A22/VPP). The

A22/VPP signal has two functions.

During read operations the A22/VPP signal works

as an address input, which is used to select the

Top (A22 = VIH) or Bottom (A22 = VIL) die.

During program or erase operations it also works

as a VPP voltage supply pin. At the beginning of

any program or erase operation, a specific proce-

dure (see Figure 4) must be performed to internal-

ly memorize the A22 value that will be used during

the program or erase operation.

When the VPP is in the VHH range (see Table 12,

DC Characteristic, for the relevant values) pro-

gram and erase operations are enabled. During

such operations VPP must be stable in the VHH

range. Program and erase operation are not al-

lowed when VPP is below the VHH range.

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/

Erase Controller. When reading the Status Regis-

ter 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.

Vss Ground. The VSS Ground is the reference

for all voltage measurements.

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