EDJ8232B5MB datasheet(57/142 Pages) ELPIDA

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EDJ8232B5MB

Data Sheet E1825E30 (Ver. 3.0)

4. tCL (avg) is defined as the average low pulse width, as calculated across any consecutive 200 low pulses.

j = 1

tCL

tCK(avg))

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.

Absolute clock high pulse

width

tCH (abs)

tCH (avg)min.

 tCK (avg)min. +

tJIT (duty)min.

tCH (avg)max.

 tCK (avg)max.

+ tJIT (duty)max.

Absolute clock low pulse

width

tCL (abs)

tCL (avg)min.

 tCK (avg)min. +

tJIT (duty)min.

tCL (avg)max.

 tCK (avg)max.

+ 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.

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