19-0613; Rev 2; 3/09
High-/Full-Speed USB 2.0 Switches
with High ESD
General Description
The MAX4906EF are electrostatic discharge (ESD)-pro-
tected analog switches that combine low on-capacitance
(C
ON
) and low on-resistance (R
ON
) necessary for high-
performance switching applications. The COM_ inputs
are protected against ±15kV ESD without latchup or dam-
age. 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 protect-
ed 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
V
IH
, 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 quies-
cent 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.
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
Ordering Information
PART
MAX4906EFELB+T
TEMP RANGE
-40°C to +85°C
PIN-
PACKAGE
10 μDFN
TOP
MARK
AAJ
Applications
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
+Denotes
a lead(Pb)-free/RoHS-compliant package.
T = Tape and reel.
Typical Operating Characteristics
EYE DIAGRAM
V+ = 3.3V
I
BIAS
= 9mA
UI = 2.08ns
V
NO1OUT
Pin Configuration
TOP VIEW
+
IN
1
2
3
4
5
10
9
V+
NC1
NC2
NO1
NO2
QP
USB 2.0
HIGH SPEED
TRANSMIT
TEMPLATE
100mV/div
GND
COM1
COM2
MAX4906EF
8
7
6
V
NO2OUT
200ps/div
μDFN
________________________________________________________________
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.
High-/Full-Speed USB 2.0 Switches
with High ESD
MAX4906EF
ABSOLUTE MAXIMUM RATINGS
(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
Note 1:
Signals on IN,
QP
exceeding 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+ = +2.7V to +3.6V, T
A
= T
MIN
to T
MAX
, charge-pump enabled, unless otherwise noted. Typical values are at V+= 3.3V, T
A
=
+25°C.) (Note 2)
PARAMETER
ANALOG SWITCH
Analog Signal Range
Fault-Protection Trip Threshold
(Note 4)
V
COM
_,V
NO_
,
QP
= GND or V+ (Note 3)
V
NC_
V
FP
V+ = 2.7V,
I
COM_
= -10mA,
V
COM_
= 0V, 1.5V,
QP
= GND
V+ = 2.7V,
I
COM_
= -10mA,
V
COM_
= 2.7V,
QP
= GND
V+ = 3.0V,
I
COM_
= -10mA,
V
COM_
= 0V, 1.5V,
QP
= V+
V+=2.7V,
I
COM_
= -10mA,
V
COM_
= 0V, 1.5V,
QP
= V+
V+ = 2.7V,
I
COM_
= -10mA,
V
COM_
= 0V, 1.5V, 2.7V
(Note 5)
T
A
= +25°C
T
A
= T
MIN
to T
MAX
T
A
= +25°C
T
A
= T
MIN
to T
MAX
T
A
= +25°C
T
A
= T
MIN
to T
MAX
T
A
= +25°C
T
A
= T
MIN
to T
MAX
T
A
= +25°C
T
A
= T
MIN
to T
MAX
0.5
8
5
4
0
3.62
3.9
3.8
3.6
4.20
5
Ω
6
7
Ω
8
12
13
Ω
15
17
0.8
Ω
1.0
V
V
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
On-Resistance, Charge-Pump
Enabled
R
ON
On-Resistance, Charge-Pump
Disabled
R
ON
On-Resistance Match Between
Channels
ΔR
ON
On-Resistance Flatness
R
FLAT(ON)
V+ = 2.7V,
I
COM_
= -10mA, V
COM_
= 0V, 1.5V
(Note 6)
0.5
Ω
2
_______________________________________________________________________________________
High-/Full-Speed USB 2.0 Switches
with High ESD
ELECTRICAL CHARACTERISTICS (continued)
(V+ = +2.7V to +3.6V, T
A
= T
MIN
to T
MAX
, charge-pump enabled, unless otherwise noted. Typical values are at V+= 3.3V, T
A
=
+25°C.) (Note 2)
PARAMETER
Off-Leakage Current
On-Leakage Current
SWITCH AC PERFORMANCE
On-Channel -3dB Bandwidth
BW
R
L
= R
S
= 50Ω, signal = 0dBm, Figure 1
f = 10MHz; V
NO_
, V
NC_
= 1V
P-P
;
R
L
= R
S
= 50Ω, Figure 1
f = 250MHz; V
NO_
, V
NC_
= 1V
P-P
;
R
L
= R
S
= 50Ω, Figure 1
f = 10MHz; V
NO_
, V
NC_
= 1V
P-P
;
R
L
= R
S
= 50Ω, Figure 1
f = 250MHz; V
NO_
, V
NC_
= 1V
P-P
;
R
L
= R
S
= 50Ω, Figure 1
Any input or output switch terminal = 50Ω
500
-60
dB
-32
-59
dB
-31
90
µV
MHz
SYMBOL
I
NC_,
I
NO_
(OFF)
MAX4906EF
CONDITIONS
V+ = 3.6V, V
COM_
= 0.3V, 3.3V;
V
NO_
or V
NC_
= 3.3V, 0.3V
V+ = 3.6V, V
COM
= 0.3V, 3.3V;
V
NO_
or V
NC_
= 0.3V, 3.3V, or unconnected
MIN
-1
-1
TYP
MAX
+1
+1
UNITS
µA
µA
I
NC_,
I
NO_
(ON)
Off-Isolation
V
ISO
Crosstalk (Note 7)
V
CT
Charge-Pump Noise (Note 8)
SWITCH DYNAMICS
NO_, NC_, COM_
Off-Capacitance (Note 9)
NO_, NC_, COM_
On-Capacitance (Note 9)
Switch On-Capacitance Matching
(Note 9)
Turn-On Time
Turn-Off Time
Propagation Delay
Fault-Protection Response Time
Fault-Protection Recovery Time
Output Skew Between Switches
(Note 9)
Output Skew Same Switch
(Note 9)
V
QP
C
(OFF)
C
(ON)
C
ONM
t
ON
t
OFF
t
PLH_
,t
PHL
t
FP
t
FPR
t
SK(o)
t
SK(p)
f = 1MHz, Figure 2
f = 1MHz, Figure 2
f = 1MHz
V
NO
_, V
NC
_ = 1.5V; R
L
= 300Ω, C
L
= 35pF,
V
IH
= V+, V
IL
= 0V,
QP
= GND, Figure 3
V
NO
_, V
NC
_ = 1.5V; R
L
= 300Ω, C
L
= 35pF,
V
IH
= V+, V
IL
= GND,
QP
= GND, Figure 3
R
L
= R
S
= 50Ω, Figure 4
V
COM_
= 0 to 5V step,
R
L
= R
S
= 50Ω, C
L
= 10pF, Figure 5
V
COM_
= 5V to 3V step,
R
L
= R
S
= 50Ω, C
L
= 10pF, Figure 5
Skew between switch 1 and switch 2,
R
L
= R
S
= 50Ω, Figure 4
Skew between opposite transitions in same
switch, R
L
= R
S
= 50Ω, Figure 4
9
10
0.4
1.4
35
0.2
1
1
20
5
10
12
pF
pF
pF
ns
ns
ns
µs
µs
100
100
ps
ps
_______________________________________________________________________________________
3
High-/Full-Speed USB 2.0 Switches
with High ESD
MAX4906EF
ELECTRICAL CHARACTERISTICS (continued)
(V+ = +2.7V to +3.6V, T
A
= T
MIN
to T
MAX
, charge-pump enabled, unless otherwise noted. Typical values are at V+= 3.3V, T
A
=
+25°C.) (Note 2)
PARAMETER
Total Harmonic Distortion Plus
Noise
Charge Injection
SWITCH LOGIC
Logic-Input Voltage Low
Logic-Input Voltage High
Input-Logic Hysteresis
Input Leakage Current
Operating Supply-Voltage Range
Quiescent Supply Current
Quiescent Supply Current With
Charge-Pump Disabled
ESD PROTECTION
COM_
Human Body Model
±15
kV
V
IL
V
IH
V
HYST
I
IN
V+
I+
I+
V+ = 3.6V, V
IN
= 0 or V+,
QP
= GND
V+ = 3.6V, V
IN
= 0 or V+,
QP
= V+
V+ = 3.6V, V
IN
= 0 or V+
-1
2.7
160
1.4
100
+1
3.6
1000
3
0.4
V
V
mV
µA
V
µA
µA
SYMBOL
THD+N
Q
CONDITIONS
V
COM_
= 2V
P-P
, R
L
= 600Ω, f = 20Hz to
20kHz
V
GEN
= 1.5V, R
GEN
= 0Ω, C
L
= 100pF,
Figure 6
MIN
TYP
0.01
20
MAX
UNITS
%
pC
Note 2:
All units are 100% production tested at T
A
= +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:
Fault-protection trip threshold limits are not production tested; guaranteed by design.
Note 5:
ΔR
ON(MAX)
= | R
ON(CH1) –
R
ON(CH2)
|
Note 6:
Flatness is defined as the difference between the maximum and minimum value of on-resistance, as measured over
specified analog signal ranges.
Note 7:
Between any two switches.
Note 8:
Noise specification is measured peak to peak.
Note 9:
Switch off-capacitance, switch on-capacitance, output skew between switches, and output skew same-switch limits are not
production tested; design guaranteed by correlation.
Typical Operating Characteristics
(V+ = 3.3V, T
A
= +25°C, unless otherwise noted.)
ON-RESISTANCE vs. V
COM
MAX4906EF toc01
ON-RESISTANCE vs. V
COM
MAX4906EF toc02
LEAKAGE CURRENT vs. TEMPERATURE
10
9
COM ON-LEAKAGE CURRENT (nA)
8
7
6
5
4
3
2
1
COM OFF-LEAKAGE
-40
-15
10
35
60
85
COM ON-LEAKAGE
V+ = 3.6V
MAX4906EF toc03
6
5
V+ = 2.7V
4
R
ON
(Ω)
6
5
4
R
ON
(Ω)
T
A
= +85°C
10
9
8
7
6
5
4
3
2
1
0
COM OFF-LEAKAGE CURRENT (pA)
V+ = 3.6V
3
2
1
0
0
0.9
1.8
V
COM
(V)
V+ = 3.3V
3
T
A
= -40°C
2
1
0
T
A
= +25°C
0
0
1.1
V
COM
(V)
2.2
3.3
TEMPERATURE (°C)
2.7
3.6
4
_______________________________________________________________________________________
High-/Full-Speed USB 2.0 Switches
with High ESD
Typical Operating Characteristics (continued)
(V+ = 3.3V, T
A
= +25°C, unless otherwise noted.)
CHARGE INJECTION vs. V
COM
MAX4906EF toc04
MAX4906EF
QUIESCENT SUPPLY CURRENT
vs. TEMPERATURE
MAX4906EF toc05
QUIESCENT SUPPLY CURRENT
vs. LOGIC LEVEL
MAX4906EF toc06
25
C
L
= 100pF
20
CHARGE INJECTION (pC)
200
QUIESCENT SUPPLY CURRENT (μA)
180
160
140
120
100
80
60
40
20
V+ = 2.7V
V+ = 3.6V
220
QUISCENT SUPPLY CURRENT (μA)
200
15
180
10
160
5
0
0
1.1
V
COM
(V)
2.2
3.3
0
-40
-15
10
35
60
85
TEMPERATURE (°C)
140
0
1.1
2.2
3.3
LOGIC LEVEL (V)
LOGIC-INPUT LOW THRESHOLD
vs. SUPPLY VOLTAGE
MAX4906EF toc07
TURN-ON/-OFF TIME
vs. SUPPLY VOLTAGE
5
MAX4906EF toc08
1.0
LOGIC-INPUT LOW THRESHOLD (V)
40
0.8
V
IL
4
t
OFF
38
0.4
2
34
0.2
1
t
ON
32
0
2.7
3.0
3.3
3.6
SUPPLY VOLTAGE (V)
0
2.7
3.0
3.3
SUPPLY VOLTAGE (V)
3.6
30
TURN-ON/-OFF TIME
vs. TEMPERATURE
10
MAX4906EF toc09
RISE-/FALL-TIME PROPAGATION DELAY
vs. SUPPLY VOLTAGE
OUTPUT RISE-/FALL-TIME DELAY (ps)
MAX4906EF toc10
40
250
8
t
OFF
38
240
t
OFF
(ns)
t
ON
(μs)
6
36
230
t
PHL
220
4
34
2
t
ON
0
-40
-15
10
35
TEMPERATURE (°C)
60
85
32
210
t
PLH
30
200
2.7
3.0
3.3
SUPPLY VOLTAGE (V)
3.6
_______________________________________________________________________________________
t
OFF
(ns)
t
ON
(μs)
0.6
3
36
5
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