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W9725G6KB25A Datasheet(HTML) 51 Page - Winbond

Part No. W9725G6KB25A
Description  DLL aligns DQ and DQS transitions with clock, Data masks (DM) for write data, Write Data Mask
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Maker  WINBOND [Winbond]
Homepage  http://www.winbond.com
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W9725G6KB25A Datasheet(HTML) 51 Page - Winbond

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W9725G6KB
Publication Release Date: Sep. 03, 2012
- 51 -
Revision A03
30. Input clock jitter spec parameter. These parameters and the ones in the table below are referred to as 'input clock jitter spec
parameters'. The jitter specified is a random jitter meeting a Gaussian distribution.
Input clock-Jitter specifications parameters for DDR2-667, DDR2-800 and DDR2-1066
PARAMETER
SYMBOL
DDR2-667
DDR2-800
DDR2-1066
UNIT
MIN.
MAX.
MIN.
MAX.
MIN.
MAX.
Clock period jitter
tJIT(per)
-125
125
-100
100
-90
90
pS
Clock period jitter during DLL locking period
tJIT(per,lck)
-100
100
-80
80
-80
80
pS
Cycle to cycle clock period
tJIT(cc)
-250
250
-200
200
-180
180
pS
Cycle to cycle clock period jitter during DLL
locking period
tJIT(cc,lck)
-200
200
-160
160
-160
160
pS
Cumulative error across 2 cycles
tERR(2per)
-175
175
-150
150
-132
132
pS
Cumulative error across 3 cycles
tERR(3per)
-225
225
-175
175
-157
157
pS
Cumulative error across 4 cycles
tERR(4per)
-250
250
-200
200
-175
175
pS
Cumulative error across 5 cycles
tERR(5per)
-250
250
-200
200
-188
188
pS
Cumulative error across n cycles,
n = 6 ... 10, inclusive
tERR(6-10per)
-350
350
-300
300
-250
250
pS
Cumulative error across n cycles,
n = 11 ... 50, inclusive
tERR(11-50per)
-450
450
-450
450
-425
425
pS
Duty cycle jitter
tJIT(duty)
-125
125
-100
100
-75
75
pS
Definitions:
-
tCK(avg)
tCK(avg) is calculated as the average clock period across any consecutive 200 cycle window.
tCK(avg) =
N
j
j
tCK
1
/ N
where
N = 200
-
tCH(avg) and tCL(avg)
tCH(avg) is defined as the average HIGH pulse width, as calculated across any consecutive 200 HIGH pulses.
tCH(avg) =
N
j
j
tCH
1
/ (N × tCK(avg))
where
N = 200
tCL(avg) is defined as the average LOW pulse width, as calculated across any consecutive 200 LOW pulses.
tCL(avg) =
N
j
j
tCL
1
/ (N × tCK(avg))
where
N = 200


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