MAX4986 [MAXIM]
SAS/SATA Single Lane 2:1/1:2 Multiplexer/Demultiplexer Plus Redriver with Equalization; SAS / SATA单通道2 ： 1/1 ： 2多路复用器/多路解复用器加转接驱动器，具有均衡
| 型号： | MAX4986 |
| 厂家： | 
MAXIM INTEGRATED PRODUCTS |
| 描述： | SAS/SATA Single Lane 2:1/1:2 Multiplexer/Demultiplexer Plus Redriver with Equalization |
| 文件： | 总14页 (文件大小：1645K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
19-5127; Rev 1; 7/12
SAS/SATA Single Lane 2:1/1:2 Multiplexer/
Demultiplexer Plus Redriver with Equalization
General Description
The MAX4986 active 2:1/1:2 multiplexer/demultiplexer
equalizes and redrives SAS/SATA or SATA-only signals
up to 6.0Gbps and operates from a single +3.3V supply.
Features
S Single +3.3V Supply Operation
S Low-Power, 1mA (typ) Standby
Active-High Enable (EN) for Use with Power Good
The MAX4986 features independent input equalization
and output preemphasis. The MAX4986 enhances sig-
nal integrity at the receiver by equalizing the signal at
the input and establishing preemphasis at the output
of the device. SAS/SATA and SATA-only out-of-band
(OOB) signaling is supported using high-speed ampli-
tude detection on the inputs and squelch on the corre-
sponding outputs. Inputs and outputs are internally 50I
terminated and must be AC-coupled to the SAS/SATA
controller IC and SAS/SATA device.
Active-Low Enable (EN) for Cable-Detect Function
S Supports SAS I/II/III P 6.0Gbps
S Independent Programmable Input Equalization
Two Levels: 0dB, 4dB
S Independent Programmable Output Preemphasis
Two Levels: 0dB, 3dB
S Independent Programmable Output Level
Selection
S Supports SAS/SATA OOB-Level Signaling
The MAX4986 is available in a small (3.5mm x 9.0mm),
42-pin TQFN package optimal for simplified layout and
space-saving requirements. The MAX4986C is specified
over the 0NC to +70NC commercial operating tempera-
ture range. The MAX4986E is specified over the -40NC to
+85NC extended temperature range.
Programmable SAS/SATA Threshold
S Cable-Detect Feature for Low Power Consumption
S On-Chip 50I Input/Output Terminations
S Inline Signal Traces for Simplified Layout
S Space-Saving, 3.5mm x 9.0mm TQFN Package
with Exposed Pad
Applications
PC Servers
Ordering Information
Workstations
Desktops
PART
TEMP RANGE
0NC to +70NC
-40NC to +85NC
PIN-PACKAGE
42 TQFN-EP*
42 TQFN-EP*
MAX4986CTO+
MAX4986ETO+
Docking Stations
+Denotes a lead(Pb)-free/RoHS-compliant package.
*EP = Exposed pad.
For pricing, delivery, and ordering information, please contact Maxim Direct
at 1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
1
SAS/SATA Single Lane 2:1/1:2 Multiplexer/
Demultiplexer Plus Redriver with Equalization
ABSOLUTE MAXIMUM RATINGS
(Voltages Referenced to GND.)
Operating Temperature Range ........................ -40NC to +85NC
Junction Temperature Range ........................ -40NC to +150NC
Storage Temperature Range ......................... -65NC to +150NC
Lead Temperature (soldering, 10s) ...............................+300NC
Soldering Temperature (reflow) .....................................+260NC
V
CC
..................................................................... -0.3V to +4.0V
All Other Pins (Note 1) ........................... -0.3V to (V
Continuous Current IN_P, IN_M, OUT_P, OUT_M ........ Q30mA
Peak Current IN_P, IN_M, OUT_P, OUT_M for 1Fs .... Q100mA
+ 0.3V)
CC
Continuous Power Dissipation (T = +70NC)
A
42-Pin TQFN (derate 34.5mW/NC above +70NC) .... 2758mW
Note 1: All I/O pins are clamped by internal diodes.
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute
maximum rating conditions for extended periods may affect device reliability.
ELECTRICAL CHARACTERISTICS
(V = +3.0V to +3.6V, C = 10nF coupling capacitor on each input and output, R = 50Ion each input and output, T = 0NC to +70NC
CC
CL
L
A
(MAX4986C), T = -40NC to +85NC (MAX4986E), unless otherwise noted. Typical values are at V
= +3.3V and T = +25NC.) (Note 2)
A
A
CC
PARAMETER
DC PERFORMANCE
Power-Supply Range
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
V
CC
3.0
3.6
4
V
2.5
1.0
EN = 0 or EN = 1, V
EN = 0 or EN = 1, V
= 3.6V
= 3.3V
CC
Standby Current
I
mA
STBY
2
CC
OUTPE = PEA = PEB = 0,
INEQ = EQA = EQB = 0
145
185
170
Supply Current
I
mA
CC
OUTPE = PEA = PEB = 1,
INEQ = EQA = EQB = 1
230
57.5
57.5
Input Termination, Single-Ended
R
DC
42.5
42.5
I
I
RX-SE
Output Termination, Single-
Ended
R
DC
TX-SE
AC PERFORMANCE
0.1GHz < f P 0.3GHz
-10
-7.9
0
Input Return Loss, Differential
(Note 3)
SDD11
SCC11
SDD22
SCC22
0.3GHz < f P 3.0GHz
dB
dB
dB
dB
3.0GHz < f P 6.0GHz
0.1GHz < f P 0.3GHz
-6
Input Return Loss,
Common Mode (Note 3)
0.3GHz < f P 3.0GHz
-5
3.0GHz < f P 6.0GHz
0
0.1GHz < f P 0.3GHz
-10
-7.9
0
Output Return Loss, Differential
(Note 3)
0.3GHz < f P 3.0GHz
3.0GHz < f P 6.0GHz
0.1GHz < f P 0.3GHz
-6
Output Return Loss,
Common Mode (Note 3)
0.3GHz < f P 3.0GHz
-5
3.0GHz < f P 6.0GHz
0
SAS 1.5Gbps, 3Gbps, MODE_ = 0
SAS 6Gbps, MODE_ = 0
SATA 1.5Gbps, 3Gbps, 6Gbps, MODE_ = 1
f = 1.5GHz, INEQ = 1
275
300
225
1600
1600
1600
Differential Input Voltage
V
mV
IN-DIFF
P-P
Input Equalization
EQ
4
dB
OAMP_ = 0
OAMP_ = 1
700
425
1200
700
f = 0.75GHz, 1.5GHz,
PE_ = 0
Differential Output Voltage
V
mV
OUT-DIFF
P-P
2
SAS/SATA Single Lane 2:1/1:2 Multiplexer/
Demultiplexer Plus Redriver with Equalization
ELECTRICAL CHARACTERISTICS (continued)
(V = +3.0V to +3.6V, C = 10nF coupling capacitor on each input and output, R = 50Ion each input and output, T = 0NC to +70NC
CC
CL
L
A
(MAX4986C), T = -40NC to +85NC (MAX4986E), unless otherwise noted. Typical values are at V
= +3.3V and T = +25NC.) (Note 2)
A
A
CC
PARAMETER
Output Preemphasis
Propagation Delay
SYMBOL
CONDITIONS
MIN
TYP
3
MAX
UNITS
dB
PE
f = 1.5GHz, PE_ = 1, Figure 1
t
300
60
ps
PD
Output Transition Time
t
f < 3.0GHz, PE_ = 0 (Notes 3, 4)
40
ps
TX-RF
Differential Output Skew Same
Pair
t
10
ps
SK
Deterministic Jitter
Random Jitter
t
K28.5Q pattern, PE_ = 0, EQ_ = 0 (Note 3)
20
1.5
220
150
10
ps
P-P
DJ
t
D10.2 pattern, PE_ = 0, EQ_ = 0
1
ps
RMS
TX-RJ-DD
MODE_ = 0
f = 0.75GHz (Note 3)
MODE_ = 1
120
50
OOB Squelch Threshold
V
mV
P-P
SQ-DIFF
OOB Squelch Time
OOB Exit Time
t
f = 0.75GHz (Note 3)
f = 0.75GHz (Note 3)
5
5
ns
OOB,SQ
t
10
ns
OOB,EX
Difference between OOB and active-mode
output offset
OOB Differential-Offset Delta
OOB Common-Mode Delta
DV
-80
-50
80
mV
OOB,DIFF
Difference between OOB and active-mode
DV
50
30
mV
OOB,CM
output V
CM
OOB Output Disable
CONTROL LOGIC
V
OOB-disabled output level
mV
P-P
OOB,OUT
Input Logic-High
V
1.4
V
V
IH
Input Logic-Low
V
0.6
IL
Input Logic Hysteresis
Pullup/Pulldown Input Resistor
V
0.1
V
HYST
UP/DOWN
R
330
kI
Note 2: MAX4986C devices are 100% production tested at T = +70°C. MAX4986E devices are 100% production tested at T
=
A
A
+85°C. Specifications for all temperature limits are guaranteed by design.
Note 3: Guaranteed by design.
Note 4: Rise and fall times are measured using 20% and 80% levels.
V
V
HIGH_P-P
LOW_P-P
V
HIGH_P-P
PE(dB) = 20log
V
LOW_P-P
Figure 1. Output Preemphasis
3
SAS/SATA Single Lane 2:1/1:2 Multiplexer/
Demultiplexer Plus Redriver with Equalization
Typical Operating Characteristics
(T = +25°C, unless otherwise noted.)
A
V
IN
= 275mV , 1.5Gbps, PE = 0, EQ = 0
V
IN
= 275mV , 3.0Gbps, PE = 0, EQ = 0
V = 275mV , 6.0Gbps, PE = 0, EQ = 0
IN P-P
MAX4986 toc03
P-P
P-P
MAX4986 toc01
MAX4986 toc02
600
400
200
0
600
400
200
0
600
400
200
0
-200
-400
-600
-200
-400
-600
-200
-400
-600
-600 -400 -200
0
200
400
600
-300 -200 -100
0
100
200
300
-150 -100
-50
0
50
100
150
200ps/div
100ps/div
50ps/div
V
IN
= 275mV , 1.5Gbps, PE = 1, EQ = 0
V
IN
= 275mV , 3.0Gbps, PE = 1, EQ = 0
V = 275mV , 6.0Gbps, PE = 1, EQ = 0
IN P-P
MAX4986 toc06
P-P
P-P
MAX4986 toc04
MAX4986 toc05
800
600
400
200
0
800
600
400
200
0
800
600
400
200
0
-200
-400
-600
-800
-200
-400
-600
-800
-200
-400
-600
-800
-600 -400 -200
0
200
400
600
-300 -200 -100
0
100
200
300
-150 -100
-50
0
50
100
150
200ps/div
100ps/div
50ps/div
V
= 1600mV , 1.5Gbps, PE = 0, EQ = 0
P-P
MAX4986 toc07
IN
V
= 1600mV , 3.0Gbps, PE = 0, EQ = 0
V = 1600mV , 6.0Gbps, PE = 0, EQ = 0
IN P-P
MAX4986 toc09
IN
P-P
MAX4986 toc08
600
400
200
0
600
400
200
0
600
400
200
0
-200
-400
-600
-200
-400
-600
-200
-400
-600
-600 -400 -200
0
200
400
600
-300 -200 -100
0
100
200
300
-150 -100
-50
0
50
100
150
200ps/div
100ps/div
50ps/div
4
SAS/SATA Single Lane 2:1/1:2 Multiplexer/
Demultiplexer Plus Redriver with Equalization
Typical Operating Characteristics (continued)
(T = +25°C, unless otherwise noted.)
A
V
= 1600mV , 3.0Gbps, PE = 1, EQ = 0
P-P
MAX4986 toc11
V
= 1600mV , 1.5Gbps, PE = 1, EQ = 0
P-P
MAX4986 toc10
IN
IN
800
600
400
200
0
800
600
400
200
0
-200
-400
-600
-800
-200
-400
-600
-800
-300 -200 -100
0
100
200
300
-600 -400 -200
0
200
400
600
100ps/div
200ps/div
V
IN
= 500mV
WITH 12in FR4 STRIPLINE INPUT,
3.0Gbps, PE = 0, EQ = 0
P-P
V
= 1600mV , 6.0Gbps, PE = 1, EQ = 0
P-P
MAX4986 toc12
IN
MAX4986 toc13
800
600
400
200
0
600
400
200
0
-200
-400
-600
-800
-200
-400
-600
-150 -100
-50
0
50
100
150
-300 -200 -100
0
100
200
300
50ps/div
100ps/div
V
IN
= 500mV
WITH 12in FR4 STRIPLINE INPUT,
3.0Gbps, PE = 0, EQ = 1
V
IN
= 500mV
WITH 12in FR4 STRIPLINE INPUT,
P-P
P-P
6.0Gbps, PE = 0, EQ = 0
MAX4986 toc15
MAX4986 toc14
600
400
200
0
600
400
200
0
-200
-400
-600
-200
-400
-600
-300 -200 -100
0
100
200
300
-150 -100
-50
0
50
100
150
100ps/div
50ps/div
5
SAS/SATA Single Lane 2:1/1:2 Multiplexer/
Demultiplexer Plus Redriver with Equalization
Typical Operating Characteristics (continued)
(T = +25°C, unless otherwise noted.)
A
V
IN
= 500mV
WITH 12in FR4 STRIPLINE INPUT,
6.0Gbps, PE = 0, EQ = 1
V = 275mV , 3.0Gbps, PE = 0, EQ = 0
IN P-P
P-P
OUTPUT AFTER 12in FR4 STRIPLINE
MAX4986 toc16
MAX4986 toc17
600
400
200
0
600
400
200
0
-200
-400
-600
-200
-400
-600
-150 -100
-50
0
50
100
150
-300 -200 -100
0
100
200
300
50ps/div
100ps/div
V
IN
= 275mV , 6.0Gbps, PE = 0, EQ = 0
V = 275mV , 3.0Gbps, PE = 1, EQ = 0
IN P-P
P-P
OUTPUT AFTER 12in FR4 STRIPLINE
OUTPUT AFTER 12in FR4 STRIPLINE
MAX4986 toc18
MAX4986 toc19
500
400
300
200
100
0
600
400
200
0
-100
-200
-300
-400
-500
-200
-400
-600
-150 -100
-50
0
50
100
150
-300 -200 -100
0
100
200
300
50ps/div
100ps/div
V
IN
= 275mV , 6.0Gbps, PE = 1, EQ = 0
P-P
OUTPUT AFTER 12in FR4 STRIPLINE
MAX4986 toc20
600
400
200
0
-200
-400
-600
-150 -100
-50
0
50
100
150
50ps/div
6
SAS/SATA Single Lane 2:1/1:2 Multiplexer/
Demultiplexer Plus Redriver with Equalization
Pin Configuration
TOP VIEW
38 37 36 35 34 33 32 31 30 29 28 27 26 25 24 23 22
39
40
21 EQA
PEA
PEB
20 EQB
MAX4986
INEQ 41
19 OUTPE
18 OAMP
MODE 42
*EP
10 11 12 13 14 15 16 17
+
1
2
3
4
5
6
7
8
9
TQFN
*CONNECT EXPOSED PAD TO GND.
Pin Description
PIN
NAME
FUNCTION
Power-Supply Input. Bypass V
device as possible; recommended for each V
to GND with 1FF and 0.01FF capacitors in parallel as close to the
CC
1, 17, 22, 38
V
CC
pin.
CC
OUTAP/OUTAM Output Level Selection. Drive OAMPA high for low output amplitude. Drive OAMPA
low or leave unconnected for high output amplitude. See the Electrical Characteristics table.
OAMPA is internally pulled down by a 330kI (typ) resistor.
2
3
OAMPA
OAMPB
GND
OUTBP/OUTBM Output Level Selection. Drive OAMPB high for low output amplitude. Drive OAMPB
low or leave unconnected for high output amplitude. See the Electrical Characteristics table.
OAMPB is internally pulled down by a 330kI (typ) resistor.
4, 7, 11, 14,
23, 26, 29,
31, 34, 37
Ground
5
6
INP
Channel 1 Noninverting Input
Channel 1 Inverting Input
INM
Channel 1 Active-Output Selection Input. Drive SEL1 low or leave unconnected to activate A
outputs. Drive SEL1 high to activate B outputs. SEL1 is internally pulled down by a 330kI (typ)
resistor.
8
SEL1
Channel 2 Active-Input Selection Input. Drive SEL2 low or leave unconnected to activate A inputs.
Drive SEL2 high to activate B inputs. SEL2 is internally pulled down by a 330kI (typ) resistor.
9
SEL2
EN
Enable Input. Drive EN low or leave unconnected for reduced power standby mode. Drive EN high
for normal operation. See Table 1. EN is internally pulled down by a 330kI (typ) resistor.
10
12
13
OUTP
OUTM
Channel 2 Noninverting Output
Channel 2 Inverting Output
7
SAS/SATA Single Lane 2:1/1:2 Multiplexer/
Demultiplexer Plus Redriver with Equalization
Pin Description (continued)
PIN
NAME
FUNCTION
INAP/INAM OOB-Mode Logic Input. Drive MODEA low or leave unconnected for SAS OOB thresh-
old. Drive MODEA high for SATA OOB threshold. MODEA is internally pulled down by a 330kI
(typ) resistor.
15
MODEA
INBP/INBM OOB-Mode Logic Input. Drive MODEB low or leave unconnected for SAS OOB thresh-
old. Drive MODEB high for SATA OOB threshold. MODEB is internally pulled down by a 330kI
(typ) resistor.
16
18
19
20
21
MODEB
OAMP
OUTPE
EQB
OUTP/OUTM Output Level Selection. Drive OAMP high for low output amplitude. Drive OAMP low
or leave unconnected for high output amplitude. See the Electrical Characteristics table. OAMP is
internally pulled down by a 330kI (typ) resistor.
OUTP/OUTM Output Preemphasis Logic Input. Drive OUTPE low or leave unconnected for no out-
put preemphasis. Drive OUTPE high for 3dB (typ) output preemphasis. OUTPE is internally pulled
down by a 330kI (typ) resistor.
INBP/INBM Input Equalization Logic Input. Drive EQB low or leave unconnected for no input equal-
ization. Drive EQB high for 4dB (typ) input equalization. EQB is internally pulled down by a 330kI
(typ) resistor.
INAP/INAM Input Equalization Logic Input. Drive EQA low or leave unconnected for no input equal-
ization. Drive EQA high for 4dB (typ) input equalization. EQA is internally pulled down by a 330kI
(typ) resistor.
EQA
24
25
27
28
INBM
INBP
INAM
INAP
Channel 2 Inverting Input B
Channel 2 Noninverting Input B
Channel 2 Inverting Input A
Channel 2 Noninverting Input A
Active-Low Enable Input. Drive EN high or leave unconnected for reduced power standby mode.
Drive EN low for normal operation. See Table 1. EN is internally pulled up by a 330kI (typ) resistor.
30
EN
32
33
35
36
OUTBM
OUTBP
OUTAM
OUTAP
Channel 1 Inverting Output B
Channel 1 Noninverting Output B
Channel 1 Inverting Output A
Channel 1 Noninverting Output A
OUTAP/OUTAM Output Preemphasis Logic Input. Drive PEA low or leave unconnected for no out-
put preemphasis. Drive PEA high for 3dB (typ) output preemphasis. PEA is internally pulled down
by a 330kI (typ) resistor.
39
40
41
PEA
PEB
OUTBP/OUTBM Output Preemphasis Logic Input. Drive PEB low or leave unconnected for no out-
put preemphasis. Drive PEB high for 3dB (typ) output preemphasis. PEB is internally pulled down
by a 330kI (typ) resistor.
INP/INM Input Equalization Logic Input. Drive INEQ low or leave unconnected for no input equaliza-
tion. Drive INEQ high for 4dB (typ) input equalization. INEQ is internally pulled down by a 330kI
(typ) resistor.
INEQ
INP/INM OOB-Mode Logic Input. Drive MODE low or leave unconnected for SAS OOB threshold.
Drive MODE high for SATA OOB threshold. MODE is internally pulled down by a 330kI (typ)
resistor.
42
—
MODE
EP
Exposed Pad. Internally connected to GND. Connect EP to a large ground plane to maximize ther-
mal performance.
8
SAS/SATA Single Lane 2:1/1:2 Multiplexer/
Demultiplexer Plus Redriver with Equalization
Functional Diagram
V
CC
PEA
PEB
OAMPA
OAMPB
INEQ
V
CC
V
CC
V
CC
V
CC
CHANNEL 1
CONTROL
MODE
SEL1
OUTAP
OUTAM
V
CC
INP
OUTBP
OUTBM
INM
EN
EN
GLOBAL CONTROL
V
CC
INAP
INAM
OUTP
OUTM
SEL2
EQA
INBP
INBM
EQB
CHANNEL 2
CONTROL
OUTPE
OAMP
MODEA
MODEB
MAX4986
GND
9
SAS/SATA Single Lane 2:1/1:2 Multiplexer/
Demultiplexer Plus Redriver with Equalization
left unconnected, the MAX4986 enters reduced power
standby mode and the redrivers are disabled. In standby
mode, supply current is reduced to 350FA (typ). Drive
EN high and EN low for normal operation. See Table
1. EN is useful as an automated cable-detect. See the
Typical Application Circuits.
Detailed Description
The MAX4986 is an active 2:1/1:2 multiplexer/demul-
tiplexer designed to equalize and redrive SAS/SATA
(Enterprise Class, SATA _X) or SATA-only signals up to
6.0Gbps.
Input/Output Terminations
Active Input/Output Select (SEL1, SEL2)
Inputs and outputs are internally 50I terminated to V
CC
SEL1 selects the active output for channel 1 and SEL2
selects the active input for channel 2. Drive SEL1 or
SEL2 low or leave unconnected to activate A inputs or
outputs. Drive SEL1 or SEL2 high to activate B inputs
or outputs. See Table 2. SEL1 and SEL2 have internal
pulldown resistors of 330kI (typ).
and must be AC-coupled using low-ESR, X7R, 10nF
capacitors to the SAS/SATA controller IC and SAS/SATA
device for proper operation.
Enable Inputs (EN, EN)
The MAX4986 features both an active-high enable input
(EN) and an active-low enable input (EN). EN has an
internal pulldown resistor of 330kI (typ), and EN has an
internal pullup resistor of 330kI(typ). When EN is driven
low or left unconnected, or when EN is driven high or
Programmable Output Preemphasis
(OUTPE, PEA, PEB)
The MAX4986 features independent output preemphasis
capable of providing 3dB preemphasis on each channel.
When OUTPE, PEA, or PEB are driven low or left uncon-
nected, the corresponding output has no preemphasis.
When OUTPE, PEA, or PEB are driven high, the cor-
responding output has 3dB preemphasis. See Table 3.
OUTPE, PEA, and PEB have internal pulldown resistors
of 330kI (typ). Output preemphasis should be used
when driving long traces or cables.
Table 1. Standby Mode
EN
STATUS
Reduced Power Standby
Reduced Power Standby
Active
EN
X
0
X
1
1
0
X = Don’t care.
Programmable Input Equalization
(INEQ, EQA, EQB)
Table 2. Active Input/Output Select
The MAX4986 features independent input equalization
capable of providing 4dB of high-frequency equalization
on each channel. When INEQ, EQA, or EQB are driven
low or left unconnected, the corresponding input has no
equalization. When INEQ, EQA, or EQB are driven high,
the corresponding input has 4dB equalization. See Table 4.
INEQ, EQA, and EQB have internal pulldown resistors of
330kI (typ). Input equalization should be used for long
traces or cables.
SEL1
SEL2
ACTIVE OUTPUT
ACTIVE INPUT
X
X
0
1
0
1
X
X
X
INAP/INAM
X
INBP/INBM
OUTAP/OUTAM
OUTBP/OUTBM
X
X
X = Don’t care.
Table 3. Output Preemphasis
OUTPE
PEA
PEB
X
OUTP/OUTM
OUTAP/OUTAM
OUTBP/OUTBM
0
1
X
X
X
X
X
0dB
3dB
X
X
X
X
X
X
X
0
X
0dB
3dB
X
X
1
X
X
X
X
0
X
0dB
3dB
X
1
X
X
X = Don’t care.
10
SAS/SATA Single Lane 2:1/1:2 Multiplexer/
Demultiplexer Plus Redriver with Equalization
Table 4. Input Equalization
INEQ
EQA
EQB
INP/INM
INAP/INAM
INBP/INBM
0
1
X
X
X
X
X
X
0
1
X
X
X
X
X
X
0
1
0dB
4dB
X
X
X
X
X
0dB
4dB
X
X
X
X
X
0dB
4dB
X
X
X = Don’t care.
Table 5. OOB Mode Select
MODE
MODEA
MODEB
INP/INM
INAP/INAM
INBP/INBM
0
1
X
X
X
X
X
X
0
1
X
X
X
X
X
X
0
1
SAS
X
X
X
X
SATA
X
X
X
X
SAS
SATA
X
X
X
SAS
SATA
X
X = Don’t care.
Table 6. Output Amplitude Selection
OAMP
OAMPA
OAMPB
OUTP/OUTM
OUTAP/OUTAM
OUTBP/OUTBM
0
1
X
X
X
X
X
X
0
1
X
X
X
X
X
X
0
1
HIGH*
X
X
X
X
LOW*
X
X
X
X
HIGH*
LOW*
X
X
X
HIGH*
LOW*
X
X = Don’t care.
*See the Electrical Characteristics table.
SAS/SATA Mode Inputs
Output Amplitude Selection 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
(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).
is 120mV
(min) (SAS mode). When MODE, MODEA,
P-P
or MODEB are driven high, the corresponding input’s
OOB threshold is 50mV (min) (SATA mode). Signals
P-P
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).
11
SAS/SATA Single Lane 2:1/1:2 Multiplexer/
Demultiplexer Plus Redriver with Equalization
Typical Application Circuits
MAIN BOARD
SAS
DRIVE
MAX4986
Tx
Rx
INA
INB
OUT
SEL1
SEL2
GPIO
Tx
Rx
OUTA
OUTB
IN
EN
MIDPLANE (FR4)
NOTE: TWO HOSTS SHARING A SINGLE SAS DRIVE WITH CABLE-DETECT.
MAIN BOARD
MAX4986
OUTA
Tx
IN
SAS
OUTB
EN
DRIVE A
SEL1
SEL2
GPIO
HOST
SAS
DRIVE B
INA
INB
Rx
OUT
MIDPLANE (FR4)
NOTE: SINGLE HOST WITH TWO SAS DRIVES AND CABLE-DETECT.
Exposed-Pad Package
Applications Information
The exposed-pad, 42-pin TQFN package incorporates
features that provide a very low-thermal resistance
path for heat removal from the IC. The exposed pad
on the MAX4986 must be soldered to the circuit board
ground plane for proper thermal performance. For
more information on exposed-pad packages, refer
to Maxim Application Note 862: HFAN-08.1: Thermal
Considerations of QFN and Other Exposed-Paddle
Packages.
Layout
Circuit board layout and design can significantly affect
the performance of the MAX4986. Use good, high-fre-
quency design techniques, including minimizing ground
inductance and using controlled impedance transmis-
sion lines on data signals. It is recommended to place
1FF and 0.01FF power-supply bypass capacitors in
parallel as close to V
as possible for each V
pin.
CC
CC
Always connect V
to a power plane.
CC
12
SAS/SATA Single Lane 2:1/1:2 Multiplexer/
Demultiplexer Plus Redriver with Equalization
Power-Supply Sequencing
Package Information
Caution: Do not exceed the absolute maximum rat-
For the latest package outline information and land patterns
ings because stresses beyond the listed ratings may
cause permanent damage to the device.
(footprints), go to www.maxim-ic.com/packages. Note that a
“+”, “#”, or “-” in the package code indicates RoHS status only.
Package drawings may show a different suffix character, but
the drawing pertains to the package regardless of RoHS status.
Proper power-supply sequencing is recommended for
all devices. Always apply GND then V before apply-
ing signals, especially if the signal is not current-limited.
CC
PACKAGE
TYPE
PACKAGE
CODE
OUTLINE
NO.
LAND
PATTERN NO.
Chip Information
42 TQFN-EP
T423590+1
21-0181
90-0078
PROCESS: BiCMOS
13
SAS/SATA Single Lane 2:1/1:2 Multiplexer/
Demultiplexer Plus Redriver with Equalization
Revision History
REVISION
NUMBER
REVISION
DATE
PAGES
CHANGED
DESCRIPTION
0
1
1/10
7/12
Initial release
Added MAX4986ETO+ to data sheet
—
1, 2, 3
Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied.
Maxim reserves the right to change the circuitry and specifications without notice at any time. The parametric values (min and max limits) shown in the Electrical
Characteristics table are guaranteed. Other parametric values quoted in this data sheet are provided for guidance.
14
Maxim Integrated Products, Inc. 160 Rio Robles, San Jose, CA 95134 USA 1-408-601-1000
2012 Maxim Integrated Products Maxim is a registered trademark of Maxim Integrated Products, Inc.
©
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