19-4575; Rev 0; 4/09
KIT
ATION
EVALU
BLE
AVAILA
Dual Equalized 1.5/3.0/6.0 GT/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
(typ) Output
♦
Selectable Output Preemphasis
0, 3dB
♦
Inline Signal Traces for Flowthrough Layout
♦
Space-Saving, 3.5mm x 5.5mm TQFN Package
MAX4952A
The MAX4952A dual-channel redriver is designed to
redrive one full lane of SAS or SATA signals up to
6.0GT/s (gigatransfers per second) and operates from
a single +3.3V supply.
The MAX4952A features independent input equalization
and output preemphasis. The MAX4952A 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) signaling
is supported using high-speed amplitude detection
on the inputs and squelch on the corresponding outputs.
Inputs and outputs are all internally 50Ω terminated and
must be AC-coupled to the SAS/SATA controller IC and
SAS/SATA device.
The MAX4952A is available in a small 28-pin, 3.5mm x
5.5mm 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
MAX4952ACTI+
Ordering Information
TEMP RANGE
0°C to +70°C
PIN-PACKAGE
28 TQFN-EP*
+Denotes
a lead(Pb)-free/RoHS-compliant package.
*EP
= Exposed pad.
Pin Configuration
TOP VIEW
OUT0M
OUT0P
MODE
14 PE1
13 EQ1
12 PE0
*EP
1
V
CC
2
GND
3
IN0P
4
IN0M
5
GND
6
OUT1P
7
OUT1M
8
GND
9
V
CC
11 EQ0
10
EN
IN1M
IN1P
GND
GND
GND
V
CC
V
CC
24 23 22 21 20 19 18 17 16 15
GND 25
GND 26
GND 27
GND 28
MAX4952A
TQFN
*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.
Dual Equalized 1.5/3.0/6.0 GT/s
SAS/SATA Redriver
MAX4952A
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)
28-Pin TQFN (derate 28.6mW/°C above +70°C) .......2286mW
Junction-to-Case Thermal Resistance (θ
JC
) (Note 1)
28-Pin TQFN................................................................2.7°C/W
Junction-to-Ambient Thermal Resistance (θ
JA
) (Note 1)
28-Pin TQFN.................................................................35°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
0.1GHz
Differential Input Return Loss
(Note 3)
S
DD11
0.3GHz
3.0GHz
0.1GHz
Common-Mode Input Return
Loss (Note 3)
S
CC11
0.3GHz
3.0GHz
0.1GHz
Differential Output Return Loss
(Note 3)
S
DD22
0.3GHz
3.0GHz
0.1GHz
Common-Mode Output Return
Loss (Note 3)
Differential Input Voltage
Input Equalization
Differential Output Voltage
Output Preemphasis
Propagation Delay
Output Transition Time
S
CC22
0.3GHz
3.0GHz
V
IN-DIFF
EQ
V
OUT-DIFF
PE
t
PD
T
TX-RF
f
f
f
f
f
f
f
f
f
f
f
f
0.3GHz
3.0GHz
6.0GHz
0.3GHz
3.0GHz
6.0GHz
0.3GHz
3.0GHz
6.0GHz
0.3GHz
3.0GHz
6.0GHz
-10
-7.9
0
-6
-5
0
-10
-7.9
0
-6
-5
0
275
225
3
800
3
300
30
1200
1600
1600
mV
P-P
dB
mV
P-P
dB
ps
ps
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
140
175
16
TYP
MAX
3.6
175
220
20
57.5
57.5
UNITS
V
mA
mA
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
PE_ = EQ_ = GND
PE_ = GND, 20% to 80%
2
_______________________________________________________________________________________
Dual Equalized 1.5/3.0/6.0 GT/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
Differential Output Skew Same Pair
Deterministic Jitter
Random Jitter
OOB Squelch Threshold
OOB Squelch Entry Time
OOB Squelch 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
SK
T
DJ
T
RJ
V
SQ-DIFF
T
OOB,SQ
T
OOB,EX
V
OOB,DIFF
V
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
MIN
TYP
10
20
1.5
220
150
5
9
+50
+30
30
MAX
UNITS
ps
ps
P-P
ps
RMS
mV
P-P
ns
ns
mV
mV
mV
P-P
MAX4952A
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_P-P
V
HIGH_P-P
⎡⎛
⎡
V
HIGH_P-P
⎛⎢
⎜
PE(dB) = 20log
⎢⎜
⎢⎝
V
LOW_P-P
⎝⎢
⎣
⎣
Figure 1. Output Preemphasis
_______________________________________________________________________________________
3
Dual Equalized 1.5/3.0/6.0 GT/s
SAS/SATA Redriver
MAX4952A
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
MAX4952A toc01
V
IN
= 275mV
P-P
, 3Gbps, PE = 0, EQ = 0
MAX4952A toc02
V
IN
= 275mV
P-P
, 6Gbps, PE = 0, EQ = 0
600
EYE DIAGRAM VOLTAGE (200mV/div)
400
200
0
-200
-400
-600
MAX4952A toc03
EYE DIAGRAM VOLTAGE (200mV/div)
400
200
0
-200
-400
EYE DIAGRAM VOLTAGE (200mV/div)
-400
-200
0
200ps/div
200
400
400
200
0
-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
MAX4952A 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
MAX4952A 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
MAX4952A 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
MAX4952A toc07
4
_______________________________________________________________________________________
Dual Equalized 1.5/3.0/6.0 GT/s
SAS/SATA Redriver
Typical Operating Characteristics (continued)
(V
CC
= +3.3V, T
A
= +25°C, all eye diagrams measured using K28.5 pattern.)
MAX4952A
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
MAX4952A 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
MAX4952A 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
MAX4952A 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
MAX4952A 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
MAX4952A toc12
V
IN
= 500mV
P-P
WITH 20in FR4 STRIPLINE,
3GT/s, PE = 0, EQ = 0
MAX4952A toc13
V
IN
= 500mV
P-P
WITH 20in FR4 STRIPLINE,
6GT/s, PE = 0, EQ = 0
MAX4952A 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
京公网安备 11010802033920号
Copyright © 2005-2026 EEWORLD.com.cn, Inc. All rights reserved
电子工程世界
