EBE51RD8AJFA
Clock Jitter [DDR2-667]
-6E
Frequency (Mbps)
Parameter
667
Symbol
min.
3000
−125
max.
8000
125
Unit
ps
Notes
Average clock period
Clock period jitter
tCK (avg)
tJIT (per)
1
5
ps
Clock period jitter during
DLL locking period
tJIT
(per, lck)
−100
100
250
200
ps
ps
ps
5
6
6
Cycle to cycle period jitter
tJIT (cc)
Cycle to cycle clock period jitter during
DLL locking period
tJIT (cc, lck)
Cumulative error across 2 cycles
Cumulative error across 3 cycles
Cumulative error across 4 cycles
Cumulative error across 5 cycles
tERR (2per)
tERR (3per)
tERR (4per)
tERR (5per)
−175
−225
−250
−250
175
225
250
250
ps
ps
ps
ps
7
7
7
7
Cumulative error across
n=6,7,8,9,10 cycles
tERR
(6-10per)
−350
−450
350
450
ps
ps
7
7
Cumulative error across
n=11, 12,…49,50 cycles
tERR
(11-50per)
Average high pulse width
Average low pulse width
Duty cycle jitter
tCH (avg)
tCL (avg)
tJIT (duty)
0.48
0.48
−125
0.52
0.52
125
tCK (avg)
tCK (avg)
ps
2
3
4
Notes: 1. tCK (avg) is calculated as the average clock period across any consecutive 200cycle window.
N
tCK(avg) =
tCKj
N
∑
j =1
N = 200
2. tCH (avg) is defined as the average high pulse width, as calculated across any consecutive 200 high
pulses.
N
tCH(avg) =
tCHj (N ×tCK(avg))
∑
j =1
N = 200
3. tCL (avg) is defined as the average low pulse width, as calculated across any consecutive 200 low pulses.
N
tCL(avg) =
tCLj (N × tCK(avg))
∑
j =1
N = 200
4. tJIT (duty) is defined as the cumulative set of tCH jitter and tCL jitter. tCH jitter is the largest deviation of
any single tCH from tCH (avg). tCL jitter is the largest deviation of any single tCL from tCL (avg).
tJIT (duty) is not subject to production test.
tJIT (duty) = Min./Max. of {tJIT (CH), tJIT (CL)}, where:
tJIT (CH) = {tCHj- tCH (avg) where j = 1 to 200}
tJIT (CL) = {tCLj − tCL (avg) where j = 1 to 200}
5. tJIT (per) is defined as the largest deviation of any single tCK from tCK (avg).
tJIT (per) = Min./Max. of { tCKj − tCK (avg) where j = 1 to 200}
tJIT (per) defines the single period jitter when the DLL is already locked. tJIT (per, lck) uses the same
definition for single period jitter, during the DLL locking period only. tJIT (per) and tJIT (per, lck) are not
subject to production test.
Data Sheet E1036E30 (Ver. 3.0)
24
ELPIDA [ ELPIDA MEMORY ]
