Datasheet

ManualsBrandsMAXIM INTEGRATED ManualsInterface ICsInterface IC - analogue switches TQFN 32 EP

General Description

The MAX4890E/MAX4892E meet the needs of high-speed

differential switching. The devices handle the needs of

Gigabit Ethernet (10/100/1000) Base-T switching as

well as LVDS and LVPECL switching. The MAX4890E/

MAX4892E provide enhanced ESD protection up to

±15kV, and excellent high-frequency response, making

the devices especially useful for interfaces that must go to

an outside connection.

Both devices provide extremely low capacitance

), as well as low resistance (R

), for low-insertion

loss and very wide bandwidth. In addition to the four

pairs of DPDT switches, the MAX4892E provides LED

switching for laptop computer/docking station use.

The MAX4890E/MAX4892E are pin-for-pin equivalents

to the MAX4890/MAX4892 and can replace these

devices for those applications requiring the enhanced

ESD protection. Both devices are available in space-

saving TQFN packages and operate over the standard

-40°C to +85°C temperature range.

Applications

Notebooks 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

Features

♦ ±15kV ESD Protected Per MIL-STD-883, Method

3015

♦ Single +3.0V to +3.6V Power-Supply Voltage

♦ Low On-Resistance (R

): 4Ω (typ), 6.5Ω (max)

♦ Ultra-Low On-Capacitance (C

): 8pF (typ)

♦ -23dB Return Loss (100MHz)

♦ -3dB Bandwidth: 650MHz

♦ Optimized Pin Out for Easy Transformer and PHY

Interface

♦ Built-In LED Switches for Switching Indicators to

Docking Station (MAX4892E)

♦ Low 450µA (max) Quiescent Current

♦ Bidirectional 8 to 16 Multiplexer/Demultiplexer

♦ Standard Pin Out, Matching the MAX4890 and

MAX4892

♦ Space-Saving Lead-Free Packages

32-Pin, 5mm x 5mm, TQFN Package

36-Pin, 6mm x 6mm, TQFN Package

MAX4890E/MAX4892E

1000 Base-T, ±15kV ESD Protection LAN Switches

________________________________________________________________ Maxim Integrated Products 1

Ordering Information

19-0624; Rev 0; 8/06

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

PKG

CODE

MAX4890EETJ+

32 TQFN-EP*

—

T-3255-4

MAX4892EETX+

36 TQFN-EP*

T-3666-3

+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.

Eye Diagram

CH2: 4B2, 100mV/div

CH1: 5B2, 100mV/div

f = 125MHz

Pin Configurations

SEL

2B1

2B2

3B2

4B2

5B2

4B1

5B1

3B1

LED0

0LED1

1LED2

7B2

6B2

6B1

1LED1

LED1

GND

MAX4892E

TOP VIEW

0LED2

7B1

0B2

V+

LED2

2LED1

2LED2

0B1

1B1

1B2

TQFN

*EP

*EXPOSED PAD CONNECTED TO GND.

Pin Configurations continued at end of data sheet.

Summary of content (13 pages)

PAGE 1
9-0624; Rev 0; 8/06 1000 Base-T, ±15kV ESD Protection LAN Switches The MAX4890E/MAX4892E meet the needs of high-speed differential switching. The devices handle the needs of Gigabit Ethernet (10/100/1000) Base-T switching as well as LVDS and LVPECL switching. The MAX4890E/ MAX4892E provide enhanced ESD protection up to ±15kV, and excellent high-frequency response, making the devices especially useful for interfaces that must go to an outside connection.
PAGE 2
MAX4890E/MAX4892E 1000 Base-T, ±15kV ESD Protection LAN Switches ABSOLUTE MAXIMUM RATINGS V+ ……………………………………………………… -0.3V to +4V All Other Pins………………………………….. -0.3V to (V+ + 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................................................
PAGE 3
1000 Base-T ±15kV ESD Protection LAN Switch MAX4890E/MAX4892E ELECTRICAL CHARACTERISTICS (continued) (V+ = +3V to +3.6V, TA = TJ = 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.) LED_ON-RESISTANCE vs. VLED_ 5 22 TA = +85°C 20 LEAKAGE CURRENT vs. TEMPERATURE 40 MAX4890E toc02 MAX4890E toc01 24 36 32 RONLED (Ω) TA = +85°C 3 TA = -40°C 14 12 2 10 8 1 6 4 TA = +25°C LEAKAGE CURRENT (pA) 18 16 4 TA = +25°C TA = -40°C 0.5 1.0 1.5 2.0 2.5 3.0 0.5 1.0 1.5 2.0 2.5 16 12 ILA_(OFF) -40 3.
PAGE 5
1000 Base-T ±15kV ESD Protection LAN Switch PIN NAME FUNCTION MAX4892E MAX4890E 1 32 A1 Differential PHY Interface Pair. Connect to the Ethernet PHY. 2 1 A2 Differential PHY Interface Pair. Connect to the Ethernet PHY. 3 2 A3 Differential PHY Interface Pair. Connect to the Ethernet PHY. 4 — LED0 LED0 Input 5 — 0LED1 0LED1 Output. Drive SEL low (SEL = 0) to connect LED0 to 0LED1. 6 — 0LED2 7 7 A4 Differential PHY Interface Pair. Connect to the Ethernet PHY.
PAGE 6
MAX4890E/MAX4892E 1000 Base-T, ±15kV ESD Protection LAN Switches MAX4892E 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 1.
PAGE 7
1000 Base-T, ±15kV ESD Protection LAN Switches SEL CONNECTION 0 A_ to _B1, LED_ to _LED1 1 A_ to _B2, LED_ to _LED2 Digital Control Inputs The MAX4890E/MAX4892E provide a single digital control SEL. SEL controls the switches as well as the LED switches as shown in Table 1. Analog Signal Levels The on-resistance of the MAX4890E/MAX4892E is very low and stable as the analog input signals are swept from ground to V+ (see the Typical Operating Characteristics).
PAGE 8
MAX4890E/MAX4892E 1000 Base-T, ±15kV ESD Protection LAN Switches SEL VIH 3.0V 50% 50% 2.0V VIL A_ 1.0V _B1 tON 50% tPHL tPLH 50% tOFF VH 0V 2.0V tON tOFF _B2 50% _B_ VL 50% PULSE SKEW = tSK(p) = |tPHL - tPLH| THE MAX4890E/MAX4892E SWITCHES ARE FULLY BIDIRECTIONAL. 0V Figure 2. Turn-On and Turn-Off Times Figure 3. Propagation Delay Times 3.0V 2.0V A_ 1.0V tPLHX RC 1MΩ tPHLX CHARGE-CURRENT LIMIT RESISTOR VOH 2.
PAGE 9
1000 Base-T, ±15kV ESD Protection LAN Switches DOCKING STATION TRANSFORMER RJ-45 LED CONNECTOR NOTEBOOK 0B2 1B2 2B2 3B2 TRD0_P TRD0_N A0 A1 TRD1_P TRD1_N A2 A3 TRD2_P TRD2_N A4 A5 TRD3_P TRD3_N A6 A7 ETHERNET PHY/MAC 6B2 7B2 _LED2 MAX4892E 0B1 1B1 2B1 3B1 4B1 5B1 RJ-45 6B1 7B1 LED_ SEL SEL_DOCK TRANSFORMER LED_OUT 4B2 5B2 _LED1 LED _______________________________________________________________________________________ 9 MAX4890E/MAX4892E Typical Operating Circuit
PAGE 10
00 Base-T, ±15kV ESD Protection LAN Switches MAX4890E/MAX4892E 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 4B1 A5 5B1 A5 5B1 4B2 4B2 5B2 5B2 A6 6B1 A6 6B1 A7 7B1 A7 7B1 6B2 6B2 7B2 7B2 LED0 0LED1 0LED2 LED1 1LED1 1LED2 LED2 2LED1 2LED2 SEL MAX4890E SEL MAX4892E 10 ______________________________________________________________________________________
PAGE 11
1000 Base-T, ±15kV ESD Protection LAN Switches MAX4890E/MAX4892E Pin Configurations (continued) A0 V+ SEL 0B1 1B1 0B2 1B2 + A1 TOP VIEW 32 31 30 29 28 27 26 25 A2 1 24 2B1 A3 2 23 3B1 N.C. 3 22 2B2 N.C. 4 21 3B2 20 4B1 19 5B1 18 4B2 17 5B2 9 10 11 12 13 14 15 16 6B1 8 7B1 A5 *EP 6B2 7 7B2 A4 N.C. 6 GND N.C. A7 5 A6 N.C. MAX4890E TQFN *EXPOSED PADDLE CONNECTED TO GND.
PAGE 12
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.) QFN THIN.
PAGE 13
1000 Base-T, ±15kV ESD Protection LAN Switches QFN THIN.EPS 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.