EBE10UE8AEFA Datasheet, PDF (24/30 Pages) Elpida Memory – 1GB Unbuffered DDR2 SDRAM DIMM

EBE10UE8AEFA
Clock Jitter
-8G
-6E
Frequency (Mbps)
800
667
Parameter
Symbol
min.
max.
min.
max.
Unit
Notes
Average clock period
tCK (avg) 2500
8000
3000
8000
ps
1
Clock period jitter
tJIT (per) −100
100
Clock period jitter during
DLL locking period
tJIT
(per, lck)
−80
80
Cycle to cycle period jitter
tJIT (cc)

200
Cycle to cycle clock period jitter
during DLL locking period
tJIT (cc, lck) 
160
Cumulative error across 2 cycles tERR (2per) −150
150
Cumulative error across 3 cycles tERR (3per) −175
175
−125
125
−100
100

250

200
−175
175
−225
225
ps
5
ps
5
ps
6
ps
6
ps
7
ps
7
Cumulative error across 4 cycles tERR (4per) −200
200
Cumulative error across 5 cycles tERR (5per) −200
200
Cumulative error across
n=6,7,8,9,10 cycles
Cumulative error across
n=11, 12,…49,50 cycles
tERR
(6-10per)
−300
300
tERR
(11-50per)
−450
450
Average high pulse width
tCH (avg) 0.48
0.52
−250
250
−250
250
−350
350
−450
450
0.48
0.52
ps
7
ps
7
ps
7
ps
7
tCK (avg) 2
Average low pulse width
tCL (avg) 0.48
0.52
0.48
0.52
tCK (avg) 3
Duty cycle jitter
tJIT (duty) −100
100
−125
125
ps
4
Notes: 1. tCK (avg) is calculated as the average clock period across any consecutive 200cycle window.
tCK (avg
)
=
∑^N
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.
tCH (avg
)
=
∑^N
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.
tCL(avg
)
=
∑^N
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) = {tCH_j- tCH (avg) where j = 1 to 200}
tJIT (CL) = {tCL_j − 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 { tCK_j − 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 E1295E40 (Ver. 4.0)
24