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19-2042; Rev 1; 2/03
2.5, Low-Voltage, SPST/SPDT Analog Switches in UCSP Package
General Description
The MAX4686/MAX4687/MAX4688 low on-resistance (RON), low-voltage analog switches operate from a single +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) analog 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 2.5 (max) RON, with 0.4 (max) RON matching and 1 (max) flatness. The MAX4686/MAX4687/MAX4688 offer fast switching speeds (tON = 30ns max, tOFF = 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 (UCSPTM), 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 RON 2.5 max (+3V Supply) 10 max (+1.8V Supply) o 0.4 max RON Match Between Channels o 1 max RON Flatness Over Signal Range o Low Leakage Currents Over Temperature 0.5nA (max) at TA = +25C o Fast Switching: tON = 30ns, tOFF = 12ns o Guaranteed Break-Before-Make (MAX4688) o +1.8V to +5.5V Single-Supply Operation o Rail-to-Rail(R) 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 -40C to +85C -40C to +85C -40C to +85C BUMPPACKAGE 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.
2.5, 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 (TA = +70C) 3 x 2 UCSP (derate 10.1mW/C at +70C) ..................808mW Operating Temperature Range ...........................-40C to +85C Storage Temperature Range ............................-65C to +150C Bump Reflow Temperature .............................................+235C
Note 1: Signals on NO, NC, and COM exceeding V+ are clamped by an internal diode. Limit forward-diode current to maximum current 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 recommended 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, VIH = +1.4V, VIL = 0.5V, TA = TMIN to TMAX, unless otherwise noted. Typical values are at 3V and TA = +25C.) (Notes 3, 4)
PARAMETER ANALOG SWITCH Analog Signal Range VCOM, VNO, VNC RON V+ = 2.7V, VNC = 0 to V+, ICOM = 10mA TMIN to TMAX +25C On-Resistance TMIN to TMAX +25C RON V+ = 2.7V, VNO or VNC = 1.5V, ICOM = 10mA TMIN to TMAX +25C On-Resistance Flatness (Note 6) RFLAT(ON) V+ = 2.7V, VNO or VNC = 0 to V+, ICOM = 10mA TMIN to TMAX +25C NO, NC Off-Leakage Current (Note 7) INO(OFF), INC(OFF) V+ = 3.3V; VCOM = 0.3V or 3V; VNO or VNC = 3V, 0.3V V+ = 3.3V; VCOM = 0.3V or 3V; VNO or VNC = 3V, 0.3V V+ = 3.3V; VCOM = 3V or 0.3V; VNO or VNC = 3V, 0.3V, or floating TMIN to TMAX +25C COM Off-Leakage Current (Note 7) ICOM_(OFF) TMIN to TMAX +25C COM On-Leakage Current (Note 7) ICOM_(ON) TMIN to TMAX +25C Turn-On Time (Note 7) tON VNO or VNC = 1.5V, Figure 2 TMIN to TMAX -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 0.5 1 1 +0.5 1 0.5 1 0.5 1 nA nA nA V SYMBOL CONDITIONS TA MIN TYP MAX UNITS
On-Resistance Match Between Channels (MAX4688 only) (Note 5)
DYNAMIC CHARACTERISTICS 20 30 35 ns
2
_______________________________________________________________________________________
2.5, Low-Voltage, SPST/SPDT Analog Switches in UCSP Package
ELECTRICAL CHARACTERISTICS (continued)
(V+ = +2.7V to +3.3V, VIH = +1.4V, VIL = 0.5V, TA = TMIN to TMAX, unless otherwise noted. Typical values are at 3V and TA = +25C.) (Notes 3, 4)
PARAMETER Turn-Off Time (Note 7) SYMBOL tOFF CONDITIONS VNO or VNC = 1.5V, Figure 2 TA +25C TMIN to TMAX +25C 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 OffCapacitance 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, VIN = 0 or V+ TMIN to TMAX TMIN to TMAX 1.8 -1 5.5 1 V A VIH VIL IIH, IIL VIN = 0 or V+ TMIN to TMAX TMIN to TMAX TMIN to TMAX -1 1.4 0.5 1 V V A tBBM VNO, VNC = 1.5V, Figure 3 VGEN = 0, RGEN = 0, CL = 1.0nF, Figure 4 Signal = 0dBm, 50 in and out, Figure 5 CL = 5pF, RL = 50, f = 100kHz, Figure 5 CL = 5pF, RL = 50, f = 100kHz, Figure 5 RL = 600, 2Vp-p, f = 20Hz to 20kHz f = 1MHz, Figure 6 f = 1MHz, Figure 6 f = 1MHz, Figure 6 TMIN to TMAX +25C +25C +25C +25C +25C +25C +25C +25C 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 VISO VCR THD CNO(OFF), CNC(OFF) CCOM(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 +25C only and guaranteed by correlation at the full hot-rated temperature. Note 5: RON = RON(MAX) - RON(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 = 20log10 (VCOM / VNO), VCOM = output, VNO = input to off switch. Note 9: Between switches. _______________________________________________________________________________________ 3
2.5, Low-Voltage, SPST/SPDT Analog Switches in UCSP Package MAX4686/MAX4687/MAX4688
Typical Operating Characteristics
(TA = +25C, unless otherwise noted.)
SUPPLY CURRENT vs. SUPPLY VOLTAGE
MAX4686/7/8 toc01
ON-RESISTANCE vs. VCOM
MAX4686/7/8 toc02
ON-RESISTANCE vs. VCOM (V+ = +3V)
MAX4686/7/8 toc03
12 10 SUPPLY CURRENT (pA) 8
4.0 3.5 3.0 RON () 2.5 2.0 1.5 V+ = +5V 1.0 V+ = +2.7V V+ = +3.3V V+ = +1.8V
3.0 TA = +85C
2.5
6 4 2 0 0 1 2 3 4 5 6 SUPPLY VOLTAGE (V)
RON ()
2.0
TA = +25C
1.5 TA = -40C
1.0
0.5 0 1 2 3 4 5 0 0.5 1.0 1.5 VCOM (V) 2.0 2.5 3.0 VCOM (V)
ON-RESISTANCE vs. VCOM (V+ = +5V)
2.3 2.1 1.9 RON () 1.7 1.5 1.3 1.1 0.9 0.7 0.5 0 1 2 3 4 5 VCOM (V) 0 1.5 TA = -40C TA = +85C TA = +25C
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) VIN RISING 1.5
35 30 25 tON/OFF (ns) 20 15 10 5 0 tOFF tON
1.0
VIN 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. VCOM
V+ = +5V 60 Q (pC)
MAX4686/7/8 toc09
18 15 12 tON/OFF (ns) 9 6 3 0
1000 ON/OFF-LEAKAGE CURRENT (pA)
V+ = +3V
V+ = +3V
80
100
ICOMON
tON tOFF
10
40
V+ = +3V
1
INOOFF, INCOFF
20
0.1 -40 -15 10 35 60 85 -40 -15 10 35 60 85 TEMPERATURE (C) TEMPERATURE (C)
0 0 1 2 VCOM (V) 3 4 5
4
_______________________________________________________________________________________
2.5, Low-Voltage, SPST/SPDT Analog Switches in UCSP Package
Typical Operating Characteristics (continued)
(TA = +25C, 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 consumption. Logic inputs accept up to +5.5V regardless of supply voltage.
Analog Signal Levels
Analog signals that range over the entire supply voltage (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
2.5, Low-Voltage, SPST/SPDT Analog Switches in UCSP Package MAX4686/MAX4687/MAX4688
Proper power-supply sequencing is recommended for all CMOS devices. Always apply V+ before applying analog signals, especially if the analog signal is not current limited. If this sequencing is not possible, and if the analog inputs are not current limited to <20mA, add a small-signal diode (D1) as shown in Figure 1. Adding a protection diode reduces the analog range to a diode drop (about 0.7V) below V+ (for D1). RON increases slightly at low supply voltages. Maximum supply voltage (V+) must not exceed +6V.Protection diode D1 also protects against some overvoltage situations. No damage will result on Figure 1's circuit if the supply voltage is below the absolute maximum rating and if a fault voltage up to the absolute maximum rating is applied to an analog signal pin.
UCSP Reliability
The chip-scale package (UCSP) represents a unique packaging form factor that may not perform equally to a packaged product through traditional mechanical reliability tests. CSP reliability is integrally linked to the user's assembly methods, circuit board material, and usage environment. The user should closely review these areas when considering use of a CSP package. Performance through Operating Life Test and Moisture Resistance remains uncompromised as it is primarily determined by the wafer-fabrication process. Mechanical stress performance is a greater consideration for a CSP package. CSPs are attached through direct solder contact to the user's PC board, foregoing the inherent stress relief of a packaged product lead frame. Solder joint contact integrity must be considered. Information on Maxim's qualification plan, test data, and recommendations are detailed in the UCSP application note, which can be found on Maxim's website at www.maxim-ic.com.
UCSP Package Consideration
For general UCSP package information and PC layout considerations, please refer to the Maxim Application Note (Wafer-Level Ultra-Chip-Board-Scale Package).
Test Circuits/Timing Diagrams
MAX4686 MAX4687 MAX4688
VIN_ NO_ OR NC V+ V+ COM_ RL 50 IN_ LOGIC INPUT GND SWITCH OUTPUT 0 t ON LOGIC INPUT VOUT CL 35pF VOUT 0.9 x V0UT t OFF 0.9 x VOUT V+ 50% 0 t r < 5ns t f < 5ns
VOUT = VN_
CL INCLUDES FIXTURE AND STRAY CAPACITANCE. RL RL + RON
(
)
LOGIC INPUT WAVEFORMS INVERTED FOR SWITCHES THAT HAVE THE OPPOSITE LOGIC SENSE.
Figure 2. Switching Time
MAX4688
V+ V+ VN_ NC_ NO_ IN_ LOGIC INPUT GND VOUT tD CL INCLUDES FIXTURE AND STRAY CAPACITANCE. 0.9 x VOUT COM_ RL 300 VOUT CL 35pF LOGIC INPUT
V+ 50% 0 tr < 5ns tf < 5ns
Figure 3. Break-Before-Make Interval (MAX4688 only) 6 _______________________________________________________________________________________
2.5, Low-Voltage, SPST/SPDT Analog Switches in UCSP Package MAX4686/MAX4687/MAX4688
Test Circuits/Timing Diagrams (continued)
V+ VOUT VOUT VOUT CL GND IN_ OFF ON Q = (V OUT )(C L ) IN DEPENDS ON SWITCH CONFIGURATION; INPUT POLARITY DETERMINED BY SENSE OF SWITCH. OFF IN OFF ON OFF
MAX4686 MAX4687 MAX4688
V+ RGEN NC_ OR NO_ COM_
V GEN
VIL TO VIH
IN
Figure 4. Charge Injection
+5V 10nF NETWORK ANALYZER 0V OR V+ IN_ V+ COM VIN 50 50
V OFF-ISOLATION = 20log OUT VIN V ON-LOSS = 20log OUT VIN CROSSTALK = 20log VOUT VIN
NC_ 50
MAX4686 MAX4687 MAX4688
GND
NO
VOUT
MEAS
REF
50
50
MEASUREMENTS ARE STANDARDIZED AGAINST SHORTS AT IC TERMINALS. OFF-ISOLATION IS MEASURED BETWEEN COM_ AND "OFF" NO_ OR NC_ TERMINAL ON EACH SWITCH. ON-LOSS IS MEASURED BETWEEN COM_ AND "ON" NO_ OR NC_ TERMINAL ON EACH SWITCH. CROSSTALK IS MEASURED FROM ONE CHANNEL TO ALL OTHER CHANNELS. SIGNAL DIRECTION THROUGH SWITCH IS REVERSED; WORST VALUES ARE RECORDED.
Figure 5. Off-Isolation/On-Channel Bandwidth, Crosstalk
10nF
V+
Chip Information
TRANSISTOR COUNT: 150
V+ COM_
MAX4686 MAX4687 MAX4688
IN
CAPACITANCE METER f = 1MHz
NC_ or NO_ GND
VIL OR VIH
Figure 6. Channel Off/On-Capacitance _______________________________________________________________________________________ 7
2.5, Low-Voltage, SPST/SPDT Analog Switches in UCSP Package MAX4686/MAX4687/MAX4688
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.
6L, UCSP.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.
8 _____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 (c) 2003 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.

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