Datasheet

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General Description

The MAX4887 triple, high-frequency switch is intended

for notebooks and monitors to permit RGB signals to be

switched from one driver to one of two loads (1:2) or one

of two sources to be connected to one load (2:1). The

MAX4887 high-performance switch utilizes n-channel

architecture with internal high-drive pullup from a low-

noise charge pump, resulting in very low on-capacitance.

The MAX4887 features 5Ω (typ) on-resistance switches

with 10pF on-capacitances for routing RGB video sig-

nals. A logic input enables or disables the internal

charge pump for optimal frequency performances when

operating at lower input voltages resulting in standby

supply current less than 3µA. All RGB inputs/outputs are

ESD protected to ±8kV Human Body Model (HBM) and

feature a global input (EN) that places all inputs and out-

puts in a high-impedance state.

The MAX4887 is available in a small 3mm x 3mm, 16-

pin TQFN package for ease of assembly and

flowthrough layout, resulting in minimum space require-

ment and simplicity in board layout. The MAX4887

operates over the -40°C to +85°C temperature range.

Applications

Notebook Computers

Servers and Routers

Docking Stations

PC/HDTV Monitors

Features

♦ +3V/+5V Single-Supply Operation

♦ Low R

5Ω (V+ = 5V)

♦ Low 10pF (typ) C

♦ Global ENABLE Input to Turn On/Off Switches

♦ Break-Before-Make Switching

♦ ±8kV HBM ESD Protection per IEC1000-4-2 on I/Os

♦ Less than 1mA Supply Current (Charge Pump

Enabled)

♦ Less than 3µA Standby Mode

♦ Charge-Pump Noise Lower than 163µV

P-P

♦ Flowthrough Layout for Easy Board Layout

♦ Space-Saving Lead-Free (3mm x 3mm) 16-Pin

TQFN Package

MAX4887

Triple Video Switch

________________________________________________________________ Maxim Integrated Products 1

19-3972; Rev 0; 2/06

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.

Ordering Information

VGA

D/A

CONVERTER

V+

GND

+3.3V

+5V

SEL

0.1µF

VGA

CONNECTOR 1

DOCKING

STATION

FROM CONTROL

SIGNALS

75Ω

VGA

CONNECTOR 2

MAX4887

Typical Operating Circuit

PART

TEMP

RANGE

PIN-

PACKAGE

TOP

MARK

PKG

CODE

MAX4887ETE

-40°C to

+85°C

16 TQFN-EP*

3mm x 3mm

AEF

T1633-4

*EP = Exposed paddle.

The MAX4887 is available only in a lead-free package. Specify

lead-free by adding the + symbol at the end of the part num-

ber when ordering.

Summary of content (12 pages)

PAGE 1
9-3972; Rev 0; 2/06 Triple Video Switch Features The MAX4887 triple, high-frequency switch is intended for notebooks and monitors to permit RGB signals to be switched from one driver to one of two loads (1:2) or one of two sources to be connected to one load (2:1). The MAX4887 high-performance switch utilizes n-channel architecture with internal high-drive pullup from a lownoise charge pump, resulting in very low on-capacitance.
PAGE 2
MAX4887 Triple Video Switch ABSOLUTE MAXIMUM RATINGS (All voltages referenced to GND.) V+ .............................................................................-0.3V to +6V R_, G_, B_, SEL, QP, EN (Note 1) ................-0.3V to (V+ + 0.3V) Continuous Current through Any Switch ........................±120mA Peak Current through Any Switch (pulsed at 1ms, 10% duty cycle).................................±240mA Continuous Power Dissipation (TA = +70°C) 16-Pin Thin QFN-EP (derate 15.
PAGE 3
Triple Video Switch MAX4887 AC ELECTRICAL CHARACTERISTICS—5V SUPPLY (V+ = +5V, QP = GND, TA = TMIN to TMAX. Typical values are at TA = +25°C, unless otherwise noted.) (Note 2) PARAMETER SYMBOL CONDITIONS MIN Charge-Pump Noise VQP RS = RL = 50Ω Turn-On Time tON VIN = +4.5V, RL = 100Ω, Figure 2 Charge Injection tPLH/tPHL Output Skew Between Ports 3dB Bandwidth tSKEW fMAX Off-Isolation MAX 163 UNITS µVP-P 20 VGEN = 0V, RGEN = 0Ω, CL = 1.
PAGE 4
MAX4887 Triple Video Switch AC ELECTRICAL CHARACTERISTICS—3.3V SUPPLY (V+ = +3.3V, QP = GND, TA = TMIN to TMAX. Typical values are at TA = +25°C, unless otherwise noted.) (Note 2) PARAMETER SYMBOL CONDITIONS Charge-Pump Noise VQP RS = RL = 50Ω Turn-On Time tON VIN = +3V, RL = 100Ω , Figure 2 VGEN = 0V, RGEN = 0Ω, CL = 1.
PAGE 5
Triple Video Switch V+ = 3.3V 4.4 V+ = 3V 4.2 V+ = 3.6V 4.1 TA = +85°C TA = +25°C TA = -40°C 5 4 3 1.2 1.8 2.4 3.0 4.0 0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 VRGB (V) VRGB (V) ON-RESISTANCE vs. V+ ON-RESISTANCE vs. VRGB 7 6 TA = +85°C TA = +25°C TA = -40°C 5 4 3 QP = HIGH 54 V+ = 4.5V 48 ON-RESISTANCE (Ω) 42 ON-RESISTANCE vs. VRGB V+ = 5V 36 V+ = 5.5V 30 40 35 24 18 30 25 20 15 12 1 6 5 0 0 0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 VRGB (V) SUPPLY CURRENT vs.
PAGE 6
Typical Operating Characteristics (continued) (TA = +25°C, unless otherwise noted.) TURN-ON TIMES vs. TEMPERATURE 5.6 ON-LEAKAGE 0.1 0.01 V+ = 3.3V 5.4 5.2 5.0 50 TURN-OFF TIMES (ns) 1 5.8 TURN OFF TIMES (µs) 10 60 MAX4887 toc11 V+ = 3.3V V+ = 5V 4.8 4.6 4.4 OFF-LEAKAGE 0.001 -15 10 35 60 40 30 V+ = 5V 20 10 4.0 85 0 -40 -15 10 35 60 85 -40 -15 10 35 TEMPERATURE (°C) TEMPERATURE (°C) TEMPERATURE (°C) PROPAGATION DELAY vs. TEMPERATURE INSERTION LOSS vs.
PAGE 7
Triple Video Switch PIN NAME FUNCTION 1 V+ Supply Voltage Input. Bypass V+ to GND with a 0.1µF or larger ceramic capacitor. 2 R0 RGB Input/Output 3 G0 RGB Input/Output 4 B0 RGB Input/Output 5 GND 6 EN 7, 14 N.C. Ground Active-Low Enable Input. Drive EN high to disable the MAX4887. All I/Os are high impedance when the device is disabled. Drive EN low for normal operation.
PAGE 8
Triple Video Switch MAX4887 Timing Diagrams/Test Circuits V+ MAX4887 SWITCH OUTPUT V+ SWITCH INPUT RO, GO, BO V IN LOGIC INPUT VOUT R_, G_, B_ RL V+ t r < 5ns t f < 5ns 50% 0V CL t OFF SEL VOUT GND LOGIC INPUT SWITCH OUTPUT CL INCLUDES FIXTURE AND STRAY CAPACITANCE. RL VOUT = VIN RL + RON ( 0.9 x V0UT 0V 0.9 x V0UT t ON LOGIC INPUT WAVEFORMS INVERTED FOR SWITCHES THAT HAVE THE OPPOSITE LOGIC SENSE. ) Figure 2.
PAGE 9
Triple Video Switch 0.1µF R_ +5V VIN 0.5 x VIN SEL V+ 0.5 x VIN VOUT R _,B_,G_ 50Ω TRACE MAX4887 50Ω VIN TRACE 0.5 X VOUT 10pF B_ R_, G_,B_ tPHL1 GND QP tPLH1 R_ EN VIN 0.5 x VIN 0.5 x VIN tPLH2 tPHL2 0.5 X VOUT B_ tSKEW = tPLH1 - tPLH2 OR tPHL1 = tPHL2 Figure 4. Propagation Delay and Skew Measurement Applications Information Power-Supply Bypassing and Sequencing Proper power-supply sequencing is recommended for all CMOS devices.
PAGE 10
MAX4887 Triple Video Switch MAX4887 BANDWIDTH NETWORK ANALYZER 50Ω TRACE CROSSTALK NETWORK ANALYZER 50Ω TRACE (RGB)1,2 50Ω TRACE (RGB)0 NETWORK ANALYZER R1 R0 50Ω TRACE 10% 0 R13 49.9Ω OFF-ISOLATION NETWORK ANALYZER 50Ω TRACE (RGB)0 PEAK-TO-PEAK RINGING (NOT DRAWN TO SCALE) 36.8% G1 G0 Ir AMPERES R13 49.9Ω NETWORK ANALYZER IP 100% 90% (RGB)1,2 50Ω TRACE 0 TIME tRL tDL CURRENT WAVEFORM NETWORK ANALYZER R15 49.9Ω Figure 7. HBM Discharge Current Waveform Figure 5.
PAGE 11
Triple Video Switch Chip Information PROCESS: BiCMOS G2 B2 B1 G1 TOP VIEW 12 11 10 9 R2 13 N.C. 14 8 R1 7 N.C. 6 EN 5 GND MAX4887 SEL 15 1 2 3 4 G0 B0 + R0 *EP 16 V+ QP (3mm x 3mm) Thin QFN *EXPOSED PADDLE. CONNECT 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.) (NE - 1) X e E MARKING 12x16L QFN THIN.EPS MAX4887 Triple Video Switch E/2 D2/2 (ND - 1) X e AAAA D/2 e CL D D2 k CL b 0.10 M C A B E2/2 L E2 0.10 C CL 0.08 C CL A A2 A1 L L e e PACKAGE OUTLINE 8, 12, 16L THIN QFN, 3x3x0.8mm G 21-0136 PKG 8L 3x3 12L 3x3 16L 3x3 A 0.70 0.75 0.80 0.