M28W320 STMicroelectronics, M28W320 Datasheet - Page 6

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

M28W320CT, M28W320CB
SIGNAL DESCRIPTIONS
See Figure 1 and Table 1.
Address Inputs (A0-A20). The address signals
are inputs driven with CMOS voltage levels. They
are latched during a write operation.
Data Input/Output (DQ0-DQ15). The data in-
puts, a word to be programmed or a command to
the C.I., are latched on the Chip Enable E or Write
Enable W rising edge, whichever occurs first. The
data output from the memory Array, the Electronic
Signature, the block protection status or Status
Register is valid when Chip Enable E and Output
Enable G are active. The output is high impedance
when the chip is deselected, the outputs are dis-
abled or RP is tied to V
on DQ0-DQ7.
Chip Enable (E). The Chip Enable input acti-
vates the memory control logic, input buffers, de-
coders and sense amplifiers. E at V
the memory and reduces the power consumption
to the stand-by level. E can also be used to control
writing to the command register and to the memo-
ry array, while W remains at V
Output Enable (G). The Output Enable controls
the data Input/Output buffers.
Write Enable (W). This input controls writing to
the Command Register, Input Address and Data
latches.
Write Protect (WP). This input gives an addition-
al hardware protection level against program or
erase when pulled at V
Protection description.
Reset Input (RP). The RP input provides hard-
ware reset of the memory. When RP is at V
6/42
IL
IL
, as described in the Block
. Commands are issued
IL
.
IH
deselects
IL
, the
memory is in reset mode: the outputs are put to
High-Z and the current consumption is minimised.
When RP is at V
tion. Exiting reset mode the device enters read ar-
ray mode.
V
vides the power supply to the internal core of the
memory device. It is the main power supply for all
operations (Read, Program and Erase). It ranges
from 2.7V to 3.6V.
V
provides the power supply to the I/O pins and en-
ables all Outputs to be powered independently
from V
separate supply. It can be powered either from
1.65V to V
V
a control input and a power supply pin. The two
functions are selected by the voltage range ap-
plied to the pin.
If V
V
age lower than V
against program or erase, while V
ables these functions. V
at the beginning of a program or erase; a change
in its value after the operation has been started
does not have any effect and program or erase are
carried on regularly.
If V
a power supply pin. In this condition V
must be stable until P/E algorithm is completed
(see Table 24 and 25).
V
age measurements.
DD
DDQ
PP
PP
SS
PP
PP
Program Supply Voltage (12V). V
Ground. V
is seen as a control input. In this case a volt-
Supply Voltage (2.7V to 3.6V). V
Supply Voltage (1.65V to V
is used in the range 11.4V to 12.6V acts as
DD
is kept in a low voltage range (0V to 3.6V)
. V
DD
DDQ
.
SS
can be tied to V
PPLK
IH
, the device is in normal opera-
is the reference for all the volt-
gives an absolute protection
PP
value is only sampled
DD
DD
PP
or it can use a
). V
> V
DD
PP
PP
DDQ
PP1
is both
value
pro-
en-