HYB18T512400BF Datasheet, PDF (27/57 Pages) Qimonda AG – 512-Mbit Double-Data-Rate-Two SDRAM

HYB18T512xxxBF–[2.5…5]
512-Mbit Double-Data-Rate-Two SDRAM
5.3
DC & AC Characteristics
DDR2 SDRAM pin timing are specified for either single
ended or differential mode depending on the setting of
the EMRS(1) “Enable DQS” mode bit; timing
advantages of differential mode are realized in system
design. The method by which the DDR2 SDRAM pin
timing are measured is mode dependent. In single
ended mode, timing relationships are measured
relative to the rising or falling edges of DQS crossing at
V_REF. In differential mode, these timing relationships
are measured relative to the crosspoint of DQS and its
complement, DQS. This distinction in timing methods is
verified by design and characterization but not subject
to production test. In single ended mode, the DQS (and
RDQS) signals are internally disabled and don’t care.
Table 24
Symbol
V_IH(dc)
V_IL(dc)
V_IH(ac)
V_IL(ac)
DC & AC Logic Input Levels for DDR2-667 and DDR2-800
Parameter
DDR2-667, DDR2-800
Min.
Max.
DC input logic high
DC input low
AC input logic high
AC input low
V_REF + 0.125
–0.3
V_REF + 0.200
—
V_DDQ + 0.3
V_REF – 0.125
—
V_REF – 0.200
Units
V
V
V
V
Table 25
Symbol
V_IH(dc)
V_IL(dc)
V_IH(ac)
V_IL(ac)
DC & AC Logic Input Levels for DDR2-533 and DDR2-400
Parameter
DDR2-533, DDR2-400
Min.
Max.
DC input logic high
DC input low
AC input logic high
AC input low
V_REF + 0.125
–0.3
V_REF + 0.250
—
V_DDQ + 0.3
V_REF - 0.125
—
V_REF - 0.250
Units
V
V
V
V
Table 26 Single-ended AC Input Test Conditions
Symbol
V_REF
V_SWING.MAX
SLEW
Condition
Input reference voltage
Input signal maximum peak to peak swing
Input signal minimum Slew Rate
Value
0.5 x V_DDQ
1.0
1.0
Unit
V
V
V / ns
Note
1)
—
2)3)
1) Input waveform timing is referenced to the input signal crossing through the V_REF level applied to the device under test.
2) The input signal minimum Slew Rate is to be maintained over the range from V_IH(ac).MIN to V_REF for rising edges and the
range from V_REF to V_IL(ac).MAX for falling edges as shown in Figure 4
3) AC timings are referenced with input waveforms switching from V_IL(ac) to V_IH(ac) on the positive transitions and V_IH(ac) to V_IL(ac)
on the negative transitions.
Internet Data Sheet
27
Rev. 1.05, 2007-01
03292006-YBYM-WG0Z