AT49F040A(2003) 查看數據表（PDF） - Atmel Corporation

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AT49F040A
(Rev.:2003)

4-megabit (512K x 8) 5-volt Only Flash Memory

Atmel Corporation 

Program Cycle Characteristics

Symbol

tBP

tAS

tAH

tDS

tDH

tWP

tWPH

tEC

Parameter

Byte Programming Time

Address Set-up Time

Address Hold Time

Data Set-up Time

Data Hold Time

Write Pulse Width

Write Pulse Width High

Erase Cycle Time

Program Cycle Waveforms

Min

Typ

Max

Units

20

40

µs

0

ns

25

ns

20

ns

0

ns

20

ns

20

ns

6

7

seconds

8

Sector or Chip Erase Cycle Waveforms

8

Notes:

1. OE must be high only when WE and CE are both low.

2. For chip erase, the address should be 555. For sector erase, the address depends on what sector is to be erased.

(See note 4 under command definitions.)

3. For chip erase, the data should be 10H, and for sector erase, the data should be 30H.

10 AT49F040A

3359A–FLASH–6/03

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