DC and ac parameters
M29W640GH, M29W640GL, M29W640GT, M29W640GB
Table 19. Write ac characteristics
M29W640GT, M29W640GB,
M29W640GH, M29W640GL
Symbol
Alt
Parameter
Unit
60
70
90
tAVAX
tELWL
tWLEL
tWLWH
tELEH
tWC
tCS
tWS
tWP
tCP
Address Valid to Next Address Valid
Chip Enable Low to Write Enable Low
Write Enable Low to Chip Enable Low
Write Enable Low to Write Enable High
Chip Enable Low to Chip Enable High
Min
Min
Min
Min
Min
60
0
70
0
90
0
ns
ns
ns
ns
ns
0
0
0
35
35
35
35
35
35
tDVWH
tDVEH
tWHDX
tEHDX
Input Valid to Write Enable or Chip Enable
High
tDS
Min
Min
30
0
30
0
30
0
ns
ns
Write Enable or Chip Enable High to Input
Transition
tDH
tWHEH
tEHWH
tWHWL
tCH
Write Enable High to Chip Enable High
Chip Enable High to Write Enable High
Min
Min
Min
0
0
0
0
0
0
ns
ns
ns
tWH
tWPH Write Enable High to Write Enable Low
tOEH Output Enable Hold time
25
25
25
tWHGL1
tEHGL1
Min
Min
Min
0
25
0
0
25
0
0
25
0
ns
ns
ns
tEHEL1
tCPH Chip Enable High to Chip Enable Low
tAVWL
tAVEL
tWLAX
tELAX
tGHWL
tGHEL
Address Valid to Write Enable or Chip Enable
Low
tAS
Write Enable or Chip Enable Low to Address
Transition
tAH
Min
45
45
45
ns
tGHWL Output Enable High to Write Enable Low
tGHEL Output Enable High to Chip Enable Low
Min
Min
0
0
0
0
0
0
ns
ns
(1)
tWHRL
tBUSY Program/Erase Valid to RB Low
tVCS VCC High to Chip Enable Low
Max
Min
0
0
0
ns
µs
tEHRL
tVCHEL
tVCHWL
50
50
50
1. Sampled only, not 100% tested.
52/90
NUMONYX [ NUMONYX B.V ]
