Internet Data Sheet
HY[B/I]25D256[16/40/80]0C[E/C/F/T](L)
256 Mbit Double-Data-Rate SDRAM
TABLE 19
AC Operating Conditions
Parameter
Symbol
Values
Unit Note1)/
Test
Min.
Max.
Condition
2)3)
Input High (Logic 1) Voltage, DQ, DQS and DM Signals
Input Low (Logic 0) Voltage, DQ, DQS and DM Signals
Input Differential Voltage, CK and CK Inputs
VIH(AC)
VIL(AC)
VID(AC)
VIX(AC)
V
REF + 0.31
—
V
V
V
V
2)3)
—
0.7
V
V
REF – 0.31
DDQ + 0.6
2)3)4)
2)3)5)
Input Closing Point Voltage, CK and CK Inputs
0.5 × VDDQ
–
0.5 × VDDQ+
0.2
0.2
1)
VDDQ = 2.5 V ± 0.2 V, VDD = +2.5 V ± 0.2 V (DDR200 - DDR333); VDDQ = 2.6 V ± 0.1 V, VDD = +2.6 V ± 0.1 V (DDR400); 0 °C ≤ TA ≤ 70 °C
2) Input slew rate = 1 V/ns.
3) Inputs are not recognized as valid until VREF stabilizes.
4)
VID is the magnitude of the difference between the input level on CK and the input level on CK.
5) The value of VIX is expected to equal 0.5 × VDDQ of the transmitting device and must track variations in the DC level of the same.
TABLE 20
AC Timing - Absolute Specifications for PC3200 and PC2700
Parameter
Symbol –5
–6
Unit Note/ Test
Condition1)
DDR400B
DDR333
Min.
Max.
Min.
Max.
2)3)4)5)
DQ output access time from
CK/CK
tAC
–0.5
+0.5
–0.7
+0.7
ns
2)3)4)5)
CK high-level width
Clock cycle time
tCH
tCK
0.45
0.55
8
0.45
6
0.55
12
tCK
5
ns
ns
ns
tCK
tCK
CL = 3.0 3)4)5)
CL = 2.5 2)3)4)5)
CL = 2.0 2)3)4)5)
2)3)4)5)
6
12
6
12
7.5
12
7.5
0.45
12
CK low-level width
tCL
0.45
0.55
0.55
2)3)4)5)6)
Auto precharge write recovery + tDAL
(tWR/tCK)+(tRP/tCK)
precharge time
2)3)4)5)
DQ and DM input hold time
tDH
0.4
—
—
0.45
1.75
—
—
ns
ns
2)3)4)5)6)
DQ and DM input pulse width
(each input)
tDIPW
1.75
2)3)4)5)
2)3)4)5)
DQS output access time from
CK/CK
tDQSCK
–0.6
0.35
—
+0.6
—
–0.6
0.35
—
+0.6
—
ns
tCK
ns
tCK
ns
DQS input low (high) pulse width tDQSL,H
(write cycle)
DQS-DQ skew (DQS and
associated DQ signals)
Write command to 1st DQS
latching transition
tDQSQ
tDQSS
tDS
+0.40
1.25
—
+0.40
1.25
—
TFBGA 2)3)4)5)
2)3)4)5)
0.72
0.4
0.75
0.45
2)3)4)5)
DQ and DM input setup time
Rev. 2.3, 2007-03
26
03062006-8CCM-VPUW
QIMONDA [ QIMONDA AG ]
