Rainbow Electronics MAX4951 User Manual
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-compatible signal level.
The MAX4951 preserves signal integrity at the receiver by
reestablishing full output levels, and can reduce the total
system jitter (TJ) 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) supply 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 operating temperature range.
Applications
Servers
Desktop Computers
Notebook Computers
Docking Stations
Data Storage/Workstations
Features
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
o Internal Input/Output 50
Ω
Ω
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
MAX4951
SATA I/SATA II Bidirectional Re-Driver
________________________________________________________________
Maxim Integrated Products
1
Ordering Information
19-4178; Rev 1; 5/09
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.
+
Denotes a lead(Pb)-free/RoHS-compliant package.
*
EP = Exposed pad.
Pin Configuration
19
20
18
17
7
6
8
HAM
HBP
9
HAP
DAM
DBM
DBP
DAP
1 2
GND
45
15 14 12 11
GND
V
CC
BA
BB
EN
V
CC
MAX4951
GND
GND
3
13
GND
16
10
V
CC
V
CC
TQFN
4mm x 4mm
TOP VIEW
HBM
*EP
*CONNECT EXPOSED PAD (EP) TO GND.
PART TEMP RANGE PIN-PACKAGE
MAX4951CTP+ 0°C to +70°C 20 TQFN-EP*
MAX4951
SATA I/SATA II Bidirectional Re-Driver
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(VCC= +3.0V to +3.6V, CL= 10nF, RL= 50Ω, TA= 0°C to +70°C, unless otherwise noted. Typical values are at VCC= +3.3V, TA= +25°C.)
(Note 3)
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.
(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
.
Operating Power-Supply Range V
Operating Supply Current I
Standby Supply Current I
Single-Ended Input Resistance Z
Differential Input Resistance Z
Single-Ended Output Resistance Z
Differential Output Resistance Z
AC PERFORMANCE
Differential Input Return Loss
(Note 4)
Common-Mode Input Return Loss
(Note 4)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
CC
CC
STBY
RX-SE-DC
RX-DIFF-DC
TX-SE-DC
TX-DIFF-DC
RL
RX-DIFF
RL
RX-CM
BA = BB = V
BA = BB = GND 70 100
EN = GND 7 10 mA
f = 150MHz to 300MHz -29 -18
f = 300MHz to 600MHz -26 -14
f = 600MHz to 1200MHz -22 -10
f = 1.2GHz to 2.4GHz -18 -8
f = 2.4GHz to 3.0GHz -15 -3
f = 3.0GHz to 5.0GHz -14 -1
f = 150MHz to 300MHz -5
f = 300MHz to 600MHz -5
f = 600MHz to 1200MHz -2
f = 1.2GHz to 2.4GHz -2
f = 2.4GHz to 3.0GHz -2
f = 3.0GHz to 5.0GHz -1
CC
3.0 3.6 V
90 125
40 Ω
85 100 115 Ω
40 Ω
85 100 115 Ω
mA
dB
dB
MAX4951
SATA I/SATA II Bidirectional Re-Driver
_______________________________________________________________________________________ 3
ELECTRICAL CHARACTERISTICS (continued)
(VCC= +3.0V to +3.6V, CL= 10nF, RL= 50Ω, TA= 0°C to +70°C, unless otherwise noted. Typical values are at VCC= +3.3V, TA= +25°C.)
(Note 3)
Note 3: All devices are 100% production tested at TA= +70°C. All temperature limits are guaranteed by design.
Note 4: Guaranteed by design.
Note 5: Rise and fall times are measured using 20% and 80% levels.
Note 6: DJ measured using K28.5 pattern; RJ measured using K28.7 pattern.
Note 7: Total time for OOB detection circuit to enable/squelch the output.
Differential Output Return Loss
(Note 4)
Common-Mode Output Return Loss
(Note 4)
Differential Input Signal Range V
Differential Output Swing V
Propagation Delay t
Output Rise/Fall Time t
Deterministic Jitter T
Random Jitter T
OOB Detector Threshold V
OOB Output Startup/Shutdown Time t
Crosstalk CTK f ≤ 1.5GHz
LOGIC INPUT
Input Logic-High V
Input Logic-Low V
Input Logic Hysteresis V
ESD PROTECTION
All Pins Human Body Model ±5.5 kV
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
f = 150MHz to 300MHz -32 -14
f = 300MHz to 600MHz -26 -8
RL
TX-DIFF
RL
TX-CM
RX-DFF-PP
TX-DFF-PP
PD
R
TX-DJ-DFF
TX-RJ-DFF
TH-OOB
OOB
IH
IL
HYST
f = 600MHz to 1200MHz -21 -6
f = 1.2GHz to 2.4GHz -16 -6
f = 2.4GHz to 3.0GHz -15 -3
f = 3.0GHz to 5.0GHz -13 -1
f = 150MHz to 300MHz -8
f = 300MHz to 600MHz -5
f = 600MHz to 1200MHz -2
f = 1.2GHz to 2.4GHz -2
f = 2.4GHz to 3.0GHz -2
f = 3.0GHz to 5.0GHz -1
SATA 1.5Gbps/3.0Gbps 220 1600 mV
f = 750MHz
(Notes 4, 5) 60 ps
Up to 6.0Gbps (Notes 4, 6) 15 ps
Up to 6.0Gbps (Notes 4, 6) 1.8 ps
SATA OOB 50 150 mV
(Note 7) 2 5 ns
BA = BB = GND 450 525 650
BA = BB = V
BA = BB = GND -35
BA = BB = V
CC
CC
770 930 1144
240 ps
-30
1.4 V
0.6 V
0.1 V
mV
dB
dB
P-P
P-P
P-P
RMS
P-P
dB
Loading...