HYB18T512400B Datasheet, PDF (58/68 Pages) Qimonda AG – 512-Mbit Double-Data-Rate-Two SDRAM

Internet Data Sheet
HYB18T512[40/80/16]0B[C/F]
512-Mbit Double-Data-Rate-Two SDRAM
The following parameters are specified per their average values however, it is understood that the following relationship
between the average timing and the absolute instantaneous timing holds all the time.
Symbol Parameter
Min.
TABLE 52
Absolute Jitter Value Definitions
Max.
Unit
t_CK.ABS Clock period
t t _CK.AVG(Min) + _JIT.PER(Min)
t t _CK.AVG(Max) + _JIT.PER(Max)
ps
t_CH.ABS Clock high-pulse width
t t t t t _CH.AVG(Min) x _CK.AVG(Min) + _{JIT.DUTY(Min) CH.AVG(Max)} x _CK.AVG(Max) +
ps
t_{JIT.DUTY(Max)}
t_CL.ABS Clock low-pulse width
t t t t t _CL.AVG(Min) x _CK.AVG(Min) + _{JIT.DUTY(Min) CL.AVG(Max)} x _CK.AVG(Max) +
ps
t_{JIT.DUTY(Max)}
Example: for DDR2-667, tCH.ABS(Min) = (0.48 x 3000ps) – 125 ps = 1315 ps = 0.438 x 3000 ps.
Table 53 shows clock-jitter specifications.
Symbol
t_CK.AVG
t_JIT.PER
t_JIT(PER,LCK)
t_JIT.CC
t_JIT(CC,LCK)
t_ERR.2PER
t_ERR.3PER
t_ERR.4PER
t_ERR.5PER
t_ERR(6-10PER)
t_{ERR(11-50PER)}
t_CH.AVG
t_CL.AVG
t_JIT.DUTY
Parameter
TABLE 53
Clock-Jitter Specifications for –667 and –800
DDR2 -667
DDR2 -800
Unit
Min.
Average clock period nominal w/o jitter
3000
Clock-period jitter
–125
Clock-period jitter during DLL locking period –100
Cycle-to-cycle clock-period jitter
–250
Cycle-to-cycle clock-period jitter during DLL- –200
locking period
Cumulative error across 2 cycles
–175
Cumulative error across 3 cycles
–225
Cumulative error across 4 cycles
–250
Cumulative error across 5 cycles
–250
Cumulative error across n cycles with n = 6 .. –350
10, inclusive
Cumulative error across n cycles with n = 11 .. –450
50, inclusive
Average high-pulse width
0.48
Average low-pulse width
0.48
Duty-cycle jitter
–125
Max.
8000
+125
+100
+250
+200
+175
+225
+250
+250
+350
+450
0.52
0.52
+125
Min.
2500
–100
–80
–200
–160
–150
–175
–200
–200
–300
–450
0.48
0.48
–100
Max.
8000
+100
+80
+200
+160
+150
+175
+200
+200
+300
+450
0.52
0.52
+100
ps
ps
ps
ps
ps
ps
ps
ps
ps
ps
ps
t_CK.AVG
t_CK.AVG
ps
Rev. 1.1, 2007-05
58
03292006-YBYM-WG0Z