Hynix HMT42GR7BMR4C-H9D2 Manuel D’Utilisation
Rev. 1.5 / Mar. 2012
31
AC and DC Input Levels for Single-Ended Signals
DDR3 SDRAM will support two Vih/Vil AC levels for DDR3-800 and DDR3-1066
as specified in the table
below. DDR3 SDRAM will also support corresponding tDS values (Table 41 and Table 47 in “ DDR3 Device
Operation”) as well as derating tables in Table 44 of “DDR3 Device Operation” depending on Vih/Vil AC lev-
els.
els.
Notes:
1. Vref = VrefDQ (DC).
2. Refer to "Overshoot and Undershoot Specifications" on page 43.
3. The ac peak noise on V
1. Vref = VrefDQ (DC).
2. Refer to "Overshoot and Undershoot Specifications" on page 43.
3. The ac peak noise on V
Ref
may not allow V
Ref
to deviate from V
RefDQ(DC)
by more than +/-1% VDD (for
reference: approx. +/- 15 mV).
4. For reference: approx. VDD/2 +/- 15 mV.
5. VIH(dc) is used as a simplified symbol for VIH.DQ(DC100)
6. VIL(dc) is used as a simplified symbol for VIL.DQ(DC100)
7. VIH(ac) is used as simplified symbol for VIH.DQ(AC175), VIH.DQ(AC150), and VIH.DQ(AC135);
4. For reference: approx. VDD/2 +/- 15 mV.
5. VIH(dc) is used as a simplified symbol for VIH.DQ(DC100)
6. VIL(dc) is used as a simplified symbol for VIL.DQ(DC100)
7. VIH(ac) is used as simplified symbol for VIH.DQ(AC175), VIH.DQ(AC150), and VIH.DQ(AC135);
VIH.DQ(AC175) value is used when Vref + 0.175V is referenced, VIH.DQ(AC150) value is used when Vref
+ 0.150V is referenced, and VIH.DQ(AC135) value is used when Vref + 0.135V is referenced.
8. VIL(ac) is used as simplified symbol for VIL.DQ(AC175), VIL.DQ(AC150), and VIL.DQ(AC135);
8. VIL(ac) is used as simplified symbol for VIL.DQ(AC175), VIL.DQ(AC150), and VIL.DQ(AC135);
VIL.DQ(AC175) value is used when Vref - 0.175V is referenced, VIL.DQ(AC150) value is used when Vref -
0.150V is referenced, and VIL.DQ(AC135) value is used when Vref - 0.135V is referenced.
9. Vref is measured relative to VDD at the same point, time and same device.
9. Vref is measured relative to VDD at the same point, time and same device.
Single Ended AC and DC Input Levels for DQ and DM
Symbol
Parameter
DDR3-800/1066
DDR3-1333/1600
Unit Notes
Min
Max
Min
Max
VIH.DQ(DC100) DC input logic high
Vref + 0.100
VDD
Vref + 0.100
VDD
V
1, 5
VIL.DQ(DC100) DC input logic low
VSS
Vref - 0.100
VSS
Vref - 0.100
V
1, 6
VIH.DQ(AC175) AC input logic high
Vref + 0.175
Note2
-
-
V
1, 2, 7
VIL.DQ(AC175) AC input logic low
Note2
Vref - 0.175
-
-
V
1, 2, 8
VIH.DQ(AC150) AC Input logic high
Vref + 0.150
Note2
Vref + 0.150
Note2
V
1, 2, 7
VIL.DQ(AC150) AC input logic low
Note2
Vref - 0.150
Note2
Vref - 0.150
V
1, 2, 8
VIH.CA(AC135) AC input logic high
-
-
-
-
mV 1, 2, 7
VIL.CA(AC135) AC input logic low
-
-
-
-
mV 1, 2, 8
V
RefDQ(DC
)
Reference Voltage
for DQ, DM inputs
0.49 * VDD
0.51 * VDD
0.49 * VDD
0.51 * VDD
V
3, 4, 9