Datasheet

SM646UDR26485-2-I
January 31, 2006
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18
ODT DC Electrical Characteristics
Notes:
1. R
TT1(EFF)
and R
TT2(EFF)
are determined by applying V
IH(AC)
and V
IL(AC)
to pin under test separately, then
measure current I(V
IH(AC)
) and I(V
IL(AC)
) respectively.
2. Measured voltage (VM) at tested pin with no load.
%
Parameter Symbol Min Nom Max Unit Notes
R
TT
effective impedence value for 75Ω
setting EMR (A6, A2) = 0, 1
R
TT1(EFF)
60 75 90 Ω 1
R
TT
effective impedence value for 150Ω
setting EMR (A6, A2) = 1, 0
R
TT2(EFF)
120 150 180 Ω 1
R
TT
effective impedence value for 50Ω
setting EMR (A6, A2) = 1, 1
R
TT3(EFF)
40 50 60 Ω 1
Deviation of VM with respect to V
DDQ
/2 ∆VM -6 +6 % 2
R
TT EFF()
V
IH AC()
V–
IL AC()
IV
IH AC()
()IV
IL AC()
()–
-------------------------------------------------------------------=
∆VM
2VM
×
V
DDQ
--------------------1–



100
×=
Output DC Current Drive
Notes:
1. For I
OH
(DC); V
DDQ
= 1.7V, V
OUT
= 1420mV. (V
OUT
- V
DDQ
)/I
OH
must be less than 21Ω for values of V
OUT
between V
DDQ
and V
DDQ
- 280mV.
2. For I
OL
(DC); V
DDQ
= 1.7V, V
OUT
= 280mV. V
OUT
/I
OL
must be less than 21Ω for values of V
OUT
between 0V
and 280mV.
3. The DC value of V
REF
applied to the receiving device is set to V
TT
.
4. The values of I
OH
(DC) and I
OL
(DC) are based on the conditions given in Notes 1 and 2. They are used to test
device drive current capability to ensure V
IH
min plus a noise margin and V
IL
max minus a noise margin are
delivered to an SSTL_18 receiver. The actual current values are derived by shifting the desired driver operating
point along a 21Ω load line to define a convenient driver current for measurement.
Parameter Symbol Min Max Unit Notes
Output Minimum Source DC Current I
OH
-13.4 - mA 1, 3, 4
Output Minimum Sink DC Current I
OL
13.4 - mA 2, 3, 4