hys64t128020emv-2.5c2 Qimonda, hys64t128020emv-2.5c2 Datasheet - Page 18

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hys64t128020emv-2.5c2

Manufacturer Part Number
hys64t128020emv-2.5c2
Description
214-pin 1.5v Unbuffered Ddr2 Sdram Microdimm Modules Mdimm Sdram
Manufacturer
Qimonda
Datasheet
7) New units, ‘
8) When the device is operated with input clock jitter, this parameter needs to be derated by the actual
9) Input clock jitter spec parameter. The jitter specified is a random jitter meeting a Gaussian distribution.
10) These parameters are specified per their average values.
11)
12) DAL = WR + RU{
13)
14) Input waveform timing
15)
16) These parameters are measured from a data strobe signal ((L/U/R)DQS / DQS) crossing to its respective clock signal (CK / CK) crossing.
17) Input waveform timing
18) If
19) These parameters are measured from a data signal ((L/U)DM, (L/U)DQ0, (L/U)DQ1, etc.) transition edge to its respective data strobe signal
20)
21)
22) input waveform timing is referenced from the input signal crossing at the
23) Input waveform timing is referenced from the input signal crossing at the
24) These parameters are measured from a command/address signal (CKE, CS, RAS, CAS, WE, ODT, BA0, A0, A1, etc.) transition edge to
25)
26)
27) The Auto-Refresh command interval has be reduced to 3.9 µs when operating the DDR2 DRAM in a temperature range between 85 °C
28) 0 °C≤
Rev. 1.00, 2008-06
01242008-CDK4-KSK6
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, ‘
may be registered at Tm + 2, even if (Tm + 2 - Tm) is 2 x
deratings are relative to the SDRAM input clock.) For example, if the measured jitter into a DDR2–667 SDRAM has
ps and
t
= - 900 ps – 293 ps = – 1193 ps and
t
entire time it takes to achieve the 3 clocks of registration. Thus, after any CKE transition, CKE may not transition from its valid level during
the time period of
of the division is not already an integer, round up to the next highest integer.
DDR2–533 at
t
the input signal crossing at the
at the
V
t
slew rate mismatch between DQS / DQS and associated DQ in any given cycle.
The spec values are not affected by the amount of clock jitter applied (i.e.
crossing. That is, these parameters should be met whether clock jitter is present or not.
to the differential data strobe crosspoint for a rising signal, and from the input signal crossing at the
crosspoint for a falling signal applied to the device under test. DQS, DQS signals must be monotonic between
Figure
((L/U/R)DQS / DQS) crossing.
t
It is used in conjunction with t
following equation;
minimum of the actual instantaneous clock low time.
t
which specifies when the device output is no longer driving (
to the device under test. See
to the device under test. See
its respective clock signal (CK / CK) crossing. The spec values are not affected by the amount of clock jitter applied (i.e.
etc.), as the setup and hold are relative to the clock signal crossing that latches the command/address. That is, these parameters should
be met whether clock jitter is present or not.
t
the max column. {The less half-pulse width distortion present, the larger the
Examples: 1) If the system provides
provides
t
transferred to the output; and 2) The worst case push-out of DQS on one transition followed by the worst case pull-in of DQ on the next
transition, both of which are independent of each other, due to data pin skew, output pattern effects, and pchannel to n-channel variation
of the output drivers.
and 95 °C.
DQSCK.MAX(DERATED)
CKE.MIN
DAL.nCK
DQSQ
HP
HZ
QH
QHS
IH.DC.MIN
t
DS
and
is the minimum of the absolute half period of the actual input clock.
=
accounts for: 1) The pulse duration distortion of on-chip clock circuits, which represents how well the actual
: Consists of data pin skew and output pattern effects, and p-channel to n-channel variation of the output drivers as well as output
or
t
V
T
HP
t
3.
of 3 clocks means CKE must be registered on three consecutive positive clock edges. CKE must remain at the valid input level the
= WR [nCK] +
t
IL.DC
CASE
t
ERR(6- 10PER).MAX
LZ
DH
. See
t
HP
transitions occur in the same access time as valid data transitions. These parameters are referenced to a specific voltage level
t
t
is violated, data corruption may occur and the data must be re-written with valid data before a valid READ can be executed.
QHS
CK.AVG
level for a rising signal applied to the device under test. DQS, DQS signals must be monotonic between
of 1420 ps into a DDR2–667 SDRAM, the DRAM provides
≤ 85 °C.
t
CK
t
CK
Figure
, where:
‘ is used for both concepts. Example:
t
RP
= 3.75 ns with
t
‘ and ‘nCK‘, are introduced in DDR2–667 and DDR2–800. Unit ‘
=
IS
t
(ns) /
HP
t
+ 2 x
DQSCK.MAX
t
t
t
3.
= MIN (
nRP.nCK
DS
= + 293 ps, then
DH
t
HP
t
with differential data strobe enabled MR[bit10] = 0, is referenced from the input signal crossing at the
CK
with differential data strobe enabled MR[bit10] = 0, is referenced from the differential data strobe crosspoint to
t
CK
is the minimum of the absolute half period of the actual input clock; and
(ns)}, where RU stands for round up. WR refers to the tWR parameter stored in the MRS. For
QHS
Figure
Figure
+
= WR + RU{
t
V
CH.ABS
t
t
IH
IH.DC
t
WR
to derive the DRAM output timing
ERR(6-10PER).MIN
.
t
programmed to 4 clocks.
HP
,
t
4.
4.
LZ.DQ.MAX(DERATED)
level for a falling signal and from the differential data strobe crosspoint to the input signal crossing
t
CL.ABS
of 1315 ps into a DDR2–667 SDRAM, the DRAM provides
t
DQSCK.MIN(DERATED)
t
RP
), where,
[ps] /
= 400 ps + 272 ps = + 672 ps. Similarly,
t
CK.AVG
t
t
XP
CH.ABS
= 450 ps + 272 ps = + 722 ps. (Caution on the MIN/MAX usage!)
= 2 [nCK] means; if Power Down exit is registered at Tm, an Active command
t
CK.AVG
[ps] }, where WR is the value programmed in the EMR.
=
t
t
is the minimum of the actual instantaneous clock high time;
HZ
DQSCK.MIN
t
DAL
), or begins driving (
+
18
= 4 + (15 ns / 3.75 ns) clocks = 4 + (4) clocks = 8 clocks.
t
ERR.2PER(Min)
t
QH
t
. The value to be used for
HP
V
V
t
QH
t
IL.DC
IH.AC
ERR(6-10PER).MAX
t
is an input parameter but not an input specification parameter.
JIT.PER
of 1080 ps minimum.
Unbuffered DDR2 SDRAM MicroDIMM Modules
t
t
QH
CK
level for a rising signal and
level for a rising signal and
.
value is; and the larger the valid data eye will be.}
refers to the application clock period. Example: For
,
t
t
CK.AVG
JIT.CC
t
LZ
) .
, etc.), as these are relative to the clock signal
t
‘ represents the actual
LZ.DQ
= – 400 ps – 293 ps = – 693 ps and
HYS64T128020EMV–[2.5/3S](–)C2
for DDR2–667 derates to
V
t
t
QH
QH
IL.AC
t
t
QHS
ERR(6-10per)
calculation is determined by the
of 975 ps minimum. 2) If the system
level to the differential data strobe
is the specification value under
V
V
IH.DC
IL.AC
V
il(DC)MAX
of the input clock. (output
for a falling signal applied
for a falling signal applied
t
Internet Data Sheet
CK.AVG
t
HP
t
ERR(6-10PER).MIN
at the input is
V
and
IL.DC.MAX
of the input clock
t
LZ.DQ.MIN(DERATED)
t
t
t
JIT.PER
RP
CL.ABS
V
ih(DC)MIN
, if the result
V
and
IH.AC
,
is the
t
= – 272
JIT.CC
. See
level
,

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