HYB18T512400B2C Datasheet, PDF (48/69 Pages) Qimonda AG – 512-Mbit Double-Data-Rate-Two SDRAM

Internet Data Sheet
HY[B/I]18T512[40/80/16]0B2[C/F](L)
512-Mbit Double-Data-Rate-Two SDRAM
Parameter
Symbol
DDR2–667
Unit
Note^{1)2)3)4)5)6)7)}
Min.
Max.
Mode register set command cycle time
t_MRD
OCD drive mode output delay
t_OIT
DQ/DQS output hold time from DQS
t_QH
DQ hold skew factor
t_QHS
Average periodic refresh Interval
t_REFI
Auto-Refresh to Active/Auto-Refresh command t_RFC
period
2
—
0
12
t_HP – t_QHS
—
—
340
—
7.8
—
3.9
105
—
nCK
ns
ps
ps
µs
µs
ns
34)
25)
26)
27)28)
28)29)
30)
Precharge-All (4 banks) command period
Read preamble
Read postamble
Internal Read to Precharge command delay
Write preamble
Write postamble
Write recovery time
Internal write to read command delay
Exit power down to read command
Exit active power-down mode to read command
(slow exit, lower power)
t_RP
t_RPRE
t_RPST
t_RTP
t_WPRE
t_WPST
t_WR
t_WTR
t_XARD
t_XARDS
t_RP
—
0.9
1.1
0.4
0.6
7.5
—
0.35
—
0.4
0.6
15
—
7.5
—
2
—
7 – AL
—
ns
t_CK.AVG
t_CK.AVG
ns
t_CK.AVG
t_CK.AVG
ns
ns
nCK
nCK
31)32)
31)33)
34)
34)
34)35)
Exit precharge power-down to any valid
command (other than NOP or Deselect)
Exit self-refresh to a non-read command
Exit self-refresh to read command
Write command to DQS associated clock edges
t_XP
t_XSNR
t_XSRD
WL
2
—
t_RFC +10
—
200
—
RL–1
nCK
ns
34)
nCK
nCK
1) V_DDQ = 1.8 V ± 0.1V; V_DD = 1.8 V ± 0.1 V.
2) Timing that is not specified is illegal and after such an event, in order to guarantee proper operation, the DRAM must be powered down
and then restarted through the specified initialization sequence before normal operation can continue.
3) Timings are guaranteed with CK/CK differential Slew Rate of 2.0 V/ns. For DQS signals timings are guaranteed with a differential Slew
Rate of 2.0 V/ns in differential strobe mode and a Slew Rate of 1 V/ns in single ended mode.
4) The CK / CK input reference level (for timing reference to CK / CK) is the point at which CK and CK cross. The DQS / DQS, RDQS / RDQS,
input reference level is the crosspoint when in differential strobe mode. The input reference level for signals other than CK/CK, DQS/DQS,
RDQS / RDQS is defined.
5) Inputs are not recognized as valid until V_REF stabilizes. During the period before V_REF stabilizes, CKE = 0.2 x V_DDQ is recognized as low.
6) The output timing reference voltage level is V_TT.
7) New units, ‘t_CK.AVG‘ and ‘nCK‘, are introduced in DDR2–667 and DDR2–800. Unit ‘t_CK.AVG‘ represents the actual t_CK.AVG of the input clock
under operation. Unit ‘nCK‘ represents one clock cycle of the input clock, counting the actual clock edges. Note that in DDR2–400 and
DDR2–533, ‘t_CK‘ is used for both concepts. Example: t_XP = 2 [nCK] means; if Power Down exit is registered at Tm, an Active command
may be registered at Tm + 2, even if (Tm + 2 - Tm) is 2 x t_CK.AVG + t_{ERR.2PER(Min)}.
8) When the device is operated with input clock jitter, this parameter needs to be derated by the actual t_ERR(6-10per) of the input clock. (output
deratings are relative to the SDRAM input clock.) For example, if the measured jitter into a DDR2–667 SDRAM has t_{ERR(6-10PER).MIN} =
– 272 ps and t_{ERR(6- 10PER).MAX} = + 293 ps, then t_{DQSCK.MIN(DERATED)} = t_DQSCK.MIN – t_{ERR(6-10PER).MAX} = – 400 ps – 293 ps = – 693 ps and
t_{DQSCK.MAX(DERATED)} = t_DQSCK.MAX – t_{ERR(6-10PER).MIN} = 400 ps + 272 ps = + 672 ps. Similarly, t_LZ.DQ for DDR2–667 derates to t_{LZ.DQ.MIN(DERATED)}
= - 900 ps – 293 ps = – 1193 ps and t_{LZ.DQ.MAX(DERATED)} = 450 ps + 272 ps = + 722 ps. (Caution on the MIN/MAX usage!)
9) Input clock jitter spec parameter. These parameters and the ones in Chapter 7.3 are referred to as 'input clock jitter spec parameters' and
these parameters apply to DDR2–667 and DDR2–800 only. The jitter specified is a random jitter meeting a Gaussian distribution.
Rev. 1.12, 2007-05
48
10062006-YPTZ-CDR7