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MSC23S4721E Datasheet PDF : 11 Pages
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MSC23S4721E-8BS18 (98.07.17)
AC CHARACTERISTIC
(VCC = 3.3 ± 0.3V, Ta = 0 ~70°C)
Parameter
Symbol
NOTE 1, 2
.
Module Spec.
Unit Note
Min.
Max.
Clock Cycle Time
CL=3
CL=2
tCC
8
-
ns
12
-
ns
Access Time from Clock
CL=3
tAC
-
6
ns 3, 4
CL=2
-
10
ns 3, 4
Clock "H" Pulse Time
tCH
3
-
ns
Clock "L" Pulse Time
tCL
3
-
ns
Input Setup Time(CLK, ADD, DIN)
tSI
2
-
ns
Input Hold Time(CLK, ADD, DIN)
tHI
1
-
ns
Output Low Impedance Time from Clock
tOLZ
3
-
ns
Output High Impedance Time from Clock
tOHZ
-
9
ns
Output Hold from Clock
tOH
3
-
ns
/RAS Cycle Time
tRC
70
-
ns
/RAS Precharge Time
tRP
20
-
ns
/RAS Active Time
/RAS to /CAS Delay Time
Write Recovery Time
tRAS
tRCD
tW R
48
100,000 ns
20
-
ns
8
-
ns
Write Command Input Time from Output
tOW D
20
-
ns
/RAS to /RAS Bank Active Delay Time
tRRD
20
-
ns
Refresh Time
Power-down Exit Set-up Time
Input Level Transition Time
/CAS to /CAS Delay Time (Min)
tREF
tPDE
tT
ICCD
-
64
ms
10
-
ns
-
3
ns
1
Cycle
Clock Disable Time from CKE
ICKE
1
Cycle
Data Output High Impedance Time from DQM
IDOZ
2
Cycle
Data Input Mask Time from DQMB
Data Input Time from Write Command
Data Output High Inpedance Time
IDOD
IDW D
IROH
0
Cycle
0
Cycle
CL
Cycle
Active Command Input Time from MODE
IMRD
3
Cycle
NOTES:
1)
2)
3)
4)
5)
AC measurements assume that tT=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
(RLoad is 50ohm).
An access time is measured at 1.4V.
If tT is longer than 1ns, the reference level for timing of input signals are VIH and VIL.
OUTPUT
OUTPUT LOAD
1.4v
50Ω
50pF
Page 8/11
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