m28w640fcb STMicroelectronics, m28w640fcb Datasheet - Page 13

• Manufacturer Part Number: m28w640fcb
• Description: 64 Mbit 4mb X16, Boot Block 3v Supply Flash Memory
• Manufacturer: STMicroelectronics

M28W640FCT, M28W640FCB
2.7
2.8
2.9
2.10
2.11
Reset (RP)
The Reset input provides a hardware reset of the memory. When Reset is at V
memory is in reset mode: the outputs are high impedance and the current consumption is
minimized. After Reset all blocks are in the Locked state. When Reset is at V
in normal operation. Exiting reset mode the device enters read array mode, but a negative
transition of Chip Enable or a change of the address is required to ensure valid data outputs.
V
V
power supply for all operations (Read, Program and Erase).
V
V
independently from V
V
V
voltage range applied to the pin. The Supply Voltage V
V
If V
a voltage lower than V
V
values). V
after the operation has started does not have any effect on Program or Erase, however for
Double or Quadruple Word Program the results are uncertain.
If V
be stable until the Program/Erase algorithm is completed (see
V
V
Note: Each device in a system should have V
capacitor close to the pin. See
widths should be sufficient to carry the required V
DD
DDQ
PP
PP
PP
SS
DD
DDQ
PP
SS
PP
PP
is both a control input and a power supply pin. The two functions are selected by the
can be applied in any order.
> V
is the reference for all voltage measurements.
provides the power supply to the internal core of the memory device. It is the main
provides the power supply to the I/O pins and enables all Outputs to be powered
Program supply voltage
is in the range 11.4V to 12.6V it acts as a power supply pin. In this condition V
Ground
is kept in a low voltage range (0V to 3.6V) V
supply voltage
PP1
supply voltage
PP
enables these functions (see
is only sampled at the beginning of a program or erase; a change in its value
DD
PPLK
. V
DDQ
gives an absolute protection against program or erase, while
Figure 7: AC measurement load
can be tied to V
Table 15: DC
DD
DD
, V
PP
PP
or can use a separate supply.
DDQ
program and erase currents.
is seen as a control input. In this case
DD
and V
characteristics, for the relevant
and the Program Supply Voltage
PP
Table 17
circuit. The PCB track
decoupled with a 0.1µF
Signal descriptions
and
IH
Table
, the device is
IL
, the
18).
PP
must
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