M28W320 STMicroelectronics, M28W320 Datasheet - Page 15

• Manufacturer Part Number: M28W320
• Description: 32 Mbit 2Mb x16/ Boot Block Low Voltage Flash Memory
• Manufacturer: STMicroelectronics

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 V
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.
IL
and RP is at V
IH
, the device is in
Stand-by or Reset
Refer to the Device Operations section.
Power Up
The Supply voltage V
voltage V
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 V
above V
ther E or W to V
is at V
Supply Rails
Normal precautions must be taken for supply volt-
age decoupling, each device in a system should
have the V
0.1 F capacitor close to the V
PCB trace widths should be sufficient to carry the
required V
IL
.
LKO
PP
PP
. Writes can be inhibited by driving ei-
DD
program and erase currents.
can be applied in any order. The
and V
IH
M28W320CT, M28W320CB
. The memory is disabled if RP
DD
PP
and the Program Supply
rails decoupled with a
DD
and V
PP
pins.The
DD
15/42
is