Datasheet

Address, Command and Control Overshoot and Undershoot specifications
Table 75. AC overshoot/undershoot for Address, Command and Control pins
Symbol
Parameter
DDR4-2400
DDR4-2666
Unit
Note
V
AOSP
Maximum peak amplitude above V
AOS
0.06
TBD
V
V
AOS
Upper boundary of overshoot area A
AOS1
V
DD
+ 0.24
TBD
V
1
V
AUS
Maximum peak amplitude allowed for undershoot
0.30
TBD
V
A
AOS2
Maximum overshoot area per 1 t
CK
above V
AOS
0.0055
TBD
V-ns
A
AOS1
Maximum overshoot area per 1 t
CK
between V
DD
and V
AOS
0.1699
TBD
V-ns
A
AUS
Maximum undershoot area per 1 t
CK
below V
SS
0.1762
TBD
V-ns
(A0-A13, BG0, BA0-BA1, ACT#, RAS#/A16, CAS#/A15, WE#/A14, CS#, CKE, ODT)
Note 1. The value of V
AOS
matches V
DD
absolute max as defined in “Absolute Maximum DC Ratings”. Absolute Maximum DC Ratings if
V
DD
equals V
DD
max as defined in "Recommended DC Operating Conditions”. If V
DD
is above the recommended operating
conditions, V
AOS
remains at V
DD
absolute max as defined in “Absolute Maximum DC Ratings”
Clock Overshoot and Undershoot Specifications
Table 76. AC overshoot/undershoot specification for Clock
Symbol
Parameter
DDR4-2400
DDR4-2666
Unit
Note
V
COSP
Maximum peak amplitude above V
COS
0.06
TBD
V
V
COS
Upper boundary of overshoot area A
DOS1
V
DD
+ 0.24
TBD
V
1
V
CUS
Maximum peak amplitude allowed for undershoot
0.30
TBD
V
A
COS2
Maximum overshoot area per 1 UI above V
COS
0.0025
TBD
V-ns
A
COS1
Maximum overshoot area per 1 UI between V
DD
and V
DOS
0.0750
TBD
V-ns
A
CUS
Maximum undershoot area per 1 UI below V
SS
0.0762
TBD
V-ns
(CK, CK#)
Note 1. The value of V
COS
matches V
DD
absolute max as defined in “Absolute Maximum DC Ratings”. Absolute Maximum DC Ratings if
V
DD
equals V
DD
max as defined in "Recommended DC Operating Conditions”. If V
DD
is above the recommended operating
conditions, V
COS
remains at V
DD
absolute max as defined in “Absolute Maximum DC Ratings”
Data, Strobe and Mask Overshoot and Undershoot Specifications
Table 77. AC overshoot/undershoot specification for Clock
Symbol
Parameter
DDR4-2400
DDR4-2666
Unit
Note
V
DOSP
Maximum peak amplitude above V
DOS
0.16
TBD
V
V
DOS
Upper boundary of overshoot area A
DOS1
V
DDQ
+ 0.24
TBD
V
1
V
DUS
Lower boundary of undershoot area A
DUS1
0.30
TBD
V
2
V
DUSP
Maximum peak amplitude below V
DUS
0.10
TBD
V
A
DOS2
Maximum overshoot area per 1 UI above V
DOS
0.0100
TBD
V-ns
A
DOS1
Maximum overshoot area per 1 UI between V
DDQ
and V
DOS
0.0700
TBD
V-ns
A
CUS1
Maximum undershoot area per 1 UI between V
SSQ
and V
DUS1
0.0700
TBD
V-ns
A
CUS2
Maximum undershoot area per 1 UI below V
DUS
0.0100
TBD
V-ns
(DQ, DQS, DQS#, DM#, DBI#)
Note 1. The value of V
DOS
matches (V
IN
, V
OUT
) max as defined in “Absolute Maximum DC Ratings”. Absolute Maximum DC Ratings if V
DDQ
equals V
DDQ
max as defined in "Recommended DC Operating Conditions”. If V
DDQ
is above the recommended operating
conditions, V
DOS
remains at (V
IN
, V
OUT
) max as defined in “Absolute Maximum DC Ratings”
Note 2. The value of V
DUS
matches (V
IN
, V
OUT
) min as defined in “Absolute Maximum DC Ratings”.
AS4C256M16D4
Confidential
- 161 of 201 -
Rev.1.0 Aug.2019