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General Description
The MAX4906EF are electrostatic discharge (ESD)-protected analog switches that combine low on-capacitance
(CON) and low on-resistance (RON) necessary for highperformance switching applications. The COM_ inputs
are protected against ±15kV ESD without latchup or damage. The device is designed for USB 2.0 high-speed
applications at 480Mbps. The switches also handle all the
requirements for USB low- and full-speed signaling.
The MAX4906EF features two single-pole/double-throw
(SPDT) switches. The device is fully specified to operate
from a single +2.7V to +3.6V power supply and is protected against a +5.5V short to all analog inputs (COM_, NC_,
NO_). This feature makes the MAX4906EF fully compliant
with the USB 2.0 specification of +5.5V fault protection.
The device features a low threshold voltage and a +1.4V
VIH, permitting them to be used with low-voltage logic.
The device features a QP input that when driven high,
turns the charge pump off and sets the device in standby
mode. When the device is in standby mode, the quiescent supply current is reduced to 3µA (max) and the
switches remain operable.
The MAX4906EF is available in a space-saving, 2mm x
2mm µDFN package and operates over a -40°C to +85°C
temperature range.
Applications
Features
♦ ±15kV (Human Body Model) ESD Protection,
on COM_
♦ Fully Specified for a Single +2.7V to +3.6V
Power-Supply Voltage
♦ Low 4Ω (typ), 7Ω (max) On-Resistance (R
ON
)
♦ -3dB Bandwidth: 500MHz (typ)
♦ Low Bit-to-Bit Skew ≤ 20ps
♦ Charge-Pump Noise = 90µV (typ)
♦ Charge-Pump Enable
♦ No Need for Logic-Level Shifters for 1.4V or
Above
♦ COM
_
Analog Inputs Fault-Protected Against
Shorts to USB Supply Rail Up to +5.5V
♦ Low Supply Current 3µA (max) in Standby
♦ Space-Saving 10-Pin, 2mm x 2mm µDFN Package
MAX4906EF
High-/Full-Speed USB 2.0 Switches
with High ESD
________________________________________________________________ Maxim Integrated Products 1
Ordering Information
19-0613; Rev 1; 11/07
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.
Note: The device operates over the -40°C to +85°C operating
temperature range.
+Denotes a lead-free package.
PART
PIN-PACKAGE
TOP
PKG
CODE
MAX4906EFELB+T
10 µDFN-10 AAJ
L1022-1
USB Switching
Cell Phones
PDAs
Digital Still Cameras
GPS
Notebook Computers
Relay Replacements
Ethernet Switching
Video Switching
Bus Switches
T3/E3 Switches for
Redundancy Protection
1
2
3
4
5
10
9
8
7
6
V+
NC1
NC2
NO1COM1
GND
QP
IN
MAX4906EF
μDFN
NO2COM2
TOP VIEW
+
Pin Configuration
EYE DIAGRAM
200ps/div
V+ = 3.3V
I
BIAS
= 9mA
UI = 2.08ns
V
NO1OUT
100mV/div
V
NO2OUT
USB 2.0
HIGH SPEED
TRANSMIT
TEMPLATE
Typical Operating Characteristics
MARK
High-/Full-Speed USB 2.0 Switches
with High ESD
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(V+ = +2.7V to +3.6V, TA= T
MIN
to T
MAX
, charge-pump enabled, unless otherwise noted. Typical values are at V+= 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: Signals on IN, QP exceeding GND are clamped by internal diodes. Limit forward-diode current to maximum current rating.
(All voltages referenced to GND.)
V+ .............................................................................-0.3V to +4V
IN, QP (Note 1).........................................................-0.3V to +4V
COM_, NO_, NC_ ..................................................-0.3V 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 (T
A
= +70°C)
10-Pin µDFN (derate 5.0mW/°C above +70°C) ...........403mW
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
MAX4906EF
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
ANALOG SWITCH
Analog Signal Range
V
NC _
QP = 0 or V+ (Note 3) 0 3.6 V
Fault-Protection Trip Threshold
(Note 9)
V
FP
3.9
V
TA = +25°C 3.8 5
V+ = 2.7V,
I
COM_
= -10mA,
V
COM_
= 0V, 1.5V,
QP = 0V
6
Ω
TA = +25°C 4 7
On-Resistance, Charge-Pump
Enabled
R
ON
V+ = 2.7V,
I
COM_
= -10mA,
V
COM_
= 2.7V,
QP = 0V
8
Ω
TA = +25°C 5 12
V+ = 3.0V,
I
COM_
= -10mA,
V
COM_
= 0V, 1.5V,
QP = V+
13
TA = +25°C 8 15
On-Resistance, Charge-Pump
Disabled
R
ON
V+=2.7V,
I
COM_
= -10mA,
V
COM_
= 0V, 1.5V,
QP = V+
17
Ω
TA = +25°C 0.5 0.8
On-Resistance Match Between
Channels
ΔR
ON
V+ = 2.7V,
I
COM_
= -10mA,
V
COM_
= 0V, 1.5V, 2.7V
(Note 4)
1.0
Ω
On-Resistance Flatness
)
V+ = 2.7V,
I
COM_
= -10mA, V
COM_
= 0V, 1.5V
(Note 5)
0.5 Ω
V
_,V
NO_
,
COM
3.62
TA = T
MIN
to T
MAX
TA = T
MIN
to T
MAX
R
FLAT(ON
TA = T
TA = T
TA = T
MIN
MIN
MIN
to T
to T
to T
MAX
MAX
MAX
4.20
MAX4906EF
High-/Full-Speed USB 2.0 Switches
with High ESD
_______________________________________________________________________________________ 3
ELECTRICAL CHARACTERISTICS (continued)
(V+ = +2.7V to +3.6V, TA= T
MIN
to T
MAX
, charge-pump enabled, unless otherwise noted. Typical values are at V+= 3.3V, TA=
+25°C.) (Note 2)
PARAMETER
CONDITIONS
UNITS
Off-Leakage Current
I
NC_, INO_
(OFF)
V+ = 3.6V, V
COM_
= 0.3V, 3.3V;
V
NO_
or V
NC_
= 3.3V, 0.3V
-1 +1 µA
On-Leakage Current
I
NC_, INO_
(ON)
V+ = 3.6V, V
COM
= 0.3V, 3.3V;
V
NO_
or V
NC_
= 0.3V, 3.3V, or floating
-1 +1 µA
SWITCH AC PERFORMANCE
On-Channel -3dB Bandwidth BW RL = RS = 50Ω, signal = 0dBm, Figure 1
MHz
f = 10MHz; V
NO_
, V
NC_
= 1V
P-P
;
R
L
= RS = 50Ω, Figure 1
-60
Off-Isolation V
ISO
f = 250MHz; V
NO_
, V
NC_
= 1V
P-P
;
R
L
= RS = 50Ω, Figure 1
-32
dB
f = 10MHz; V
NO_
, V
NC_
= 1V
P-P
;
R
L
= RS = 50Ω, Figure 1
-59
Crosstalk (Note 6) V
CT
f = 250MHz; V
NO_
, V
NC_
= 1V
P-P
;
R
L
= RS = 50Ω, Figure 1
-31
dB
Charge-Pump Noise (Note 7) V
QP
Any input or output switch terminal = 50Ω 90 µV
SWITCH DYNAMICS
NO_, NC_, COM_
Off-Capacitance (Note 8)
C
(OFF)
f = 1MHz, Figure 2 9 10 pF
NO_, NC_, COM_
On-Capacitance (Note 8)
C
(ON)
f = 1MHz, Figure 2 10 12 pF
Switch On-Capacitance Matching
(Note 8)
C
ONM
f = 1MHz 0.4 pF
Turn-On Time t
ON
V
N O
_, V
N C
_ = 1.5V ; RL = 300Ω , C L = 35p F,
V
IH
= V + , V IL = 0V , Q P = 0V ,
Fi g ur e 3
1.4 ns
Turn-Off Time t
OFF
VNO_, VNC_ = 1.5V; RL = 300Ω, CL = 35pF,
V
IH
= V+, VIL = 0V, Q P = 0V, Figure 3
35 ns
Propagation Delay
RL = RS = 50Ω, Figure 4 0.2 ns
Fault-Protection Response Time t
FP
V
COM_
= 0 to 5V step,
R
L
= RS = 50Ω, CL = 10pF, Figure 5
1µs
Fault-Protection Recovery Time t
FPR
V
COM_
= 5V to 3V step,
R
L
= RS = 50Ω, CL = 10pF, Figure 5
1µs
Output Skew Between Switches
(Note 8)
t
SK(o)
Skew between switch 1 and switch 2,
R
L
= RS = 50Ω, Figure 4
20 100 ps
Output Skew Same Switch
(Note 8)
t
SK(p)
Skew between opposite transitions in same
switch, R
L
= RS = 50Ω, Figure 4
5 100 ps
SYMBOL
t
PLH_,tPHL
MIN TYP MAX
500
MAX4906EF
High-/Full-Speed USB 2.0 Switches
with High ESD
4 _______________________________________________________________________________________
ELECTRICAL CHARACTERISTICS (continued)
(V+ = +2.7V to +3.6V, TA= T
MIN
to T
MAX
, charge-pump enabled, unless otherwise noted. Typical values are at V+= 3.3V, TA=
+25°C.) (Note 2)
PARAMETER
CONDITIONS
UNITS
Total Harmonic Distortion Plus
Noise
V
COM_
= 2V
P-P
, RL = 600Ω, f = 20Hz to
20kHz
%
Charge Injection Q
V
GEN
= 1.5V, R
GEN
= 0Ω, CL = 100pF,
Figure 6
20 pC
SWITCH LOGIC
Logic-Input Voltage Low V
IL
0.4 V
Logic-Input Voltage High V
IH
1.4 V
Input-Logic Hysteresis V
HYST
mV
Input Leakage Current I
IN
V+ = 3.6V, VIN = 0 or V+ -1 +1 µA
Operating Supply-Voltage Range
V+ 2.7 3.6 V
Quiescent Supply Current I+ V+ = 3.6V, VIN = 0 or V+, QP = 0V
µA
Quiescent Supply Current With
Charge-Pump Disabled
I+ V+ = 3.6V, V
IN
= 0 or V+, QP = V+ 3 µA
ESD PROTECTION
COM_ Human Body Model
kV
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 (V
FP
); therefore, protecting downstream circuits in case of a fault condition.
Note 4: ΔR
ON(MAX)
= | R
ON(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: Noise specification is measured peak to peak.
Note 8: Switch off-capacitance, switch on-capacitance, output skew between switches, and output skew same-switch limits are not
production tested; design guaranteed by correlation.
Note 9: Fault-protection trip threshold, limits are not production tested; guaranteed by design.
Typical Operating Characteristics
(V+ = 3.3V, TA = +25°C, unless otherwise noted.)
0
3
2
1
4
5
6
7
8
9
10
0
3
2
1
4
5
6
7
8
9
10
-40 10-15 35 60 85
LEAKAGE CURRENT vs. TEMPERATURE
MAX4906EF toc03
TEMPERATURE (°C)
COM ON-LEAKAGE CURRENT (nA)
COM OFF-LEAKAGE CURRENT (pA)
V+ = 3.6V
COM ON-LEAKAGE
COM OFF-LEAKAGE
0
2
1
4
3
5
6
01.80.9 2.7 3.6
ON-RESISTANCE vs. V
COM
MAX4906EF toc01
V
COM
(V)
R
ON
(Ω)
V+ = 2.7V
V+ = 3.6V
V+ = 3.3V
0
2
1
4
3
5
6
0 1.1 2.2 3.3
ON-RESISTANCE vs. V
COM
MAX4906EF toc02
V
COM
(V)
R
ON
(Ω)
TA = +85°C
TA = +25°C
TA = -40°C
SYMBOL
MIN TYP MAX
THD+N
0.01
100
160 1000
±15
MAX4906EF
High-/Full-Speed USB 2.0 Switches
with High ESD
_______________________________________________________________________________________ 5
140
160
180
200
220
0 1.1 2.2 3.3
QUIESCENT SUPPLY CURRENT
vs. LOGIC LEVEL
MAX4906EF toc06
LOGIC LEVEL (V)
QUISCENT SUPPLY CURRENT (μA)
0
0.2
0.6
0.4
0.8
1.0
LOGIC-INPUT LOW THRESHOLD
vs. SUPPLY VOLTAGE
MAX4906EF toc07
SUPPLY VOLTAGE (V)
LOGIC-INPUT LOW THRESHOLD (V)
2.7 3.0 3.3 3.6
V
IL
TURN-ON/-OFF TIME
vs. SUPPLY VOLTAGE
SUPPLY VOLTAGE (V)
t
ON
(μs)
MAX4906EF toc08
t
OFF
(ns)
30
32
34
36
38
40
2.7 3.0 3.3 3.6
0
1
2
3
4
5
t
OFF
t
ON
TURN-ON/-OFF TIME
vs. TEMPERATURE
TEMPERATURE (°C)
t
ON
(μs)
MAX4906EF toc09
t
OFF
(ns)
30
32
34
36
38
40
-40 -15 10 35 60 85
0
2
4
6
8
10
t
ON
t
OFF
RISE-/FALL-TIME PROPAGATION DELAY
vs. SUPPLY VOLTAGE
SUPPLY VOLTAGE (V)
OUTPUT RISE-/FALL-TIME DELAY (ps)
MAX4906EF toc10
2.7 3.0 3.3 3.6
200
210
220
230
240
250
t
PLH
t
PHL
Typical Operating Characteristics (continued)
(V+ = 3.3V, TA = +25°C, unless otherwise noted.)
CHARGE INJECTION vs. V
COM
V
COM
(V)
CHARGE INJECTION (pC)
MAX4906EF toc04
0 1.1 2.2 3.3
0
5
10
15
20
25
CL = 100pF
0
60
40
20
80
100
120
140
160
180
200
-40 10-15 35 60 85
QUIESCENT SUPPLY CURRENT
vs. TEMPERATURE
MAX4906EF toc05
TEMPERATURE (°C)
QUIESCENT SUPPLY CURRENT (μA)
V+ = 3.6V
V+ = 2.7V
MAX4906EF
High-/Full-Speed USB 2.0 Switches
with High ESD
6 _______________________________________________________________________________________
FREQUENCY RESPONSE
FREQUENCY (MHz)
OFF-ISOLATION AND CROSSTALK (dB)
MAX4906EF toc14
-110
-100
-90
-80
-70
-60
-50
-40
-30
-20
-10
0
1 10 100 1000
OFF-ISOLATION
CROSSTALK
OUTPUT SKEW BETWEEN SWITCHES
vs. SUPPLY VOLTAGE
SUPPLY VOLTAGE (V)
OUTPUT SKEW (ps)
MAX4906EF toc13
2.7 3.0 3.3 3.6
0
10
20
30
TOTAL HARMONIC DISTORTION
PLUS NOISE vs. FREQUENCY
FREQUENCY (Hz)
THD+N (%)
MAX4906EF toc15
10 100 1k 10k 100k
0.001
0.01
0.1
1
RL = 600Ω
Typical Operating Characteristics (continued)
(V+ = 3.3V, TA = +25°C, unless otherwise noted.)
RISE-/FALL-TIME PROPAGATION DELAY
vs. TEMPERATURE
TEMPERATURE (°C)
OUTPUT RISE-/FALL-TIME DELAY (ps)
MAX4906EF toc11
-40 -15 10 35 60 85
200
210
220
230
240
250
t
PLH
t
PHL
SAME SWITCH OUTPUT SKEW
vs. SUPPLY VOLTAGE
SUPPLY VOLTAGE (V)
OUTPUT SKEW (ps)
MAX4906EF toc12
2.7 3.0 3.3 3.6
0
1
2
3
4
5
6
7
8
9
10
MAX4906EF
High-/Full-Speed USB 2.0 Switches
with High ESD
Pin Description
PIN NAME FUNCTION
1 IN Digital Control Input. IN controls switch 1 and switch 2.
2 Q P
Charge-Pump Enable Input. Drive QP high to turn charge pump off. For normal operation, drive QP low.
3 GND Ground
4 COM1 Analog Switch 1—Common Terminal
5 COM2 Analog Switch 2—Common Terminal
6 NO2 Analog Switch 2—Normally Open Terminal
7 NO1 Analog Switch 1—Normally Open Terminal
8 NC2 Analog Switch 2—Normally Closed Terminal
9 NC1 Analog Switch 1—Normally Closed Terminal
10 V+
Positive-Supply Voltage Input. Connect V+ to a +2.7V to +3.6V supply voltage. Bypass V+ to GND with a
0.1µF capacitor.
Test Circuits/Timing Diagrams
_______________________________________________________________________________________ 7
Figure 1. Off-Isolation and Crosstalk
0V OR V+
50Ω
IN_
NC1
10nF
+3.3V
V+
MAX4906EF
GND
COM1
NO1*
V
NETWORK
ANALYZER
V
IN
V
OUT
50Ω
MEAS REF
50Ω 50Ω
50Ω
OFF-ISOLATION = 20log
CROSSTALK = 20log
OUT
V
IN
V
OUT
V
IN
MEASUREMENTS ARE STANDARDIZED AGAINST SHORTS AT IC TERMINALS.
OFF-ISOLATION IS MEASURED BETWEEN COM_ AND "OFF" 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.
MAX4906EF
High-/Full-Speed USB 2.0 Switches
with High ESD
8 _______________________________________________________________________________________
Test Circuits/Timing Diagrams (continued)
CAPACITANCE
METER
NC_ or
NO_
COM_
GND
IN
V
IL
OR V
IH
10nF
V+
f = 1MHz
V+
MAX4906EF
Figure 2. Channel Off-/On-Capacitance
tr < 5ns
tf < 5ns
50%
V
IL
LOGIC
INPUT
R
L
COM_
GND
IN
C
L
INCLUDES FIXTURE AND STRAY CAPACITANCE.
V
OUT
= V
N_ (
R
L
)
RL + R
ON
V
N_
V
IH
t
OFF
0V
NO_
OR NC_
0.9 x V
0UT
0.1 x V
OUT
t
ON
V
OUT
SWITCH
OUTPUT
LOGIC
INPUT
IN DEPENDS ON SWITCH CONFIGURATION;
INPUT POLARITY DETERMINED BY SENSE OF SWITCH.
V+
C
L
V+
V
OUT
MAX4906EF
Figure 3. Switching Time
MAX4906EF
High-/Full-Speed USB 2.0 Switches
with High ESD
_______________________________________________________________________________________ 9
IN+
IN-
IN
OUT+
OUT-
V
IN+
V
IN-
V
OUT+
V
OUT-
NC1 OR
NO1
NC2 OR
NO2
COM1
COM2
0V
V+
0V
V+
0V
V+
0V
V+
t
PLHX
t
PHLX
t
INRISE
t
OUTRISE
t
OUTFALL
RISE-TIME PROPAGATION DELAY = t
PLHX
OR t
PLHY
FALL-TIME PROPAGATION DELAY = t
PHLX
OR t
PHLY
t
SK(O)
= |t
PLHX
- t
PLHY
| OR |t
PHLX
- t
PHLY
|
t
SK(P)
= |t
PLHX
- t
PHLX
| OR |t
PLHY
- t
PHLY
|
50%
50%
50%
50%
90%
10% 10%
90%
10% 10%
MAX4906EF
R
L
R
L
50%
50%
50%
50%
t
INFALL
90%
90%
t
PHLY
t
PLHY
R
S
R
S
VIL TO V
IH
Figure 4. Output Signal Skew, Rise/Fall Time, Propagation Delay
_______________________________________________________________________________________ 9
Test Circuits/Timing Diagrams (continued)
MAX4906EF
High-/Full-Speed USB 2.0 Switches
with High ESD
10 ______________________________________________________________________________________
2.5V
V
PF
t
PF
t
FPR
5V
3V
0V
3V
1.5V
2.5V
0V
VCOM_
VNC_
VNO_
Figure 5. MAX4906EF Fault-Protection Response/Recovery Time
Test Circuits/Timing Diagrams (continued)
V
GEN
GND
COM_
C
L
V
OUT
V+
V
OUT
IN
OFF
ON
OFF
ΔV
OUT
Q = (ΔV
OUT
)(CL)
NC_
LOGIC-INPUT WAVEFORMS INVERTED FOR SWITCHES
THAT HAVE THE OPPOSITE LOGIC SENSE.
OFF
ON
OFF
IN
V
IL
TO V
IH
V+
R
GEN
IN
MAX4906EF
OR NO_
Figure 6. Charge Injection
Detailed Description
The MAX4906EF are ESD-protected analog switches
where the COM_ inputs are further protected up to
±15kV ESD without latchup or damage. The device is
targeted for USB 2.0 high-speed (480Mbps) switching
applications. The device still meets USB low- and fullspeed requirements and is suitable for 10/100 Ethernet
switching. The MAX4906EF features two SPDT switches.
The MAX4906EF is fully specified to operate from a single
+2.7V to +3.6V supply and is +5.5V fault protected.
When operating from a +2.7V to +3.6V supply, the low
threshold of the device permits them to be used with
logic levels as low as 1.4V. The MAX4906EF is based on
a charge-pump-assisted n-channel architecture and thus
operate at 170µA (max) quiescent current. The device
features a standby mode to reduce the quiescent current
to less than 3µA (max).
Digital Control Input
The MAX4906EF provides a single-digit control logic
input, IN. IN controls the position of the switches as
shown in the Functional Diagram/Truth Table. Driving IN
MAX4906EF
High-/Full-Speed USB 2.0 Switches
with High ESD
______________________________________________________________________________________ 11
rail-to-rail minimizes power consumption. With a +2.7V
to +3.6V supply voltage range, the device is +1.4V
logic compatible.
Analog Signal Levels
The on-resistance of the MAX4906EF 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.
Overvoltage Fault Protection
The MAX4906EF features +5.5V fault protection to
all analog inputs. Fault protection prevents these
switches from being damaged due to shorts to the USB
bus voltage rail.
Charge-Pump Enable
The MAX4906EF features a charge-pump enable mode
that improves the performance and the dynamic range
of the device. The device features a QP input that when
driven high, turns the charge pump off and sets the
device in standby mode. When the device is in standby
mode, the quiescent supply current is reduced to 3µA
(max) and the switches remain operable. When QP is
driven low, the charge pump is enabled and the switches enter an improved high-performance mode.
Applications Information
USB Switching
The MAX4906EF analog switch is fully compliant with
the USB 2.0 specification. The low on-resistance and
low on-capacitance of these switches make the device
ideal for high-performance switching applications. The
MAX4906EF is ideal for routing USB data lines (see
Figure 7) and for applications that require switching
between multiple USB hosts (see Figure 8). The
MAX4906EF also features +5.5V fault protection to
guard systems against shorts to the USB bus voltage
that is recommended for all USB applications.
Ethernet Switching
The wide bandwidth of the MAX4906EF meets the needs
of 10/100 Ethernet switching. The device 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.
±15kV ESD Protection
As with all Maxim devices, ESD-protection structures are
incorporated on all pins to protect against electrostatic
discharges encountered during handling and assembly.
COM_ are further protected against static electricity.
Maxim’s engineers have developed state-of-the-art
structures to protect these pins against ESD up to
±15kV without damage. The ESD structures withstand
high ESD in normal operation, and when the device is
powered down. After an ESD event, the MAX4906EF
continues to function without latchup, whereas competing products can latch and must be powered down to
restore functionality.
ESD protection can be tested in various ways. The ESD
protection of COM_ are characterized for ±15kV
(Human Body Model) using the MIL-STD-883.
ESD Test Conditions
ESD performance depends on a variety of conditions.
Contact Maxim for a reliability report that documents
test setup, test methodology, and test results.
Human Body Model
Figure 9a shows the Human Body Model and Figure 9b
shows the current waveform it generates when discharged into a low impedance. This model consists of
Functional Diagram/Truth Table
IN
V+
NC1
NO1
NC2
NO2
COM1
COM2
GND
QP
MAX4906EF
QP IN
1
1
00OFF
MAX4906EF
OFF
NO1
NO2
0
ON
ON
ON
NC1
NC2
OFF
0
HIGH PERFORMANCE
HIGH PERFORMANCE
LOW PERFORMANCE
1ON1 OFF
LOW PERFORMANCE
MAX4906EF
High-/Full-Speed USB 2.0 Switches
with High ESD
12 ______________________________________________________________________________________
a 100pF capacitor charged to the ESD voltage of interest, which is then discharged into the test device
through a 1.5kΩ resistor.
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.
Chip Information
PROCESS: BiCMOS
IP 100%
90%
36.8%
t
RL
TIME
t
DL
CURRENT WAVEFORM
PEAK-TO-PEAK RINGING
(NOT DRAWN TO SCALE)
I
r
10%
0
0
AMPERES
Figure 9b. Human Body Current Waveform
CHARGE-CURRENT-
LIMIT RESISTOR
DISCHARGE
RESISTANCE
STORAGE
CAPACITOR
C
s
100pF
R
C
1MΩ
R
D
1500Ω
HIGH-
VOLTAGE
DC
SOURCE
DEVICE
UNDER
TEST
Figure 9a. Human Body ESD Test Model
V
BUS
ASIC I
ASIC II
USB
TRANSCEIVER
D+
D-
D+
NC1
NO1
NC2
NO2
D-
D+
D-
GND
USB
CONNECTOR
COM1
COM2
USB
TRANSCEIVER
MAX4906EF
Figure 7. USB Data Routing
Figure 8. Switching Between Multiple USB Hosts
MAX4906EF
USB
TRANSCEIVER
COM1
COM2
NC1
NO1
NC2
NO2
USB
USB
USB
USB
+
0
+
1
-
0
-
1
MAX4906EF
High-/Full-Speed USB 2.0 Switches
with High ESD
______________________________________________________________________________________ 13
6, 8, 10L UDFN.EPS
EVEN TERMINAL
L
C
ODD TERMINAL
L
C
L
e
L
A
e
E
D
PIN 1
INDEX AREA
b
e
A
b
N
SOLDER
MASK
COVERAGE
A A
1
PIN 1
0.10x45∞
L
L1
(N/2 -1) x e)
XXXX
XXXX
XXXX
SAMPLE
MARKING
A1
A2
7
A
1
2
21-0164
PACKAGE OUTLINE,
6, 8, 10L uDFN, 2x2x0.80 mm
-DRAWING NOT TO SCALE-
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
.)
MAX4906EF
High-/Full-Speed USB 2.0 Switches
with High ESD
14 ______________________________________________________________________________________
Package Information (continued)
(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
.)
COMMON DIMENSIONS
SYMBOL MIN. NOM.
A
0.70 0.75
A1
D 1.95 2.00
E
1.95 2.00
L
0.30 0.40
PKG. CODE N e b
PACKAGE VARIATIONS
L1
6L622-1 0.65 BSC 0.30±0.05
0.25±0.050.50 BSC8L822-1
0.20±0.030.40 BSC10L1022-1
2.05
0.80
MAX.
0.50
2.05
0.10 REF.
(N/2 -1) x e
1.60 REF.
1.50 REF.
1.30 REF.
A2
-
-DRAWING NOT TO SCALE-
A
2
2
21-0164
PACKAGE OUTLINE,
6, 8, 10L uDFN, 2x2x0.80 mm
0.15 0.20 0.25
0.020 0.025 0.035
MAX4906EF
High-/Full-Speed USB 2.0 Switches
with High ESD
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.
Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 ____________________ 15
© 2007 Maxim Integrated Products is a registered trademark of Maxim Integrated Products, Inc.
Revision History
REVISION
DATE
DESCRIPTION
PAGES
CHANGED
0 8/06 Initial release —
1 11/07 Changes to EC Table 2, 4
REVISION
NUMBER
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