AS4C256M16D3
- Slew Rate Definition for Differential Input Signals
Input slew rate for differential signals (CK, CK# and DQS, DQS#) are defined and measured as shown below.
Table 30. Differential Input Slew Rate Definition
Measured
Description
Defined by
From
To
Differential input slew rate for rising edge
(CK, CK# and DQS, DQS#)
VILdiffmax VIHdiffmin
[VIHdiffmin-VILdiffmax] / DeltaTRdiff
[VIHdiffmin-VILdiffmax] / DeltaTFdiff
Differential input slew rate for falling edge
(CK, CK# and DQS, DQS#)
VIHdiffmin VILdiffmax
NOTE: The differential signal (i.e., CK, CK# and DQS, DQS#) must be linear between these thresholds.
Table 31. Single-ended AC and DC Output Levels
Symbol
Parameter
-12 BCN/BIN
0.8 x VDDQ
Unit Note
VOH(DC) DC output high measurement level (for IV curve linearity)
V
V
V
VOM(DC)
VOL(DC)
VOH(AC)
VOL(AC)
DC output mid measurement level (for IV curve linearity)
DC output low measurement level (for IV curve linearity)
AC output high measurement level (for output SR)
AC output low measurement level (for output SR)
0.5 x VDDQ
0.2 x VDDQ
VTT + 0.1 x VDDQ
V
1
1
VTT - 0.1 x VDDQ
V
NOTE 1: The swing of ± 0.1 × VDDQ is based on approximately 50% of the static single-ended output high or low swing
with a driver impedance of 40 Ω and an effective test load of 25 Ω to VTT = VDDQ/2.
Table 32. Differential AC and DC Output Levels
Symbol
Parameter
-12 BCN/BIN
+ 0.2 x VDDQ
- 0.2 x VDDQ
Unit Note
VOHdiff(AC) AC differential output high measurement level (for output SR)
VOLdiff(AC) AC differential output low measurement level (for output SR)
V
V
1
1
NOTE 1: The swing of ± 0.2 × VDDQ is based on approximately 50% of the static single-ended output high or low swing
with a driver impedance of 40 Ω and an effective test load of 25 Ω to VTT = VDDQ/2 at each of the differential
outputs.
Confidential
55
Rev. 3.0
Aug. /2014
ALSC [ ALLIANCE SEMICONDUCTOR CORPORATION ]
