MB81F641642D Fujitsu Microelectronics, MB81F641642D Datasheet - Page 29

• Manufacturer Part Number: MB81F641642D
• Description: 4 x 1M x 16-Bit SDRAM
• Manufacturer: Fujitsu Microelectronics

BASE VALUES FOR CLOCK COUNT/LATENCY
CLOCK COUNT FORMULA
RAS Cycle Time
RAS Precharge Time
RAS Active Time
RAS to CAS Delay Time
Write Recovery Time
RAS to RAS Bank Active Delay
Time
Data-in to Precharge Lead Time
Data-in to Active/
Refresh Command
Period
Mode Resister Set Cycle Time
Parameter
Clock
Notes
MB81F641642D-75/-102/-102L
*9
Clock Period
CL=2
CL=3
Base Value
Note *10
Symbol
t
t
t
t
t
t
t
t
DAL2
DAL3
t
t
RAS
RCD
RRD
RSC
DPL
WR
RP
RC
(Round off a whole number)
CL=3 CL=2
2 cyc
67.5
22.5
22.5
+ t
7.5
45
15
15
15
—
MB81F641642D
RP
Min.
1 cyc
+ t
70
20
50
20
10
20
10
—
20
-75
RP
110000
Max.
—
—
—
—
—
—
—
—
—
MB81F641642D
1 cyc
2 cyc
Min.
+ t
+ t
70
20
50
20
10
20
10
20
-102/-102L
RP
RP
110000
Max.
—
—
—
—
—
—
—
—
—
@66MHz(CL=2)
1 cyc
2 cyc
Min.
+ t
+ t
Preliminary (AE4.1E)
80
30
50
30
10
20
10
20
Reference
RP
RP
Value
110000
Max.
—
—
—
—
—
—
—
—
—
*4
Unit
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
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