EDJ1104BBSE, EDJ1108BBSE, EDJ1116BBSE
[Single-ended levels for CK, DQS, DQSL, DQSU, /CK, /DQS, /DQSL or /DQSU]
Parameter
Symbol min.
typ.
max.
Unit
V
Notes
1, 2
3
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
(VDD/2) + 0.175
*
VSEH
VSEL
3
(VDD/2) + 0.175
*
V
1, 2
3
*
(VDD/2) − 0.175 V
(VDD/2) − 0.175 V
1, 2
3
*
1, 2
Notes: 1. For CK, /CK use VIH/VIL(AC) of ADD/CMD; for strobes (DQS, /DQS, DQSL, /DQSL, DQSU, /DQSU) use
VIH/VIL(AC) of DQs.
2. VIH(AC)/VIL(AC) for DQs is based on VREFDQ; VIH(AC)/VIL(AC) for address/command is based on
VREFCA; 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 signals 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.
To guarantee tight setup and hold times as well as output skew parameters with respect to clock and strobe, each
cross point voltage of differential input signals (CK, /CK and DQS, /DQS) must meet the requirements in table above.
The differential input cross point voltage VIX is measured from the actual cross point of true and complement signal
to the midlevel between of VDD and VSS.
VDD
CK, DQS
VIX
VDD/2
VIX
VIX
/CK, /DQS
VSS
VIX Definition
[Cross point voltage for differential input signals (CK, DQS)]
Parameter
Symbol
pins
min.
max.
150
Unit
mV
Note
1
Differential input cross point voltage
relative to VDD/2
VIX
CK, /CK
−150
−175
175
150
mV
mV
VIX
DQS, /DQS −150
Note: 1. Extended range for VIX is only allowed for clock and if CK and /CK are monotonic, have a single-ended
swing VSEL/VSEH of at least VDD/2 +/-250 mV, and the differential slew rate of CK - /CK is larger than 3
V/ ns. Refer to the table of Cross point voltage for differential input signals (CK, DQS) for VSEL and VSEH
standard values.
Data Sheet E1375E50 (Ver. 5.0)
19
ELPIDA [ ELPIDA MEMORY ]
