tc59lm836dkb TOSHIBA Semiconductor CORPORATION, tc59lm836dkb Datasheet - Page 49
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tc59lm836dkb
Manufacturer Part Number
tc59lm836dkb
Description
288mbits Network Fcram2 ? 2,097,152-words ? 4 Banks ? 36-bits
Manufacturer
TOSHIBA Semiconductor CORPORATION
Datasheet
1.TC59LM836DKB.pdf
(65 pages)
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Part Number:
tc59lm836dkb30B
Manufacturer:
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Bank,Address
Bank,Address
AUTO-REFRESH TIMING (CL = 4, BL = 4)
Unidirectional DS/QS mode
Unidirectional DS/Free Running QS mode
Command
Command
(output)
(output)
(output)
(output)
CLK
CLK
CLK
CLK
CLK
DQ
DQ
QS
QS
WRA REF
Hi-Z
Hi-Z
Low
Note: In case of CL = 4, I
I
RCD
Bank,
Bank,
I
RDA
RDA
RCD
UA
UA
t
than Read / Write operation.
REFI
0
= 1 cycle
When the Auto-Refresh operation is performed, the synthetic average interval of Auto-Refresh
command specified by t
t
= 1 cycle
REFI
t
is specified to avoid partly concentrated current of Refresh operation that is activated larger area
1
t
REFI
LAL
LAL
LA
LA
is average interval time in 8 Refresh cycles that is sampled randomly.
1
WRA REF
=
Total time of 8 Refresh cycle
I
RC
I
RC
2
I
= 5 cycles
RAS
I
= 5 cycles
RAS
REFC
t
CL = 4
2
CL = 4
= 4 cycles
DESL
DESL
= 4 cycles
REFI
3
8
must be meet 19 clock cycles.
WRA REF
must be satisfied.
8 Refresh cycle
4
t
3
WRA
I
WRA
RCD
I
RCD
5
=
Q0 Q1 Q2 Q3
Q0 Q1 Q2 Q3
t
= 1 cycle
1
= 1 cycle
+ t
REF
REF
2
6
+ t
3
+ t
4
t
7
8
+ t
7
I
REFC
I
REFC
WRA REF
5
+ t
6
TC59LM836DKB-33,-40
= 19 cycles
n − 1
= 19 cycles
+ t
DESL
DESL
7
+ t
t
8
Low
Hi-Z
Hi-Z
8
n
2005-11-08 49/65
WRA REF
n + 1
WRA
WRA
RDA
RDA
or
or
MRS or
MRS or
LAL or
LAL or
n + 2
REF
REF
Rev 1.4
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