MK31VT464-10YE (98.07.24)
AC CHARACTERISTIC
(V = 3.3V ± 0.3V, Ta = 0 ~ 70°C)
cc
NOTE 1, 2
.
Parameter
Symbol
tCC
Module Spec.
Unit
Note
Min.
Max.
Clock Cycle Time
CL=3
10
-
ns
ns
CL=2
CL=3
CL=2
15
-
Access Time from Clock
tAC
-
9
ns
3, 4
3, 4
-
9
ns
Clock "H" Pulse Time
Clock "L" Pulse Time
Input Setup Time
Input Hold Time
tCH
tCL
3
-
ns
3
-
ns
tSI
3
-
ns
tHI
1
-
ns
Output Low Impedance Time from Clock
Output High Impedance Time from Clock
Output Hold from Clock
tOLZ
tOHZ
tOH
3
-
ns
-
8
ns
3
-
ns
3
/RAS Cycle Time
tRC
90
-
ns
/RAS Precharge Time
tRP
30
-
ns
/RAS Active Time
tRAS
tRCD
tWR
tRRD
tREF
tPDE
tT
60
1,000,000
ns
/RAS to /CAS Delay Time
30
-
-
ns
Write Recovery Time
15
ns
/RAS to /RAS Bank Active Delay Time
Refresh Time
20
-
ns
-
64
-
ms
ns
Power-down Exit Set-up Time
Input Level Transition Time
tSI+1CLK
-
3
ns
/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
ICCD
ICKE
IDOZ
IDOD
IDWD
1
1
2
0
0
Cycle
Cycle
Cycle
Cycle
Cycle
IROH
2
Cycle
Active Command Input Time from MODE
Write Command Input Time from Output
IMRD
3
2
Cycle
Cycle
IOWD
NOTES:
1) AC measurements assume tT=1ns.
2) The reference level for timing of input signals is 1.4V.
3) This parameter is measured with a load circuit equivalent to 1 TTL load and 50pF
(RLoad is 50ohm).
4) An access time is measured at 1.4V.
5) If tT is longer than 1ns, the reference level for timing of input signals are VIH and VIL.
1.4v
50
Ω
OUTPUT
OUTPUT LOAD
50pF
Page 8/11
OKI [ OKI ELECTRONIC COMPONETS ]
