m27w032 STMicroelectronics, m27w032 Datasheet - Page 6

• Manufacturer Part Number: m27w032
• Manufacturer: STMicroelectronics

M27W032
SIGNAL DESCRIPTIONS
See Figure 2, Logic Diagram, and Table 1, Signal
Names, for a brief overview of the signals connect-
ed to this device.
Address Inputs (A0-A20). The Address Inputs
select the cells in the memory array to access dur-
ing Bus Read operations. During Bus Write opera-
tions they control the commands sent to the
Command Interface of the Program Controller.
Data Inputs/Outputs (DQ0-DQ7). The Data In-
puts/Outputs output the data stored at the selected
address during a Bus Read operation. During Bus
Write operations they represent the command
sent to the Command Interface of the Program
Controller. When reading the Status Register they
report the status of the ongoing algorithm.
Data Inputs/Outputs (DQ8-DQ15). The Data In-
puts/Outputs output the data stored at the selected
address during a Bus Read operation. During Bus
Write operations the Command Interface does not
use these bits. When reading the Status Register
these bits should be ignored.
Chip Enable (E). The Chip Enable, E, activates
the memory, allowing Bus Read operations to be
performed. It also controls the Bus Write opera-
tions, when V
Output Enable (G). The Output Enable, G, con-
trols the Bus Read operations of the memory. It
6/23
PP
is in the V
HH
range.
also allows Bus Write operations, when V
the V
V
supplies the power for Read operations.
A 0.1µF capacitor should be connected between
the V
pin to decouple the current surges from the power
supply. The PCB track widths must be sufficient to
carry the currents required during program opera-
tions, I
V
power supply and Write Protect pin. The two func-
tions are selected by the voltage range applied to
the pin.
When the V
DC Characteristic, for the relevant values) the Pro-
gram operation is enabled. During such opera-
tions the V
If the V
in the voltage range 0 to 3.6V, any Program oper-
ation is disabled or stopped.
Note that V
nected as the device may become unreliable.
Vss Ground. The V
for all voltage measurements.
CC
PP
Supply Voltage. The V
Program Supply Voltage. V
HH
CC
CC3
PP
range.
Supply Voltage pin and the V
is kept under the V
.
PP
PP
PP
must be stable in the V
must not be left floating or uncon-
is in the V
SS
Ground is the reference
HH
range (see Table 10,
HH
CC
range, particularly
Supply Voltage
PP
HH
SS
is both a
range.
Ground
PP
is in