MAXIM MAX4907

19-3797; Rev 2; 1/07
High-/Full-Speed USB 2.0 Switches
The MAX4906/MAX4906F/MAX4907/MAX4907F analog
switches combine the low on-capacitance (CON) and
low on-resistance (R ON ) necessary for high-performance switching applications. These devices are
designed for USB 2.0 high-speed applications at
480Mbps. These switches will also handle all the
requirements for USB low- and full-speed signaling.
The MAX4906/MAX4906F feature two single-pole/double-throw (SPDT) switches, and the MAX4907/
MAX4907F feature two single-pole/single-throw switches
(SPST). The MAX4907/MAX4907F have a low 7Ω (max)
on-resistance and 7pF (max) on-capacitance. These
devices are fully specified to operate from a single
+3.0V to +3.6V power supply and are protected against
a +5.5V short to COM1 and COM2. This feature makes
them fully compliant with the USB 2.0 specification of
+5.5V fault protection. These devices feature a low
threshold voltage and a +1.4V VIH, permitting them to
be used with low-voltage logic. The MAX4906/
MAX4906F/MAX4907/MAX4907F operate at 300µA
(max) quiescent current and feature a shutdown input
to reduce the quiescent current to less than 2µA (max).
The MAX4906/MAX4906F/MAX4907/MAX4907F are available in space-saving, 2mm x 2mm µDFN packages and
operate over a -40°C to +85°C temperature range.
Applications
Cell Phones
PDAs
Digital Still Cameras
GPS
Notebook Computers
Relay Replacements
USB Switching
Ethernet Switching
Video Switching
Bus Switches
T3/E3 Switches for
Redundancy Protection
Features
♦ Fully Specified for a Single +3.0V to +3.6V
Power-Supply Voltage
♦ Low 4Ω (typ), 7Ω (max) On-Resistance (RON)
♦ MAX4907/MAX4907F Ultra-Low 4pF (typ),
7pF (max) On-Capacitance (CON)
♦ -3dB Bandwidth: 1GHz (typ)
♦ Low Bit-to-Bit Skew ≤ 100ps
♦ Shutdown Input Reduces Power Consumption
to 2µA (max)
♦ 3.3V, 1.8V, and 1.4V Logic Compatible
♦ COM_ Analog Inputs Fault Protected Against
Shorts to USB Supply Rail Up to +5.5V
♦ Space-Saving Packages
8-Pin and 10-Pin, 2mm x 2mm µDFN Packages
Ordering Information
PART
PIN-PACKAGE
PKG CODE
MAX4906ELB
10 µDFN
L1022-1
MAX4906FELB
10 µDFN
L1022-1
MAX4907ELA
8 µDFN
L822-1
MAX4907FELA
8 µDFN
L822-1
Note: All devices operate over the -40°C to +85°C operating
temperature range.
Selector Guide appears at end of data sheet.
Pin Configurations
Typical Operating Characteristics
EYE DIAGRAM
VNO1OUT
V+ =3.3V
IBIAS = 9mA
f = 240MHz
USB 2.0
HIGH SPEED
TRANSMIT
TEMPLATE
100mV/div
TOP VIEW
IN
1
10
V+
SHDN/EN
2
9
NC1
GND
3
8
NC2
COM1
4
COM2
5
MAX4906
MAX4906F
7
NO1
6
NO2
μDFN
VNO2OUT
500ps/div
Pin Configurations continued at end of data sheet.
________________________________________________________________ Maxim Integrated Products
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
1
MAX4906/MAX4606F/MAX4907/MAX4907F
General Description
MAX4906/MAX4606F/MAX4907/MAX4907F
High-/Full-Speed USB 2.0 Switches
ABSOLUTE MAXIMUM RATINGS
Voltages Referenced to GND
V+ .............................................................................-0.3V to +4V
IN, SHDN, SHDN/EN (Note 1) ......................-0.3V to (V+ + 0.3V)
COM_, NO_, NC_ ..................................................-0.5V to +5.5V
Continuous Current (COM_ to NO_/NC_) ......................±120mA
Peak Current, (COM_ to NO_/NC_)
(pulsed at 1ms 10% duty cycle).................................±240mA
Continuous Power Dissipation (TA = +70°C)
8-Pin µDFN (derate 5.0mW/°C above +70°C) .............400mW
10-Pin µDFN (derate 5.3mW/°C above +70°C) ........423.7mW
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
Note 1: Signals on IN, SHDN or SHDN/EN exceeding V+ or GND are clamped by internal diodes. Limit forward-diode current to
maximum current rating.
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+ = +3V to +3.6V, TA = TMIN to TMAX, unless otherwise noted. Typical values are at V+= 3.3V, TA = +25°C.) (Note 2)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
V+
V
4.0
V
ANALOG SWITCH
Analog Signal Range
Fault-Protection Trip Threshold
On-Resistance
On-Resistance During Shutdown
On-Resistance Match Between
Channels
VCOM_,VNO_,
SHDN or SHDN/EN = 0 (Note 3)
VNC_
VFP
RON
RONSH
ΔRON
0
3.6
ICOM_ = -40mA,
0V ≤ VCOM_≤ V+,
SHDN or SHDN/EN = 0
TA = +25°C
ICOM_ = -40mA,
0V ≤ VCOM_ ≤ 1.5V,
SHDN = V+
(MAX4907/MAX4907F)
TA = +25°C
V+ = 3.0V,
ICOM_= -40mA,
VCOM_ = 1.5V (Note 4)
4
TA = TMIN to TMAX
7
8
4
Ω
10
Ω
TA = TMIN to TMAX
13
TA = +25°C
0.7
1.2
Ω
TA = TMIN to TMAX
1.5
On-Resistance Flatness
RFLAT (ON)
V+ = 3.0V, ICOM_ = -40mA,
VCOM_ = 1.5V, 3.0V (Note 5)
Off-Leakage Current
ICOM_(OFF)
V+ = 3.6V, VCOM_ = 0.3V, 3.3V;
VNO_ or VNC_ = 3.3V, 0.3V
-1
+1
µA
On-Leakage Current
ICOM_(ON)
V+ = 3.6V, VCOM = 0.3V, 3.3V;
VNO_ or VNC_ = 0.3V, 3.3V, or floating
-1
+1
µA
Ω
1.0
SWITCH AC PERFORMANCE
On-Channel -3dB Bandwidth
Off-Isolation
2
BW
VISO
RL = RS = 50Ω, signal = 0dBm, Figure 1
1000
f = 10MHz; VNO_, VNC_ = 1VP-P;
RL = RS = 50Ω, Figure 1
-60
f = 250MHz; VNO_, VNC_ = 1VP-P;
RL = RS = 50Ω, Figure 1
-32
f = 500MHz; VNO_, VNC_ = 1VP-P;
RL = RS = 50Ω, Figure 1
-26
_______________________________________________________________________________________
MHz
dB
High-/Full-Speed USB 2.0 Switches
(V+ = +3V to +3.6V, TA = TMIN to TMAX, unless otherwise noted. Typical values are at V+ = 3.3V, TA = +25°C.) (Note 2)
PARAMETER
Crosstalk (Note 6)
SYMBOL
VCT
CONDITIONS
MIN
TYP
f = 10MHz; VNO_, VNC_ = 1VP-P;
RL = RS = 50Ω, Figure 1
-59
f = 250MHz; VNO_, VNC_ = 1VP-P;
RL = RS = 50Ω, Figure 1
-31
f = 500MHz; VNO_, VNC_ = 1VP-P;
RL = RS = 50Ω, Figure 1
-25
MAX
UNITS
dB
SWITCH DYNAMICS
NO_, NC_ Off-Capacitance
Switch On-Capacitance
Switch On-Capacitance Matching
C(OFF)
C(ON)
CONM
f = 1MHz, Figure 2 (Note 7)
f = 1MHz, Figure 2
(Note 7)
2
4
MAX4906ELB,
MAX4906FELB
6
9
MAX4907ELA,
MAX4907FELA
4
7
MAX4906ELB,
MAX4906FELB
0.4
MAX4907ELA,
MAX4907FELA
0.3
pF
pF
pF
f = 1MHz (Note 7)
Turn-On Time
tON
VNO_, VNC_ = 1.5V; RL = 300Ω, CL = 35pF,
VIH = V+, VIL = 0V, SHDN or SHDN/EN = 0V,
Figure 3
60
ns
Turn-Off Time
tOFF
VNO_, VNC_ = 1.5V; RL = 300Ω, CL = 35pF,
VIH = V+, VIL = 0V, SHDN or SHDN/EN = 0V,
Figure 3; TA = +25°C
30
ns
Propagation Delay
tPLH_,tPHL
RL = RS = 50Ω, Figure 4
0.25
ns
Fault-Protection Response Time
tFP
VCOM_ = 0 to 5V step,
RL = RS = 50Ω, Figure 5
3.0
µs
Fault-Protection Recovery Time
tFPR
VCOM_ = 5V to 3V step,
RL = RS = 50Ω, Figure 5
2
µs
Output Skew Between Switches
tSK(o)
Skew between switch 1 and switch 2, RL =
RS = 50Ω, Figure 4 (Note 7)
50
100
ps
Output Skew Same Switch
tSK(p)
Skew between opposite transitions in same
switch, RL = RS = 50Ω, Figure 4 (Note 7)
50
100
ps
_______________________________________________________________________________________
3
MAX4906/MAX4606F/MAX4907/MAX4907F
ELECTRICAL CHARACTERISTICS (continued)
ELECTRICAL CHARACTERISTICS (continued)
(V+ = +3V to +3.6V, TA = TMIN to TMAX, unless otherwise noted. Typical values are at V+ = 3.3V, TA = +25°C.) (Note 2)
PARAMETER
SYMBOL
Total Harmonic Distortion Plus
Noise
CONDITIONS
MIN
TYP
MAX
UNITS
THD+N
VCOM_ = 2VP-P, RL = 600Ω, f = 20Hz to
20kHz
0.03
%
Q
VGEN = 1.5V, RGEN = 0Ω, CL = 100pF,
Figure 6
5
pC
Charge Injection
SWITCH LOGIC
Logic-Input-Voltage Low
VIL
Logic-Input-Voltage High
VIH
Input-Logic Hysteresis
0.4
V
1.1
V
VHYST
100
Input Leakage Current
IIN
Operating Supply-Voltage Range
V+
Quiescent Supply Current
I+
V+ = 3.6V, VIN = 0 or V+, SHDN or
SHDN/EN = 0
Quiescent Supply Current During
Shutdown
I+
V+ = 3.6V, VIN = 0 or V+, SHDN or
SHDN/EN = V+
V+ = 3.6V, VIN = 0 or V+
mV
-1
+1
µA
3.0
3.6
V
300
µA
2
µA
120
Note 2: All units are 100% production tested at TA = +25°C. Limits over the operating temperature range are guaranteed by design
and not production tested.
Note 3: The switch will turn off for voltages above (VFP); therefore, protecting downstream circuits in case of a fault condition
(MAX4906F/MAX4907F).
Note 4: ΔRON(MAX) = | RON(CH1) – RON(CH2) |
Note 5: Flatness is defined as the difference between the maximum and minimum value of on-resistance, as measured over
specified analog signal ranges.
Note 6: Between any two switches.
Note 7: Switch off-capacitance, switch on-capacitance, output skew between switches, and output skew same-switch limits are not
production tested; design guaranteed by bench characterization.
Typical Operating Characteristics
(TA = +25°C, unless otherwise noted.)
ON-RESISTANCE vs. VCOM
4
TA = +85°C
4
RON (Ω)
V+ = 3.6V
3
TA = +25°C
3
2
2
1
1
0
0
TA = +40°C
MAX4906 toc03
V+ = 3.3V
5
LEAKAGE CURRENT vs. TEMPERATURE
5000
MAX4906 toc02
5
MAX4906 toc01
V+ = 3.3V
V+ = 3.0V
6
V+ = 3.6V
4500
4000
LEAKAGE CURRENT (pA)
ON-RESISTANCE vs. VCOM
6
RON (Ω)
MAX4906/MAX4606F/MAX4907/MAX4907F
High-/Full-Speed USB 2.0 Switches
3500
COM ON-LEAKAGE
3000
COM OFF-LEAKAGE
2500
2000
1500
1000
500
0
0.9
1.8
VCOM (V)
4
2.7
3.6
0
0
1.1
2.2
VCOM (V)
3.3
-40
-15
10
35
TEMPERATURE (°C)
_______________________________________________________________________________________
60
85
High-/Full-Speed USB 2.0 Switches
QUIESCENT SUPPLY CURRENT
vs. TEMPERATURE
CHARGE INJECTION (pC)
6
4
2
140
V+ = 3.6V
120
100
V+ = 3.0V
80
60
40
150
MAX4906 toc06
8
160
MAX4906 toc05
CL = 100pF
V+ = 3.3V
QUIESCENT SUPPLY CURRENT (μA)
MAX4906 toc04
10
QUIESCENT SUPPLY CURRENT
vs. LOGIC LEVEL
QUIESCENT SUPPLY CURRENT (μA)
CHARGE INJECTION vs. VCOM
V+ = 3.3V
140
130
120
110
20
0
1.1
2.2
3.3
-15
10
35
60
0
85
1.1
2.2
TEMPERATURE (°C)
LOGIC LEVEL (V)
LOGIC THRESHOLD vs. SUPPLY VOLTAGE
TURN-ON/OFF TIME
vs. SUPPLY VOLTAGE
TURN-ON/OFF TIME
vs. TEMPERATURE
MAX4906 toc09
40
V+ = 3.3V
40
VIL
0.4
tON
tON/tOFF (ns)
tON/tOFF (ns)
tON
0.6
3.3
50
MAX4906 toc08
50
MAX4906 toc07
VIH
0.8
30
20
30
20
tOFF
tOFF
10
10
O
O
3.0
3.2
3.4
0
3.0
3.6
3.2
3.4
3.6
SUPPLY VOLTAGE (V)
SUPPLY VOLTAGE (V)
RISE/FALL-TIME PROPAGATION DELAY
vs. SUPPLY VOLTAGE
RISE/FALL-TIME PROPAGATION DELAY
vs. TEMPERATURE
TPLH
230
220
TPHL
210
200
V+ = 3V
240
230
TPHL
3.2
3.4
SUPPLY VOLTAGE (V)
3.6
60
85
10
0
-5
210
200
3..0
35
5
TPLH
220
10
SAME SWITCH OUTPUT SKEW
vs. SUPPLY VOLTAGE
OUTPUT SKEW (ps)
240
-15
TEMPERATURE (°C)
250
OUTPUT RISE/FALL -TIME DELAY (ps)
MAX4906 toc10
250
-40
XMAX4906 toc12
0.2
MAX4906 toc11
LOGIC THRESHOLD (V)
-40
VCOM (V)
1
OUTPUT RISE/FALL -TIME DELAY (ps)
100
0
0
-10
-40
-15
10
35
TEMPERATURE (°C)
60
85
3.0
3.2
3.4
3.6
SUPPLY VOLTAGE (V)
_______________________________________________________________________________________
5
MAX4906/MAX4606F/MAX4907/MAX4907F
Typical Operating Characteristics (continued)
(TA = +25°C, unless otherwise noted.)
Typical Operating Characteristics (continued)
(TA = +25°C, unless otherwise noted.)
OUTPUT SKEW BETWEEN SWITCHES
vs. SUPPLY VOLTAGE
FREQUENCY RESPONSE
MAX4906 toc13
0
MAX4906 toc13
10
-10
ON-LOSS
-20
5
-30
ON-LOSS (dB)
OUTPUT SKEW (ps)
0
CROSS-TALK
-40
-50
-60
-70
-5
OFF-ISOLATION
-80
-90
-100
-10
3.0
3.2
1
3.6
3.4
10
100
1000
FREQUENCY (MHz)
SUPPLY VOLTAGE (V)
TOTAL HARMONIC DISTORTION
PLUS NOISE vs. FREQUENCY
MAX4906 toc15
1
V+ = 3.3V
RL = 600Ω
THD+N (%)
MAX4906/MAX4606F/MAX4907/MAX4907F
High-/Full-Speed USB 2.0 Switches
0.1
0.01
10
100
1k
10k
100k
FREQUENCY (Hz)
6
_______________________________________________________________________________________
High-/Full-Speed USB 2.0 Switches
PIN
MAX4906/ MAX4907/
MAX4906F MAX4907F
NAME
FUNCTION
1
8
IN
2
—
SHDN/EN
3
2
GND
4
3
COM1
Analog Switch 1—Common Terminal
5
4
COM2
Analog Switch 2—Common Terminal
6
5
NO2
Analog Switch 2—Normally Open Terminal
7
6
NO1
Analog Switch 1—Normally Open Terminal
8
—
NC2
Analog Switch 2—Normally Closed Terminal
9
—
NC1
10
7
V+
—
1
SHDN
Digital Control Input. IN controls switch 1 and switch 2.
Shutdown and Enable Input. Drive SHDN/EN high to consume minimum current and to put the
device in high-impedance mode. Drive the SHDN/EN low for normal operation.
Ground
Analog Switch 1—Normally Closed Terminal
Positive-Supply Voltage Input. Connect V+ to a 3.0V to 3.6V supply voltage. Bypass V+ to
GND with a 0.1µF capacitor.
Shutdown Input. Drive SHDN high to put the device into shutdown mode. For normal
operation, drive SHDN low.
Test Circuits/Timing Diagrams
+3.3V 10nF
V
OFF-ISOLATION = 20log OUT
VIN
NETWORK
ANALYZER
0V OR V+
IN_
V+
COM1
50Ω
VIN
V
ON-LOSS = 20log OUT
VIN
50Ω
MAX4906/MAX4906F
NC1 MAX4907/MAX4907F
NO1*
50Ω
VOUT
MEAS
50Ω
REF
V
CROSSTALK = 20log OUT
VIN
50Ω
GND
MEASUREMENTS ARE STANDARDIZED AGAINST SHORTS AT IC TERMINALS.
OFF-ISOLATION IS MEASURED BETWEEN COM_ AND "OFF" NO_ OR NC_ TERMINAL ON EACH SWITCH.
ON-LOSS IS MEASURED BETWEEN COM_ AND "ON" NO_ OR NC_ TERMINAL ON EACH SWITCH.
CROSSTALK IS MEASURED FROM ONE CHANNEL TO THE OTHER CHANNEL.
SIGNAL DIRECTION THROUGH SWITCH IS REVERSED; WORST VALUES ARE RECORDED.
*FOR CROSSTALK THIS PIN IS NO2.
NC2 AND COM2 ARE OPEN.
Figure 1. On-Loss, Off-Isolation, and Crosstalk
_______________________________________________________________________________________
7
MAX4906/MAX4606F/MAX4907/MAX4907F
Pin Description
MAX4906/MAX4606F/MAX4907/MAX4907F
High-/Full-Speed USB 2.0 Switches
Test Circuits/Timing Diagrams (continued)
10nF
V+
V+
COM_
MAX4906/MAX4906F
MAX4907/MAX4907F
IN
CAPACITANCE
METER
VIL OR VIH
NC_ or
NO_
f = 1MHz
GND
Figure 2. Channel Off/On-Capacitance
MAX4906/MAX4906F
MAX4907/MAX4907F
V+
V+
COM_
NO_
OR NC_
VN_
LOGIC
INPUT
50%
VIL
VOUT
RL
t OFF
CL
IN
VOUT
GND
LOGIC
INPUT
SWITCH
OUTPUT
CL INCLUDES FIXTURE AND STRAY CAPACITANCE.
RL
VOUT = VN_
RL + RON
(
)
t r < 5ns
t f < 5ns
VIH
0.9 x V0UT
t ON
IN DEPENDS ON SWITCH CONFIGURATION;
INPUT POLARITY DETERMINED BY SENSE OF SWITCH.
Figure 3. Switching Time
8
0.9 x VOUT
0V
_______________________________________________________________________________________
High-/Full-Speed USB 2.0 Switches
RS
IN+
NC1 OR
NO1
MAX4906/MAX4906F
MAX4907/MAX4907F
COM1
OUT+
RISE-TIME PROPAGATION DELAY = tPHLX OR tPHLY
FALL-TIME PROPAGATION DELAY = tPHLX OR tPHLY
tSK(O) = |tPHLX - tPHLY| OR |tPHLX - tPHLY|
tSK(P) = |tPHLX - tPHLX| OR |tPHLY - tPHLY|
RL
RS
IN-
NC2 OR
NO2
COM2
OUTRL
IN
IN
VIL TO VIH
tINFALL
tINRISE
V+
90%
VIN+
90%
50%
50%
10%
0V
10%
V+
VIN-
50%
50%
0V
tOUTRISE
tPLHX
tOUTFALL
tPHLX
V+
90%
VOUT+
90%
50%
50%
10%
0V
10%
V+
50%
VOUT-
50%
0V
tPHLY
tPLHY
Figure 4. Output Signal Skew, Rise/Fall Time, Propagation Delay
_______________________________________________________________________________________
9
MAX4906/MAX4606F/MAX4907/MAX4907F
Test Circuits/Timing Diagrams (continued)
MAX4906/MAX4606F/MAX4907/MAX4907F
High-/Full-Speed USB 2.0 Switches
Test Circuits/Timing Diagrams (continued)
5V
2.5V
3V
VCOM_
0V
tPF
tFPR
VPF
3V
2.5V
VNO_
1.5V
VNC_
0V
Figure 5. MAX4906F/MAX4907F Fault-Protection Response/Recovery Time
V+
MAX4906/MAX4906F
MAX4907/MAX4907F
ΔVOUT
V+
RGEN
VOUT
COM_
NC_
OR NO_
VOUT
IN
OFF
CL
V GEN
GND
ON
OFF
IN
VIL TO VIH
IN
OFF
ON
OFF
Q = (ΔV OUT )(C L )
LOGIC INPUT WAVEFORMS INVERTED FOR SWITCHES
THAT HAVE THE OPPOSITE LOGIC SENSE.
Figure 6. Charge Injection
Detailed Description
The MAX4906/MAX4906F/MAX4907/MAX4907F analog
switches are targeted for USB 2.0 high-speed
(480Mbps) switching applications. These devices still
meet USB low- and full-speed requirements and are
suitable for 10/100 Ethernet switching. The MAX4906/
MAX4906F feature two SPDT switches, while the
MAX4907/MAX4907F feature two SPST switches. The
MAX4907/MAX4907F switch configurations have a low
7Ω (max) on-resistance and 7pF (max) on-capacitance.
10
The MAX4906/MAX4906F/MAX4907/MAX4907F are fully
specified to operate from a single +3.0V to +3.6V supply
and are available with +5.5V fault protection (MAX4906F/
MAX4907F). When operating from a +3.0V to +3.6V supply, the low threshold of these devices permits them to
be used with logic levels as low as 1.4V.The
MAX4906/MAX4906F/MAX4907/MAX4907F are based
on a charge-pump-assisted n-channel architecture and
thus operate at 300µA (max) quiescent current. These
devices all feature a shutdown input to reduce the quiescent current to less than 2µA (max).
______________________________________________________________________________________
High-/Full-Speed USB 2.0 Switches
V+
V+
SHDN/EN
SHDN
MAX4907/MAX4907F
MAX4906/MAX4906F
IN
IN
NO1
COM1
NO1
COM1
COM2
NO2
COM2
NC1
NO2
NC2
GND
GND
MAX4907/MAX4907F
MAX4906/MAX4906F
SHDN/EN
IN
NO1
NO2
NC1
NC2
SHDN
IN
COM1- NO1
COM2- NO1
OFF
0
0
OFF
ON
0
0
0
1
ON
OFF
0
1
ON
1
x
OFF
OFF
1
0
OFF
1
1
ON
Digital Control Input
Shutdown Mode
The MAX4906/MAX4906F/MAX4907/MAX4907F provide
a single-digit control logic input, IN. IN controls the
position of the switches as shown in the Functional
Diagram/Truth Table. Driving IN rail-to-rail minimizes
power consumption. With a +3.0V to +3.6V supply voltage range, these devices are +1.4V logic compatible.
The MAX4906/MAX4906F feature a shutdown mode
that reduces the quiescent current supply to less than
2µA. Drive SHDN/EN high to place the devices in highimpedance mode. When SHDN/EN is driven low, the
devices are normal in operation.
The MAX4907/MAX4907F feature a SHDN input that
reduces the quiescent current supply to less than 2µA.
Drive SHDN high to place the devices in low current
mode. The devices can be used in low current mode, but
with a reduced analog voltage range of 0 < VANALOG <
1.5V and reduced performance. When SHDN is driven
low, the MAX4907/MAX4907F are in normal operation.
Analog Signal Levels
The on-resistance of the MAX4906/MAX4906F/
MAX4907/MAX4907F is very low and stable as the analog input signals are swept from ground to V+ (see the
Typical Operating Characteristics). These switches are
bidirectional, allowing NO_, NC_, and COM_ to be configured as either inputs or outputs.
Applications Information
Overvoltage Fault Protection
USB Switching
The MAX4906F and MAX4907F feature +5.5V fault protection to COM1 and COM2. Fault protection prevents
these switches from being damaged due to shorts to
the USB bus voltage rail.
The MAX4906/MAX4906F/MAX4907/MAX4907F analog
switches are fully compliant with the USB 2.0 specification. The low on-resistance and low on-capacitance of
these switches make them ideal for high-performance
switching applications. The MAX4906/MAX4906F are
______________________________________________________________________________________
11
MAX4906/MAX4606F/MAX4907/MAX4907F
Functional Diagram/Truth Table
MAX4906/MAX4606F/MAX4907/MAX4907F
High-/Full-Speed USB 2.0 Switches
ASIC I
SHARED
DATA PINS
D+
USB
TRANSCEIVER
D-
MAX4907/
MAX4907F
VBUS
MAX4906/
MAX4906F
NC1
NO1
DATA
COM1
D+
NO1
COM1
USB
TRANSCEIVER
SPI/GPIO
DEVICE
CLOCK
NO2
COM2
NC2
D-
COM2
ASIC II
NO2
EN
TRI-STATE
ENABLE
D+
USB
TRANSCEIVER
Figure 9. MAX4907/MAX4907F USB/SPI/GPIO Switch
DGND
USB
CONNECTOR
Figure 7. MAX4906/MAX4906F USB Data Routing
MAX4906/
MAX4906F
Power-Supply Sequencing
NC1
USB0+
COM1
NO1
USB
TRANSCEIVER
NC2
USB1+
USB0-
COM2
NO2
USB1-
Figure 8. MAX4906/MAX4906F Switching Between Multiple
USB Hosts
ideal for routing USB data lines (see Figure 7) and for
applications that require switching between multiple
USB hosts (see Figure 8). The MAX4907/MAX4907F
can be used in applications that require different data
types to share the same pins (see Figure 9); however,
the shared device must be capable of going into the tristate mode. The MAX4906F/MAX4907F also feature
+5.5V fault protection to guard systems against shorts
to the USB bus voltage. The fault-protected versions
are recommended for all USB applications.
12
Ethernet Switching
The wide bandwidth of the MAX4906/MAX4906F/
MAX4907/MAX4907F meets the needs of 10/100 Ethernet
switching. These devices switch the signals from two
interface transformers and connect the signals to a single
10/100 Base-T Ethernet PHY, simplifying docking station
design and reducing manufacturing costs.
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 CMOS devices. Always apply V+ before applying
analog signals, especially if the analog signal is not
current limited.
Layout
High-speed switches require proper layout and design
procedures for optimum performance. Keep designcontrolled-impedance PC board traces as short as possible. Ensure that bypass capacitors are as close to the
device as possible. Use large ground planes where
possible.
______________________________________________________________________________________
High-/Full-Speed USB 2.0 Switches
Selector Guide
PART
CONFIGURATION
TOP VIEW
SHDN
1
GND
2
COM1
3
COM2
4
8
MAX4907
MAX4907F
IN
7
V+
6
NO1
5
NO2
FAULT
PROTECTION
TOP
MARK
MAX4906ELB
Dual SPDT
NO
AAB
MAX4906FELB
Dual SPDT
YES
AAA
MAX4907ELA
Dual SPST
NO
AAE
MAX4907FELA
Dual SPST
YES
AAD
μDFN
Chip Information
PROCESS: BiCMOS
Revision History
Pages changed at Rev 2: 1, 2, 3, 7, 11, 14
______________________________________________________________________________________
13
MAX4906/MAX4606F/MAX4907/MAX4907F
Pin Configurations (continued)
Package Information
(The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information
go to www.maxim-ic.com/packages.)
A
D
XXXX
XXXX
XXXX
b
e
6, 8, 10L UDFN.EPS
MAX4906/MAX4606F/MAX4907/MAX4907F
High-/Full-Speed USB 2.0 Switches
N
SOLDER
MASK
COVERAGE
E
PIN 1
0.10x45∞
L
L1
1
SAMPLE
MARKING
PIN 1
INDEX AREA
A
A
(N/2 -1) x e)
7
CL
CL
b
L
A
A2
L
e
EVEN TERMINAL
A1
e
ODD TERMINAL
PACKAGE OUTLINE,
6, 8, 10L uDFN, 2x2x0.80 mm
21-0164
-DRAWING NOT TO SCALE-
A
1
2
COMMON DIMENSIONS
SYMBOL
MIN.
NOM.
A
0.70
0.75
A1
0.15
0.20
0.25
A2
0.020
0.025
0.035
D
1.95
2.00
E
1.95
2.00
L
0.30
0.40
L1
MAX.
0.80
-
2.05
2.05
0.50
0.10 REF.
PACKAGE VARIATIONS
PKG. CODE
N
e
b
(N/2 -1) x e
L622-1
6
0.65 BSC
0.30±0.05
1.30 REF.
L822-1
8
0.50 BSC
0.25±0.05
1.50 REF.
L1022-1
10
0.40 BSC
0.20±0.03
1.60 REF.
PACKAGE OUTLINE,
6, 8, 10L uDFN, 2x2x0.80 mm
-DRAWING NOT TO SCALE-
21-0164
A
2
2
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.
14 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600
© 2007 Maxim Integrated Products
is a registered trademark of Maxim Integrated Products. Inc.