1Gb: x4, x8, x16 DDR3 SDRAM
Electrical Specifications – DC and AC
Table 27: Differential Input Operating Conditions (CK, CK# and DQS, DQS#)
Parameter/Condition
Symbol
VIH,diff
Min
200
Max
n/a
Unit Notes
Differential input voltage logic high - slew
Differential input voltage logic low - slew
Differential input voltage logic high
Differential input voltage logic low
mV
mV
mV
mV
mV
4
4
VIL,diff
n/a
–200
VIH,diff(AC)
VIL,diff(AC)
VIX
2 × (VIH(AC) - VREF
)
VDD/VDDQ
2 × (VIL(AC)-VREF
VREF(DC) + 150
5
VSS/VSSQ
)
6
Differential input crossing voltage relative
to VDD/2 for DQS, DQS#; CK, CK#
VREF(DC) - 150
4, 7
Differential input crossing voltage relative
to VDD/2 for CK, CK#
VIX (175)
VSEH
VREF(DC) - 175
VREF(DC) + 175
mV
4, 7, 8
Single-ended high level for strobes
Single-ended high level for CK, CK#
Single-ended low level for strobes
Single-ended low level for CK, CK#
VDDQ/2 + 175
VDD/2 + 175
VSSQ
VDDQ
VDD
mV
mV
mV
mV
5
5
6
6
VSEL
VDDQ/2 - 175
VDD/2 - 175
VSS
1. Clock is referenced to VDD and VSS. Data strobe is referenced to VDDQ and VSSQ
2. Reference is VREFCA(DC) for clock and VREFDQ(DC) for strobe.
3. Differential input slew rate = 2 V/ns
.
Notes:
4. Defines slew rate reference points, relative to input crossing voltages.
5. Minimum DC limit is relative to single-ended signals; overshoot specifications are appli-
cable.
6. Maximum DC limit is relative to single-ended signals; undershoot specifications are ap-
plicable.
7. The typical value of VIX(AC) is expected to be about 0.5 × VDD of the transmitting device,
and VIX(AC) is expected to track variations in VDD. VIX(AC) indicates the voltage at which
differential input signals must cross.
8. The VIX extended range ( 175mV) is allowed only for the clock; this VIX extended range
is only allowed when the following conditions are met: The single-ended input signals
are monotonic, have the single-ended swing VSEL, VSEH of at least VDD/2 250mV, and
the differential slew rate of CK, CK# is greater than 3 V/ns.
9. VIX must provide 25mV (single-ended) of the voltages separation.
PDF: 09005aef826aa906
1Gb_DDR3_SDRAM.pdf - Rev. L 03/13 EN
Micron Technology, Inc. reserves the right to change products or specifications without notice.
51
2006 Micron Technology, Inc. All rights reserved.
MICRON [ MICRON TECHNOLOGY ]
