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AS29F010

AustinSemiconductor,Inc.reservestherighttochangeproductsorspecificationswithoutnotice.

12

AS29F010

Rev. 2.3 12/08

Austin Semiconductor, Inc.

DQ3: Sector Erase Timer

After writing a sector erase command sequence, the

system may read DQ3 to determine whether or not an erase

operation has begun. (The sector erase timer does not apply to

the chip erase command.) If additional sectors are selected for

erasure, the entire time-out also applies after each additional

sector erase command. When the time-out is complete, DQ3

switches from “0” to “1.” The system may ignore DQ3 if the

system can guarantee that the time between additional sector

erase commands will always be less than 50µs. See also the

“Sector Erase Command Sequence” section.

After the sector erase command sequence is written, the

system should read the status on DQ7 (Data\ Polling) or DQ6

(Toggle Bit I) to ensure the device has accepted the command

sequence, and then read DQ3. If DQ3 is “1”, the internally

controlled erase cycle has begun; all further commands are

ignored until the erase operation is complete. If DQ3 is “0”, the

device will accept additional sector erase commands. To

ensure the command has been accepted, the system software

should check the status of DQ3 prior to and following each

subsequent sector erase command. If DQ3 is high on the

second status check, the last command might not have been

accepted. Table 5 shows the outputs for DQ3.

TABLE 5: WRITE OPERATION STATUS

NOTES:

1. DQ7 requires a valid address when reading status information. Refer to the appropriate subsection for further details.

2. DQ5 switches to ‘1’ when an Embedded Program or Embedded Erase operation has exceeded the maximum timing limits. See “DQ5:

Exceeding Timing Limits” for more information.

DQ7

1

DQ6

DQ5

2

DQ3

Embedded Program Algorithm

DQ7\

Toggle

0

N/A

Embedded Erase Algorithm

0

Toggle

0

1

Reading within Erase Suspended Sector

1

No toggle

0

N/A

Reading within Non-Erase Suspended Sector

Data

Data

Data

Data

Standard

Mode

Erase

Suspend

Mode

OPERATION

*Stresses greater than those listed under "Absolute Maximum Ratings"

may cause permanent damage to the device. This is a stress rating only

and functional operation of the device at these or any other conditions

above those indicated in the operation section of this specification is not

implied. Exposure to absolute maximum rating conditions for extended

periods may affect reliability.

ABSOLUTE MAXIMUM RATINGS*

Ambient Temperature with PowerApplied............-55°C to +125°C

Voltage with Respect to Ground

V

CC

A9

All other pins

Output Short Circuit Current

V

CC

Supply Voltage..................................................+4.50V to +5.50V

Storage Temperature..................................................-65°C to +125°C

NOTES:

1. Minimum DC voltage on input or I/O pin is -0.5V. During voltage transitions, input

may overshoot V

SS

to -2.0V for periods of up to 20ns. See Figure 5. Maximum DC voltage

on input and I/O pins is V

CC

+ 0.5V. During voltage transitions, input and I/O pins may

overshoot V

CC

+ 2.0V for periods up to 20ns. See Figure 6.

2. Minimum DC voltage on A9 pin is -0.5V. During voltage transitions, A9 pins may

overshoot V

SS

to -2.0V for periods of up to 20ns. See Figure 5. Maximum DC input

voltage on A9 is +12.5V which may overshoot to 14.0V for periods up to 20ns.

3. No more than one output shorted at a time. Duration of the short circuit should not be

greater than one second.

FIGURE 5: Maximum Negative

Overshoot Waveform

FIGURE 6: Maximum Positive

Overshoot Waveform