Datasheet

ManualsBrandsMAXIM INTEGRATED ManualsInterface ICsInterface IC - analogue switches TQFN 32 EP

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 Stations

Servers 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 (R

): 4Ω (typ), 6.5Ω (max)

♦ Ultra-Low On-Capacitance (C

): 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

32 31 30 29 28 27 26

9 101112131415

MAX4890

TQFN

TOP VIEW

N.C.

2B1

3B1

2B2

3B2

4B1

5B1

4B2

5B2

*EP = EXPOSED PAD. CONNECT EP TO GND OR LEAVE UNCONNECTED

*EP

Pin Configurations

Ordering Information

19-3577; Rev 2; 8/07

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.

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.

Pin Configurations continued at end of data sheet.

Summary of content (17 pages)

PAGE 1
9-3577; Rev 2; 8/07 10/100/1000 Base-T Ethernet LAN Switch The MAX4890/MAX4891/MAX4892 high-speed analog switches meet the needs of 10/100/1000 Base-T applications. These devices switch the signals from two interface transformers and connect the signals to a single 10/100/1000 Base-T Ethernet PHY, simplifying docking station design and reducing manufacturing costs.
PAGE 2
MAX4890/MAX4891/MAX4892 10/100/1000 Base-T Ethernet LAN Switch ABSOLUTE MAXIMUM RATINGS 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_) ...............................
PAGE 3
10/100/1000 Base-T Ethernet LAN Switch (V+ = +3V to +3.6V, TA = TMIN to TMAX, unless otherwise noted. Typical values are at V+ = 3.3V, TA = +25°C.
PAGE 4
Typical Operating Characteristics (V+ = 3.3V, TA = +25°C, unless otherwise noted.) 20 MAX4890 toc02 MAX4890 toc01 3.8 LED_ ON-RESISTANCE vs. VA_ ON-RESISTANCE vs. VA_ 5 4 MAX4890 toc03 ON-RESISTANCE vs. VA_ 4.0 V+ = 3.0V 18 16 14 3 RONLED (Ω) 3.6 RON (Ω) RON (Ω) V+ = 3.0V, 3.3V, 3.6V TA = +85°C TA = +25°C 3.4 2 3.2 1 3.0 0 TA = -40°C 12 10 V+ = 3.3V V+ = 3.6V 8 6 4 2 1.8 2.7 3.6 0 0 1.1 2.2 VA_ (V) 12 TA = +25°C TA = -40°C 6 1400 2.7 3.6 CHARGE INJECTION vs.
PAGE 5
10/100/1000 Base-T Ethernet LAN Switch RISE-/FALL-TIME PROPAGATION DELAY vs. SUPPLY VOLTAGE TURN-ON/-OFF TIME vs. TEMPERATURE tON 25 15 tOFF 10 20 15 tOFF 10 5 5 0 3.4 3.6 -40 -15 10 SUPPLY VOLTAGE (V) 60 3.0 PULSE SKEW vs. SUPPLY VOLTAGE tSK(p) 80 PULSE SKEW (ps) 200 150 100 60 60 40 tSK(p) 80 40 0 3.3 3.6 -40 -15 10 35 60 TEMPERATURE (°C) SUPPLY VOLTAGE (V) TEMPERATURE (°C) OUTPUT SKEW vs. SUPPLY VOLTAGE OUTPUT SKEW vs. TEMPERATURE DIFFERENTIAL INSERTION LOSS vs.
PAGE 6
Typical Operating Characteristics (continued) (V+ = 3.3V, TA = +25°C, unless otherwise noted.) -20 -30 -40 1 MAX4890 toc20 -20 -30 -40 -50 -60 -70 -80 -20 -30 -40 -50 -60 -70 -80 -90 -100 -100 1 1 100 10 FREQUENCY (MHz) 10 FREQUENCY (MHz) FREQUENCY (MHz) SINGLE-ENDED CROSSTALK vs. FREQUENCY SINGLE-ENDED INSERTION LOSS vs.
PAGE 7
10/100/1000 Base-T Ethernet LAN Switch PIN MAX4890 MAX4891 31, 32, 1, 2, 31, 32, 1, 2, 7–10 7–10 MAX4892 36, 1, 2, 3, 7–10 NAME FUNCTION 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.
PAGE 8
MAX4890/MAX4891/MAX4892 10/100/1000 Base-T Ethernet LAN Switch Test Circuits MAX4892 36 TQFN INSERTION LOSS 1 NETWORK ANALYZER MINI CKT BALUN 50Ω TRACE 6 50Ω 0B1 TRACE A0 36 50Ω TRACE 3 50:100 50Ω 3B1 TRACE 30 50Ω TRACE A1 1 4 5 31 5 PULSE H5007 24-PIN PACKAGE 50Ω TRACE 20 4 21 6 19 4 MINI CKT BALUN 3 5 50Ω TRACE CB1 100:50 R1 75Ω C2 0.01μF 50Ω 1 TRACE 6 CB3 C3 1000pF Figure 1. Differential Insertion Loss RETURN LOSS MAX4892 36 TQFN R16 49.9Ω R17 49.
PAGE 9
10/100/1000 Base-T Ethernet LAN Switch MAX4892 SINGLE-ENDED BANDWIDTH NETWORK ANALYZER 50Ω TRACE SINGLE-ENDED CROSSTALK NETWORK ANALYZER NETWORK ANALYZER 50Ω TRACE A2 2 50Ω TRACE NETWORK ANALYZER 2B1 26 R13 49.9Ω 50Ω TRACE A3 3 3B1 25 R14 49.9Ω SINGLE-ENDED OFF-ISOLATION NETWORK ANALYZER 36 TQFN 0B1 31 A0 36 50Ω TRACE A4 7 4B1 22 50Ω TRACE NETWORK ANALYZER R15 49.9Ω Figure 3.
PAGE 10
MAX4890/MAX4891/MAX4892 10/100/1000 Base-T Ethernet LAN Switch DIFFERENTIAL CROSSTALK TRANSMIT CKT 1 MINI CKT BALUN MAX4892 36-TQFN AB1 22 A4 6 7 NETWORK ANALYZER 5B1 21 50Ω TRACE 3 R3 49.9Ω A5 4 8 50:100 R4 49.9Ω CB4 DIFFERENTIAL CROSSTALK RECEIVE CKT NETWORK ANALYZER 50Ω TRACE 1 MINI CKT BALUN 6 50Ω TRACE A6 9 5 50Ω TRACE A7 10 4 3 6B1 18 50:100 7B1 17 R3 49.9Ω R4 49.9Ω CB5 Figure 4.
PAGE 11
10/100/1000 Base-T Ethernet LAN Switch 2.5V 1.25V MAX4890/MAX4891/MAX4892 SEL 3.0V 2.0V 1.25V 0V A_ 1.0V tON A_ tPHL tPLH 90% tOFF VOH 90% 0V 2.0V tON _B_ VOL A_ 90% PULSE SKEW = tSK(p) = |tPHL - tPLH| tOFF THE MAX4890/MAX4891/MAX4892 SWITCHES ARE FULLY BIDIRECTIONAL. 10% 0V Figure 5. ENABLE and DISABLE Times Figure 6. Propagation Delay Times 3.0V 2.0V A_ 1.0V RC 1MΩ tPHLX tPLHX CHARGE-CURRENT LIMIT RESISTOR VOH 2.
PAGE 12
MAX4890/MAX4891/MAX4892 10/100/1000 Base-T Ethernet LAN Switch IP 100% 90% Ir PEAK-TO-PEAK RINGING (NOT DRAWN TO SCALE) ETHERNET PHYs OR T3/E3 LIUs PRIMARY CARD MAX4890 MAX4891 MAX4892 AMPERES PROTECTION SWITCH 36.8% 10% 0 0 tRL TIME tDL CURRENT WAVEFORM ETHERNET PHYs OR T3/E3 LIUs TRANSFORMER SWITCHING CARD PROTECTION CARD Figure 9. Human Body Model Current Waveform 12 Figure 10.
PAGE 13
10/100/1000 Base-T Ethernet LAN Switch DOCKING STATION TRANSFORMER RJ-45 LED CONNECTOR NOTEBOOK 0B2 1B2 2B2 3B2 TRD1_P TRD1_N A2 A3 TRD2_P TRD2_N A4 A5 TRD3_P TRD3_N A6 A7 ETHERNET PHY/MAC LED_OUT 4B2 5B2 _LED2 0B1 1B1 2B1 3B1 4B1 5B1 RJ-45 6B1 7B1 LED_ SEL SEL_DOCK 6B2 7B2 TRANSFORMER A0 A1 MAX4890/MAX4891/MAX4892 TRD0_P TRD0_N _LED1 LED ______________________________________________________________________________________ 13 MAX4890/MAX4891/MAX4892 Typical Operating Circuit
PAGE 14
10/100/1000 Base-T Ethernet LAN Switch MAX4890/MAX4891/MAX4892 Functional Diagrams A0 A1 0B1 1B1 A0 A1 0B1 1B1 0B2 0B2 1B2 1B2 A2 2B1 A2 2B1 A3 3B1 A3 3B1 2B2 2B2 3B2 3B2 A4 4B1 A4 A5 5B1 A5 4B1 5B1 4B2 4B2 5B2 5B2 A6 6B1 A6 6B1 A7 7B1 A7 7B1 6B2 6B2 7B2 7B2 LED0 0LED1 0LED2 SEL MAX4890 SEL MAX4891 14 ______________________________________________________________________________________
PAGE 15
10/100/1000 Base-T Ethernet LAN Switch A0 A1 0B1 1B1 0B2 1B2 A2 2B1 A3 3B1 2B2 3B2 A4 4B1 A5 5B1 4B2 5B2 A6 6B1 A7 7B1 6B2 7B2 LED0 0LED1 0LED2 LED1 1LED1 1LED2 LED2 2LED1 2LED2 SEL MAX4892 ______________________________________________________________________________________ 15 MAX4890/MAX4891/MAX4892 Functional Diagrams (continued)
PAGE 16
10/100/1000 Base-T Ethernet LAN Switch 0LED1 4 21 3B2 0LED2 MAX4891 5 20 4B1 N.C. 6 19 5B1 A4 7 18 4B2 8 13 14 15 16 6B1 GND 12 7B1 11 6B2 10 7B2 9 A7 17 A6 A5 *EP 5B2 16 0B1 1B1 0B2 1B2 29 28 2LED2 32 3 25 3B1 LED0 4 24 2B2 0LED1 5 23 3B2 0LED2 6 22 4B1 A4 7 21 5B1 A5 8 20 4B2 A6 9 19 5B2 MAX4892 *EP TQFN *EP = EXPOSED PAD.
PAGE 17
10/100/1000 Base-T Ethernet LAN Switch REVISION NUMBER REVISION DATE 1 8/05 Removed future product part number 2 8/07 Added exposed pad information DESCRIPTION PAGES CHANGED — 1, 7, 14, 15, 16 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.