21
3631A–FLASH–04/06
AT49BV642D(T)
21. Program Cycle Waveforms
22. Sector or Chip Erase Cycle Waveforms
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 3 under “Command Definition Table” on page 11.)
3. For chip erase, the data should be 10H, and for sector erase, the data should be 30H.
20. Program Cycle Characteristics
Symbol Parameter Min Typ Max Units
t
BP
Word Programming Time 10 120 µs
t
BPD
Word Programming Time in Dual Programming Mode 5 60 µs
t
AS
Address Setup Time 0 ns
t
AH
Address Hold Time 25 ns
t
DS
Data Setup Time 25 ns
t
DH
Data Hold Time 0 ns
t
WP
Write Pulse Width 25 ns
t
WPH
Write Pulse Width High 15 ns
t
WC
Write Cycle Time 70 ns
t
RP
Reset Pulse Width 500 ns
t
EC
Chip Erase Cycle Time 64 seconds
t
SEC1
Sector Erase Cycle Time (4K Word Sectors) 0.1 2.0 seconds
t
SEC2
Sector Erase Cycle Time (32K Word Sectors) 0.5 6.0 seconds
t
ES
Erase Suspend Time 15 µs
t
PS
Program Suspend Time 10 µs
OE
PROGRAM CYCLE
INPUT
DA TA
ADDRESS
A0
55
555 555
AA
AAA
t
BP
t
WPH
t
WP
CE
WE
A0 - A21
DA TA
t
AS
t
AH
t
DH
t
DS
555
AA
t
WC
OE
(1)
AA
80
Note 3
55 55
555
555
Note 2
AA
WORD 0
WORD 1 WORD 2
WORD 3
WORD 4
WORD 5
AAA AAA
t
WPH
t
WP
CE
WE
A0-A21
DA TA
t
AS
t
AH
t
EC
t
DH
t
DS
555
t
WC
