19-4178; Rev 1; 5/09
SATA I/SATA II Bidirectional Re-Driver
General Description
The MAX4951 dual-channel buffer is designed to re-drive
serial-ATA (SATA) I and SATA II signals and is functional
up to 6.0Gbps for next-generation data rates. The
MAX4951 can be placed near an eSATA connector to
overcome board losses and produce an eSATA-compati-
ble signal level.
The MAX4951 preserves signal integrity at the receiver by
reestablishing full output levels, and can reduce the total
system jitter (T
J
) by squaring up the signal. This device
features channel-independent digital boost controls to
drive SATA outputs over longer trace lengths, or to meet
eSATA specifications. SATA Out-Of-Band (OOB) 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 SATA controller IC and SATA device.
The MAX4951 operates from a single +3.3V (typ) sup-
ply and is available in a small, 4mm x 4mm, TQFN
package with flow-through traces for ease of layout.
This device is specified over the 0°C to +70°C operat-
ing temperature range.
o
Single +3.3V (typ) Supply Operation
o
Supports SATA I (1.5Gbps) and SATA II (3.0Gbps)
o
Supports up to 6.0Gbps for Next-Generation
Applications
o
Meets SATA I, SATA II Input-/Output-Return Loss
Mask
o
Supports eSATA Levels
o
Supports SATA Out-of-Band (OOB) Signaling
Ω
o
Internal Input/Output 50Ω Termination Resistors
o
Inline Signal Traces for Flow-Through Layout
o
ESD Protection on All Pins: ±5.5kV
o
Space-Saving, 4mm x 4mm, TQFN Package
Features
MAX4951
Ordering Information
PART
MAX4951CTP+
TEMP RANGE
0°C to +70°C
PIN-PACKAGE
20 TQFN-EP*
Applications
Servers
Desktop Computers
Notebook Computers
Docking Stations
Data Storage/Workstations
+Denotes
a lead(Pb)-free/RoHS-compliant package.
*EP
= Exposed pad.
Pin Configuration
TOP VIEW
DAM
DBM
12
DAP
GND
DBP
11
10
9
V
CC
BA
BB
EN
V
CC
15
V
CC
16
GND 17
GND 18
GND 19
14
13
MAX4951
*EP
8
7
6
V
CC
20
1
HAP
2
HAM
3
GND
4
HBM
5
HBP
TQFN
4mm x 4mm
*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.
SATA I/SATA II Bidirectional Re-Driver
MAX4951
ABSOLUTE MAXIMUM RATINGS
(Voltages referenced to GND.)
V
CC
........................................................................-0.3V to +4.0V
HAP, HAM, DBP, DBM, EN, BA, BB
(Note 1)...................................................-0.3V to (V
CC
+ 0.3V)
Short-Circuit Output Current
(HBP, HBM, DAP, DAM) .................................................90mA
Continuous Current at Inputs
(HAP, HAM, DBP, DBM) ...............................................±30mA
Continuous Current
(EN, BA, BB) ...................................................................±5mA
Continuous Power Dissipation (T
A
= +70°C)
20-Pin TQFN (derate 25.6mW/°C above +70°C) ..... 2051mW
Junction-to-Case Thermal Resistance (θ
JC
) (Note 2)
20-Pin TQFN...................................................................6°C/W
Junction-to-Ambient Thermal Resistance (θ
JA
) (Note 2)
20-Pin TQFN.................................................................39°C/W
Operating Temperature Range...............................0°C to +70°C
Storage Temperature Range .............................-55°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
Note 1:
All I/O pins are clamped by internal diodes.
Note 2:
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
L
= 10nF, 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 3)
PARAMETER
Operating Power-Supply Range
Operating Supply Current
Standby Supply Current
Single-Ended Input Resistance
Differential Input Resistance
Single-Ended Output Resistance
Differential Output Resistance
AC PERFORMANCE
f = 150MHz to 300MHz
f = 300MHz to 600MHz
Differential Input Return Loss
(Note 4)
RL
RX-DIFF
f = 600MHz to 1200MHz
f = 1.2GHz to 2.4GHz
f = 2.4GHz to 3.0GHz
f = 3.0GHz to 5.0GHz
f = 150MHz to 300MHz
f = 300MHz to 600MHz
Common-Mode Input Return Loss
(Note 4)
RL
RX-CM
f = 600MHz to 1200MHz
f = 1.2GHz to 2.4GHz
f = 2.4GHz to 3.0GHz
f = 3.0GHz to 5.0GHz
-29
-26
-22
-18
-15
-14
-18
-14
-10
-8
-3
-1
-5
-5
-2
-2
-2
-1
dB
dB
SYMBOL
V
CC
I
CC
I
STBY
Z
RX-SE-DC
Z
RX-DIFF-DC
Z
TX-SE-DC
Z
TX-DIFF-DC
BA = BB = V
CC
BA = BB = GND
EN = GND
40
85
40
85
100
115
100
115
CONDITIONS
MIN
3.0
90
70
7
TYP
MAX
3.6
125
100
10
UNITS
V
mA
mA
Ω
Ω
Ω
Ω
2
_______________________________________________________________________________________
SATA I/SATA II Bidirectional Re-Driver
ELECTRICAL CHARACTERISTICS (continued)
(V
CC
= +3.0V to +3.6V, C
L
= 10nF, 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 3)
PARAMETER
SYMBOL
CONDITIONS
f = 150MHz to 300MHz
f = 300MHz to 600MHz
Differential Output Return Loss
(Note 4)
RL
TX-DIFF
f = 600MHz to 1200MHz
f = 1.2GHz to 2.4GHz
f = 2.4GHz to 3.0GHz
f = 3.0GHz to 5.0GHz
f = 150MHz to 300MHz
f = 300MHz to 600MHz
Common-Mode Output Return Loss
(Note 4)
RL
TX-CM
f = 600MHz to 1200MHz
f = 1.2GHz to 2.4GHz
f = 2.4GHz to 3.0GHz
f = 3.0GHz to 5.0GHz
Differential Input Signal Range
Differential Output Swing
Propagation Delay
Output Rise/Fall Time
Deterministic Jitter
Random Jitter
OOB Detector Threshold
OOB Output Startup/Shutdown Time
Crosstalk
LOGIC INPUT
Input Logic-High
Input Logic-Low
Input Logic Hysteresis
ESD PROTECTION
All Pins
Human Body Model
±5.5
kV
V
IH
V
IL
V
HYST
0.1
1.4
0.6
V
V
V
V
RX-DFF-PP
V
TX-DFF-PP
t
PD
t
R
T
TX-DJ-DFF
T
TX-RJ-DFF
V
TH-OOB
t
OOB
CTK
(Notes 4, 5)
Up to 6.0Gbps (Notes 4, 6)
Up to 6.0Gbps (Notes 4, 6)
SATA OOB
(Note 7)
f
≤
1.5GHz
BA = BB = GND
BA = BB = V
CC
50
2
-35
-30
SATA 1.5Gbps/3.0Gbps
f = 750MHz
BA = BB = GND
BA = BB = V
CC
220
450
770
525
930
240
60
15
1.8
150
5
MIN
TYP
-32
-26
-21
-16
-15
-13
MAX
-14
-8
-6
-6
-3
-1
-8
-5
-2
-2
-2
-1
1600
650
1144
mV
P-P
mV
P-P
ps
ps
ps
P-P
ps
RMS
mV
P-P
ns
dB
dB
dB
UNITS
MAX4951
Note 3:
Note 4:
Note 5:
Note 6:
Note 7:
All devices are 100% production tested at T
A
= +70°C. All temperature limits are guaranteed by design.
Guaranteed by design.
Rise and fall times are measured using 20% and 80% levels.
DJ measured using K28.5 pattern; RJ measured using K28.7 pattern.
Total time for OOB detection circuit to enable/squelch the output.
_______________________________________________________________________________________
3
SATA I/SATA II Bidirectional Re-Driver
MAX4951
Typical Operating Characteristics
(V
CC
= 3.3V, T
A
= +25°C, all eye diagrams measured using K28.5 pattern.)
BA = BB = GND EYE DIAGRAM
(V
RX-DFF-PP
= 220mV
P-P
, 1.5Gbps)
MAX4951 toc01
BA = BB = GND EYE DIAGRAM
(V
RX-DFF-PP
= 220mV
P-P
, 3.0Gbps)
300
EYE DIAGRAM VOLTAGE (mV)
200
100mV/div
100
0
-100
-200
-300
-300
-200
-100
0
100ps/div
100
200
300
MAX4951 toc02
BA = BB = GND EYE DIAGRAM
(V
RX-DFF-PP
= 220mV
P-P
, 6.0Gbps)
300
EYE DIAGRAM VOLTAGE (mV)
200
100mV/div
-150
-100
-50
0
50ps/div
50
100
150
100
0
-100
-200
-300
MAX4951 toc03
300
EYE DIAGRAM VOLTAGE (mV)
200
0
-100
-200
-300
-600
-400
-200
0
200ps/div
200
400
600
100mV/div
100
BA = BB = GND EYE DIAGRAM
(V
RX-DFF-PP
= 1600mV
P-P
, 1.5Gbps)
MAX4951 toc04
BA = BB = GND EYE DIAGRAM
(V
RX-DFF-PP
= 1600mV
P-P
, 3.0Gbps)
MAX4951 toc05
BA = BB = GND EYE DIAGRAM
(V
RX-DFF-PP
= 1600mV
P-P
, 6.0Gbps)
300
EYE DIAGRAM VOLTAGE (mV)
200
100mV/div
-150
-100
-50
0
50ps/div
50
100
150
100
0
-100
-200
-300
MAX4951 toc06
300
EYE DIAGRAM VOLTAGE (mV)
200
300
EYE DIAGRAM VOLTAGE (mV)
200
100mV/div
0
-100
-200
-300
-600
-400
-200
0
200ps/div
200
400
600
0
-100
-200
-300
-300
-200
-100
0
100ps/div
100
200
300
BA = BB = V
CC
EYE DIAGRAM
(V
RX-DFF-PP
= 220mV
P-P
, 1.5Gbps)
MAX4951 toc07
BA = BB = V
CC
EYE DIAGRAM
(V
RX-DFF-PP
= 220mV
P-P
, 3.0Gbps)
MAX4951 toc08
100mV/div
100
100
BA = BB = V
CC
EYE DIAGRAM
(V
RX-DFF-PP
= 220mV
P-P
, 6.0Gbps)
500
400
300
200
100
0
-100
-200
-300
-400
-500
-150
-100
-50
0
50ps/div
50
100
200mV/div
150
MAX4951 toc09
600
400
200
EYE DIAGRAM VOLTAGE (mV)
EYE DIAGRAM VOLTAGE (mV)
0
-200
-400
-600
-600
-400
-200
0
200ps/div
200
400
600
200
100
0
-100
-200
-300
-400
-500
-300
-200
-100
0
100ps/div
100
200
300
4
_______________________________________________________________________________________
EYE DIAGRAM VOLTAGE (mV)
500
400
300
200mV/div
200mV/div
SATA I/SATA II Bidirectional Re-Driver
MAX4951
Typical Operating Characteristics (continued)
(V
CC
= 3.3V, T
A
= +25°C, all eye diagrams measured using K28.5 pattern.)
BA = BB = V
CC
EYE DIAGRAM
(V
RX-DFF-PP
= 1600mV
P-P
, 1.5Gbps)
MAX4951 toc10
BA = BB = V
CC
EYE DIAGRAM
(V
RX-DFF-PP
= 1600mV
P-P
, 3.0Gbps)
MAX4951 toc11
BA = BB = V
CC
EYE DIAGRAM
(V
RX-DFF-PP
= 1600mV
P-P
, 6.0Gbps)
MAX4951 toc12
600
400
200
600
400
200
600
400
200
0
-200
-400
-600
EYE DIAGRAM VOLTAGE (mV)
EYE DIAGRAM VOLTAGE (mV)
EYE DIAGRAM VOLTAGE (mV)
200mV/div
200mV/div
0
-200
-400
-600
-600
-400
-200
0
200ps/div
200
400
600
0
-200
-400
-600
-300
-200
-100
0
100ps/div
100
200
300
-150
-100
-50
0
50ps/div
50
100
150
DIFFERENTIAL INPUT RETURN LOSS
vs. FREQUENCY
MAX4951 toc13
DIFFERENTIAL OUTPUT RETURN LOSS
vs. FREQUENCY
DIFFERENTIAL OUTPUT RETURN LOSS (dB)
0
-5
-10
-15
-20
-25
-30
-35
-40
-45
0
1
2
3
FREQUENCY (GHz)
4
5
MAX4951
SATA MASK
MAX4951 toc14
5
DIFFERENTIAL INPUT RETURN LOSS (dB)
0
-5
-10
-15
-20
-25
-30
-35
-40
-45
0
1
2
3
FREQUENCY (GHz)
4
5
MAX4951
SATA MASK
5
_______________________________________________________________________________________
5
200mV/div
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