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K4C89093AF-GCF5 Datasheet

  • K4C89093AF-GCF5

  • 288Mb x18 Network-DRAM2 Specification

  • 55頁

  • SAMSUNG   SAMSUNG

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K4C89183AF
Auto-Refresh Timing (CL=4, BL=4)
Unidirectional DS/QS mode
0
1
2
3
4
5
6
7
n-1
n
n+1
n+2
CLK
CLK
l
RC
=5cycles
Command
RDA
LAL
DESL
WRA
REF
l
REFC
=19cycles
鈭?鈭?/div>
鈭?鈭?/div>
DESL
RDA
or
WRA
LAL or
MRS or
REF
Bank, Address
Bank,
UA
LA
l
RAS
=4cycles
l
RCD
=1cycle
l
RCD
=1cycle
QS
(output)
Low
Low
鈭?/div>
鈭?/div>
CL=4
DQ
(output)
Hi-Z
Q0 Q1 Q2 Q3
Hi-Z
鈭?/div>
鈭?/div>
Unidirectional DS/Free Running QS mode
CLK
CLK
l
RC
=5cycles
Command
RDA
LAL
DESL
WRA
REF
l
REFC
=19cycles
鈭?鈭?鈭?/div>
鈭?鈭?鈭?/div>
DESL
RDA
or
WRA
LAL or
MRS or
REF
Bank, Address
Bank,
UA
LA
l
RAS
=4cycles
l
RCD
=1cycles
l
RCD
=1cycles
QS
(output)
CL=4
DQ
(output)
Hi-Z
Q0 Q1 Q2 Q3
Hi-Z
Note : In case of CL=4, I
REFC
must be meet 19 clock cycles.
When the Auto-Refresh operation is perfomed, the synthetic average interval of Auto-Refresh command
specified by t
REFI
must be satisfied.
t
REFI
is average interval time in 8 Refresh cycles that is sampled randomly.
鈭?/div>
鈭?/div>
t
1
t
2
t
3
t
7
t
8
鈭?/div>
鈭?/div>
鈭?/div>
鈭?/div>
鈭?/div>
鈭?/div>
鈭?/div>
鈭?/div>
鈭?/div>
鈭?/div>
CLK
WRA REF
WRA REF
WRA REF
WRA REF
WRA REF
8 Refresh cycle
t
REFI
= Total time of 8 Refresh cycle = t
1
+t
2
+t
3
+t
4
+t
5
+t
6
+t
7
+t
8
8
8
t
REFI
is specified to avoid partly concentrated current of Refresh operation that is acivated
larger are than Read/Write operation.
- 47 -
REV. 0.7 Jan. 2005

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