Datasheet

SAS/SATA Single Lane 2:1/1:2 Multiplexer/
Demultiplexer Plus Redriver with Equalization
MAX4986
11
Table 4. Input Equalization
Table 5. OOB Mode Select
Table 6. Output Amplitude Selection
X = Don’t care.
X = Don’t care.
X = Don’t care.
*See the Electrical Characteristics table.
SAS/SATA Mode Inputs
(MODE, MODEA, MODEB)
The MAX4986 supports both SAS and SATA OOB levels.
When MODE, MODEA, or MODEB are driven low or left
unconnected, the corresponding input’s OOB threshold
is 120mV
P-P
(min) (SAS mode). When MODE, MODEA,
or MODEB are driven high, the corresponding input’s
OOB threshold is 50mV
P-P
(min) (SATA mode). Signals
below the OOB threshold are squelched to prevent
unwanted noise from being redriven at the output. See
Table 5. MODE, MODEA, and MODEB have internal pull-
down resistors of 330kI (typ).
Output Amplitude Selection Inputs
(OAMP, OAMPA, OAMPB)
The MAX4986 features independent output amplitude
selection. When OAMP, OAMPA, or OAMPB are driven
high, the corresponding output amplitude is low. When
OAMP, OAMPA, or OAMPB are driven low or left uncon-
nected, the corresponding output amplitude is high.
See Table 6. OAMP, OAMPA, and OAMPB have internal
pulldown resistors of 330kI (typ).
INEQ EQA EQB INP/INM INAP/INAM INBP/INBM
0 X X 0dB X X
1 X X 4dB X X
X 0 X X 0dB X
X 1 X X 4dB X
X X 0 X X 0dB
X X 1 X X 4dB
MODE MODEA MODEB INP/INM INAP/INAM INBP/INBM
0 X X SAS X X
1 X X SATA X X
X 0 X X SAS X
X 1 X X SATA X
X X 0 X X SAS
X X 1 X X SATA
OAMP OAMPA OAMPB OUTP/OUTM OUTAP/OUTAM OUTBP/OUTBM
0 X X HIGH* X X
1 X X LOW* X X
X 0 X X HIGH* X
X 1 X X LOW* X
X X 0 X X HIGH*
X X 1 X X LOW*