Datasheet

Rev. 1.0 / Jun. 2013 27
AC & DC Input Measurement Levels
AC and DC Logic Input Levels for Single-Ended Signals
AC and DC Input Levels for Single-Ended Command and Address Signals
Notes:
1. For input only pins except RESET, Vref = VrefCA (DC).
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
RefCA(DC)
by more than +/-1% VDD (for refer-
ence: approx. +/- 15 mV).
4. For reference: approx. VDD/2 +/- 15 mV.
5. VIH(dc) is used as a simplified symbol for VIH.CA(DC100)
6. VIL(dc) is used as a simplified symbol for VIL.CA(DC100)
7. VIH(ac) is used as simplified symbol for VIH.CA(AC175), VIH.CA(AC150), VIH.CA(AC135), and VIH.CA(AC125);
VIH.CA(AC175) value is used when Vref + 0.175V is referenced, VIH.CA(AC150) value is used when Vref +
0.150V is referenced, VIH.CA(AC135) value is used when Vref + 0.135V is referenced, and VIH.CA(AC125) value
is used when Vref + 0.125V is referenced.
8. VIL(ac) is used as simplified symbol for VIL.CA(AC175), VIL.CA(AC150), VIL.CA(AC135), and VIL.CA(AC125);
VIL.CA(AC175) value is used when Vref - 0.175V is referenced, VIL.CA(AC150) value is used when Vref - 0.150V is
referenced, VIL.CA(AC135) value is used when Vref - 0.135V is referenced, and VIL.CA(AC125) value is used
when Vref - 0.125V is referenced.
Single Ended AC and DC Input Levels for Command and ADDress
Symbol Parameter
DDR3-800/1066/1333/1600 DDR3-1866
Unit Notes
Min Max Min Max
VIH.CA(DC100) DC input logic high Vref + 0.100 VDD Vref + 0.100 VDD V 1, 5
VIL.CA(DC100) DC input logic low VSS Vref - 0.100 VSS Vref - 0.100 V 1, 6
VIH.CA(AC175) AC input logic high Vref + 0.175 Note2 - - V 1, 2, 7
VIL.CA(AC175) AC input logic low Note2 Vref - 0.175 - - V 1, 2, 8
VIH.CA(AC150) AC Input logic high Vref + 0.150 Note2 - - V 1, 2, 7
VIL.CA(AC150) AC input logic low Note2 Vref - 0.150 - - V 1, 2, 8
VIH.CA(AC135) AC input logic high - - Vref + 0.135 Note2 V 1, 2, 7
VIL.CA(AC135) AC input logic low - - Note2 Vref - 0.135 V 1, 2, 8
VIH.CA(AC125) AC Input logic high - - Vref + 0.125 Note2 V 1, 2, 7
VIL.CA(AC125) AC input logic low - - Note2 Vref - 0.125 V 1, 2, 8
V
RefCA(DC
)
Reference Voltage for
ADD, CMD inputs
0.49 * VDD 0.51 * VDD 0.49 * VDD 0.51 * VDD V 3, 4