19-2042; Rev 1; 2/03
2.5Ω, Low-Voltage, SPST/SPDT
Analog Switches in UCSP Package
General Description
The MAX4686/MAX4687/MAX4688 low on-resistance
(R
ON
), low-voltage analog switches operate from a sin-
gle +1.8V to +5.5V supply. The MAX4686/MAX4687 are
single-pole/single-throw (SPST) analog switches, and
the MAX4688 is a single-pole/double-throw (SPDT) ana-
log switch. The MAX4686 is a normally open (NO)
switch, and the MAX4687 is a normally closed (NC)
switch. The MAX4688 has one normally open (NO)
switch and one normally closed (NC) switch.
When powered from a 3V supply these devices feature
2.5Ω (max) R
ON
, with 0.4Ω (max) R
ON
matching and 1Ω
(max) flatness. The MAX4686/MAX4687/MAX4688 offer
fast switching speeds (t
ON
= 30ns max, t
OFF
= 12ns
max). The MAX4688 offers break-before-make action.
The digital logic inputs are 1.8V logic compatible from a
+2.7V to +3.3V supply. The MAX4686/MAX4687/
MAX4688 are available in the chip-scale package
(UCSP™), significantly reducing the required PC board
area. The chip occupies only a 1.50mm x 1.02mm area.
The 3 x 2 array of solder bumps are spaced with a
0.5mm bump pitch.
o
6-Bump, 0.5mm Pitch, UCSP
o
R
ON
2.5Ω max (+3V Supply)
10Ω max (+1.8V Supply)
o
0.4Ω max R
ON
Match Between Channels
o
1Ω max R
ON
Flatness Over Signal Range
o
Low Leakage Currents Over Temperature
0.5nA (max) at T
A
= +25°C
o
Fast Switching: t
ON
= 30ns, t
OFF
= 12ns
o
Guaranteed Break-Before-Make (MAX4688)
o
+1.8V to +5.5V Single-Supply Operation
o
Rail-to-Rail
®
Signal Handling
o
Low Crosstalk: -95dB (100kHz)
o
High Off-Isolation: -90dB (100kHz)
o
1.8V Logic Compatible
Features
MAX4686/MAX4687/MAX4688
________________________Applications
MP3 Players
Cellular Phones
Power Routing
Battery-Operated Equipment
Relay Replacement
Audio and Video Signal Routing
Communications Circuits
PCMCIA Cards
Cellular Phones
Hard Drives
Ordering Information
PART
MAX4686EBT-T
MAX4687EBT-T
MAX4688EBT-T
TEMP
RANGE
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
BUMP-
PACKAGE
6 UCSP-6
6 UCSP-6
6 UCSP-6
TOP
MARK
AAI
AAJ
AAK
Pin Configurations/Functional Diagrams/Truth Table
TOP VIEW
V+
B1
A1
NO
V+
B1
A1
NC
V+
B1
A1
NO
SWITCHES SHOWN FOR LOGIC "0"
IN
B2
A2
I.C.
IN
B2
A2
I.C.
IN
B2
A2
COM
MAX4686/MAX4687/MAX4688
IN
NO
OFF
ON
NC
ON
OFF
GND
B3
A3
COM
GND
B3
A3
COM
GND
B3
A3
NC
0
1
MAX4686
SPST NO
MAX4687
SPST NC
MAX4688
SPDT
Rail-to-Rail is a registered trademark of Nippon Motorola, Ltd.
UCSP is a trademark of Maxim Integrated Products, Inc.
________________________________________________________________
Maxim Integrated Products
1
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.
2.5Ω, Low-Voltage, SPST/SPDT
Analog Switches in UCSP Package
MAX4686/MAX4687/MAX4688
ABSOLUTE MAXIMUM RATINGS
All Voltages Referenced to GND
V+, IN .......................................................................-0.3V to +6V
COM, NO, NC (Note1)..................................-0.3V to (V+ + 0.3V)
Continuous Current NO, NC, COM ................................±100mA
Peak Current NO, NC, COM
(pulsed at 1ms, 10% duty cycle) ...............................±200mA
Continuous Power Dissipation (T
A
= +70°C)
3 x 2 UCSP (derate 10.1mW/°C at +70°C) ..................808mW
Operating Temperature Range ...........................-40°C to +85°C
Storage Temperature Range ............................-65°C to +150°C
Bump Reflow Temperature .............................................+235°C
Note 1:
Signals on NO, NC, and COM exceeding V+ are clamped by an internal diode. Limit forward-diode current to maximum cur-
rent rating.
Note 2:
This device is constructed using a unique set of packaging techniques that impose a limit on the thermal profile the device
can be exposed to during board level solder attach and rework. This limit permits only the use of the solder profiles recom-
mended in the industry standard specification, JEDEC 020A, paragraph 7.6, Table 3 for IR/VPR and convection reflow.
Preheating is requied. Hand or wave soldering is not allowed.
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.
ELECTRICAL CHARACTERISTICS
(V+ = +2.7V to +3.3V, V
IH
= +1.4V, V
IL
= 0.5V, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at 3V and T
A
= +25°C.)
(Notes 3, 4)
PARAMETER
ANALOG SWITCH
Analog Signal Range
V
COM
, V
NO
,
V
NC
R
ON
V+ = 2.7V, V
NC
= 0 to V+,
I
COM
= 10mA
T
MIN
to
T
MAX
+25°C
On-Resistance
T
MIN
to
T
MAX
+25°C
∆R
ON
V+ = 2.7V, V
NO
or V
NC
= 1.5V,
I
COM
= 10mA
T
MIN
to
T
MAX
+25°C
On-Resistance Flatness
(Note 6)
R
FLAT(ON)
V+ = 2.7V, V
NO
or V
NC
= 0 to V+,
I
COM
= 10mA
T
MIN
to
T
MAX
+25°C
NO, NC Off-Leakage
Current (Note 7)
I
NO(OFF)
,
I
NC(OFF)
V+ = 3.3V; V
COM
= 0.3V or 3V;
V
NO
or V
NC
= 3V, 0.3V
V+ = 3.3V; V
COM
= 0.3V or 3V;
V
NO
or V
NC
= 3V, 0.3V
V+ = 3.3V; V
COM
= 3V or 0.3V;
V
NO
or V
NC
= 3V, 0.3V, or floating
T
MIN
to
T
MAX
+25°C
COM Off-Leakage
Current (Note 7)
I
COM_(OFF)
T
MIN
to
T
MAX
+25°C
COM On-Leakage
Current (Note 7)
I
COM_(ON)
T
MIN
to
T
MAX
+25°C
Turn-On Time (Note 7)
t
ON
V
NO
or V
NC
= 1.5V, Figure 2
T
MIN
to
T
MAX
-0.5
-1
-0.5
-1
-0.5
-1
±0.01
±0.01
±0.01
0.5
0.3
0
1.5
V+
2.5
3.5
0.4
Ω
0.5
1
1
+0.5
1
0.5
1
0.5
1
nA
nA
nA
Ω
Ω
V
SYMBOL
CONDITIONS
T
A
MIN
TYP
MAX
UNITS
On-Resistance Match
Between Channels
(MAX4688 only)
(Note 5)
DYNAMIC CHARACTERISTICS
20
30
35
ns
2
_______________________________________________________________________________________
2.5Ω, Low-Voltage, SPST/SPDT
Analog Switches in UCSP Package
ELECTRICAL CHARACTERISTICS (continued)
(V+ = +2.7V to +3.3V, V
IH
= +1.4V, V
IL
= 0.5V, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at 3V and T
A
= +25°C.)
(Notes 3, 4)
PARAMETER
Turn-Off Time (Note 7)
SYMBOL
t
OFF
CONDITIONS
V
NO
or V
NC
= 1.5V, Figure 2
T
A
+25°C
T
MIN
to
T
MAX
+25°C
Break-Before-Make
(MAX4688 only) (Note 7)
Charge Injection
On-Channel -3dB
Bandwidth
Off-Isolation (Note 8)
Crosstalk (MAX4688
only) (Note 9)
Total Harmonic
Distortion
NO, NC Off-
Capacitance
COM Off-Capacitance
Switch On-Capacitance
DIGITAL I/O
Input Logic High
Input Logic Low
Logic Input
Leakage Current
POWER SUPPLY
Power-Supply Range
Supply Current
V+
I+
V+ = 3.3V, V
IN
= 0 or V+
T
MIN
to
T
MAX
T
MIN
to
T
MAX
1.8
-1
5.5
1
V
µA
V
IH
V
IL
I
IH
, I
IL
V
IN
= 0 or V+
T
MIN
to
T
MAX
T
MIN
to
T
MAX
T
MIN
to
T
MAX
-1
1.4
0.5
1
V
V
µA
t
BBM
V
NO
, V
NC
= 1.5V, Figure 3
V
GEN
= 0, R
GEN
= 0,
C
L
= 1.0nF, Figure 4
Signal = 0dBm, 50Ω in and out,
Figure 5
C
L
= 5pF, R
L
= 50Ω, f = 100kHz,
Figure 5
C
L
= 5pF, R
L
= 50Ω, f = 100kHz,
Figure 5
R
L
= 600Ω, 2Vp-p, f = 20Hz to 20kHz
f = 1MHz, Figure 6
f = 1MHz, Figure 6
f = 1MHz, Figure 6
T
MIN
to
T
MAX
+25°C
+25°C
+25°C
+25°C
+25°C
+25°C
+25°C
+25°C
2
40
200
-90
-95
0.06
12
12
35
8
ns
MIN
TYP
10
MAX
12
15
ns
UNITS
MAX4686/MAX4687/MAX4688
Q
BW
V
ISO
V
CR
THD
C
NO(OFF)
,
C
NC(OFF)
C
COM(OFF)
C
(ON)
pC
MHz
dB
dB
%
pF
pF
pF
Note 3:
The algebraic convention, where the most negative value is a minimum and the most positive value a maximum, is used in
this data sheet.
Note 4:
UCSP parts are 100% tested at +25°C only and guaranteed by correlation at the full hot-rated temperature.
Note 5:
∆R
ON
= R
ON(MAX
) - R
ON(MIN)
, between switches.
Note 6:
Flatness is defined as the difference between the maximum and minimum value of on-resistance as measured over the
specified analog signal ranges.
Note 7:
Guaranteed by design.
Note 8:
Off Isolation = 20log
10
(V
COM
/ V
NO
), V
COM
= output, V
NO
= input to off switch.
Note 9:
Between switches.
_______________________________________________________________________________________
3
2.5Ω, Low-Voltage, SPST/SPDT
Analog Switches in UCSP Package
MAX4686/MAX4687/MAX4688
Typical Operating Characteristics
(T
A
= +25°C, unless otherwise noted.)
SUPPLY CURRENT vs. SUPPLY VOLTAGE
MAX4686/7/8 toc01
ON-RESISTANCE vs. V
COM
MAX4686/7/8 toc02
ON-RESISTANCE vs. V
COM
(V+ = +3V)
MAX4686/7/8 toc03
12
10
SUPPLY CURRENT (pA)
8
4.0
3.5
3.0
R
ON
(Ω)
2.5
2.0
1.5
V+ = +5V
1.0
V+ = +2.7V
V+ = +3.3V
V+ = +1.8V
3.0
T
A
= +85°C
2.5
6
4
2
0
0
1
2
3
4
5
6
SUPPLY VOLTAGE (V)
R
ON
(Ω)
2.0
T
A
= +25°C
1.5
T
A
= -40°C
1.0
0.5
0
1
2
3
4
5
0
0.5
1.0
1.5
V
COM
(V)
2.0
2.5
3.0
V
COM
(V)
ON-RESISTANCE vs. V
COM
(V+ = +5V)
2.3
2.1
1.9
R
ON
(Ω)
1.7
1.5
1.3
1.1
0.9
0.7
0.5
0
1
2
3
4
5
V
COM
(V)
0
1.5
T
A
= -40°C
T
A
= +85°C
T
A
= +25°C
MAX4686/7/8 toc04
LOGIC THRESHOLD VOLTAGE
vs. SUPPLY VOLTAGE
MAX4686/7/8 toc05
TURN-ON/OFF TIME vs. SUPPLY VOLTAGE
MAX4686/7/8 toc06
2.5
2.0
LOGIC THRESHOLD VOLTAGE (V)
V
IN
RISING
1.5
35
30
25
t
ON/OFF
(ns)
20
15
10
5
0
t
OFF
t
ON
1.0
V
IN
FALLING
0.5
2.0
2.5
3.0
3.5
V+ (V)
4.0
4.5
5.0
5.5
1
2
3
V+ (V)
4
5
6
TURN-ON/OFF TIME vs. TEMPERATURE
MAX4686/7/8 toc07
ON/OFF-LEAKAGE CURRENT
vs. TEMPERATURE
MAX4686/7/8 toc08
CHARGE INJECTION vs. V
COM
V+ = +5V
60
Q (pC)
MAX4686/7/8 toc09
18
15
12
t
ON/OFF
(ns)
9
6
3
0
1000
ON/OFF-LEAKAGE CURRENT (pA)
V+ = +3V
V+ = +3V
80
100
I
COMON
t
ON
t
OFF
10
40
V+ = +3V
1
I
NOOFF,
I
NCOFF
20
0.1
-40
-15
10
35
60
85
-40
-15
10
35
60
85
TEMPERATURE (°C)
TEMPERATURE (°C)
0
0
1
2
V
COM
(V)
3
4
5
4
_______________________________________________________________________________________
2.5Ω, Low-Voltage, SPST/SPDT
Analog Switches in UCSP Package
Typical Operating Characteristics (continued)
(T
A
= +25°C, unless otherwise noted.)
FREQUENCY RESPONSE
ON-RESPONSE
-20
-40
THD + N (%)
LOSS (dB)
OFF-ISOLATION
-60
-80
-100
-120
0.01
0.1
1
FREQUENCY (MHz)
10
100
CROSSTALK
0.1
MAX4686/7/8 toc10
MAX4686/MAX4687/MAX4688
TOTAL HARMONIC DISTORTION PLUS
NOISE vs. FREQUENCY
MAX4686/7/8 toc11
0
1
0.01
10
100
1k
FREQUENCY (Hz)
10k
100k
Pin Description
BUMP
MAX4686
B1
B2
B3
—
A3
A1
A2
MAX4687
B1
B2
B3
A1
A3
—
A2
MAX4688
B1
B2
B3
A3
A2
A1
—
NAME
V+
IN
GND
NC
COM
NO
I.C.
FUNCTION
Positive Supply Voltage Input
Digital Control Input
Ground
Analog Switch, Normally Closed Terminal
Analog Switch, Common Terminal
Analog Switch, Normally Open Terminal
Internally Connected
Applications Information
POSITIVE SUPPLY
Logic Inputs
D1
V+
MAX4686
MAX4687
MAX4688
NO
Vg
COM
Where the MAX4686/MAX4687/MAX4688 have a +3.3V
supply, IN may be driven low to GND and driven high
to 5.5V. Driving IN rail-to-rail minimizes power con-
sumption. Logic inputs accept up to +5.5V regardless
of supply voltage.
Analog Signal Levels
Analog signals that range over the entire supply volt-
age (V+ to GND) are passed with very little change in
R
ON
(see
Typical Operating Characteristics).
The
switches are bidirectional, so the NO, NC, and COM
pins are both inputs or outputs.
GND
Figure 1. Overvoltage Protection Using External Blocking
Diodes
Power-Supply Sequencing
and Overvoltage Protection
CAUTION: Do not exceed the absolute maximum
ratings because stresses beyond the listed ratings
may cause permanent damage to devices.
_______________________________________________________________________________________
5
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