A29DL323 Series
Read Operation
Hardware Reset Pin
The device is reset to the read mode if VIL is input to the
for the duration of tRP and VIH for the duration of
The read operation is controlled by the
/CE is used to select a device, and the
output. The following three access times are used
depending on the condition.
and /OE. The
controls data
OE
OE
RESET
tRH. While VIL is being input to the
, all commands
RESET
are ignored, and the output pins go into a Hi-Z state. If the
voltage on is kept to GND ± 0.2 V at this time, the
-
-
-
Address access time (tACC): Time until valid data is
output after an address has been determined
RESET
current consumption can be lowered to 5mA or less. If VIH is
input to the , tREADY is required until data is output.
(however, after
).
CE
RESET
access time (tCE): Time until valid data is output
CE
For the timing waveform, refer to Timing Waveform for
Read Cycle (2).
after
has been determined (however, after
CE
address).
Output Disable Mode
access time (tOE): Time until valid data is output
OE
Output from the device is disabled (Hi-Z state) if VIH is input
after
has been determined (however,
must
CE
OE
OE
to the
.
OE
be input after tACC-tOE, tCE-tOE after address and
Sector Group Protection
have been determined).
On power-up, the device is automatically set in the read
mode. To read the device without changing address
immediately after power application, either execute
Protect the sector group by using a command.
control is no need.
or
WE
OE
hardware reset or briefly lower
For the timing waveform, refer to Timing Waveform for
Read Cycle (1).
to VIL from VIH.
CE
Temporary Sector Group Unprotect
Protection of a sector group can be temporarily canceled.
When VID is input to , the temporary sector group
RESET
Write Operation
unprotect mode is set. If a protected sector is selected in
this mode, it can be programmed or erased. If the mode is
canceled, the sector group is protected again.
For the timing waveform, refer to Timing Waveform for
Temporary Sector Group Unprotect.
The operation of the device is controlled by writing
commands to the registers. The command register is a
function that latches the address and data necessary for
executing an instruction and does not occupy the memory
area.
If an illegal address or data is written or if an address or
data is written in the wrong sequence, the device is reset to
the read mode.
Product ID
Read the product ID code by using a command.
Automatic Sleep Mode
Standby Mode
The automatic sleep mode is used to reduce the power
consumption substantially during a read operation.
If an address is held longer than the minimum read
cycle time (tRC), the sleep mode (low power
consumption mode) is automatically set. In this mode, the
output data is latched and continuously output.
The standby mode is set when VIH is input to the
current consumption in the standby mode can be lowered to
5 mA or less in two ways.
. The
CE
One is to use
and
. Input VCC ± 0.3 V to
CE
CE
However, while automatic programming or
erasing is being executed, the operating supply current
(ICC2) does not decrease to 5mA or lower even if
RESET
and
.
RESET
In the automatic sleep mode,
,
, and
do not
OE
CE WE
= VIH.
CE
If a read operation is executed in the standby mode, data is
output at access time.
have to be controlled. At this time, the current consumption
decreases to 5mA or less. During dual operation,
however, the current consumption is power supply
current (ICC6, ICC7).
CE
The other is to input GND ± 0.3 V to the
. At this
RESET
If the address is changed, the automatic sleep mode
is canceled automatically, the device returns to the
read mode, and the data of the newly input address is
output.
time, the level of
required for the device to return to the read mode from the
standby mode.
For the timing waveform, refer to Timing Waveform for
Read Cycle (2).
is VIH or VIL. In this case, tRH is
CE
PRELIMINARY
(May, 2002, Version 0.0)
6
AMIC Technology, Inc.
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