AT49F040A ATMEL Corporation, AT49F040A Datasheet - Page 10

• Manufacturer Part Number: AT49F040A
• Description: 4-megabit (512K x 8) 5-volt Only Flash Memory
• Manufacturer: ATMEL Corporation

Program Cycle Characteristics
Program Cycle Waveforms
Sector or Chip Erase Cycle Waveforms
Notes:
10
Symbol
t
t
t
t
t
t
t
t
BP
AS
AH
DS
DH
WP
WPH
EC
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.
3. For chip erase, the data should be 10H, and for sector erase, the data should be 30H.
AT49F040A
(See note 4 under command definitions.)
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
8
8
Min
25
20
20
20
0
0
Typ
20
6
Max
40
7
3359B–FLASH–10/04
seconds
Units
µs
ns
ns
ns
ns
ns
ns