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AC Timing Operating Specifications
Table 11: AC Operating Specifications and Conditions
Not all speed grades listed may be supported for this device; refer to the title page for speeds supported; Notes: 1–5 apply to the entire table;
VDDQ = +1.8V ±0.1V, VDD = +1.8V ±0.1V
AC Characteristics
-187E
-25E
-25
-3E
-3
-37E
-5E
Units Notes
Parameter
Symbol
Min
Max
Min Max Min Max Min Max Min Max Min Max Min Max
Clock
cycle time
CL = 7 tCK (avg) 1.875
8.0
–
ns
CL = 6 tCK (avg)
2.5
8.0
2.5
8.0
2.5
8.0
–
CL = 5 tCK (avg)
3.0
8.0
2.5
8.0
3.0
8.0
3.0
8.0
3.0
8.0
–
CL = 4 tCK (avg) 3.75
8.0
3.75
8.0
3.75
8.0
3.0
8.0
3.75
8.0
3.75
8.0
5.0
8.0
CL = 3 tCK (avg)
5.0
8.0
5.0
8.0
5.0
8.0
5.0
8.0
5.0
8.0
5.0
8.0
5.0
8.0
CK high-level width tCH (avg) 0.48
0.52
0.48
0.52
0.48
0.52
0.48
0.52
0.48
0.52
0.48
0.52
0.48
0.52
tCK
CK low-level width tCL (avg)
0.48
0.52
0.48
0.52
0.48
0.52
0.48
0.52
0.48
0.52
0.48
0.52
0.48
0.52
tCK
Half clock period
tHP
MIN = lesser of tCH and tCL
MAX = n/a
ps
Absolute tCK
tCK (abs)
MIN = tCK (AVG) MIN + tJITper (MIN)
MAX = tCK (AVG) MAX + tJITper (MAX)
ps
Absolute CK
high-level width
tCH (abs)
MIN = tCK (AVG) MIN × tCH (AVG) MIN + tJITdty (MIN)
MAX = tCK (AVG) MAX × tCH (AVG) MAX + tJITdty (MAX)
ps
Absolute CK
low-level width
tCL (abs)
MIN = tCK (AVG) MIN × tCL (AVG) MIN + tJITdty (MIN)
MAX = tCK (AVG) MAX × tCL (AVG) MAX + tJITdty (MAX)
ps
1Gb:
x4,
x8,
x16
DDR2
SDRAM
AC
Timing
Operating
Specifications
PDF:
09005aef821ae8bf
1GbDDR2.pdf
–
Rev.
S
10/09
EN
31
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Technology,
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change
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without
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2004
Micron
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Inc.
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rights
reserved.