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19-1782; Rev 1; 3/02
3.5, Single 8:1 and Dual 4:1, Low-Voltage Analog Multiplexers
General Description
The MAX4638/MAX4639 are single 8:1 and dual 4:1 CMOS analog multiplexers/demultiplexers (muxes/ demuxes). Each mux operates from a single +1.8V to +5V supply or dual 2.5V supplies. These devices feature 3.5 on-resistance (RON) when powered with a single +5V supply and have -75dB of off-isolation and -85dB crosstalk from the output to each off channel. The switching times are 18ns tON and 7ns tOFF. They feature a -3dB 85MHz bandwidth and a guaranteed 0.25nA leakage current at +25C. A +1.8V to +5.5V operating range makes the MAX4638/ MAX4639 ideal for battery-powered, portable instruments. All channels guarantee break-before-make switching. These parts feature bidirectional operation and can handle Rail-to-Rail(R) analog signals. All control inputs are TTL/CMOS-logic compatible. Decoding is in standard BCD format, and an enable input is provided to simplify cascading of devices. These devices are available in small 16-pin QFN, TSSOP and SOIC packages, as well as a 20-pin QFN package.
Features
o Guaranteed RON 3.5 (+5V or 2.5V Supplies) 6 (+3V Supply) o Guaranteed 0.4 RON Match Between Channels o Guaranteed 1 RON Flatness Over Signal Range o Guaranteed Low Leakage Currents 0.25nA at +25C o Switching Times: tON = 18ns, tOFF = 7ns o +1.8V to +5.5V Single-Supply Operation 2.5V Dual-Supply Operation o Rail-to-Rail Signal Handling o TTL/CMOS-Logic Compatible o Crosstalk: -80dB (1MHz) o Off-Isolation: -60dB (10MHz)
MAX4638/MAX4639
Applications
Automatic Test Equipment Low-Voltage Data-Acquisition Systems Audio and Video Signal Routing Medical Equipment Battery-Powered Equipment Relay Replacement
PART MAX4638EGE MAX4638EUE MAX4638ESE MAX4638EGP
Ordering Information
TEMP RANGE -40C to +85C -40C to +85C -40C to +85C -40C to +85C PIN-PACKAGE 16 QFN (4 4) 16 TSSOP 16 SO 20 QFN (4 4)
Ordering Information continued at end of data sheet.
Pin Configurations/Functional Diagrams
TOP VIEW
MAX4638
A0 1 EN 2 V- 3 NO1 4 NO2 5 NO3 6 NO4 7 COM 8 LOGIC 16 A1 15 A2 14 GND 13 V+ 12 NO5 11 NO6 10 NO7 9 NO8 A0 1 EN 2 V- 3 NO1A 4 NO2A 5 NO3A 6 NO4A 7 COMA 8
MAX4639
16 A1 15 GND LOGIC 14 V+ 13 NO1B 12 NO2B 11 NO3B 10 NO4B 9 COMB
TSSOP/SO Rail-to-Rail is a Registered Trademark of Nippon Motorola, Ltd.
TSSOP/SO
________________________________________________________________ Maxim Integrated Products
1
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3.5, Single 8:1 and Dual 4:1, Low-Voltage Analog Multiplexers MAX4638/MAX4639
ABSOLUTE MAXIMUM RATINGS
(Voltages Referenced to GND) V+ to V- .................................................................................+6V V+, A_, EN ...............................................................-0.3V to +6V V- ............................................................................+0.3V to -6V NO_, COM_ (Note1) .................................... -0.3V to (V+ + 0.3V) Continuous Current A_, EN ............................................. 30mA Continuous Current NO_, COM_ .................................. 100mA Peak Current (NO_, COM_) (pulsed at 1ms, 10% duty cycle) .............................. 200mA Continuous Power Dissipation (TA = +70C) 16-Pin QFN (derate 18.5mW/C above +70C) ........ 1481mW 16-Pin TSSOP (derate 5.7mW/C above +70C) ........ 457mW 16-Pin SO (derate 8.70mW/C above +70C) ............ 696mW 20-Pin QFN (derate 20mW/C above +70C) .......... 1600mW Operating Temperature Range MAX463_E_ E ............................................... -40C to +85C Junction Temperature ......................................................+150C Storage Temperature Range ........................... -65C to +150C Lead Temperature (soldering, 10s) ............................... +300C
Note 1: Signals on COM_, NO_ exceeding V+ or V- are clamped by internal diodes. A_ and EN are clamped only to V- and can exceed V+ up to their maximum ratings. Limit forward-diode current to maximum current rating.
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--+5V Single Supply
(V+ = +5V 10%, V- = 0, VIH = +2.4V, VIL = +0.8V, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25C.)
PARAMETER ANALOG SWITCH Analog Signal Range On-Resistance On-Resistance Match Between Channels (Notes 3, 8) On-Resistance Flatness (Note 4) NO_ Off-Leakage Current (Note 5) COM_ Off-Leakage Current (Note 5) COM_ On-Leakage Current (Note 5) DIGITAL I/O Input Logic High Input Logic Low Input Leakage Current Digital Input Capacitance DYNAMIC Transition Time (Note 5) tTRANS RL = 100, CL = 35pF, VNO1 = +3V or 0, VNO8 = 0 or +3V, Figure 2 TA = +25C TA = TMIN to TMAX 14 18 ns 20 VIH VIL IIH, IIL CIN VIN_ = 0 or V+ -0.1 0.005 2 2.4 0.8 0.1 V V A pF VCOM_, VNO_ RON RON RFLAT(ON) INO_(OFF) ICOM_(OFF) V+ = +4.5V, ICOM_ = 10mA, TA = +25C VNO_ = +3.5V TA = TMIN to TMAX V+ = +4.5V, ICOM_ = 10mA, TA = +25C VNO_ = +3.5V TA = TMIN to TMAX V+ = +4.5V; ICOM_ = 10mA; TA = +25C VNO_ = +1V, +2V, +3.5V TA = TMIN to TMAX V+ = +5.5V; VCOM _ = +1V, TA = +25C +4.5V; VNO_ = +4.5V, +1V TA = TMIN to TMAX V+ = +5.5V; VCOM_ = +1V, +4.5V; VNO_ = +4.5V, +1V TA = +25C TA = TMIN to TMAX TA = +25C TA = TMIN to TMAX 0 2.5 0.1 0.75 -0.25 -0.35 -0.25 -0.75 -0.25 -0.75 0.01 0.01 0.01 V+ 3.5 4.5 0.4 0.5 1 1.2 0.25 0.35 0.25 0.75 0.25 nA 0.75 V nA nA SYMBOL CONDITIONS MIN TYP (Note 2) MAX UNITS
V+ = +5.5V; VCOM_ = +1V, ICOM_(ON) +4.5V; VNO_ = +1V, +4.5V, or floating
2
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3.5, Single 8:1 and Dual 4:1, Low-Voltage Analog Multiplexers
ELECTRICAL CHARACTERISTICS--+5V Single Supply (continued)
(V+ = +5V 10%, V- = 0, VIH = +2.4V, VIL = +0.8V, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25C.)
PARAMETER Break-Before-Make (Note 5) SYMBOL tBBM CONDITIONS RL = 100, CL = 35pF, VNO_ = +3V, Figure 3 RL = 100, CL = 35pF, VNO1 = +3V, VNO2 to VNO8 = 0, Figure 4 RL = 100, CL = 35pF, VNO1 = +3V, VNO2 to VNO8 = 0, Figure 4 Signal = 0dBm, CL = 5pF, 50 in and out, Figure 6 MAX4638 TA = +25C TA = TMIN to TMAX TA = +25C TA = TMIN to TMAX TA = +25C TA = TMIN to TMAX TA = +25C 50 MHz MAX4639 TA = +25C TA = +25C TA = +25C TA = +25C TA = +25C TA = +25C TA = +25C 85 13 9 40 pF MAX4639 MAX4638 MAX4639 20 54 pF 34 pC pF 5 1 14 18 ns 20 7 ns 8 MIN TYP (Note 2) 8 MAX UNITS ns
MAX4638/MAX4639
Enable Turn-On Time (Note 5)
tON(EN)
Enable Turn-Off Time (Note 5)
tOFF(EN)
On-Channel -3dB Bandwidth
BW
Charge Injection NO_ Off-Capacitance
Q CNO_(OFF)
VGEN = +2.5V, RGEN = 0, CL = 1.0nF, Figure 5 VNO_ = 0V, f = 1MHz, Figure 8 MAX4638
COM_ Off-Capacitance
VCOM_ = 0V, CCOM_(OFF) f = 1MHz, Figure 8 VCOM_ = VNO_ = 0V, f = 1MHz, Figure 8
Switch On-Capacitance
C(ON)
CL = 5pF, RL = 50, f = 1MHz, VNO_ = 1VRMS , Figure 6 Off-Isolation (Note 6) VISO CL = 5pF, RL = 50, f = 10MHz, VNO_ = 1VRMS , Figure 6 CL = 5pF, RL = 50, f = 10MHz, VNO_= 1VRMS , Figure 7 CL = 5pF, RL = 50, f = 1MHz, VNO_ = 1VRMS, Figure 7 RL = 600, RFLAT(ON)/RL V+ = +5.5V, VIN = 0 or V+
TA = +25C
-55 dB
TA = +25C
-75
TA = +25C
-65 dB
Crosstalk (Note 7)
VCT
TA = +25C
-85
Total Harmonic Distortion SUPPLY Positive Supply Current
THD
TA = +25C
0.5
%
I+
0.001
1.0
A
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3.5, Single 8:1 and Dual 4:1, Low-Voltage Analog Multiplexers MAX4638/MAX4639
ELECTRICAL CHARACTERISTICS--+3.0V Single Supply
(V+ = +2.7V to +3.3V, V- = 0, VIH = +2.0V, VIL = +0.4V, TA = TMIN to TMAX, unless otherwise noted. Typical values are at V+ = +3V and TA = +25C.)
PARAMETER ANALOG SWITCH Analog Signal Range On-Resistance On-Resistance Match Between Channels (Notes 3, 8) On-Resistance Flatness (Note 4) VCOM_, VNO_ RON RON ICOM_ = 10mA, VNO_ = +1.7V ICOM_ = 10mA, VNO_ = +1.7V ICOM_ = 10mA; VNO_ = +1.5V, +1.7V, +1.9V V+ = +3.3V; VCOM_ = +1V, +3V; VNO_ = +3V, +1V TA = +25C TA = TMIN to TMAX TA = +25C TA = TMIN to TMAX TA = +25C TA = TMIN to TMAX TA = +25C TA = TMIN to TMAX TA = +25C TA = TMIN to TMAX TA = +25C TA = TMIN to TMAX -0.25 -0.35 -0.25 -0.35 -0.25 -0.35 0.01 0.01 0.01 1 0.25 0 4.5 V+ 6 8 0.6 0.8 2 2.5 0.25 nA 0.35 0.25 nA 0.35 0.25 nA 0.35 V SYMBOL CONDITIONS MIN TYP (Note 2 ) MAX UNITS
RFLAT(ON)
NO_ Off-Leakage Current (Note 5) COM_ Off-Leakage Current (Note 5) COM_ On-Leakage Current (Note 5) DIGITAL I/O Input Logic High Input Logic Low Input Leakage Current Digital Input Capacitance DYNAMIC Transition Time (Note 5) Break-Before-Make (Note 5) Enable Turn-On Time (Note 5) Enable Turn-Off Time (Note 5)
INO_(OFF)
V+ = +3.3V; ICOM_(OFF) VCOM_ = +1V, +3V; VNO_ = +3V, +1V V+ = +3.3V; VCOM_ ICOM_(ON) = +1V, +3V; VNO_ = +1V, +3V, or floating VIH VIL IIH, IIL CIN VIN_ = 0 or V+
2.0 0.4 -0.1 0.005 2 VNO_ = +2V, CL = 35pF, RL = 100, Figure 2 VNO_ = +2V, CL = 35pF, RL = 100, Figure 3 VNO_ = +2V, CL = 35pF, RL = 100, Figure 4 VNO_ = +2V, CL = 35pF, RL = 100, Figure 4 TA = +25C TA = TMIN to TMAX TA = +25C TA = TMIN to TMAX TA = +25C TA = TMIN to TMAX TA = +25C TA = TMIN to TMAX 5 1 15 20 24 9 10 8 16 20 24 0.1
V V A pF
tTRANS tBBM tON(EN) tOFF(EN)
ns ns ns ns
4
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3.5, Single 8:1 and Dual 4:1, Low-Voltage Analog Multiplexers
ELECTRICAL CHARACTERISTICS--+3.0V Single Supply (continued)
(V+ = +2.7V to +3.3V, V- = 0, VIH = +2.0V, VIL = +0.4V, TA = TMIN to TMAX, unless otherwise noted. Typical values are at V+ = +3V and TA = +25C.)
PARAMETER SYMBOL CONDITIONS CL = 5pF, RL = 50, f = 10MHz, VNO_ = +1VRMS , Figure 6 CL = 5pF, RL = 50, f = 1MHz, VNO_ = 1VRMS, Figure 6 CL = 5pF, RL = 50, f = 10MHz, VNO_ = 1VRMS, Figure 7 Crosstalk (Note 7) VCT CL = 5pF, RL = 50, f = 1MHz, VNO_ = 1VRMS, Figure 7 Signal = MAX4638 0dBm, 50 in and out, MAX4639 Figure 6 VNO_ = 0V, f = 1MHz, Figure 8 MAX4638 MAX4639 MIN TYP (Note 2 ) 55 dB TA = +25C -75 MAX UNITS
MAX4638/MAX4639
TA = +25C
Off-Isolation (Note 6)
VISO
TA = +25C
-65 dB
TA = +25C
-85
TA = +25C TA = +25C TA = +25C TA = +25C TA = +25C TA = +25C TA = +25C
50 MHz 85 9 40 pF 20 54 pF 34 pF
On-Channel -3dB Bandwidth
BW
NO_ Off-Capacitance
CNO_(OFF)
COM_ Off-Capacitance
VCOM_ = 0V, CCOM_(OFF) f = 1MHz, Figure 8
Switch On-Capacitance
C(ON)
VCOM = VNO_ MAX4638 = 0V, f = 1MHz, MAX4639 Figure 8 V+ = +3.3V, VIN_ = 0 or V+
SUPPLY Positive Supply Current
I+
0.001
1
A
ELECTRICAL CHARACTERISTICS--2.5V Dual Supplies
(V+ = +2.5 10%, V- = -2.5V 10%, VIH = +2.0V, VIL = +0.4V, TA =TMIN to TMAX, unless otherwise noted. Typical values are at V = 2.5V and TA = +25C.)
PARAMETER ANALOG SWITCH Analog Signal Range On-Resistance On-Resistance Match Between Channels (Notes 3, 8) VCOM_, VNO_ RON RON ICOM_ = 10mA, VNO_ = 1.5V, TA = +25C V+ = +2.25V, V- = -2.25V TA = TMIN to TMAX ICOM_ = 10mA, VNO_ = 1.5V, TA = +25C V+ = +2.25V, V- = -2.25V TA = TMIN to TMAX V2.5 0.2 V+ 3.5 4.5 0.4 0.5 V SYMBOL CONDITIONS MIN TYP (Note 2 ) MAX UNITS
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3.5, Single 8:1 and Dual 4:1, Low-Voltage Analog Multiplexers MAX4638/MAX4639
ELECTRICAL CHARACTERISTICS--2.5V Dual Supplies (continued)
(V+ = +2.5 10%, V- = -2.5V 10%, VIH = +2.0V, VIL = +0.4V, TA = TMIN to TMAX, unless otherwise noted. Typical values are at V = 2.5V and TA = +25C.)
PARAMETER On-Resistance Flatness (Note 4) NO_ Off-Leakage Current (Note 5) COM_ Off-Leakage Current (Note 5) SYMBOL CONDITIONS MIN TYP (Note 2 ) 0.75 0.01 MAX 1 1.2 -0.25 -0.35 -0.25 -0.35 -0.25 -0.35 0.01 0.01 0.25 nA 0.35 0.25 nA 0.35 0.25 nA TA = TMIN to TMAX 0.35 UNITS
I = 10mA; VNO_ = 1.5V, TA = +25C RFLAT(ON) COM_ 0; V+ = +2.25V; V- = -2.25V TA = TMIN to TMAX V+ = +2.75V; V- = -2.75V; INO_ (OFF) VCOM_ = +1V, +2.5V; VNO_ = +2.5V, +1V V+ = +2.75V; V- = -2.75; ICOM_ (OFF) VCOM_ = +1V, +2.5V; VNO_ = +2.5V, +1V V+ = +2.5V; V- = -2.5; VCOM_ = +1V, +2.5V; ICOM_ (ON) VNO_ = +1V, +2.5V, or floating TA = +25C TA = TMIN to TMAX TA = +25C TA = TMIN to TMAX TA = +25C
COM_ On-Leakage Current (Note 5) DIGITAL I/O Input Logic High Input Logic Low Input Leakage Current Digital Input Capacitance DYNAMIC Transition Time (Note 5)
VIH VIL IIH, IIL CIN TA = +25C TA = TMIN to TMAX TA = +25C TA = TMIN to TMAX TA = +25C TA = TMIN to TMAX TA = +25C TA = TMIN to TMAX VIN_ = 0 or V+
2.0 0.4 -0.1 0.005 2 0.1
V V A pF
tTRANS
VNO_ = +1.2V, CL = 35pF, RL = 100, Figure 2 VNO_ = +1.2V, CL = 35pF, RL = 100, Figure 4 VNO_ = +1.2V, CL = 35pF, RL = 100, Figure 4 VNO_ = +1.2V, CL = 35pF, RL = 100, Figure 3
16
20 ns 24
Enable Turn-On Time (Note 5) Enable Turn-Off Time (Note 5)
14
18 ns 20
tON(EN)
5
7 ns 8
tOFF(EN)
8 ns 1
Break-Before-Make (Note 5)
tBBM
Note 2: 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 3: RON = RON(MAX) - RON(MIN). Note 4: Flatness is defined as the difference between the maximum and minimum value of on-resistance as measured over the specified analog signal ranges. Note 5: Guaranteed by design. Note 6: Off-Isolation = 20log10 (VCOM_ / VNO_), VCOM_ = output, VNO_ = input to off switch. Note 7: Between any two switches. Note 8: RON matching specifications for QFN packaged parts are guaranteed by design.
6
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3.5, Single 8:1 and Dual 4:1, Low-Voltage Analog Multiplexers MAX4638/MAX4639
Typical Operating Characteristics
(V+ = +5V, V- = 0, TA = +25C, unless otherwise noted.)
ON-RESISTANCE vs. VCOM AND TEMPERATURE
MAX4638 toc01 MAX4638 toc02
ON-RESISTANCE vs. VCOM
25 V+ = +1.8V 20 4.0 3.5 3.0 RON () R0N ()
ON-RESISTANCE vs. VCOM AND TEMPERATURE
V+ = +3V TA = +85C 4 RON ()
MAX4638 toc03
6 5
V+ = +5V TA = +85C
15
2.5 2.0 1.5 TA = -40C TA = +25C
3 TA = +25C 2 1 0 TA = -40C
10 V+ = +3V 5 V+ = +5V
1.0 0.5
0 0
0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 VCOM (V) 0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 VCOM (V)
0
0.5
1.0
1.5 VCOM (V)
2.0
2.5
3.0
SUPPLY CURRENT vs. SUPPLY VOLTAGE
MAX4638 toc04
CHARGE INJECTION vs. VCOM
MAX4638 toc05
SUPPLY CURRENT vs. TEMPERATURE
MAX4638 toc06
200 180 SUPPLY CURRENT (pA) 160
20 18 16 14 CHARGE (pC) 12 10 8 6 4
V = 2.5V
V+ = +5V
10
140 120 100 80 60 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0 SUPPLY VOLTAGE (V)
SUPPLY CURRENT (nA) -2.5 -0.5 1.5 VCOM (V) 3.5 5.5
1
0.1
0.01
2 0 0.001 -40 -15 10 35 60 85 TEMPERATURE (C)
LOGIC LEVEL THRESHOLD vs. SUPPLY VOLTAGE AND TEMPERATURE
MAX4638 toc07
ENABLE TURN-ON/TURN-OFF TIME vs. SUPPLY VOLTAGE
MAX4638 toc08
ENABLE TURN-ON/TURN-OFF TIME vs. TEMPERATURE
14 12 TIME (ns) tON
MAX4638 toc09
1.8 1.6 LOGIC VOLTAGE (V) 1.4 1.2 1.0 TA = +85C 0.8 TA = -40C
45 40 35 30 TIME (ns) tON
16
10 8 6 tOFF
TA = +25C
25 20 15 10 5 tOFF
4 2 0
0.6 1.8 2.3 2.8 3.3 3.8 4.3 4.8 5.3 SUPPLY VOLTAGE (V)
0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 SUPPLY VOLTAGE (V)
-40
-15
10
35
60
85
TEMPERATURE (C)
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7
3.5, Single 8:1 and Dual 4:1, Low-Voltage Analog Multiplexers MAX4638/MAX4639
Typical Operating Characteristics (continued)
(V+ = +5V, V- = 0, TA = +25C, unless otherwise noted.)
ON/OFF-LEAKAGE CURRENT vs. TEMPERATURE
MAX4638 toc10 MAX4638 toc11
FREQUENCY RESPONSE
1000 100 LEAKAGE CURRENT (pA) 10 1 0.1 0.01 0.001 0.01 0.1 1 10 100 1000 -40 0 -20 RESPONSE (dB) -40 OFF-ISOLATION -60 -80 -100 -120 FREQUENCY (MHz) CROSSTALK ON-RESPONSE MAX4638 ON-RESPONSE MAX4639
TOTAL HARMONIC DISTORTION vs. FREQUENCY
V+ = +2.5V V- = -2.5V 5Vp-p SIGNAL 600 IN AND OUT
MAX4638 toc12
0.10
0.08
ON-LEAKAGE OFF-LEAKAGE THD (%) 0.06
0.04
0.02
0 -20 0 20 40 60 80 0.01 0.1 1 FREQUENCY (kHz) 10 100 TEMPERATURE (C)
Pin Description
PIN MAX4638 QFN DIP/SO 16-PIN 1, 15, 16 -- 2 3 4-7 -- 8 -- 9-12 -- 13 14 -- 15, 14, 13 -- 16 1 2-5 -- 6 -- 7-10 -- 11 12 -- 20-PIN 19, 18, 17 -- 1 2 3-6 -- 7 -- 10-13 -- 14 15 8, 9, 16, 20 -- 1, 16 2 3 -- 4-7 -- 8, 9 -- 10-13 14 15 -- DIP/SO 16-PIN -- 15, 14 16 1 -- 2-5 -- 6, 7 -- 8-11 12 13 -- 20-PIN -- 19, 17 1 2 -- 3-6 -- 7, 9 -- 10-13 14 15 8, 16, 18, 20 A0, A2, A1 A0, A1 EN VNO1-N04 NO1A-NO4A COM COMA, COMB NO8-NO5 NO4B-NO1B V+ GND N.C. Address Inputs Address Inputs Enable Negative-Supply Voltage Input Bidirectional Analog Inputs Bidirectional Analog Inputs Bidirectional Analog outputs Bidirectional Analog outputs Bidirectional Analog Inputs Bidirectional Analog Inputs Positive-Supply Voltage Input Ground No Connection MAX4639 NAME QFN FUNCTION
8
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3.5, Single 8:1 and Dual 4:1, Low-Voltage Analog Multiplexers
Detailed Description
The MAX4638/MAX4639 are low-voltage, CMOS analog muxes. The MAX4638 is an 8:1 mux that switches one of eight inputs (NO1-NO8) to a common output (COM) as determined by the 3-bit binary inputs A0, A1, and A2. The MAX4639 is a 4:1 dual mux that switches one of four differential inputs to a common differential output as determined by the 2-bit binary inputs A0 and A1. Both the MAX4638/MAX4639 have an EN input that can be used to enable or disable the device. When disabled, all channels are switched off. See Truth Tables.
+2.5V D1 V+
MAX4638/MAX4639
MAX4638 MAX4639
*
COM_
*
NO_
*
*
Applications Information
Overvoltage Protection
Proper power-supply sequencing is recommended for all CMOS devices. Do not exceed the absolute maximum ratings because stresses beyond the listed ratings can cause permanent damage to the devices. Always sequence V+ on first, then V-, followed by the logic inputs. If power-supply sequencing is not possible, add two small-signal diodes (D1, D2) in series with the supply pins for overvoltage protection (Figure 1). Adding diodes reduces the analog signal range to one diode drop below V+ and one diode drop above V-, but does not affect the devices' low switch resistance. Device operation is unchanged, and the difference between V+ and V- should not exceed 6V. These protection diodes are not recommended when using a single supply. For single-supply operation, V- should be connected to GND as close to the device as possible.
VD2 -2.5V * INTERNAL PROTECTION DIODES
Figure 1. Overvoltage Protection Using External Blocking Diodes
Ordering Information (continued)
PART MAX4639EGE MAX4639EUE MAX4639ESE MAX4639EGP TEMP RANGE -40C to +85C -40C to +85C -40C to +85C -40C to +85C PIN-PACKAGE 16 QFN (4 4) 16 TSSOP 16 SO 20 QFN (4 4)
Truth Tables
MAX4638 (Single 8-to-1 Mux)
A2 X 0 0 0 0 1 1 1 1 A1 X 0 0 1 1 0 0 1 1 A0 X 0 1 0 1 0 1 0 1 EN 0 1 1 1 1 1 1 1 1 ON SWITCH None NO1 NO2 NO3 NO4 NO5 NO6 NO7 NO8
MAX4639 (Dual 4-to-1 Mux)
A1 X 0 0 1 1 A0 X 0 1 0 1 EN 0 1 1 1 1 COMA None NO1A NO2A NO3A NO4A COMB None NO1B NO2B NO3B NO4B
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9
3.5, Single 8:1 and Dual 4:1, Low-Voltage Analog Multiplexers MAX4638/MAX4639
Test Circuits/Timing Diagrams
V+ V+ A2 A1 A0 VIH VIN EN COM GND V100 VOUT 35pF ADDRESS INPUT VIN +3V 50% 0 tTRANS VN01 NO1B VNO1 SWITCH OUTPUT VOUT VN08 90% 10% NO1 NO2-NO7 VNO1
50
MAX4638
NO8
VNO8 tR < 5ns tF < 5ns
VV+ A1 A0 50 V+
NO1A-NO4A
MAX4639
VIH VIN EN GND
NO4B COMB V100 V-
VNO8 VOUT 35pF
tTRANS
Figure 2. Transition Time
V+ V+
VIH
EN
NO1 NO2-NO7
VNO1
ADDRESS +3V INPUT 0 VA VN0_
50%
tR < 5ns tF < 5ns
A0 A1 VA A2
MAX4638
NO8 GND COM V100 VVNO8 VOUT 35pF SWITCH OUTPUT VOUT
90%
50
0
tBBM
Figure 3. MAX4638 Break-Before-Make Interval
10
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3.5, Single 8:1 and Dual 4:1, Low-Voltage Analog Multiplexers MAX4638/MAX4639
Test Circuits/Timing Diagrams (continued)
V+ VEN EN A0 A1 A2 COM 50 GND V100 VV+ VEN EN A0 V+ NO1B NO_, COMA VNO1 SWITCH OUTPUT VOUT 35pF VOUT V+ NO1 NO2-NO8 VNO1
MAX4638
LOGIC INPUT VEN +3V 50% 0V VNO1
tR < 5ns tF < 5ns
90%
90%
0V
A1 50
MAX4639
GND COMB V100 VVOUT 35pF
tON(EN) tOFF(EN)
Figure 4. Enable Switching Time
V+ RS NO_ VEN VS CHANNEL SELECT EN A0 A1 A2 CL 1nF VOUT VOUT VOUT IS THE MEASURED VOLTAGE DUE TO CHARGE TRANSFER ERROR Q WHEN THE CHANNEL TURNS OFF. VQ = VOUT CL V+ LOGIC INPUT VEN VOUT +3V OFF 0 ON OFF ON ON OFF
MAX4638 MAX4639 COM
GND
V-
Figure 5. Charge Injection
______________________________________________________________________________________
11
3.5, Single 8:1 and Dual 4:1, Low-Voltage Analog Multiplexers MAX4638/MAX4639
Test Circuits/Timing Diagrams (continued)
V+ 1F V+ 1F
VIN RS = 50
NO1 NO8
V+ R 50 VOUT RL 50 CL 5pF RG = 50 VIN
NO1 NO2 NO8 A0 A1 A2
V+
A0 A1 A2
MAX4638 MAX4639 COM
MAX4638 COM MAX4639
V1F VRL 50
VOUT CL 5pF
GND EN
V-
GND EN
VVEN OFF-ISOLATION = 20log VOUT VIN VEN
CROSSTALK = 20log
VOUT VIN
Figure 6. Off-Isolation/On-Channel Bandwidth
Figure 7. Crosstalk
V+ A2 CHANNEL SELECT A1 A0 V+
Chip Information
TRANSISTOR COUNT: 632
NO1 NO8 COM f = 1MHz 1MHz CAPACITANCE ANALYZER
MAX4638 MAX4639
GND EN VV-
VEN
Figure 8. Channel OFF/ON Capacitance
12
______________________________________________________________________________________
3.5, Single 8:1 and Dual 4:1, Low-Voltage Analog Multiplexers
Pin Configurations (continued)
TOP VIEW
GND EN EN
MAX4638/MAX4639
A0
A1
A0 15
16
15
14
13
16
14
A1
A2
VNO1 NO2 NO3
1 2 3 4 5 6 7 8
12 11
GND V+ NO5 NO6
VNO1A NO2A NO3A
1 2 3 4 5 6 7 8
13 12 11
V+ NO1B NO2B NO3B
MAX4638
10 9
MAX4639
10 9
COMA
COMB N.C.
COM
QFN
N.C. N.C. N.C.
NO4A
QFN
N.C.
A0
A1
A0
A2
20
19
18
17
16
20
19
18
17
A1
NO4B 16 15 14
NO8
EN VNO1 NO2 NO3
1 2 3 4 5 10 6 7 8 9
NO4
NO7
15 14
GND V+ NO5 NO6 NO7
EN VNO1A NO2A NO3A
1 2 3 4 5 10 6 7 8 9
GND V+ NO1B NO2B NO3B
MAX4638
13 12 11
MAX4639
13 12 11
COMA
COMB
COM
N.C.
N.C.
NO8
N.C.
QFN
NO4A
QFN
______________________________________________________________________________________
NO4B
NO4
13
3.5, Single 8:1 and Dual 4:1, Low-Voltage Analog Multiplexers MAX4638/MAX4639
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.)
TSSOP.EPS
14
______________________________________________________________________________________
3.5, Single 8:1 and Dual 4:1, Low-Voltage Analog Multiplexers MAX4638/MAX4639
Package Information (continued)
(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.)
SOICN.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.
Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 _____________________15 (c) 2002 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.

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