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A29DL323TV-90
(Rev.:2002)

32M-Bit CMOS Low Voltage Dual Operation Flash Memory 4M-Byte by 8-Bit (Byte Mode) / 2M-Word by 16-Bit (Word Mode)

AMIC Technology 

A29DL323 Series

Read Operation

The read operation is controlled by the OE and /OE. The

/CE is used to select a device, and the OE controls data

output. The following three access times are used

depending on the condition.

- Address access time (tACC): Time until valid data is

output after an address has been determined

(however, after CE ).

- CE access time (tCE): Time until valid data is output

after CE has been determined (however, after

address).

- OE access time (tOE): Time until valid data is output

after OE has been determined (however, OE must

be input after tACC-tOE, tCE-tOE after address and CE

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

hardware reset or briefly lower CE to VIL from VIH.

For the timing waveform, refer to Timing Waveform for

Read Cycle (1).

Write Operation

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.

Standby Mode

The standby mode is set when VIH is input to the CE . The

current consumption in the standby mode can be lowered to

5 µA or less in two ways.

One is to use CE and RESET . Input VCC ± 0.3 V to CE

and RESET . However, while automatic programming or

erasing is being executed, the operating supply current

(ICC2) does not decrease to 5µA or lower even if CE = VIH.

If a read operation is executed in the standby mode, data is

output at CE access time.

The other is to input GND ± 0.3 V to the RESET . At this

time, the level of CE is VIH or VIL. In this case, tRH is

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).

Hardware Reset Pin

The device is reset to the read mode if VIL is input to the

RESET for the duration of tRP and VIH for the duration of

tRH. While VIL is being input to the RESET , all commands

are ignored, and the output pins go into a Hi-Z state. If the

voltage on RESET is kept to GND ± 0.2 V at this time, the

current consumption can be lowered to 5µA or less. If VIH is

input to the RESET , tREADY is required until data is output.

For the timing waveform, refer to Timing Waveform for

Read Cycle (2).

Output Disable Mode

Output from the device is disabled (Hi-Z state) if VIH is input

to the OE .

Sector Group Protection

Protect the sector group by using a command. OE or WE

control is no need.

Temporary Sector Group Unprotect

Protection of a sector group can be temporarily canceled.

When VID is input to RESET , the temporary sector group

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.

Product ID

Read the product ID code by using a command.

Automatic Sleep 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.

In the automatic sleep mode, CE , WE , and OE do not

have to be controlled. At this time, the current consumption

decreases to 5µA or less. During dual operation,

however, the current consumption is power supply

current (ICC6, ICC7).

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.

PRELIMINARY (May, 2002, Version 0.0)

6

AMIC Technology, Inc.

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