M28W320CB datasheet(15/42 Pages) STMICROELECTRONICS

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M28W320CT, M28W320CB

POWER CONSUMPTION

The M28W320C puts itself in one of four different

modes depending on the status of the control sig-

nals: Active Power, Automatic Stand-by, Stand-by

and Reset define decreasing levels of current con-

sumption. These allow the memory power to be

minimised, in turn decreasing the overall system

power consumption. As different recovery time are

linked to the different modes, please refer to the

AC timing Table to design your system.

Active Power

When E is at VIL and RP is at VIH, the device is in

active mode. Refer to DC Characteristics to get

the values of the current supply consumption.

Automatic Stand-by

Automatic Stand-by provides a low power con-

sumption state during read mode. Following a

read operation, after a delay close to the memory

access time, the device enters Automatic Stand-

by: the Supply Current is reduced to ICC1 values.

The device keeps the last output data stable, till a

new location is accessed.

Stand-by or Reset

Refer to the Device Operations section.

Power Up

The Supply voltage VDD and the Program Supply

voltage VPP can be applied in any order. The

memory Command Interface is reset on power up

to Read Memory Array, but a negative transition of

Chip Enable E or a change of the addresses is re-

quired to ensure valid data outputs. Care must be

taken to avoid writes to the memory when VDD is

above VLKO. Writes can be inhibited by driving ei-

ther E or W to VIH. The memory is disabled if RP

is at VIL.

Supply Rails

Normal precautions must be taken for supply volt-

age decoupling, each device in a system should

have the VDD and VPP rails decoupled with a

0.1

µF capacitor close to the VDD and VPP pins.The

PCB trace widths should be sufficient to carry the

required VPP program and erase currents.

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