EDJ1108BABG, EDJ1116BABG
AC and DC Logic Input Levels for Differential Signals
Differential signal definition
Definition of Differential AC-swing and “time above AC-level” tDVAC
[Differential AC and DC Input Levels]
Parameter
Symbol
VIHdiff
VILdiff
min.
typ.
max.
Unit
V
Notes
3
Differential input logic high
Differential input logic low
Differential input logic AC
Differential input logic AC
+0.200
*
1
1
2
2
3
*
–0.200
V
3
VIHdiff (AC) 2 × (VIH (AC) − VREF)
*
V
3
VILdiff (AC)
*
2 × (VREF − VIL(AC))
V
Notes: 1 Used to define a differential signal slew-rate.
2. For CK, /CK use VIH/VIL(AC) of address/command and VREFCA; for strobes (DQS, /DQS, DQSL,
/DQSL, DQSU, /DQSU) use VIH/VIL(AC) of DQs and VREFDQ; if a reduced ac-high or ac-low level is
used for a signal group, then the reduced level applies also here.
3
These values are not defined, however the single ended components of differential signal CK, /CK, DQS,
/DQS, DQSL, /DQSL, DQSU, /DQSU need to be within the respective limits (VIH(DC) max, VIL(DC)min)
for single-ended signals as well as the limitations for overshoot and undershoot. Refer to Overshoot and
Undershoot specifications.
Data Sheet E1248E40 (Ver. 4.0)
16
ELPIDA [ ELPIDA MEMORY ]
