19-4574; Rev 0; 4/09
KIT
ATION
EVALU
BLE
AVAILA
Quad Equalized 1.5/3.0/6.0GT/s
SAS/SATA Redriver
General Description
Features
♦
Single +3.3V Supply Operation
♦
SAS Gen I/II Up to 6.0GT/s
♦
Excellent Return Loss
8dB at 3.0GT/s
♦
Supports SAS/SATA OOB (Out-of-Band) Signaling
Very Fast Entry and Exit Time
5ns (typ)
♦
Internal Input/Output 50Ω Termination Resistors
♦
Selectable Input Equalization
0, 3dB
♦
Standard 1000mV
P-P
Selectable (typ) Output
♦
Selectable Preemphasis
0, 3dB
♦
Inline Signal Traces for Flowthrough Layout
♦
Space-Saving Package: 3.5mm x 9mm TQFN
MAX4952
The MAX4952 quad-channel redriver is designed to
redrive two full lanes of SAS or SATA signals up to
6.0GT/s (gigatransfers per second) and operates from
a single +3.3V supply.
The MAX4952 features independent input equalization
and output preemphasis. The MAX4952 enhances sig-
nal integrity at the receiver by equalizing the signal at
the input and establishing preemphasis at the output of
the device. SAS and SATA OOB (Out-of-Band) signal-
ing is supported using high-speed amplitude detection
on the inputs and squelch on the corresponding out-
puts. Inputs and outputs are all internally 50Ω terminat-
ed and must be AC-coupled to the SAS/SATA controller
IC and SAS/SATA device.
The MAX4952 is available in a small 42-pin, 3.5mm x
9mm TQFN package with flowthrough traces for ease of
layout. This device is specified over the 0°C to +70°C
operating temperature range.
Applications
Servers
Data Storage/Work Stations
Docking Stations
PART
MAX4952CTO+
Ordering Information
PIN-PACKAGE
42 TQFN-EP*
TEMP RANGE
0°C to +70°C
+Denotes
a lead(Pb)-free/RoHS-compliant package.
*EP
= Exposed paddle.
Pin Configuration
TOP VIEW
OUT1BM
OUT0AM
OUT1BP
OUT0AP
MODEA
21 PE1A
20 EQ1A
19 PE0A
*EP
1
MODEB
2
V
CC
3
GND
4
IN1BP
5
IN1BM
6
GND
7
OUT0BP
8
OUT0BM
9
V
CC
18 EQ0A
ENA
IN0BM
IN1AM
OUT1AM
IN0BP
IN1AP
GND
GND
GND
GND
GND
ENB
V
CC
V
CC
V
CC
V
CC
38 37 36 35 34 33 32 31 30 29 28 27 26 25 24 23 22
EQ0B 39
PE0B 40
EQ1B 41
PE1B 42
MAX4952
10 11 12 13 14 15 16 17
IN0AM
IN0AP
OUT1AP
GND
TQFN-EP
*CONNECT EXPOSED PAD (EP) TO GND.
________________________________________________________________
Maxim Integrated Products
1
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.
Quad Equalized 1.5/3.0/6.0GT/s
SAS/SATA Redriver
MAX4952
ABSOLUTE MAXIMUM RATINGS
(Voltages referenced to GND.)
V
CC
........................................................................-0.3V to +4.0V
All Other Pins..............................................-0.3V to (V
CC
+ 0.3V)
Continuous Current (PE_, EQ_, MODE_)..........................±15mA
Peak Current (for 10kHz, 1% duty cycle)
(IN__, OUT__) .............................................................±100mA
Continuous Power Dissipation (T
A
= +70°C)
42-Pin TQFN (derate 35.7mW/°C above +70°C) .......2857mW
Junction-to-Case Thermal Resistance (θ
JC
) (Note 1)
42-Pin TQFN...................................................................2°C/W
Junction-to-Ambient Thermal Resistance (θ
JA
) (Note 1)
42-Pin TQFN.................................................................28°C/W
Operating Temperature Range...............................0°C to +70°C
Storage Temperature Range .............................-55°C to +150°C
Junction Temperature ......................................................+150°C
Lead Temperature (soldering, 10s) .................................+300°C
Note 1:
Package thermal resistances were obtained using the method described in JEDEC specification JESD51-7, using a four-
layer board. For detailed information on package thermal considerations refer to
www.maxim-ic.com/thermal-tutorial.
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
CC
= +3.0V to +3.6V, C
COUPLE
= 12nF, R
L
= 50Ω, T
A
= 0°C to +70°C, unless otherwise noted. Typical values are at V
CC
= +3.3V,
T
A
= +25°C.) (Note 2)
PARAMETER
Operating Power-Supply Range
Operating Supply Current
Standby Supply Current
Input Termination
Output Termination
AC PERFORMANCE
Differential Input Return Loss
(Note 3)
0.1GHz
≤
f
≤
0.3GHz
S
DD11
0.3GHz
≤
f
≤
3.0GHz
3.0GHz
≤
f
≤
6.0GHz
0.1GHz
≤
f
≤
0.3GHz
S
CC11
0.3GHz
≤
f
≤
3.0GHz
3.0GHz
≤
f
≤
6.0GHz
0.1GHz
≤
f
≤
0.3GHz
S
DD22
0.3GHz
≤
f
≤
3.0GHz
3.0GHz
≤
f
≤
6.0GHz
0.1GHz
≤
f
≤
0.3GHz
S
CC22
0.3GHz
≤
f
≤
3.0GHz
3.0GHz
≤
f
≤
6.0GHz
V
IN-DIFF
EQ
V
OUT-DIFF
PE
SAS 1.5, 3.0, or 6.0GT/s, MODE_ = GND
SATA 1.5, 3.0, or 6.0GT/s, MODE_ = V
CC
EQ_ = V
CC
(Note 4)
f = 750MHz, PE_ = GND
PE_ = V
CC
, Figure 1
800
3
-10
-7.9
0
-6
-5
0
-10
-7.9
0
-6
-5
0
275
225
3
1200
1600
1600
mV
P-P
dB
mV
P-P
dB
dB
dB
dB
dB
SYMBOL
V
CC
I
CC
I
STBY
R
RX-SE
R
TX-SE
EQ_ = PE_ = GND
EQ_ = PE_ = V
CC
EN_ = GND
Single-ended to V
CC
Single-ended to V
CC
42.5
42.5
CONDITIONS
MIN
3.0
280
350
32
TYP
MAX
3.6
350
440
40
57.5
57.5
UNITS
V
mA
mA
Ω
Ω
Common-Mode Input Return
Loss (Note 3)
Differential Output Return Loss
(Note 3)
Common-Mode Output Return
Loss (Note 3)
Differential Input Voltage
Input Equalization
Differential Output Voltage
Output Preemphasis
2
_______________________________________________________________________________________
Quad Equalized 1.5/3.0/6.0GT/s
SAS/SATA Redriver
ELECTRICAL CHARACTERISTICS (continued)
(V
CC
= +3.0V to +3.6V, C
COUPLE
= 12nF, R
L
= 50Ω, T
A
= 0°C to +70°C, unless otherwise noted. Typical values are at V
CC
= +3.3V,
T
A
= +25°C.) (Note 2)
PARAMETER
Propagation Delay
Output Transition Time
Differential Output Skew Same Pair
Deterministic Jitter
Random Jitter
OOB Squelch Threshold
OOB Squelch Entry Time
OOB Exit Time
OOB Differential Offset Delta
OOB Common-Mode Offset Delta
OOB Output Disable
CONTROL LOGIC INPUTS
Input Logic-High
Input Logic-Low
Input Logic Hysteresis
Input Leakage Current
V
IH
V
IL
V
HYST
I
IN
V
CC
= 3.3V, V
IN
= 0.5V or 1.5V
-50
75
+50
1.4
0.6
V
V
mV
µA
SYMBOL
t
PD
T
TX-RF
T
SK
T
DJ
T
RJ
V
SQ-DIFF
T
OOB,SQ
T
OOB,EX
Δ
V
OOB,DIFF
ΔV
OOB,CM
V
OOB,OUT
K28.5 pattern, 6.0GT/s, PE_ = EQ_ = GND
(Note 3)
D10.2 pattern, 6.0GT/s, PE_ = EQ_ = GND
MODE_ = GND, f = 0.75GHz
MODE_ = V
CC
, f = 0.75GHz
f = 0.75GHz (Note 3)
f = 0.75GHz (Note 3)
Difference between OOB and active-mode
output offset
Difference between OOB and active-mode
output common-mode voltage
OOB disabled output level
-50
-30
120
50
CONDITIONS
PE_ = EQ_ = GND
PE_ = GND, 20% to 80%
40
10
20
1.8
220
150
5
9
+50
+30
30
MIN
TYP
300
MAX
UNITS
ps
ps
ps
ps
P-P
ps
RMS
mV
P-P
ns
ns
mV
mV
mV
P-P
MAX4952
Note 2:
All devices are 100% production tested at T
A
= +70°C. All temperature limits are guaranteed by design.
Note 3:
Guaranteed by design.
Note 4:
EQ (input equalization) as employed in this device refers to the equivalent of adding preemphasis before the input. For
example, input EQ of 3dB would show the same waveform as output PE of 3dB (see Figure 1).
Timing Diagram
V
LOW_PP
V
HIGH_PP
⎡⎛
⎡
V
HIGH_PP
⎛⎢
⎜
PE(dB) = 20log
⎢⎜
⎢⎝
V
LOW_PP
⎝⎢
⎣
⎣
Figure 1. Output Preemphasis
_______________________________________________________________________________________
3
Quad Equalized 1.5/3.0/6.0GT/s
SAS/SATA Redriver
MAX4952
Typical Operating Characteristics
(V
CC
= +3.3V, T
A
= +25°C, all eye diagrams measured using K28.5 pattern.)
V
IN
= 275mV
P-P
, 1.5Gbps, PE = 0, EQ = 0
MAX4952 toc01
V
IN
= 275mV
P-P
, 3Gbps, PE = 0, EQ = 0
MAX4952 toc02
V
IN
= 275mV
P-P
, 6Gbps, PE = 0, EQ = 0
600
EYE DIAGRAM VOLTAGE (200mV/div)
400
200
0
-200
-400
-600
MAX4952 toc03
EYE DIAGRAM VOLTAGE (200mV/div)
400
200
0
-200
-400
EYE DIAGRAM VOLTAGE (200mV/div)
400
200
0
-200
-400
-400
-200
0
200ps/div
200
400
-200
-100
0
100ps/div
100
200
-100
-50
0
50ps/div
50
100
V
IN
= 275mV
P-P
, 1.5Gbps, PE = 1, EQ = 0
800
EYE DIAGRAM VOLTAGE (200mV/div)
600
400
200
0
-200
-400
-600
-800
-400
-200
0
200ps/div
200
400
MAX4952 toc04
V
IN
= 275mV
P-P
, 3Gbps, PE = 1, EQ = 0
800
EYE DIAGRAM VOLTAGE (200mV/div)
600
400
200
0
-200
-400
-600
-800
-200
-100
0
100ps/div
100
200
MAX4952 toc05
V
IN
= 275mV
P-P
, 6Gbps, PE = 1, EQ = 0
800
EYE DIAGRAM VOLTAGE (200mV/div)
600
400
200
0
-200
-400
-600
-800
-100
-50
0
50ps/div
50
100
MAX4952 toc06
V
IN
= 1600mV
P-P
, 1.5Gbps, PE = 0, EQ = 0
600
EYE DIAGRAM VOLTAGE (200mV/div)
400
200
0
-200
-400
-600
-400
-200
0
200ps/div
200
400
MAX4952 toc07
4
_______________________________________________________________________________________
Quad Equalized 1.5/3.0/6.0GT/s
SAS/SATA Redriver
Typical Operating Characteristics (continued)
(V
CC
= +3.3V, T
A
= +25°C, all eye diagrams measured using K28.5 pattern.)
MAX4952
V
IN
= 1600mV
P-P
, 3Gbps, PE = 0, EQ = 0
600
EYE DIAGRAM VOLTAGE (200mV/div)
400
200
0
-200
-400
-600
-200
-100
0
100ps/div
100
200
MAX4952 toc08
V
IN
= 1600mV
P-P
, 6Gbps, PE = 0, EQ = 0
600
EYE DIAGRAM VOLTAGE (200mV/div)
400
200
0
-200
-400
-600
-100
-50
0
50ps/div
50
100
MAX4952 toc09
V
IN
= 1600mV
P-P
, 1.5Gbps, PE = 1, EQ = 0
800
EYE DIAGRAM VOLTAGE (200mV/div)
600
400
200
0
-200
-400
-600
-800
-400
-200
0
200ps/div
200
400
MAX4952 toc10
V
IN
= 1600mV
P-P
, 3Gbps, PE = 1, EQ = 0
800
EYE DIAGRAM VOLTAGE (200mV/div)
600
400
200
0
-200
-400
-600
-800
-200
-100
0
100ps/div
100
200
MAX4952 toc11
V
IN
= 1600mV
P-P
, 6Gbps, PE = 1, EQ = 0
800
EYE DIAGRAM VOLTAGE (200mV/div)
600
400
200
0
-200
-400
-600
-800
-100
-50
0
50ps/div
50
100
MAX4952 toc12
V
IN
= 500mV
P-P
WITH 20in. FR4 STRIPLINE,
3GT/s, PE = 0, EQ = 0
MAX4952 toc13
V
IN
= 500mV
P-P
WITH 20in. FR4 STRIPLINE,
6GT/s, PE = 0, EQ = 0
MAX4952 toc14
EYE DIAGRAM VOLTAGE (200mV/div)
400
200
0
-200
-400
-600
-300
-200
-100
0
100ps/div
100
200
300
EYE DIAGRAM VOLTAGE (200mV/div)
600
600
400
200
0
-200
-400
-600
-150
-100
-50
0
50ps/div
50
100
150
_______________________________________________________________________________________
5
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