EDJ1108BABG, EDJ1116BABG
4. tCL (avg) is defined as the average low pulse width, as calculated across any consecutive 200 low pulses.
N
tCL
(N × t
)
j
CK(avg)
Σ
j = 1
N = 200
5. 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}
6. 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.
7. tJIT (cc) is defined as the absolute difference in clock period between two consecutive clock cycles:
tJIT (cc) = Max. of {tCKj+1 - tCKj}
tJIT (cc) is defines the cycle when the DLL is already locked. tJIT (cc, lck) uses the same definition for
cycle-to-cycle jitter, during the DLL locking period only. tJIT (cc) and tJIT (cc, lck) are not subject to
production test.
8. tERR (nper) is defined as the cumulative error across n multiple consecutive cycles from tCK (avg).
tERR (nper) is not subject to production test.
9
n = from 13 cycles to 50 cycles. This row defines 38 parameters.
10. These parameters are specified per their average values, however it is understood that the following
relationship between the average timing and the absolute instantaneous timing hold at all times.
(minimum and maximum of spec values are to be used for calculations in the table below.)
Parameter
Symbol
min.
max.
Unit
Absolute clock period
tCK (abs) tCK (avg), min. + tJIT (per),min. tCK (avg), max. + tJIT (per),max. ps
Absolute clock high pulse
tCH (avg), min. × tCK (avg),min. tCH (avg), max. × tCK (avg),max.
tCH (abs)
tCL (abs)
ps
ps
width
+ tJIT (duty),min.
+ tJIT (duty),max.
Absolute clock low pulse
width
tCL (avg), min. × tCK (avg),min. tCL (avg), max. × tCK (avg),max.
+ tJIT (duty),min. + tJIT (duty),max.
11 tCH (abs) is the absolute instantaneous clock high pulse width, as measured from one rising edge to the
following falling edge.
12 tCL(abs) is the absolute instantaneous clock low pulse width, as measured from one falling edge to the
following rising edge.
Data Sheet E1248E40 (Ver. 4.0)
62
ELPIDA [ ELPIDA MEMORY ]
