19-5952; Rev 1; 3/12
EVALUATION KIT AVAILABLE
MAX14972
Dual SuperSpeed USB 3.0 Equalizer/Redriver
General Description
The MAX14972 dual SuperSpeed USB 3.0 equalizer/
redriver utilizes programmable input equalization and
output deemphasis to reduce deterministic jitter and
restore signal loss caused by circuit-board or signal-
cable losses, and allows optimal placement of key
SuperSpeed USB 3.0 components and longer circuit-
board traces or cables. The device features advanced
power management with receiver detection and explicit
support for USB 3.0 low-frequency periodic signals
(LFPS).
The device is available in a small, 24-pin (4.0mm x
4.0mm) TQFN package with flow-through traces for opti-
mal layout and minimal space requirements. The device
is specified over the 0NC to +70NC commercial operating
temperature range.
Benefits and Features
S
Innovative Design Eliminates Need for Costly
External Components
Single +3.3V Supply Operation
S
Advanced Power Management for Maximum
Efficiency
1mW (typ) in Standby State
23mW (typ) in Receiver Detect State
82.5mW (typ) in Dynamic Power-Down State
304mW (typ) in Active State
S
High Level of Integration for Performance
Very Low Latency with 250ps (typ) Propagation
Delay
10dB (typ) Input/Output Return Loss Up to 2.5GHz
Three-Level Programmable Input Equalization
Six-Level Programmable Output Deemphasis
Explicit LFPS Support with Frequency Shaping
SuperSpeed USB 3.0-Compliant Receiver
Detection
Low-Voltage (1.8V) Compatible Controls
Excellent Jitter and Loss Compensation Capability
> 40in of 4mil Microstrip
S
Ideal for Space-Sensitive Applications
On-Chip 50I Input/Output Terminations
24-Pin, 4.0mm x 4.0mm TQFN Packaging
±8kV HBM ESD Protection on All Pins
Pin-to-Pin Compatible with TI SN65LVPE502
and TI SN65LVPE502CP
Applications
USB Ports
USB Hubs
Notebook Computers
Desktop Computers
Docking Stations
Industrial USB Switching
Ordering Information
appears at end of data sheet.
Typical Operating Circuit
V
CC
MAIN BOARD
100nF (X7R)
TX+
100nF (X7R)
TX-
USB 3.0
HOST
100nF (X7R)
RX+
100nF (X7R)
RX-
TX2-
GND
RX2-
TX2+
RX1-
TX1-
RX1+
TX1+
100nF (X7R)
SINGLE DIFFERENTIAL PAIR
RX-
100nF (X7R)
RX2+
SINGLE DIFFERENTIAL PAIR
100nF (X7R)
TX-
TX+
USB 3.0
DEVICE
REMOTE BOARD
0.1µF
100nF (X7R)
MIDPLANE
RX+
MAX14972
CONNECTORS
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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.
MAX14972
Dual SuperSpeed USB 3.0 Equalizer/Redriver
ABSOLUTE MAXIMUM RATINGS
(Voltages referenced to GND.)
V
CC
..................................................................... -0.3V to +4.0V
All Other Pins (Note 1) ........................... -0.3V to (V
CC
+ 0.3V)
Continuous Current RX_+, RX_-, TX_+, TX_- .................
Q30mA
Continuous Power Dissipation (T
A
= +70NC)
TQFN (derate 27.8mW/NC above +70NC) ............ 2222.2mW
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 opera-
tion 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.
Operating Temperature Range ........................... 0NC to +70NC
Junction Temperature Range ........................ -40NC to +150NC
Storage Temperature Range ......................... -65NC to +150NC
Lead Temperature (soldering, 10s) ...............................+300NC
Soldering Temperature (reflow) .....................................+260NC
PACKAGE THERMAL CHARACTERISTICS (Note 2)
TQFN
Junction-to-Ambient Thermal Resistance (q
JA
) ......... 36NC/W
Junction-to-Case Thermal Resistance (q
JC
) .................3NC/W
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.
ELECTRICAL CHARACTERISTICS
(V
CC
= +3.0V to +3.6V, C
C
= 100nF coupling capacitor on each output, R
L
= 50I and C
L
= 1pF on each output, T
A
= 0NC to +70NC,
unless otherwise noted. Typical values are at V
CC
= +3.3V and T
A
= +25NC.)
PARAMETER
DC PERFORMANCE
Power-Supply Range
V
CC
ENRXD = 1, data rate = 5.0Gbps, D10.2
pattern, DE_ = V
CC
, OS_ = GND
Operating Supply Current
I
CC
ENRXD = 1, CM = 0, no output
termination
Dynamic power-down mode,
ENRXD = 1, CM = 0, with output
termination, no input signal
Standby Supply Current
Differential Input Impedance
Differential Output Impedance
Single-Ended High Input
Impedance
Common-Mode Input Impedance
Common-Mode Output
Impedance
Common-Mode Input Voltage
Common-Mode Output Voltage
Active LFPS Common-Mode Delta
I
STBY
Z
RX-DC-DIFF
Z
TX-DC-DIFF
Z
RX-SE-HIGH
Z
RX-DC-CM
Z
TX-DC-CM
V
RX-DC-CM
V
TX-DC-CM
DV
LFPS-CM
ENRXD = 0
DC
DC
No output termination, CM = 0 (Note 3)
(Note 3)
(Note 4)
(Note 3)
(Note 3)
Active LFPS squelched and not
squelched
72
72
25
18
18
0
2.75
50
50
30
30
3.0
3.3
92
7
3.6
125
10
V
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
mA
25
32
500
120
120
FA
I
I
kI
I
I
V
V
mV
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Maxim Integrated Products
2
MAX14972
Dual SuperSpeed USB 3.0 Equalizer/Redriver
ELECTRICAL CHARACTERISTICS (continued)
(V
CC
= +3.0V to +3.6V, C
C
= 100nF coupling capacitor on each output, R
L
= 50I and C
L
= 1pF on each output, T
A
= 0NC to +70NC,
unless otherwise noted. Typical values are at V
CC
= +3.3V and T
A
= +25NC.)
PARAMETER
AC PERFORMANCE (Note 5)
Redriver-Operation Differential
Input Signal Range
LFPS Detect Threshold
Differential Input Return Loss
Differential Output Return Loss
Common-Mode Input Return Loss
Common-Mode Output Return
Loss
V
RX-DIFF-PP
V
LFPS-DIFF-PP
RL
RX-DIFF
RL
TX-DIFF
RL
RX-CM
RL
TX-CM
USB 3.0 data
USB 3.0 data
50MHz
P
f < 1250MHz
1250MHz
P
f < 2500MHz
50MHz
P
f < 1250MHz
1250MHz
P
f < 2500MHz
50MHz
P
f < 2500MHz
50MHz
P
f < 2500MHz
OS_ = 0, DE_ = 0
OS_ = 0, DE_ = N.C.
Differential Output Amplitude
(Transition Bit), Figure 1
V
TX-DIFF-TB-PP
OS_ = 0, DE_ = 1
OS_ = 1 or N.C., DE_ = 0
OS_ = 1 or N.C., DE_ = N.C.
OS_ = 1 or N.C., DE_ = 1
Differential Output Amplitude
(Nontransition Bit), Figure 1
LFPS Idle Differential Output
Voltage
Voltage Change to Allow Receiver
Detect
Deterministic Jitter
Random Jitter
Rise/Fall Time
Differential Propagation Delay
LFPS Idle Entry Delay
LFPS Idle Exit Delay
DE_ = N.C.
V
TX-DIFF-NTB-PP
DE_ = 0
DE_ = 1
V
LFPS-IDLE-
DIFF -PP
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
150
100
16
8
13
8
11
11
18
12
16
10
13
13
1120
940
1210
1180
1010
1270
640
840
940
1200
300
mV
P-P
mV
dB
dB
dB
dB
mV
P-P
mV
P-P
Highpass filter to remove DC offset
Positive voltage to sense receiver
termination
K28.5 pattern, data rate = 5.0Gbps,
EQ_ = not connected
K28.5 pattern, data rate = 5.0Gbps,
EQ_ = not connected
(Note 6)
Propagation delay input to output at 50%
USB 3.0 LFPS pattern, active state
USB 3.0 LFPS pattern, active state
USB 3.0 LFPS pattern, dynamic power-
down state
40
250
4
4
15.6
30
500
12
1
mV
mV
ps
P-P
ps
RMS
ps
ps
V
DETECT
t
TX-DJ-DD
t
TX-RJ-DD
t
TX-RISE-FALL
t
PD
t
IDLE-ENTRY
t
IDLE-EXIT
6
6
22.5
ns
ns
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Maxim Integrated Products
3
MAX14972
Dual SuperSpeed USB 3.0 Equalizer/Redriver
ELECTRICAL CHARACTERISTICS (continued)
(V
CC
= +3.0V to +3.6V, C
C
= 100nF coupling capacitor on each output, R
L
= 50I and C
L
= 1pF on each output, T
A
= 0NC to +70NC,
unless otherwise noted. Typical values are at V
CC
= +3.3V and T
A
= +25NC.)
PARAMETER
CONTROL LOGIC
Input Logic-High
Input Logic-Low
Input Logic Hysteresis
ESD PROTECTION
HBM ESD Protection
Note
Note
Note
Note
3:
4:
5:
6:
Human Body Model
±8
kV
V
IH
V
IL
V
HYST
ENRXD, CM, EQ_, OS_, and DE_
ENRXD, CM, EQ_, OS_, and DE_
ENRXD, CM, EQ_, OS_, and DE_
0.075
1.5
0.5
V
V
V
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
Measured with respect to ground.
Measured with respect to V
CC
.
Guaranteed by design, unless otherwise noted.
Rise and fall times are measured using 20% and 80% levels.
V
TX-DIFF-NTB-PP
V
TX-DIFF-TB-PP
DE(dB) = 20 log
V
TX-DIFF-NTB-PP
V
TX-DIFF-TB-PP
Figure 1. Illustration of Output Deemphasis
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Maxim Integrated Products
4
MAX14972
Dual SuperSpeed USB 3.0 Equalizer/Redriver
Typical Operating Characteristics
(V
CC
= 3.3V, T
A
= +25NC, EQ_ = N.C., using 5Gbps
QK28.5
pattern, unless otherwise noted.)
DE_ = N.C, OS_ = N.C or 1,
V
RX-DIFF-PP
= 150mV
P-P
MAX14972 toc01
DE_ = N.C, OS_ = 0,
V
RX-DIFF-PP
= 150mV
P-P
MAX14972 toc02
600
EYE DIAGRAM VOLTAGE (mV)
400
200
0
-200
-400
-600
-200ps
-100ps
-50ps
0ps
50ps
100ps
150ps
600
EYE DIAGRAM VOLTAGE (mV)
400
200
0
-200
-400
-600
200ps
-200ps
-100ps
-50ps
0ps
50ps
100ps
150ps
200ps
-150ps
-150ps
DE_ = N.C, OS_ = N.C or 1,
V
RX-DIFF-PP
= 1200mV
P-P
600
EYE DIAGRAM VOLTAGE (mV)
400
200
0
-200
-400
-600
-200ps
-100ps
-50ps
0ps
50ps
100ps
150ps
200ps
MAX14972 toc03
DE_ = N.C, OS_ = 0,
V
RX-DIFF-PP
= 1200mV
P-P
MAX14972 toc04
600
EYE DIAGRAM VOLTAGE (mV)
400
200
0
-200
-400
-600
-200ps
-100ps
-50ps
0ps
50ps
100ps
150ps
200ps
-150ps
-150ps
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Maxim Integrated Products
5
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