General Description
The MAX4890/MAX4891/MAX4892 high-speed analog switches meet the needs of 10/100/1000 Base-T appli-cations. These devices switch the signals from two interface transformers and connect the signals to a sin-gle 10/100/1000 Base-T Ethernet PHY, simplifying docking station design and reducing manufacturing costs. The MAX4890/MAX4891/MAX4892 can also route signals from a common interface transformer to two different boards in board-redundancy applications. The MAX4890/MAX4891/MAX4892 switches provide an extremely low capacitance and on-resistance to meet Ethernet insertion and return-loss specifications. The MAX4891/MAX4892 feature one and three built-in LED switches, respectively.The MAX4890/MAX4891/MAX4892 are available in space-saving 32- and 36-lead TQFN packages, significantly reducing the required PC board area. These devices operate over the -40°C to +85°C tem-perature range.
Applications
Notebooks and Docking StationsServers and Routers with Ethernet Interfaces Board-Level Redundancy Protection
SONET/SDH Signal Routing T3/E3 Redundancy Protection Video Switching
Features
♦ Single +3.0V to +3.6V Power-Supply Voltage ♦ Low On-Resistance (RON): 4Ω (typ), 6.5Ω (max) ♦ Ultra-Low On-Capacitance (CON): 6.5pF (typ) ♦ Low < 200ps Bit-to-Bit Skew♦ -3dB Bandwidth: 1GHz
♦ Optimized Pin-Out for Easy Transformer and PHY Interface
♦ Built-In LED Switches for Switching Indicators to Docking Station
♦ Low 450µA (max) Quiescent Current
♦ Bidirectional 8 to 16 Multiplexer/Demultiplexer ♦ Space-Saving Packages
32-Pin, 5mm x 5mm, TQFN Package 36-Pin, 6mm x 6mm, TQFN Package
MAX4890/MAX4891/MAX4892
10/100/1000 Base-T Ethernet LAN Switch
________________________________________________________________Maxim Integrated Products 1
32 31 30 29 28 27 26 9 10 11 12 13 14 15 18 19 20 21 22 23 24 7 6 5 4 3 2 1 MAX4890 TQFN TOP VIEW A3 A2 N.C. N.C. N.C. N.C. A4 8 A5 A 1 A0 V+ SEL 0B1 1B1 0B2 25 1B 2 2B1 3B1 2B2 3B2 4B1 5B1 4B2 17 5B2
*EP = EXPOSED PAD. CONNECT EP TO GND OR LEAVE UNCONNECTED
7B 1 6B 2 16 6B 1 7B 2 N .C . G N D A 7 A 6 *EP
Pin Configurations
Ordering Information
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
PART PIN-PACKAGE LED SWITCHES
MAX4890ETJ 32 TQFN-EP* —
MAX4891ETJ 32 TQFN-EP* 1
MAX4892ETX 36 TQFN-EP* 3
Note: All devices are specified for operation in the -40°C to
+85°C temperature range. *EP = Exposed pad.
Functional Diagrams and Typical Operating Circuit appear at end of data sheet.
MAX4890/MAX4891/MAX4892
ABSOLUTE MAXIMUM RATINGS
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.
V+ ...-0.3V to +4V SEL (Note 1) ...-0.3V to (V+ +0.3V) A_, _B_, LED_, _LED_ ...-0.3V to (V+ +0.3V) Continuous Current (A_ to _B_) ...±120mA Continuous Current (LED_ to _LED_) ...±30mA Peak Current (A_ to _B_)
(pulsed at 1ms, 10% duty cycle)...±240mA
Continuous Power Dissipation (TA= +70°C)
32-Pin TQFN (derate 34.5mW/°C above +70°C) ...2.76W 36-Pin TQFN (derate 26.3mW/°C above +70°C) ...2.11W 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
(V+ = +3V to +3.6V, TA= TMINto TMAX, unless otherwise noted. Typical values are at V+ = 3.3V, TA= +25°C.) (Note 2)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
ANALOG SWITCH TA = +25°C 4 5.5 On-Resistance RON V+ = 3V, IA_ = -40mA, 1.5V ≤ VA_ ≤ V+ TMIN to TMAX 6.5 Ω On-Resistance
LED Switches RONLED
V+ = 3V, I_LED_ = -40mA, 1.5V ≤ VA_ ≤ V+, MAX4891/MAX4892 40 Ω TA = +25°C 0.5 1.5 On-Resistance Match Between Channels ΔRON V+ = 3V, IA_= -40mA, 1.5V ≤ VA_ ≤ V+
(Note 3) TMIN to TMAX 2
Ω On-Resistance Flatness RFLAT(ON) V+ = 3V, IA_ = -40mA, VA_ = 1.5V, 2.7V 0.01 Ω
Off-Leakage Current ILA_(OFF) V+ = 3.6V, VV A_ = 0.3V, 3.3V
_B1 or V_B2 = 3.3V, 0.3V -1 +1
On-Leakage Current ILA_(ON) V+ = 3.6V, VA_= 0.3V, 3.3V
V_B1 or V_B2 = 0.3V, 3.3V or floating -1 +1
µA
ESD PROTECTION
ESD Protection Human Body Model ±2 kV
SWITCH AC PERFORMANCE
Insertion Loss ILOS
Insertion loss with typical transformer, RL = 100Ω, 1MHz < f < 100MHz, Figure 1 (Note 3) 0.6 dB RLOS1 1MHz < f < 40MHz -19 Return Loss RLOS2
Return loss with typical transformer, RL = 100Ω, return loss, f in MHz, Figure 2 (Note 3) 40MHz < f < 100MHz -13 +20log (f/80) dB
Note 1: Signals on SEL, exceeding V+ or GND, are clamped by internal diodes. Limit forward-diode current to maximum current
MAX4890/MAX4891/MAX4892
ELECTRICAL CHARACTERISTICS (continued)
(V+ = +3V to +3.6V, TA= TMINto TMAX, unless otherwise noted. Typical values are at V+ = 3.3V, TA= +25°C.) (Note 2)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
VCT1 1MHz < f < 30MHz -45
VCT2 30MHz < f < 60MHz -40
Crosstalk
VCT3
Any switch to any switch RL = 100Ω, Figure 3 60MHz < f < 100MHz -35 dB VDCT1 1MHz < f < 30MHz -60 VDCT2 30MHz < f < 60MHz -55 Differential Crosstalk VDCT3 RL = 100Ω, Figure 4 60MHz < f < 100MHz -50 dB SWITCH DYNAMICS
On-Channel -3dB Bandwidth BW RL = 100Ω, Differential pair 1000 MHz
Off-Capacitance COFF f = 1MHz, _B_ inputs 3.5 pF
On-Capacitance CON f = 1MHz, _B_ inputs 6.5 pF
Off-Capacitance, LED Switches COFFLED f = 1MHz, _LED inputs 20 pF
On-Capacitance, LED Switches CONLED f = 1MHz, _LED inputs 22 pF
Turn-On Time tON VA_ = 1V, Figure 5 25 50 ns
Turn-Off Time tOFF VA_ = 1V, Figure 5 20 40 ns
Propagation Delay tPLH, tPHL CL = 10pF, Figure 6 0.15 ns
Output Skew Between Ports tSK(o) Skew between A4 and A5 and any other
port, Figure 7 0.01 ns
Output Skew Same Port tSK(p) Skew between opposite transitions in same
port 0.07 ns
SWITCH LOGIC
Input-Voltage Low VIL 0.8
Input-Voltage High VIH 2.0
V
Input-Logic Hysteresis VHYST 100 mV
Input Leakage Current ISEL V+ = 3.6V, VSEL = 0 or V+ -5 +5 uA
Operating Supply-Voltage Range V+ 3 3.6 V
Quiescent Supply Current I+ V+ = 3.6V, VSEL = 0 or V+ 280 450 µA
Note 2: Specifications at -40°C are guaranteed by design. Note 3: Guaranteed by design.
MAX4890/MAX4891/MAX4892
Typical Operating Characteristics
(V+ = 3.3V, TA= +25°C, unless otherwise noted.)
3.0 3.2 3.6 3.4 3.8 4.0 ON-RESISTANCE vs. VA_ MAX4890 toc01 VA_ (V) RON (Ω ) 0 0.9 1.8 2.7 3.6 V+ = 3.0V, 3.3V, 3.6V 0 1 3 2 4 5 ON-RESISTANCE vs. VA_ MAX4890 toc02 VA_ (V) RON (Ω ) 0 1.1 2.2 3.3 TA = +85°C TA = -40°C TA = +25°C 0 6 4 2 8 10 12 14 16 18 20 0 0.9 1.8 2.7 3.6 LED_ ON-RESISTANCE vs. VA_ MAX4890 toc03 VA_ (V) RONLED (Ω ) V+ = 3.6V V+ = 3.3V V+ = 3.0V 0 6 4 2 8 10 12 14 16 18 20 0 1.1 2.2 3.3
LED_ ON-RESISTANCE vs. TEMPERATURE
MAX4890 toc04 VA_ (V) RONLED (Ω ) TA = +25°C TA = -40°C TA = +85°C 0 400 200 1000 800 600 1600 1400 1200 1800 -40 -15 10 35 60 85
LEAKAGE CURRENT vs. TEMPERATURE
MAX4890 toc05
TEMPERATURE (°C)
LEAKAGE CURRENT (pA)
ILA_(ON) ILA_(OFF) 0 100 5 20 15 25 30 0 1.1 2.2 3.3 CHARGE INJECTION vs. VA_ MAX4890 toc06 VA_ (V) CHARGE INJECTION (pC) 150 210 190 170 230 250 270 290 310 330 350 -40 -15 10 35 60 85
QUIESCENT SUPPLY CURRENT vs. TEMPERATURE
MAX4890 toc07
TEMPERATURE (°C)
QUIESCENT SUPPLY CURRENT (
μ A) 0 400 200 800 600 1000 1200 0 1.1 2.2 3.3
QUIESCENT SUPPLY CURRENT vs. LOGIC LEVEL
MAX4890 toc08
LOGIC LEVEL (V)
QUIESCENT SUPPLY CURRENT (
μ A) 0 0.4 0.2 1.0 0.8 0.6 1.6 1.4 1.2 1.8 3.0 3.1 3.2 3.3 3.4 3.5 3.6
LOGIC THRESHOLD vs. SUPPLY VOLTAGE
MAX4890 toc09
SUPPLY VOLTAGE (V)
LOGIC THRESHOLD (V)
VTH+
TH-MAX4890/MAX4891/MAX4892
0 5 15 10 20 25 TURN-ON/-OFF TIME vs. SUPPLY VOLTAGE MAX4890 toc10 SUPPLY VOLTAGE (V) tON /tOFF (ns) 3.0 3.2 3.4 3.6 tON tOFF 0 10 5 20 15 25 30 -40 -15 10 35 60 85 TURN-ON/-OFF TIME vs. TEMPERATURE MAX4890 toc11 TEMPERATURE (°C) tON /tOFF (ns) tON tOFF 50 100 150 200 250 3.0 3.3 3.6RISE-/FALL-TIME PROPAGATION DELAY vs. SUPPLY VOLTAGE
MAX4890 toc12
SUPPLY VOLTAGE (V)
OUTPUT RISE/FALL-TIME DELAY (ps)
tPLH tPHL 250 200 150 100 50 -40 -15 10 35 60 85
RISE-/FALL-TIME PROPAGATION DELAY vs. TEMPERATURE
MAX4890 toc13
TEMPERATURE (°C)
OUTPUT RISE-/FALL-TIME DELAY (ps)
tPLH tPHL 0 20 60 40 80 100
PULSE SKEW vs. SUPPLY VOLTAGE
MAX4890 toc14 SUPPLY VOLTAGE (V) PULSE SKEW (ps) 3.0 3.3 3.6 tSK(p) 0 20 60 40 80 100 -40 -15 10 35 60 85
PULSE SKEW vs. TEMPERATURE
MAX4890 toc15 TEMPERATURE (°C) PULSE SKEW (ps) tSK(p) -20 -10 0 10 20 3.0 3.3 3.6 OUTPUT SKEW vs. SUPPLY VOLTAGE MAX4890 toc16 SUPPLY VOLTAGE (V) OUTPUT SKEW (ps) tSK(o)_FALL tSK(o)_RISE 20 10 0 -10 -20 -40 -15 10 35 60 85
OUTPUT SKEW vs. TEMPERATURE
MAX4890 toc17
TEMPERATURE (°C)
OUTPUT SKEW (ps)
tSK(o)_FALL
tSK(o)_RISE
DIFFERENTIAL INSERTION LOSS vs. FREQUENCY
MAX4890 toc18
FREQUENCY (MHz)
DIFFERENTIAL INSERTION LOSS (dB)
10 -4 -3 -2 -1 0 1 -5 1 100
Typical Operating Characteristics (continued)
MAX4890/MAX4891/MAX4892
DIFFERENTIAL RETURN LOSS vs. FREQUENCY
MAX4890 toc19
FREQUENCY (MHz)
DIFFERENTIAL RETURN LOSS (dB)
10 -30 -20 -10 0 -40 1 100 DIFFERENTIAL CROSSTALK vs. FREQUENCY MAX4890 toc20 FREQUENCY (MHz) DIFFERENTIAL CROSSTALK (dB) 10 -90 -80 -70 -60 -50 -40 -30 -20 -10 0 -100 1 100 SINGLE-ENDED OFF-ISOLATION vs. FREQUENCY MAX4890 toc21 FREQUENCY (MHz) SINGLE-ENDED OFF-ISOLATION (dB) 10 -90 -80 -70 -60 -50 -40 -30 -20 -10 0 -100 1 100 SINGLE-ENDED CROSSTALK vs. FREQUENCY MAX4890 toc22 FREQUENCY (MHz) SINGLE-ENDED CROSSTALK (dB) 10 -90 -80 -70 -60 -50 -40 -30 -20 -10 0 -100 1 100
SINGLE-ENDED INSERTION LOSS vs. FREQUENCY
MAX4890 toc23
FREQUENCY (MHz)
SINGLE-ENDED INSERTION LOSS (dB)
100 10 -4 -3 -2 -1 0 -5 1 1000
Typical Operating Characteristics (continued)
MAX4890/MAX4891/MAX4892
Pin Description
PIN
MAX4890 MAX4891 MAX4892 NAME FUNCTION
31, 32, 1, 2, 7–10
31, 32, 1, 2, 7–10
36, 1, 2, 3,
7–10 A0–A7 Differential PHY Interface Pair. Connects to the Ethernet PHY.
— 3 4 LED0 LED0 Input
— 4 5 0LED1 0LED1 Output. Connects LED0 to 0LED1 when SEL = 0. — 5 6 0LED2 0LED2 Output. Connects LED0 to 0LED2 when SEL = 1. 3–6, 12 6, 12 — N.C. No Connection. Not internally connected.
11 11 11 GND Ground
— — 12 LED1 LED1 Input
— — 13 1LED1 1LED1 Output. Connects LED1 to 1LED1 when SEL = 0. — — 14 1LED2 1LED2 Output. Connects LED1 to 1LED2 when SEL = 1. 13, 14, 17, 18, 21, 22, 25, 26 13, 14, 17, 18, 21, 22, 25, 26 15, 16, 19, 20, 23, 24, 28, 29
7B2–0B2 B2 Differential Transformer Pair
15, 16, 19, 20, 23, 24, 27, 28 15, 16, 19, 20, 23, 24, 27, 28 17, 18, 21, 22, 25, 26, 30, 31
7B1–0B1 B1 Differential Transformer Pair
29 29 27 SEL Select Input. Selects switch connection. See the Truth Table (Table 1). — — 32 2LED2 2LED2 Output. Connects LED2 to 2LED2 when SEL = 1.
— — 33 2LED1 2LED1 Output. Connects LED2 to 2LED1 when SEL = 0.
— — 34 LED2 LED2 Input
30 30 35 V+ Positive Supply-Voltage Input
— — — EP Exposed Paddle. Not internally connected. Leave EP unconnected or connect to ground.
MAX4890/MAX4891/MAX4892
Test Circuits
A0 36 A1 1 3B1 50Ω TRACE 50Ω TRACE C2 0.01μF 5 4 6 PULSE H5007 24-PIN PACKAGE 20 21 19 C3 1000pF R1 75Ω CB3 50Ω TRACE 50Ω TRACE 4 5 6 100:50 MINI CKT BALUN 3 1 50Ω TRACE NETWORK ANALYZER INSERTION LOSS 1 MINI CKT BALUN 6 50TRACEΩ 0B1 50Ω TRACE 5 4 3 50:100 CB1 50Ω TRACE NETWORK ANALYZER MAX4892 36 TQFN 31 30Figure 1. Differential Insertion Loss
R17 49.9Ω R16 49.9Ω A2 2 A3 3 3B1 25 50Ω TRACE 50Ω TRACE C2 0.01μF 5 4 6 PULSE H5007 24-PIN PACKAGE 20 21 19 C3 1000pF R1 75Ω CB3 50Ω TRACE 50Ω TRACE 4 5 6 100:50 MINI CKT BALUN 3 1 TRACE50Ω NETWORK ANALYZER RETURN LOSS MAX4892 36 TQFN
Detailed Description
The MAX4890/MAX4891/MAX4892 are high-speed ana-log switches targeted for 10/100/1000 Base-T applica-tions. In a typical application, the MAX4890/MAX4891/ MAX4892 switch the signals from two separate inter-face transformers and connect the signals to a single 10/100/1000 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 MAX4891 and MAX4892 also include LED switches that allow the LED output signals to be routed to a docking station along with the Ethernet signals. See the Functional Diagrams.The MAX4890/MAX4891/MAX4892 switches provide an extremely low capacitance and on-resistance to meet Ethernet insertion and return-loss specifica-tions. The MAX4891/MAX4892 feature one and three built-in LED switches, respectively.
The MAX4890/MAX4891/MAX4892 incorporate a unique architecture design utilizing only n-channel switches
within the main Ethernet switch, reducing I/O capaci-tance and channel resiscapaci-tance. An internal two-stage charge pump with a nominal output of 7.5V provides the high voltage needed to drive the gates of the n-channel switches, while maintaining a consistently low RON
throughout 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 circuits, the MAX4890/ MAX4891/MAX4892 include internal flyback capacitors, reducing design time, board space, and cost.
Digital Control Inputs
The MAX4890/MAX4891/MAX4892 provide a single digital control SEL. SEL controls the switches as well as the LED switches as shown in Table 1.
MAX4890/MAX4891/MAX4892
SEL CONNECTION
0 A_ to _B1, LED_ to _LED1 1 A_ to _B2, LED_ to _LED2
Table 1. Truth Table
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 A0 36 A2 2 A3 3 A4 7 4B1 22 3B1 25 2B1 26 0B1 31 50Ω TRACE NETWORK ANALYZER NETWORK ANALYZER 50Ω TRACE R14 49.9Ω R13 49.9Ω MAX4892 36 TQFNFigure 3. Single-Ended Bandwidth, Crosstalk and Off-Isolation
MAX4890/MAX4891/MAX4892
Analog Signal LevelsThe on-resistance of the MAX4890/MAX4891/MAX4892 is very low and stable as the analog input signals are swept from ground to V+ (see the Typical Operating Characteristics). The switches are bidirectional, allow-ing A_ and _B_ to be configured as either inputs or out-puts.
ESD Protection
The MAX4890/MAX4891/MAX4892 are characterized using the Human Body Model for ±2kV of ESD protec-tion. Figure 8 shows the Human Body Model, and Figure 9 shows the current waveform the Human Body Model generates when discharged into a low-impedance load. This model consists of a 100pF capacitor charged to the ESD voltage of interest, which is then discharged into the test device through a 1.5kΩ resistor.Applications Information
Typical Operating Circuit
The Typical Operating Circuit depicts the MAX4890/ MAX4891/MAX4892 in a 10/100/1000 Base-T docking station application.
Line-Card Redundancy (Ethernet T3/E3)
Figure 10 shows the MAX4890/MAX4891/MAX4892 in a line-card redundancy configuration.
Power-Supply Sequencing and Overvoltage Protection Caution: Do not exceed the absolute maximum ratings. Stresses beyond the listed ratings may cause perma-nent 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 design-controlled-impedance printed circuit board traces as short as possible. Ensure that bypass capacitors are as close to the device as possible. Use large ground planes where possible.
Figure 4. Differential Crosstalk
1 3 MINI CKT BALUN 6 4 NETWORK ANALYZER R4 49.9Ω R3 49.9Ω 1 3 MINI CKT BALUN 6 4 R4 49.9Ω R3 49.9Ω 50Ω TRACE 50:100 NETWORK ANALYZER 50Ω TRACE 5 50:100 CB5 CB4 50Ω TRACE 50Ω TRACE A4 7 A5 8 AB1 22 5B1 21 6B1 18 7B1 17 A6 9 A7 10 DIFFERENTIAL CROSSTALK TRANSMIT CKT
DIFFERENTIAL CROSSTALK RECEIVE CKT
MAX4892 36-TQFN
MAX4890/MAX4891/MAX4892
2.5V 0V 1.25V A_ tOFF 90% 0V tON 90% 0V A_ tON 90% tOFF 10% 1.25V SELFigure 5. ENABLE and DISABLE Times
2.0V 3.0V
1.0V
THE MAX4890/MAX4891/MAX4892 SWITCHES ARE FULLY BIDIRECTIONAL.
tPHL VOH VOL 2.0V tPLH A_ _B_ PULSE SKEW = tSK(p) = |tPHL - tPLH|
Figure 6. Propagation Delay Times
2.0V 3.0V
1.0V
THE MAX4890/MAX4891/MAX4892 SWITCHES ARE FULLY BIDIRECTIONAL. tPHLX VOH VOL 2.0V tPLHX A_ _B_
PULSE SKEW = tSK(p) = |tPHLY - tPLHX| OR |tPHLy - tPHLx|
tPHLY VOH VOL 2.0V tPLHY _B_
Figure 7. Output Skew
CHARGE-CURRENT LIMIT RESISTOR DISCHARGE RESISTANCE STORAGE CAPACITOR Cs 100pF RC 1MΩ RD 1500Ω HIGH-VOLTAGE DC SOURCE DEVICE UNDER TEST
MAX4890/MAX4891/MAX4892
IP 100% 90% 36.8% tRL TIME tDL CURRENT WAVEFORM PEAK-TO-PEAK RINGING (NOT DRAWN TO SCALE) Ir10% 0 0 AMPERES
Figure 9. Human Body Model Current Waveform
PROTECTION SWITCH TRANSFORMER MAX4890 MAX4891 MAX4892 ETHERNET PHYs OR T3/E3 LIUs PROTECTION CARD ETHERNET PHYs OR T3/E3 LIUs PRIMARY CARD SWITCHING CARD
MAX4890/MAX4891/MAX4892
NOTEBOOK DOCKING STATION ETHERNET PHY/MAC M A X 48 90 /M A X 48 91 /M A X 48 92 TRD0_P TRD0_N TRD1_P TRD1_N TRD2_P TRD2_N TRD3_P TRD3_N A0 A1 A2 A3 A4 A5 A6 A7 SEL_DOCK SEL _LED2 6B2 7B2 4B2 5B2 2B2 3B2 0B2 1B2 LED_ _LED1 0B1 1B1 2B1 3B1 4B1 5B1 6B1 7B1 LED_OUT RJ-45 TR A N S FO R M ER TR A N S FO R M ER LED CONNECTOR RJ-45 LEDMAX4890/MAX4891/MAX4892
Functional Diagrams
0B1 1B1 0B2 1B2 2B1 3B1 2B2 3B2 6B2 7B2 6B1 7B1 4B2 5B2 4B1 5B1 A0 A1 A2 A3 A4 A5 A6 A7 SEL MAX4890 0B1 1B1 0B2 1B2 2B1 3B1 2B2 3B2 6B2 7B2 6B1 7B1 4B2 5B2 4B1 5B1 A0 A1 A2 A3 A4 A5 A6 A7 SEL MAX4891 LED0 0LED1 0LED2MAX4890/MAX4891/MAX4892
Functional Diagrams (continued)
0B1 1B1 0B2 1B2 2B1 3B1 2B2 3B2 6B2 7B2 6B1 7B1 4B2 5B2 4B1 5B1 A0 A1 A2 A3 A4 A5 A6 A7 SEL MAX4892 LED0 0LED1 0LED2 LED1 LED2 1LED1 1LED2 2LED1 2LED2
MAX4890/MAX4891/MAX4892
Chip Information
PROCESS: BiCMOS 32 31 30 29 28 27 26 9 10 11 12 13 14 15 18 19 20 21 22 23 24 7 6 5 4 3 2 1 MAX4891 TQFN TOP VIEW A3 A2 LED0 0LED1 0LED2 N.C. A4 8 A5 A 1 A0 V+ SEL 0B1 1B1 0B2 25 1B 2 2B1 3B1 2B2 3B2 4B1 5B1 4B2 17 5B2 7B 1 6B 2 16 6B 1 7B 2 N .C . G N D A 7 A 6 TQFN SEL 2B1 2B2 3B2 4B2 5B2 4B1 5B1 3B1 A3 LED0 0LED1 A4 A5 A6 A1 1 2 3 4 5 6 7 8 9 27 26 25 24 23 22 21 20 19 1LED2 7B2 6B2 6B1 1LED1 LED1 GND A7 MAX4892 0LED2 7B1 A2 A 0 10 11 12 13 14 15 16 17 18 36 35 34 33 32 31 30 29 28 0B 2 V + LE D 2 2L ED 1 2L ED 2 0B 1 1B 1 1B 2 *EP *EP*EP = EXPOSED PAD. CONNECT EP TO GND OR LEAVE UNCONNECTED *EP = EXPOSED PAD. CONNECT EP TO GND OR LEAVE UNCONNECTED
Pin Configurations (continued)
Package Information
For the latest package outline information and land patterns, go to www.maxim-ic.com/packages.
PACKAGE TYPE PACKAGE CODE DOCUMENT NO.
32 TQFN-EP T-3255-4 21-0140
MAX4890/MAX4891/MAX4892
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 ____________________ 17
Revision History
REVISION NUMBER REVISION DATE DESCRIPTION PAGES CHANGED1 8/05 Removed future product part number —
