Marvel 88F6281 User Manual
Electrical Specifications
DC Electrical Specifications
Copyright © 2008 Marvell
Doc. No. MV-S104859-U0 Rev. E
December 2, 2008, Preliminary
Document Classification: Proprietary Information
Page 83
8.5.3
SDRAM DDR2 Interface DC Electrical Specifications
In the following table, VREF is VDD_M/2 and VDDIO means the VDD_M power rail.
Table 41: SDRAM DDR2 Interface DC Electrical Specifications
Parameter
Symbol
Test Condition
Min
Typ
Max
Units Notes
Input low level
VIL
-
-0.3
VREF - 0.125
V
-
Input high level
VIH
-
VREF + 0.125
VDDIO + 0.3
V
-
Output low level
VOL
IOL = 13.4 mA
0.28
V
-
Output high level
VOH
IOH = -13.4 mA
1.42
V
-
120
150
180
ohm
1 , 2
60
75
90
ohm
1 , 2
40
50
60
ohm
1 , 2
Deviation of VM w ith respect to VDDQ/2
dVm
See note 3
-6
6
%
3
Input leakage current
IIL
0 < VIN < VDDIO
-10
10
uA
4, 5
Pin capacitance
Cpin
-
5
pF
-
Notes:
General comment: See the Pin Description section for internal pullup/pulldow n.
1. See SDRAM functional description section for ODT configuration.
2. Measurement definition for RTT: Apply VREF +/- 0.25 to input pin separately,
then measure current I
(VREF + 0.25)
and I
(VREF - 0.25)
respectively.
3. Measurement definition for VM: Measured voltage (VM) at input pin (midpoint) w ith no load.
4. While I/O is in High-Z.
5. This current does not include the current flow ing through the pullup/pulldow n resistor.
Rtt effective impedance value
RTT
See note 2
)
25
.
0
(
)
25
.
0
(
5
.
0
−
+
−
=
VREF
VREF
I
I
RTT
%
100
1
2
×
⎟
⎠
⎞
⎜
⎝
⎛
−
×
=
VDDIO
Vm
dVM