ISSUE 4.2 : November 1998
MFM8126S - 70/90/12
AC Operating Conditions
Read
Parameter
Read Cycle Time
Address to output delay
Chip Select to output
Output Enable to output
Chip Select to O/P High Z
Output Enable to output High Z
Output hold time
(From address,
CS or OE whichever occurs first)
Symbol
t
RC
t
AC
-70
min
max
70
-
-
-
-90
min
90
-
-
-
-
-
0
max
-
90
90
35
20
20
-
min
120
-
-
-
-
-
0
-12
max
-
120
120
50
30
30
-
unit
ns
ns
ns
ns
ns
ns
ns
-
70
70
30
20
20
-
t
CE
t
OE
t
DF
-
-
t
DF
t
OH
0
Write/ Erase/ Program
-70
Parameter
Write Cycle time
Address Setup time
Address Hold time
Data Setup Time
Data hold Time
Output Enable Setup Time
Output Enable Hold Time
Read Recover before Write
CS setup time
CS hold time
Write Pulse Width
Write Pulse Width High
Programming operation
Erase operation
(1)
Vcc setup time
(4)
Voltage Transition Time
(2,4)
Write Pulse Width
(2)
OE Setup time to WE active
(2,4)
CS Setup time to WE active
(3,4)
Notes:
(1)
(2)
(3)
(4)
Symbol
t
WC
t
AS
t
AH
t
DS
t
DH
t
OES
t
OEH
t
GHWL
t
CS
t
CH
t
WP
t
WPH
t
WHWH1
t
WHWH2
t
VCS
t
VLHT
t
WPP
t
OESP
t
CSP
min
70
0
45
30
0
0
0
0
0
0
35
20
14
3
50
4
10
4
4
max
-
-
-
-
-
-
-
-
-
-
-
-
-
60
-
-
-
-
-
min
90
0
45
40
0
0
0
0
0
0
40
20
14
3
50
4
10
4
4
-90
max
-
-
-
-
-
-
-
-
-
-
-
-
-
60
-
-
-
-
-
min
120
0
50
50
0
0
0
0
0
0
50
20
14
3
50
4
10
4
4
-12
max
-
-
-
-
-
-
-
-
-
-
-
-
-
60
-
-
-
-
-
unit
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
µs
s
µs
ns
ns
ns
ns
This also includes the preprogramming time.
These timings are for Sector Protect/Unprotect operations.
This timing is only for Sector Unprotect.
Not 100% tested.
4
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