MAXIM MAX4887 User Manual
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 lownoise charge pump, resulting in very low on-capacitance.
The MAX4887 features 5Ω (typ) on-resistance switches
with 10pF on-capacitances for routing RGB video signals. 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 outputs in a high-impedance state.
The MAX4887 is available in a small 3mm x 3mm, 16pin TQFN package for ease of assembly and
flowthrough layout, resulting in minimum space requirement 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
ON
5Ω (V+ = 5V)
♦ Low 10pF (typ) C
ON
♦ 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
CC
V+
GND
+3.3V
+5V
EN
SEL
R0
G0
B0
0.1µF
VGA
CONNECTOR 1
DOCKING
STATION
R2
G2
B2
R1
G1
B1
QP
FROM CONTROL
SIGNALS
75Ω 75Ω
75Ω
VGA
CONNECTOR 2
MAX4887
Typical Operating Circuit
PART
TEMP
PINPACKAGE
TOP
PKG
CODE
MAX4887ETE
-40°C to
+85°C
16 TQFN-EP*
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 number when ordering.
RANGE
3mm x 3mm
MARK
AEF
MAX4887
Triple Video Switch
2 _______________________________________________________________________________________
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.
(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 (T
A
= +70°C)
16-Pin Thin QFN-EP (derate 15.6mW/°C above
+70°C).........................................................................1250mW
Operating Temperature Range ...........................-40°C to +85°C
Storage Temperature Range .............................-65°C to +150°C
Junction Temperature......................................................+150°C
Lead Temperature (soldering, 10s) .................................+300°C
DC ELECTRICAL CHARACTERISTICS—5V SUPPLY
(V+ = 5V, QP = GND, TA= T
MIN
to T
MAX
. Typical values are at TA= +25°C, unless otherwise noted.) (Note 2)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
Power-Supply Voltage Range 4.5 5.5 V
QP = GND 0.5 1 mA
Quiescent Supply Current I
+
V+ = +5.5V
QP = V+ 1 3 µA
RGB SWITCHES
QP = GND 5 6.5
On-Resistance R
ON
VIN = +1.5V,
I
IN
= -25mA
QP = V+ 6 7.5
Ω
QP = GND 0.5 1.3
On-Resistance Matching ∆R
ON
0.3V < VIN < +2V,
I
IN
= -25mA (Note 3)
QP = V+ 0.7 1.5
Ω
QP = GND 0.5 1
0 < VIN < +2V,
I
IN
= -25mA
QP = V+ 0.7 1.8
On-Resistance Flatness
)
0 < VIN < +1.5V, IIN =
-25mA
QP =V+ 0.7
Ω
On-Leakage Current I
L(ON)
R_, G_, B_ = 0.7V, 4.8V; EN = GND -1 +1 µA
Off-Leakage Current I
L(OFF)
R_, G_, B_ = 0.7V, 4.8V; EN = GND
pA
LOGIC INPUTS (SEL, EN, QP)
V+ = 4.5V 0.8
Input Low Voltage V
IL
V+ = 5.5V 0.8
V
V+ = 4.5V 2.0
Input High Voltage V
IH
V+ = 5.5V 2.0
V
Input Leakage Current I
LEAK
-1 +1 µA
ESD PROTECTION
Human Body Model, R_, G_, B_ ±8
ESD Protection
Human Body Model, SEL, EN, QP ±2
kV
Note 1: Signals exceeding V+ or GND are clamped by internal diodes. Limit forward-diode current to maximum current rating.
R
FLAT(ON
300
1.55
MAX4887
Triple Video Switch
_______________________________________________________________________________________ 3
AC ELECTRICAL CHARACTERISTICS—5V SUPPLY
(V+ = +5V, QP = GND, TA= T
MIN
to T
MAX
. Typical values are at TA= +25°C, unless otherwise noted.) (Note 2)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
Charge-Pump Noise V
QP
RS = RL = 50Ω
µV
P-P
Turn-On Time t
ON
VIN = +4.5V, RL = 100Ω, Figure 2 20 µs
Charge Injection
28 pC
Propagation Delay
ps
Output Skew Between Ports t
SKEW
Skew between any two ports: R, G, B;
Figure 4 (Note 3)
ps
3dB Bandwidth f
MAX
RS = RL = 50Ω, Figure 6
MHz
Off-Isolation
R
S
= RL = 50Ω, VIN_ = 1V
P-P,
f = 50MHz,
Figure 5
-58 dB
0.5
Insertion Loss I
LOS
1MHz < f < 50MHz,
R
S
= RL = 50Ω
QP = V+ 0.5
dB
Crosstalk V
CT
f < 50MHz, VIN = 1V
P-P
, RS = RL = 50Ω,
Figure 5
-40 dB
Off-Capacitance C
OFF
f = 1MHz, (R,G,B)0 to (R,G,B)
1,2
6pF
On-Capacitance C
ON
f = 1MHz 10 pF
ELECTRICAL CHARACTERISTICS—3.3V SUPPLY
(V+ = +3.3V, QP = GND, TA= T
MIN
to T
MAX
. Typical values are at TA= +25°C, unless otherwise noted.) (Note 2)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
Power-Supply Voltage Range 3.0 3.6 V
Quiescent Supply Current I
+
V+ = +3.6V 0.5 1 mA
RGB SWITCHES
On-Resistance R
ON
V = +3V, VIN = +1.5V, IIN = -25mA 6 7 Ω
On-Resistance Matching ∆R
ON
0 < VIN < +2V, IIN = -25mA (Note 3) 0.8 1.2 Ω
On-Resistance Flatness
)
0< VIN < +2V, IIN = -25mA 0.9 1.4 Ω
On-Leakage Current I
L(ON)
R_, G_, B_ = 0V or +3.6V, EN = GND -1 +1 µA
Off-Leakage Current I
L(OFF)
R_, G_, B_ = 0V or +3.6V, EN = V+
pA
LOGIC INPUTS (SEL, EN, QP)
V+ = 3.0V 0.8
Input Low Voltage V
IL
V+ = 3.6V 0.8
V
V+ = 3.0V 2.0
Input High Voltage V
IH
V+ = 3.6V 2.0
V
Input Leakage Current I
LEAK
-1 +1 µA
ESD PROTECTION
Human Body Model, R_, G_, B_ ±8
ESD Protection
Human Body Model, SEL, EN, QP ±2
kV
V
t
PLH/tPHLC L
= 0V , R
GE N
= 10p F, RS = RL = 50Ω , Fi g ur e 4 (Note 3) 400
= 0Ω , C L = 1.0nF, Fi g ur e 3
GE N
163
350
500
QP = GND
R
FLAT(ON
200
MAX4887
Triple Video Switch
4 _______________________________________________________________________________________
AC ELECTRICAL CHARACTERISTICS—3.3V SUPPLY
(V+ = +3.3V, QP = GND, TA= T
MIN
to T
MAX
. Typical values are at TA= +25°C, unless otherwise noted.) (Note 2)
PARAMETER
CONDITIONS
UNITS
Charge-Pump Noise V
QP
RS = RL = 50Ω 100
µV
P-P
Turn-On Time t
ON
VIN = +3V, RL = 100Ω , Figure 2 25 µs
Charge Injection
V
GEN
= 0V, R
GEN
= 0Ω, CL = 1.0nF,
Figure 3
21 pC
Propagation Delay
C L = 10p F, RS = RL = 50Ω , Fi g ur e 4 ( N ote 3)
ps
Output Skew Between Ports t
SKEW
Skew between any two ports: R, G, B,
Figure 5 (Note 3)
ps
3dB Bandwidth f
MAX
RS = RL = 50Ω, Figure 5 500
MHz
Insertion Loss I
LOS
1MHz < f < 50MHz, RS = RL = 50Ω 0.6 dB
Crosstalk V
CT
f < 50MHz, RS = RL = 50Ω, Figure 5 -40 dB
Off-Isolation
R
S
= RL = 50Ω, VIN_ = 1V
P-P
, f = 50MHz,
Figure 5
-55 dB
Off-Capacitance C
OFF
f = 1MHz, (R,G,B)0 to (R,G,B)
1,2
6pF
On-Capacitance C
ON
f = 1MHz 10 pF
Note 2: Maximum and minimum limits over temperature are guaranteed by design and characterization. Device is production tested
at T
A
= +85°C.
Note 3: Guaranteed by design.
SYMBOL
MIN TYP MAX
t
PHL/tPLH
400
350
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