Hynix HMT42GR7BFR4C-RDT8 User Manual
Rev. 1.0 / May. 2014
28
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 43 and Table 51 in “ DDR3 Device
Operation”) as well as derating tables in Table 46 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 40.
3. The ac peak noise on V
2. Refer to "Overshoot and Undershoot Specifications" on page 40.
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)
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.
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); 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.
and VIL.DQ(AC135) value is used when Vref - 0.135V is referenced.
Single Ended AC and DC Input Levels for DQ and DM
Symbol
Parameter
DDR3-800/1066
DDR3-1333/1600
DDR3-1866
Unit Notes
Min
Max
Min
Max
Min
Max
VIH.DQ(DC100) DC input logic high Vref + 0.100
VDD
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
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
Vref + 0.150
Note2
V
1, 2, 7
VIL.DQ(AC150) AC input logic low
Note2
Vref - 0.150
Note2
Vref - 0.150
Note2
Vref - 0.150
V
1, 2, 8
VIH.CA(AC135) AC input logic high
-
-
-
-
Vref + 0.135
Note2
mV 1, 2, 7
VIL.CA(AC135) AC input logic low
-
-
-
-
Note2
Vref - 0.135 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 0.49 * VDD 0.51 * VDD
V
3, 4