General Description
The MAX4989 is a bidirectional 2-of-4 USB 2.0 crosspoint switch. The MAX4989 features the low on-capacitance and low on-resistance necessary to switch USB
2.0 low-/full-/Hi-Speed signals at data rates up to
480Mbps. This device allows any 2-of-4 USB pairs to
be connected together and is configured through a
simple 3-input control logic interface.
The MAX4989 operates from a single +2.7V to +5.5V
supply and features an internal charge pump to permit
full rail-to-rail swing. This device also features a highimpedance shutdown mode to reduce supply current to
100nA (typ).
The MAX4989 is available in a 14-pin, 3mm x 3mm
TDFN package and operates over the extended -40°C
to +85°C temperature range.
Applications
Notebook Computers
Cell Phones
Features
o Single +2.7V to +5.5V Supply Voltage
o Low 1µA (typ) Supply Current
o -3dB Bandwidth: 1GHz (typ)
o Low 5Ω (typ) R
ON
o High-Impedance Shutdown Mode
o Logic Inputs Control Signal Routing
o +1.8V CMOS-Logic Compatible
o Ultra-Small 14-Pin, 3mm x 3mm, TDFN Package
MAX4989
USB 2.0 Hi-Speed 2-of-4 Crosspoint Switch
________________________________________________________________
Maxim Integrated Products
1
19-4206; Rev 0; 8/08
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.
Ordering Information
+
Denotes a lead-free/RoHS-compliant package.
*
EP = Exposed pad.
Pin Configuration
EVALUATION KIT
AVAILABLE
EVALUATION KIT
AVAILABLE
PART TEMP RANGE
MAX4989ETD+ -40°C to +85°C
PACKAGE
14 TDFN-EP*
(3mm x 3mm)
PIN-
PKG
CODE
T1433-2
TOP VIEW
114
+
213
Y+
312
411
Z+
510
Z-
C0
69
78
*EP = EXPOSED PAD. CONNECT EP TO GROUND.
MAX4989
*EP
3mm x 3mm TDFN
W-Y-
W+
GNDGND
X+
X-
V
C2C1
CC
MAX4989
USB 2.0 Hi-Speed 2-of-4 Crosspoint Switch
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(VCC= +2.7V to +5.5V, TA= -40°C to +85°C, unless otherwise noted. Typical values are at VCC= +3.3V, TA= +25°C.) (Note 2)
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.
Note 1: Package thermal resistances were obtained using the method described in JEDEC specification JESD51-7, using a 4-layer
board. For detailed information on package thermal considerations, refer to www.maxim-ic.com/thermal-tutorial
.
(Voltages referenced to GND.)
V
CC
....................................................................... -0.3V to +6.0V
C_ ......................................................................... -0.3V to +6.0V
W_, X_, Y_, Z_ ........................................... -0.3V to (V
CC
+ 0.3V)
Continuous Current C_ .................................................... ±30mA
Continuous Current W_, X_, Y_, Z_................................ ±120mA
Peak Current W_, X_, Y_, Z_
(pulsed at 1ms, 10% duty cycle) .............................. ±240mA
Continuous Power Dissipation (T
A
= +70°C)
14-Pin TDFN (derate 24.4mW/°C above +70°C) ..... 1951mW
Junction-to-Case Thermal Resistance (Θ
JC
) (Note 1)
14-Pin TDFN ................................................................. 8°C/W
Junction-to-Ambient Thermal Resistance (Θ
JA
) (Note 1)
14-Pin TDFN ............................................................... 41°C/W
Operating Temperature Range ......................... -40°C to +85°C
Junction Temperature .................................................... +150°C
Storage Temperature Range ........................... -65°C to +150°C
Lead Temperature (soldering, 10s) ................................+300°C
)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Operating Power-Supply Range V
Supply Current I
Shutdown Supply Current I
Analog Signal Range
On-Resistance R
On-Resistance Match Between
Channels
On-Resistance Flatness R
Off-Leakage Current I
On-Leakage Current I
SHDN
V
W_
V
Y_,VZ_
ΔR
IN(OFF
IN(ON)
CC
CC
, VX_,
ON
ON
FLAT
Switch enabled
C1 = C2 = C3 = GND or V
VIN = +3.0V, I
= 10mA (Note 3) 5 9 Ω
OUT
VCC = +3.3V 1 3.5
= +5.5V 3 6.5
V
CC
CC
VCC = +3.3V, VIN = +1.5V,
= 10mA (Note 3)
I
OUT
VCC = +3.3V, VIN = 0V to VCC,
= 10mA (Notes 3, 4, 5)
I
OUT
VCC = +5.5V, VIN = 0V or VCC, V
or 0V or unconnected (Note 3)
VCC = +5.5V, VIN = 0V or VCC, V
unconnected (Note 3)
OUT
OUT
= V
=
AC PERFORMANCE (Note 4)
On-Channel -3dB Bandwidth BW RL = RS = 50Ω, VIN = 0dBm, Figure 1 1 GHz
Insertion Loss S
Off-Isolation (Note 3) Figure 1 V
Crosstalk V
ISO
CT
RL = RS = 50Ω, f = 10MHz 0.5 dB
12
f = 10MHz, VIN = 0dBm, RL = RS = 50Ω -43
f = 250MHz, VIN = 0dBm, RL = RS = 50Ω -15
f = 50MHz, VIN = 0dBm, RL = RS = 50Ω,
between adjacent pairs (Note 3), Figure 1
2.7 5.5 V
0V
CC
-1 +1 µA
-1 +1 µA
0.1 0.5 µA
CC
0.5 Ω
0.4 Ω
-50 dB
µA
V
dB
MAX4989
USB 2.0 Hi-Speed 2-of-4 Crosspoint Switch
_______________________________________________________________________________________ 3
Note 2: All devices are 100% production tested at TA= +25°C. All temperature limits are guaranteed by design.
Note 3: IN and OUT refer to input and output terminals (W_, X_, Y_, Z_) of any switch configuration.
Note 4: Not production tested. Guaranteed by design.
Note 5: Flatness is defined as the difference between the maximum and minimum value of on-resistance, as measured over specified
analog signal ranges.
ELECTRICAL CHARACTERISTICS (continued)
(VCC= +2.7V to +5.5V, TA= -40°C to +85°C, unless otherwise noted. Typical values are at VCC= +3.3V, TA= +25°C.) (Note 2)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
DYNAMIC (Note 4)
Turn-On Time t
Turn-Off Time t
Propagation Delay t
Output Skew Between Switches t
PLH
SK(O)
Output Skew Same Switch t
Off-Capacitance C
On-Capacitance C
LOGIC INPUTS
Input Logic High V
Input Logic Low V
Input Logic Hysteresis V
Input Leakage Current I
ON
OFF
, t
SK(P)
OFF
ON
IH
IL
HYST
IN
VIN = +1.5V, RL = 300Ω, CL = 35pF,
= 0V to VCC, Figure 2
V
C_
VIN = +1.5V, RL = 300Ω, CL = 35pF,
= 0V to VCC, Figure 2
V
C_
PHLRL
= RS = 50Ω, Figure 3 120 ps
RL = RS = 50Ω, Figure 3 50 ps
RL = RS = 50Ω, Figure 3 50 ps
f = 1MHz, V
f at -3dB = 240MHz, V
V
= 0.5V
IN
f = 1MHz, V
f at -3dB = 240MHz, V
= 0.5V
V
IN
= 0V, VIN = 0.5V
BIAS
P-P
= 0V, VIN = 0.5V
BIAS
P-P
BIAS
BIAS
P-P
= 0V,
P-P
= 0V,
1.7 V
VCC = +5.5V, VC_= GND or V
CC
-1 +1 µA
15 100 µs
26µs
13.5
4
6pF
0.5 V
75 mV
pF
MAX4989
USB 2.0 Hi-Speed 2-of-4 Crosspoint Switch
4 _______________________________________________________________________________________
Test Circuits/Timing Diagrams
Figure 1. On-Loss, Off-Isolation, and Crosstalk
Figure 2. Switching Time
OFF-ISOLATION = 20log
ON-LOSS = 20log
CROSSTALK = 20log
0V OR V
CC
50Ω
IN, OUT, AND OFF DEPEND ON SWITCH CONFIGURATION.
MEASUREMENTS ARE STANDARDIZED AGAINST SHORTS AT IC TERMINALS.
OFF-ISOLATION IS MEASURED BETWEEN IN AND OFF TERMINAL ON EACH SWITCH.
ON-LOSS IS MEASURED BETWEEN IN AND OUT TERMINAL ON EACH SWITCH.
CROSSTALK IS MEASURED FROM ONE CHANNEL TO THE OTHER CHANNEL.
SIGNAL DIRECTION THROUGH SWITCH IS REVERSED; WORST VALUES ARE RECORDED.
C_
OFF
MAX4989
OUT
NETWORK
ANALYZER
V
IN
IN
V
OUT
50Ω
MEAS REF
50Ω 50Ω
50Ω
V
OUT
V
IN
V
OUT
V
IN
V
OUT
V
IN
MAX4989
OUT
L
)
ON
LOGIC
INPUT
IN
V
N_
C_
C
INCLUDES FIXTURE AND STRAY CAPACITANCE.
L
V
OUT
RL + R
= V
IN (
R
V
LOGIC
INPUT
V
OUT
R
L
C
L
SWITCH
OUTPUT
IH
V
IL
0V
50%
V
OUT
0.9 x V
0UT
t
ON
IN AND OUT DEPEND ON SWITCH CONFIGURATION.
tr < 5ns
tf < 5ns
t
OFF
0.9 x V
OUT
MAX4989
USB 2.0 Hi-Speed 2-of-4 Crosspoint Switch
_______________________________________________________________________________________ 5
Test Circuits/Timing Diagrams (continued)
Figure 3. Output Signal Skew, Rise/Fall Time, Propagation Delay
MAX4989
R
S
V
IN+
R
V
IN-
IN+
S
IN-
C_
V+
V
IN+
50%
0V
VIL TO V
OUT+
OUT-
IH
50%
V
OUT+
t
= t
PLH
PLHX
t
= t
PHL
PHLX
t
R
L
V
OUT-
R
L
t
INRISE
= |t
SK(0)
= |t
t
SK(P)
IN AND OUT DEPEND ON SWITCH
CONFIGURATION
90%
10% 10%
PLHX
PLHX
OR t
OR t
PLHY
PHLY
- t
| OR |t
- t
t
INFALL
|
PHLY
- t
|
PHLY
PLHY
PHLX
| OR |t
PHLX
PLHY
- t
90%
V
CC
V
IN-
50%
50%
0V
V
OUT+
t
V
PLHX
CC
50%
t
PHLX
0V
V
CC
V
OUT-
50%
0V
t
PHLY
t
PLHY
50%
50%
t
OUTRISE
90%
90%
10% 10%
t
OUTFALL
MAX4989
USB 2.0 Hi-Speed 2-of-4 Crosspoint Switch
6 _______________________________________________________________________________________
Typical Operating Characteristics
(VCC= +3.3V, TA= +25°C, unless otherwise noted.)
2.0
3.5
2.5
3.0
4.5
4.0
5.5
5.0
6.0
024
ON-RESISTANCE
vs. INPUT VOLTAGE
MAX4989 toc01
INPUT VOLTAGE (V)
ON-RESISTANCE (Ω)
I
OUT
= 10mA
VCC = 2.7V
VCC = 5.5V
2.0
2.5
3.0
3.5
4.0
4.5
5.0
5.5
6.0
0123
ON-RESISTANCE
vs. INPUT VOLTAGE
MAX4989 toc02
INPUT VOLTAGE (V)
ON-RESISTANCE (Ω)
I
OUT
= 10mA
TA = +85°C TA = +25°C TA = -40°C
-20
20
0
60
40
80
100
-40 85
LEAKAGE CURRENT
vs. TEMPERATURE
MAX4989 toc03
TEMPERATURE (°C)
LEAKAGE CURRENT (nA)
10-15 35 60
ON-LEAKAGE
OFF-LEAKAGE
VIN = V
CC
V
OUT
= UNCONNECTED
750
780
770
760
790
800
810
820
830
840
850
-40 10-15 35 60 85
SUPPLY CURRENT
vs. TEMPERATURE
MAX4989 toc04
TEMPERATURE (°C)
SUPPLY CURRENT (nA)
SWITCH ENABLED
0.5
0.8
0.7
0.6
0.9
1.0
1.1
1.2
1.3
1.4
1.5
2.7 4.13.4 4.8 5.5
MAX4989 toc05
SUPPLY VOLTAGE (V)
LOGIC THRESHOLD (V)
INPUT LOGIC THRESHOLD
vs. SUPPLY VOLTAGE
V
IH
V
IL
10
-70
10 100 1000
FREQUENCY RESPONSE
-50
-60
FREQUENCY (MHz)
MAGNITUDE (dB)
-30
-40
-20
-10
0
OFF-ISOLATION
CROSSTALK
ON-LOSS
MAX4989 toc06
Pin Descriptions
Detailed Description
The MAX4989 is a USB 2.0 bidirectional crosspoint
switch that allows the user to connect any 2 of 4 USB
pairs. The device operates from a single +2.7V to
+5.5V supply and features an internal charge pump
to permit the full rail-to-rail swing necessary for USB
low-/full-/Hi-Speed applications with data rates up to
480Mbps.
Control Logic Inputs
The MAX4989 provides three control logic inputs, C0,
C1, and C2, to control the switch connections as
shown in the
Functional Diagram/Truth Table
. Driving
the control logic inputs rail-to-rail minimizes power
consumption.
Shutdown Mode
The MAX4989 features a shutdown mode that reduces
the supply current to less than 0.5µA and places all
switch terminals in high impedance. Drive all control
inputs high or all control inputs low to place the device in
shutdown mode (see
Functional Diagram/Truth Table.
)
USB Switching
The low on-resistance and low on-capacitance of the
MAX4989 make it ideal for high-performance Hi-Speed
USB 2.0 switching applications. The MAX4989 is ideal
for routing USB data lines and for applications that
require switching between multiple USB hosts or
devices (Figure 4).
Layout
Hi-Speed USB requires careful PCB layout with controlled-impedance matched traces of equal lengths.
Ensure that bypass capacitors are as close as possible
to the device. Use large ground planes where possible.
Power-Supply Sequencing
Caution: Do not exceed the absolute maximum ratings because stresses beyond the listed ratings
may cause permanent damage to the device.
Proper power-supply sequencing is recommended for
all devices. Always apply VCCbefore applying signals,
especially if the signal is not current limited.
Chip Information
PROCESS: BiCMOS
MAX4989
USB 2.0 Hi-Speed 2-of-4 Crosspoint Switch
_______________________________________________________________________________________ 7
PIN NAME FUNCTION
1 Y- Inverting Input/Output of Terminal Y
2 Y+ Noninverting Input/Output of Terminal Y
3 GND Ground
4 Z+ Noninverting Input/Output of Terminal Z
5 Z- Inverting Input/Output of Terminal Z
6 C0 Control Input 0
7 C1 Control Input 1
8 C2 Control Input 2
9V
10 X- Inverting Input/Output of Terminal X
11 X+ Noninverting Input/Output of Terminal X
12 GND Ground
13 W+ Noninverting Input/Output of Terminal W
14 W- Inverting Input/Output of Terminal W
—EP
Positive Supply Voltage Input. Bypass VCC to GND with a 0.1µF ceramic capacitor as close as possible to
CC
the device.
Exposed Pad. EP can be connected to GND or left unconnected. EP is not intended as an electrical
connection point.
MAX4989
USB 2.0 Hi-Speed 2-of-4 Crosspoint Switch
Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are
implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.
8
_____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600
© 2008 Maxim Integrated Products is a registered trademark of Maxim Integrated Products, Inc.
Figure 4. Typical Application Circuit
Functional Diagram/Truth Table
Package Information
For the latest package outline information and land patterns, go
to www.maxim-ic.com/packages
.
PACKAGE TYPE PACKAGE CODE DOCUMENT NO.
14 TDFN T1433-2
21-0137
Applications Information
Y+
Z+
Y-
Z+
C2 C1 C0
0 0 0 SHUTDOWN
0 0 1 W AND X CONNECTED
0 1 0 W AND Y CONNECTED
0 1 1 W AND Z CONNECTED
1 0 0 X AND Z CONNECTED
1 0 1 X AND Y CONNECTED
1 1 0 Y AND Z CONNECTED
1 1 1 SHUTDOWN
V
CC
MAX4989
CONTROL LOGIC
C1 GNDC2 C0
MAX4989
SWITCH
+3.3V
0.1μF
D+
USB
TRANSCEIVER
W+
X+
W-
X+
TRANSCEIVER
USB
D-
A
D+
D-
B
Y+
Y-
Z+
Z-
MAX4989
GPIO CONTROL
V
CC
W+
W-
X+
X-
GNDC1 C2C0
D+
D-
D+
D-
USB
PERIPHERAL
1
USB
PERIPHERAL
2
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