M28W320CT09GB1T 데이터 시트보기 (PDF) - STMicroelectronics
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M28W320CT09GB1T Datasheet PDF : 42 Pages
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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
0.1µF capacitor close to the VDD and VPP pins.The
PCB trace widths should be sufficient to carry the
required VPP program and erase currents.
15/42
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