Datasheet
Table 74. DRAM package electrical specifications
Symbol
Parameter
DDR4-2400/2666
Unit
Note
Min.
Max.
Z
IO
IInput/output Zpkg
45
85
Ω
1,2,4,5,10
T
dIO
Input/output Pkg Delay
14
42
ps
1,3,4,5,10
L
io
Input/Output Lpkg
-
3.3
nH
10,11
C
io
Input/Output Cpkg
-
0.78
pF
10,12
Z
IO DQS
DQS, DQS# Zpkg
45
85
Ω
1,2,5,10
T
dIO DQS
DQS, DQS# Pkg Delay
14
42
ps
1,3,5,10
L
io DQS
DQS Lpkg
-
3.3
nH
10,11
C
io DQS
DQS Cpkg
-
0.78
pF
10,12
DZ
DIO DQS
Delta Zpkg DQS, DQS#
-
10
Ω
1,2,5,7
D
TdDIO DQS
Delta Delay DQS, DQS#
-
5
ps
1,3,5,7
Z
I CTRL
Input CTRL pins Zpkg
50
90
Ω
1,2,5,9,10
T
dI_ CTRL
Input CTRL pins Pkg Delay
14
42
ps
1,3,5,9,10
L
i CTRL
Input CTRL Lpkg
-
3.4
nH
10,11
C
i CTRL
Input CTRL Cpkg
-
0.7
pF
10,12
Z
IADD CMD
Input- CMD ADD pins Zpkg
50
90
Ω
1,2,5,8,10
T
dIADD_ CMD
Input- CMD ADD pins Pkg Delay
14
45
ps
1,3,5,8,10
L
i ADD CMD
Input CMD ADD Lpkg
-
3.6
nH
10,11
C
i ADD CMD
Input CMD ADD Cpkg
-
0.74
pF
10,12
Z
CK
CLK# Zpkg
50
90
Ω
1,2,5,10
Td
CK
CLK# Pkg Delay
14
42
ps
1,3,5,10
L
i CLK
Input CLK Lpkg
-
3.4
nH
10,11
C
i CLK
Input CLK Cpkg
-
0.7
pF
10,12
DZ
DCK
Delta Zpkg CLK#
-
10
Ω
1,2,5,6
D
TdCK
Delta Delay CLK#
-
5
ps
1,3,5,6
Z
OZQ
ZQ Zpkg
-
100
Ω
1,2,5,10
Td
O ZQ
ZQ Delay
20
90
ps
1,3,5,10
Z
O ALERT
ALERT Zpkg
40
100
Ω
1,2,5,10
Td
O ALERT
ALERT Delay
20
55
ps
1,3,5,10
Note 1. This parameter is not subject to production test. It is verified by design and characterization. The package parasitic (L and C) are
validated using package only samples. The capacitance is measured with V
DD
, V
DDQ
, V
SS
, V
SSQ
shorted with all other signal pins
floating. The inductance is measured with V
DD
, V
DDQ
, V
SS
, V
SSQ
shorted and all other signal pins shorted at the die side (not pin).
Measurement procedure TBD.
Note 2. Package only impedance (Zpkg) is calculated based on the Lpkg and Cpkg total for a given pin where:
Zpkg (total per pin) = SQRT (Lpkg/Cpkg).
Note 3. Package only delay(Tpkg) is calculated based on Lpkg and Cpkg total for a given pin where:
Tdpkg (total per pin) = SQRT (Lpkg × Cpkg).
Note 4. Z
IO
and T
dIO
applies to DQ, DM, TDQS and TDQS#.
Note 5. This parameter applies to monolithic devices only.
Note 6. Absolute value of Z
CK
-Z
CK#
for impedance(Z) or absolute value of Td
CK
-Td
CK#
for delay(Td).
Note 7. Absolute value of Z
IO
(DQS)-Z
IO
(DQS#) for impedance(Z) or absolute value of T
dIO
(DQS)-T
dIO
(DQS#) for delay(Td).
Note 8. Z
IADD CMD
& T
dIADD_ CMD
applies to A0-A13, ACT#, BA0-BA1, BG0-BG1, RAS#/A16, CAS#/A15, WE#/A14 and PAR.
Note 9. Z
I CTRL
& T
dI_ CTRL
applies to ODT, CS# and CKE.
Note 10. Package implementations shall meet spec if the Zpkg and Pkg Delay fall within the ranges shown, and the maximum Lpkg and
Cpkg do not exceed the maximum values shown.
Note 11. It is assumed that Lpkg can be approximated as Lpkg = Zo x Td.
Note 12. It is assumed that Cpkg can be approximated as Cpkg = Td/Zo.
!
AS4C512M8D4
Confidential
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Rev.1.0. Aug.2019