MAX4927ETN+ ,1000 Base-T, ±15kV ESD Protection LAN SwitchApplicationsSTMUX1000LNotebooks and Docking Stations ♦ Space-Saving Lead-Free PackageServers and Ro ..
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MAX4927ETN+
1000 Base-T, ±15kV ESD Protection LAN Switch
General DescriptionThe MAX4927 meets the needs of high-speed differen-
tial switching, including that of Gigabit Ethernet
(10/100/1000) Base-T switching as well as LVDS and
LVPECL switching. The MAX4927 provides enhanced
ESD protection up to ±15kV and excellent high-fre-
quency response,making the device especially useful for
interfaces that must go to an outside connection.
The MAX4927 offers extremely low capacitance (CON),
as well as low on-resistance (RON), for low-insertion
loss and very wide bandwidth. In addition to the four
pairs of DPDT switches, the MAX4927 provides LED
switching for laptop computer/docking station use.
The MAX4927 is pin-to-pin equivalent to the PI3L500-A
and STMUX1000L. The MAX4927 can replace either
device in those applications, improving ESD protection
and eliminating external ESD components. The
MAX4927 is available in a space-saving 56-pin TQFN
package and operates over the extended -40°C to
+85°C temperature range.
ApplicationsNotebooks and Docking Stations
Servers and Routers with Ethernet Interfaces
Board-Level Redundancy Protection
SONET/SDH Signal Routing
T3/E3 Redundancy Protection
LVDS and LVPECL Switching
FeaturesESD Protection
±15kV–IEC 61000-4-2 Air-Gap Discharge
±8kV–IEC 61000-4-2 Contact Discharge
±15kV–Human Body ModelSingle +3.0V to +3.6V Power-Supply Voltage Low 4Ω(typ), 6.5Ω(max) On-Resistance (RON)Ultra-Low 8pF (typ) On-Capacitance (CON)-23dB Return Loss (100MHz)-3dB Bandwidth: 650MHzOptimized Pin Out for Easy Transformer and PHY
InterfaceBuilt-In LED Switches for Switching Indicators to
Docking StationLow 450µA (max) Quiescent CurrentBidirectional 8 to 16 Multiplexer/DemultiplexerStandard Pin Out, Matching the PI3L500-A and
STMUX1000LSpace-Saving Lead-Free Package
56-Pin, 5mm x 11mm, TQFN Package
MAX4927
1000 Base-T, ±15kV ESD Protection LAN Switch
Ordering Information19-0841; Rev 0; 6/07
PARTPIN-
PACKAGE
LED
SWITCHES
PKG
CODEMAX4927ETN+56 TQFN-EP*3T56511-1
+Denotes lead-free package.
Note:All devices are specified over the -40°C to +85°C operating
temperature range.
*EP = Exposed pad.
Typical Operating Circuit and Functional Diagrams appear
at end of data sheet.
Pin ConfigurationTOP VIEW
MAX4927
TQFN5mm x 11mm*CONNECT EXPOSED PADDLE TO GND OR
LEAVE EXPOSED PADDLE UNCONNECTED.
VDD*EP
GND
LED2
GND
2LED1
2LED2
VDD
GND
GND
0LED1
1LED1
GND
0LED2
1LED2
VDD
GND4746454443
3456789101112131415161718192041403938373635343332313029
GNDA4
VDD
GND
VDD
LED0LED1
SEL
GNDA3A2
GNDN.C.
VDDA0
GND
4B15B14B2VDDGND3B27B16B27B26B1GND5B22B23B12B1GND1B20B21B10B1
MAX4927
1000 Base-T, ±15kV ESD Protection LAN Switch
ABSOLUTE MAXIMUM RATINGSStresses 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.
VDD………………………………………………………-0.3V to +4V
All Other Pins…………………………………-0.3V to (VDD+ 0.3V)
Continuous Current (A_ to _B_)......................................±120mA
Continuous Current (LED_ to _LED_).…………………… ±40mA
Peak Current (A_ to _B_)
(pulsed at 1ms, 10% duty cycle) ……………………. ±240mA
Current into Any Other Pin................................................±20mA
Continuous Power Dissipation (TA= +70°C)
56-Pin TQFN (derate 40.9mW/°C above +70°C).......5278mW
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
ELECTRICAL CHARACTERISTICS(VDD= +3V to +3.6V, TA= TJ= TMINto TMAX, unless otherwise noted. Typical values are at VDD= 3.3V, TA= +25°C.) (Note 1)
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITS
ANALOG SWITCHTA = +25°C45.5
On-ResistanceRON
VDD = 3V,
IA_ = -40mA,
VA_ = 0, 1.5V, 3VTMIN to TMAX6.5
TA = +25°C0.51.5On-Resistance Match
Between Switch Pairs
(Note 2)
ΔRON
VDD = 3V,
IA_ = -40mA,
VA_ = 0, 1.5V, 3VTMIN to TMAX2
On-Resistance FlatnessRFLAT(ON)VDD = 3V, IA_ = -40mA, VA_ = 1.5V, 3V0.01Ω
On-Resistance LED SwitchesRONLEDV D D = 3V , I_LE D _ = - 40m A, V LE D _ = 0, 1.5V , 3V 40Ω
Off-Leakage CurrentILA_(OFF)VDD = 3.6V, VA_ = 0.3V, 3.3V;
V_B1 or V_B2 = 3.3V, 0.3V-1+1µA
On-Leakage CurrentILA_(ON)VDD = 3.6V, VA_ = 0.3V, 3.3V;
V_B1 or V_B2 = 0.3V, 3.3V, or floating-1+1µA
ESD PROTECTIONIEC 61000-4-2 Air-Gap Discharge±15
IEC 61000-4-2 Contact Discharge±8ESD Protection
Human Body Model (spec MIL-STD-883,
Method 3015)±15
SWITCH AC PERFORMANCEInsertion LossILOSRS = RL = 50Ω, unbalanced, f = 1MHz
(Note 2)0.6dB
Return LossRLOSf = 100MHz-23dB
VCT1f = 25MHz-50
Crosstalk
VCT2
Any switch to any
switch; RS = RL =
50Ω, unbalanced,
Figure 1f = 100MHz-26
MAX4927
1000 Base-T ±15kV ESD Protection LAN Switch
ELECTRICAL CHARACTERISTICS (continued)(VDD= +3V to +3.6V, TA= TJ= TMINto TMAX, unless otherwise noted. Typical values are at VDD= 3.3V, TA= +25°C.) (Note 1)
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITS
SWITCH AC CHARACTERISTICS-3dB BandwidthBWRS = RL = 50Ω, unbalanced650MHz
Off-CapacitanceCOFFf = 1MHz, _B_, A_3.5pF
On-CapacitanceCONf = 1MHz, _B_, A_6.5pF
Turn-On TimetONVA_ = 1V, RL = 100Ω, Figure 250ns
Turn-Off TimetOFFVA_ = 1V, RL = 100Ω, Figure 250ns
Propagation DelaytPLH, tPHLRS = RL = 50Ω, unbalanced, Figure 30.15ns
Output Skew Between PortstSK(o)Skew between any two ports, Figure 40.01ns
SWITCH LOGICInput-Voltage LowVILVDD = 3.0V0.8V
Input-Voltage HighVIHVDD = 3.6V2.0V
Input-Logic HysteresisVHYSTVDD = 3.3V100mV
Input Leakage CurrentISELVDD = 3.6V, VSEL = 0V or VDD-1+1µA
Operating-Supply Voltage RangeVDD3.03.6V
Quiescent Supply CurrentIDDVDD = 3.6V, VSEL = 0V or VDD280450µA
Note 1:Specifications at TA= -40°C are guaranteed by design.
Note 2:Guaranteed by design.
R15
49.9Ω
NETWORK
ANALYZER
NETWORK
ANALYZER
NETWORK
ANALYZER
NETWORK
ANALYZER
SINGLE-ENDED BANDWIDTH
50Ω TRACE
SINGLE-ENDED CROSSTALK
50Ω TRACE
SINGLE-ENDED OFF-ISOLATION
50Ω TRACE
50Ω TRACE
4B1
3B1
2B1
0B150Ω TRACENETWORK
ANALYZER
NETWORK
ANALYZER
50Ω TRACE
R14
49.9Ω
R13
49.9Ω
MAX4927
56 TQFN
SEL
VDD OR 0V
Figure 1. Single-Ended Bandwidth, Crosstalk, and Off-Isolation
MAX4927
1000 Base-T, ±15kV ESD Protection LAN SwitchVIH
VIL
50%
_B1
tOFF
tON
_B2
tON
50%
50%
50%50%
tOFF
50%
SEL
Figure 2. Turn-On and Turn-Off Times
2.0V
3.0V
1.0V
THE MAX4927 SWITCHES ARE FULLY BIDIRECTIONAL.
tPHL
2.0V
tPLH
_B_
PULSE SKEW = tSK(p) = |tPHL - tPLH|
Figure 3. Propagation Delay Times
2.0V
3.0V
1.0V
THE MAX4927 SWITCHES ARE FULLY BIDIRECTIONAL.
tPHLX
VOH
VOL
2.0V
tPLHX
_B_
OUTPUT SKEW = tSK(O) = |tPLHY - tPLHX| OR |tPHLY - tPHLX|
tPHLY
VOH
VOL
2.0V
tPLHY
_B_
Figure 4. Output Skew
MAX4927
1000 Base-T, ±15kV ESD Protection LAN Switch1.02.03.0
ON-RESISTANCE vs. VA_MAX4927 toc01
VA_ (V)TA = +85°C
TA = +25°CTA = -40°C
LED_ ON-RESISTANCE vs. VLED_
MAX4927 toc02
VLED_ (V)
ONLED
TA = +85°C
TA = +25°C
TA = -40°C
LEAKAGE CURRENT vs. TEMPERATURE
MAX4927 toc03
TEMPERATURE (°C)
LEAKAGE CURRENT (pA)
ILA_(OFF)
ILA_(ON)
QUIESCENT SUPPLY CURRENT
vs. TEMPERATURE
MAX4927 toc04
TEMPERATURE (°C)
QUIESCENT SUPPLY CURRENT (
VDD = 3.6V
SINGLE-ENDED INSERTION LOSS
vs. FREQUENCYMAX4927 toc05
FREQUENCY (MHz)
INSERTION LOSS (dB)
Typical Operating Characteristics
(VDD= 3.3V, TA= +25°C, unless otherwise noted.)
MAX4927
1000 Base-T, ±15kV ESD Protection LAN Switch
Pin Description
PINNAMEFUNCTION1, 6, 9, 13, 16,
21, 24, 28, 33,
39, 44, 49, 53,
GNDGroundA0Switch 0. Common terminal 0.A1Switch 1. Common terminal 1.
4, 10, 18, 27,
38, 50, 56VDDPositive-Supply Voltage Input. Bypass VDD to GND with a 0.1µF ceramic capacitor
(see the Power-Supply Bypassing section).N.C.No Connection. Not internally connected.A2Switch 2. Common terminal 2.A3Switch 3. Common terminal 3.A4Switch 4. Common terminal 4.A5Switch 5. Common terminal 5.A6Switch 6. Common terminal 6.A7Switch 7. Common terminal 7.SELSelect Input. SEL selects switch connection. See the truth table (Table 1).LED0LED0 InputLED1LED1 Input0LED10LED1 Output. Drive SEL low (SEL = 0) to connect LED0 to 0LED1.1LED11LED1 Output. Drive SEL low (SEL = 0) to connect LED1 to 1LED1.0LED20LED2 Output. Drive SEL high (SEL = 1) to connect LED0 to 0LED2.1LED21LED2 Output. Drive SEL high (SEL = 1) to connect LED1 to 1LED2.7B2Switch 7. Normally open terminal 7.6B2Switch 6. Normally open terminal 6.7B1Switch 7. Normally closed terminal 7.6B1Switch 6. Normally closed terminal 6.5B2Switch 5. Normally open terminal 5.4B2Switch 4. Normally open terminal 4.5B1Switch 5. Normally closed terminal 5.4B1Switch 4. Normally closed terminal 4.3B2Switch 3. Normally open terminal 3.2B2Switch 2. Normally open terminal 2.3B1Switch 3. Normally closed terminal 3.2B1Switch 2. Normally closed terminal 2.1B2Switch 1. Normally open terminal 1.0B2Switch 0. Normally open terminal 0.1B1Switch 1. Normally closed terminal 1.0B1Switch 0. Normally closed terminal 0.
MAX4927
1000 Base-T, ±15kV ESD Protection LAN Switch
Detailed DescriptionThe MAX4927 is a high-speed analog switch targeted
for 1000 Base-T applications. In a typical application,
the MAX4927 switches the signals from two separate
interface transformers and connects the signals to a
single 1000 Base-T Ethernet PHY (see the Typical
Operating Circuit). This configuration simplifies docking-
station design by avoiding signal reflections associated
with unterminated transmission lines in a T configura-
tion. The MAX4927 is protected against ±15kV electro-
static discharge (ESD) events. The MAX4927 also
includes LED switches that allow the LED output sig-
nals to be routed to a docking station along with the
Ethernet signals. See the Functional Diagrams.
With its low resistance and capacitance, as well as high
ESD protection, the MAX4927 can be used to switch
most low-voltage differential signals, such as LVDS,
SERDES, and LVPECL, as long as the signals do not
exceed maximum ratings of the device.
The MAX4927switch provides an extremely low capac-
itance and on-resistance to meet Ethernet insertion and
return-loss specifications. The MAX4927 features three
built-in LED switches.
The MAX4927incorporates a unique architecture design
utilizing only n-channel switches within the main Ethernet
switch, reducing I/O capacitance and channel resis-
tance. An internal two-stage charge pump with a nomi-
nal 7.5V output provides the high voltage needed to
drive the gates of the n-channel switches while maintain-
ing a consistently low RONthroughout the input signal
range. An internal bandgap reference set to 1.23V and
an internal oscillator running at 2.5MHz provide proper
charge-pump operation. Unlike other charge-pump cir-
cuits, the MAX4927 includes internal flyback capacitors,
reducing design time, board space, and cost.
Digital Control InputsThe MAX4927 provides a single digital control input,
SEL. SEL controls the high-frequency switches as well
as the LED switches as shown in Table 1.
Analog Signal LevelsThe on-resistance of the MAX4927 is very low and sta-
ble as the analog input signals are swept from ground
to VDD(see the Typical Operating Characteristics). The
switches are bidirectional, allowing A_ and _B_ to be
configured as either inputs or outputs.
±15kV ESD ProtectionAs with all Maxim devices, ESD-protection structures
are incorporated on all pins to protect against electro-
static discharges encountered during handling and
assembly. All the high-frequency switch inputs (A_,
_B_), LED switch inputs (LED_, _LED_), and SEL have
high ESD protection against static electricity. Maxim’s
engineers have developed state-of-the-art structures to
protect these pins against ESD of ±15kV without dam-
age. After an ESD event, the MAX4927 keeps working
without latchup or damage.
ESD protection can be tested in various ways. All signal
and control inputs of the MAX4927 are characterized
for protection to the following limits:±15kV using the Human Body Model±8kV using the Contact Discharge Method specified
in IEC 61000-4-2±15kV using the Air-Gap Discharge Method specified
in IEC 61000-4-2
ESD Test ConditionsESD performance depends on a variety of conditions.
Contact Maxim for a reliability report that documents
test setup, test methodology, and test results.
PINNAMEFUNCTION2LED22LED2 Output. Drive SEL high (SEL = 1) to connect LED2 to 2LED2.2LED12LED1 Output. Drive SEL low (SEL = 0) to connect LED2 to 2LED1.LED2LED2 InputEPExposed Paddle. Connect EP to GND or leave EP unconnected.
Pin Description (continued)
SELCONNECTIONA_ to _B1, LED_ to _LED1A_ to _B2, LED_ to _LED2
Table 1. Truth Table
