MK31VT464-10YE (98.07.24)
AC CHARACTERISTIC
Parameter
Clock Cycle Time
Access Time from Clock
CL=3
CL=2
CL=3
CL=2
Symbol
t
CC
t
AC
t
CH
t
CL
t
SI
t
HI
t
OLZ
t
OHZ
t
OH
t
RC
t
RP
t
RAS
t
RCD
t
WR
t
RRD
t
REF
t
PDE
t
T
I
CCD
I
CKE
I
DOZ
I
DOD
I
DWD
I
ROH
I
MRD
I
OWD
(Vcc = 3.3V
±
0.3V, Ta = 0 ~ 70°C)
NOTE 1, 2
Module Spec.
Unit
Note
Min.
Max.
10
15
-
-
3
3
3
1
3
-
3
90
30
60
30
15
20
-
t
SI
+
1CLK
-
1
1
2
0
0
2
3
2
-
-
9
9
-
-
-
-
-
8
-
-
-
1,000,000
-
-
-
64
-
3
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ms
ns
ns
Cycle
Cycle
Cycle
Cycle
Cycle
Cycle
Cycle
Cycle
3
.
3, 4
3, 4
Clock "H" Pulse Time
Clock "L" Pulse Time
Input Setup Time
Input Hold Time
Output Low Impedance Time from Clock
Output High Impedance Time from Clock
Output Hold from Clock
/RAS Cycle Time
/RAS Precharge Time
/RAS Active Time
/RAS to /CAS Delay Time
Write Recovery Time
/RAS to /RAS Bank Active Delay Time
Refresh Time
Power-down Exit Set-up Time
Input Level Transition Time
/CAS to /CAS Delay Time (Min)
Clock Disable Time from CKE
Data Output High Impedance Time from
Data Input Mask Time from DQMB
Data Input Time from Write Command
Data Output High InpedanceTime from
Precharge Command
Active Command Input Time from MODE
Write Command Input Time from Output
NOTES:
1)
2)
3)
4)
5)
AC measurements assume t
T
=1ns.
The reference level for timing of input signals is 1.4V.
This parameter is measured with a load circuit equivalent to 1 TTL load and 50pF
(R
Load
is 50ohm).
An access time is measured at 1.4V.
If t
T
is longer than 1ns, the reference level for timing of input signals are V
IH
and V
IL
.
1.4v
50Ω
OUTPUT
OUTPUT LOAD
50pF
Page 8/11
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