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19-1592; Rev 1; 1/00
1, Low-Voltage, Single-Supply SPDT Analog Switches
General Description
The MAX4624/MAX4625 are low-on-resistance, lowvoltage single-pole/double-throw (SPDT) analog switches that operate from a single +1.8V to +5.5V supply. The MAX4624 has break-before-make switching; the MAX4625 has make-before-break switching. These devices also have fast switching speeds (tON = 50ns max, tOFF = 50ns max). When powered from a +5V supply, the MAX4624/ MAX4625 offer 1 max on-resistance (RON), with 0.12 max R ON matching and flatness. The digital logic inputs are TTL compatible when using a single +5V supply. These switches also feature overcurrent protection to prevent damage from short circuits and excessive loads. The MAX4624/MAX4625 are pin compatible with the MAX4544 and are available in space-saving 6-pin SOT23 packages. o Low RON 1 max (+5V Supply) 2 max (+3V Supply) o 0.12 max RON Flatness (+5V Supply) o Overcurrent Protection o +1.8V to +5.5V Single-Supply Operation o Available in SOT23 Packages o Fast Switching: tON = 50ns max, tOFF = 50ns max o TTL-Logic Compatible (+5V Supply) o Pin Compatible with MAX4544 o Guaranteed Break-Before-Make (MAX4624) o Guaranteed Make-Before-Break (MAX4625)
Features
MAX4624/MAX4625
Applications
Power Routing Battery-Operated Equipment Audio and Video Signal Routing Low-Voltage Data-Acquisition Systems Communications Circuits PCMCIA Cards Cellular Phones Modems Hard Drives
PART MAX4624EUT-T MAX4625EUT-T
Ordering Information
TEMP. RANGE -40C to +85C -40C to +85C PINPACKAGE 6 SOT23-6 6 SOT23-6 TOP MARK AADL AADM
Pin Configuration/ Functional Diagram/Truth Table
TOP VIEW
MAX4624/MAX4625
IN 1 V+ 2 GND 3 6 5 4 NO COM NC LOGIC 0 1 NC ON OFF NO OFF ON
SOT23-6
SWITCHES SHOWN FOR LOGIC "0" INPUT
________________________________________________________________ Maxim Integrated Products
1
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1, Low-Voltage, Single-Supply SPDT Analog Switches MAX4624/MAX4625
ABSOLUTE MAXIMUM RATINGS
Voltages Referenced to GND V+, IN ....................................................................-0.3V to +6V COM, NC, NO (Note 1)..............................-0.3V to (V+ + 0.3V) Continuous Current NO, NC to COM..............................200mA Peak Current NO, NC to COM (pulsed at 1ms, 10% duty cycle max) ........................ 400mA Continuous Power Dissipation 6-Pin SOT23-6 (derate 7.1mW/C above +70C) .........571mW Operating Temperature Range MAX462_EUT....................................................-40C to +85C Junction Temperature ......................................................+150C Storage Temperature Range .............................-65C to +150C Lead Temperature (soldering, 10s) ................................ +300C
Note 1: Signals on NC, NO, and COM exceeding V+ or GND are clamped by internal diodes.
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--Single +5V Supply
(V+ = +5V 10%, GND = 0, VINH = 2.4V, VINL = 0.8V, TA = TMIN to TMAX, unless otherwise noted.) (Notes 2, 3) PARAMETER ANALOG SWITCH Analog Signal Range On-Resistance On-Resistance Match Between Channels (Note 4) On-Resistance Flatness (Note 5) NO or NC Off-Leakage Current COM On-Leakage Current Overcurrent-Protection Current Threshold DYNAMIC Turn-On Time Turn-Off Time Break-Before-Make Delay (Note 6) Make-Before-Break Delay (Note 6) tON tOFF tBBM tMBB VNO or VNC = 3V, Figure 2 VNO or VNC = 3V, Figure 2 MAX4624 only, Figure 3a MAX4625 only, Figure 3b TA = +25C TA = TMIN to TMAX TA = +25C TA = TMIN to TMAX TA = +25C TA = TMIN to TMAX TA = +25C TA = TMIN to TMAX 1 1 1 1 6 20 40 40 50 60 50 60 ns ns ns ns VCOM, VNO, VNC RON RON RFLAT(ON) INO(OFF), INC(OFF) ICOM(ON) V+ = 4.5V, VNO or VNC = 3.5V, ICOM = 100mA V+ = 4.5V, ICOM = 100mA, VNO or VNC = 3.5V V+ = 4.5V; ICOM = 100mA; VNO or VNC = 0, 1V, 2V TA = +25C TA = TMIN to TMAX TA = +25C TA = TMIN to TMAX TA = +25C TA = TMIN to TMAX -2 -20 -4 -40 1.2 0.3 0.01 0.08 0.06 0 0.65 V+ 1 1.2 0.12 0.15 0.12 0.15 2 20 4 nA 40 A V nA SYMBOL CONDITIONS MIN TYP MAX UNITS
V+ = 5.5V; VCOM = 1V, 4.5V; TA = +25C VNO or VNC = 4.5V, 1V TA = TMIN to TMAX V+ = 5.5V; VCOM = 1V, 4.5V; TA = +25C VNO or VNC = 1V, 4.5V, or TA = TMIN to TMAX floating TA = +25C
2
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1, Low-Voltage, Single-Supply SPDT Analog Switches MAX4624/MAX4625
ELECTRICAL CHARACTERISTICS--Single +5V Supply (continued)
(V+ = +5V 10%, GND = 0, VINH = 2.4V, VINL = 0.8V, TA = TMIN to TMAX, unless otherwise noted.) (Notes 2, 3) PARAMETER Charge Injection Off-Isolation (Note 7) Crosstalk (Note 8) NC or NO Off-Capacitance COM On-Capacitance LOGIC INPUT Input Voltage Low Input Voltage High Logic Input Current SUPPLY Power-Supply Range Positive Supply Current V+ I+ V+ = 5.5V, VIN = 0 or V+ 1.8 5.5 10 V A VINL VINH IIN 2.4 -1 1 0.8 V V A COFF CCOM(ON) SYMBOL Q OIRR CONDITIONS CL = 1.0nF, VGEN = 0, RGEN = 0, TA = +25C, Figure 4 RL = 50, CL = 5pF, f = 1MHz, TA = +25C, Figure 5 RL = 50, CL = 5pF, f = 1MHz, TA = +25C, Figure 5 f = 1MHz, TA = +25C, Figure 6 f = 1MHz, TA = +25C, Figure 6 MIN TYP 65 -57 -57 32 100 MAX UNITS pC dB dB pF pF
ELECTRICAL CHARACTERISTICS--Single +3V Supply
(V+ = +2.7V to +3.6V, GND = 0, VINH = 2.0V, VINL = 0.6V, TA = TMIN to TMAX, unless otherwise noted.) (Notes 2, 3) PARAMETER ANALOG SWITCH Analog Signal Range VCOM, VNO, VNC RON V+ = 2.7V, VNO or VNC = 1.5V, ICOM = 100mA TA = +25C TA = TMIN to TMAX 0.25 0 1.2 V+ 2.0 2.5 V SYMBOL CONDITIONS MIN TYP MAX UNITS
On-Resistance On-Resistance Flatness (Note 6) DYNAMIC Turn-On Time Turn-Off Time Break-Before-Make Time Delay (Note 4) Make-Before-Break Time Delay (Note 4) Charge Injection

RFLAT(ON)
V+ = 2.7V; ICOM = 100mA; VNO or VNC = 0, 0.75V, 1.5V; TA = +25C VNO or VNC = 1.5V, Figure 2 VNO or VNC = 1.5V, Figure 2 MAX4624 only, Figure 3a MAX4625 only, Figure 3b CL = 1.0nF, Figure 4, VGEN = 0, RGEN = 0, TA = +25C TA = +25C TA = TMIN to TMAX TA = +25C TA = TMIN to TMAX 1 1
tON tOFF tBBM tMBB Q
65 62
80 100 80 100
ns ns ns ns pC
40 8 40
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1, Low-Voltage, Single-Supply SPDT Analog Switches MAX4624/MAX4625
ELECTRICAL CHARACTERISTICS--Single +3V Supply (continued)
(V+ = +2.7V to +3.6V, GND = 0, VINH = 2.0V, VINL = 0.6V, TA = TMIN to TMAX, unless otherwise noted.) (Notes 2, 3) PARAMETER LOGIC INPUT Input Voltage Low Input Voltage High Logic Input Current SUPPLY Positive Supply Current I+ V+ = 3.6V, VIN = 0 or V+ 10 A VINL VINH IIN 2.0 -1 1 0.6 V V A SYMBOL CONDITIONS MIN TYP MAX UNITS
Note 2: The algebraic convention, where the most negative value is a minimum and the most positive value is a maximum, is used in this data sheet. Note 3: SOT-packaged parts are 100% tested at +25C. Limits across the full temperature range are guaranteed by design and correlation. Note 4: RON = RON(MAX) - RON(MIN). Note 5: Flatness is defined as the difference between the maximum and minimum values of on-resistance as measured over the specified analog signal range. Note 6: Guaranteed by design. Note 7: Off-Isolation = 20log10 [VCOM / (VNC or VNO)], VCOM = output, VNC or VNO = input to off switch. Note 8: Between the two switches.
__________________________________________Typical Operating Characteristics
(TA = +25C, unless otherwise noted.)
ON-RESISTANCE vs. COM VOLTAGE OVER SUPPLY VOLTAGE
MAX4624 toc01
ON-RESISTANCE vs. COM VOLTAGE OVER TEMPERATURE
MAX4624 toc02
TURN-ON/OFF TIMES vs. SUPPLY VOLTAGE
MAX4624 toc03
6 5 4 RON () 3 2 1 0 0 1 2 3 +2.3V +2.5V +3.0V +1.8V
VCOM = 100mA
1.00
T = +105C TA = +85C A TA = +25C
120 100 80 60 40 tOFF 20 0
0.75 RON () +2.0V tON/tOFF (ns)
0.50 TA = -40C TA = -55C 0.25
tON
+5V 0 4 5 0
V+ = 5V ICOM = 100mA 1 2 VCOM (V) 3 4 5
2
3
4 VSUPPLY (V)
5
6
VCOM (V)
4
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1, Low-Voltage, Single-Supply SPDT Analog Switches
_____________________________Typical Operating Characteristics (continued)
(TA = +25C, unless otherwise noted.)
ON/OFF-LEAKAGE CURRENT vs. TEMPERATURE
MAX4624TOC5 MAX4624TOC4
MAX4624/MAX4625
TURN-ON/OFF TIMES vs. TEMPERATURE
50 V+ = 5V VNO or VNC = 3V 10
CHARGE INJECTION vs. COM VOLTAGE
MAX4624 toc06
100 50 0
40 tON/tOFF (ns)
ON/OFF-LEAKAGE (nA)
1
MAX4625
0.1
Q (pC)
30 tON
MAX4624 -50 -100
20
0.01 10 tOFF 0.001 -40 -20 0 20 40 60 80 -40 -20 0 20 40 60 80 100 TEMPERATURE (C) TEMPERATURE (C) -150 -200 0 1 2 3 4 5 VCOM (V)
0
FREQUENCY RESPONSE
0 -10 -20 -30 LOSS (dB) -40 -50 -60 -70 -80 -90 30k 100k 1M FREQUENCY (Hz) V+ = 5V 50 = IN/OUT 10M OFF-ISOLATION ON-PHASE ON-LOSS
MAX4624 toc07
LOGIC THRESHOLD VOLTAGE vs. SUPPLY VOLTAGE
-0 LOGIC THRESHOLD VOLTAGE (V) -10 PHASE (degrees) -20 -30 -40 -50 -60 -70 0 2 3 4 SUPPLY VOLTAGE (V) 5 6 2.0 VIN RISING 1.5 VIN FALLING
MAX4624 toc08
10
2.5
1.0
0.5
-80 100M
TOTAL HARMONIC DISTORTION vs. FREQUENCY
MAX4624 toc09
OVERCURRENT RESPONSE
3.3V 0
MAX4624 toc10
0.1
VCOM 2V/div
THD (%)
0.01 1.5A 0 0.001 10 100 1k FRQUENCY (Hz) 10k 100k 1ms/div ICOM 1A/div
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1, Low-Voltage, Single-Supply SPDT Analog Switches MAX4624/MAX4625
Pin Description
PIN NAME IN V+ GND NC COM NO Digital Control Input Positive Supply Voltage Input Ground Analog Switch--Normally Closed Analog Switch--Common Analog Switch--Normally Open FUNCTION
1
2 3 4 5 6
Detailed Description
The MAX4624/MAX4625 are low-on-resistance (RON), low-voltage, single-pole/double-throw (SPDT) analog switches that operate from a +1.8V to +5.5V supply. The MAX4624 has break-before-make switching, and the MAX4625 has make-before-break switching. These devices also have fast switching speeds (tON = 50ns max, tOFF = 50ns max). When powered from a +5V supply, their 1 max RON allows high continuous currents to be switched in a variety of applications. In an overcurrent condition, these switches provide both current-limit and thermalshutdown protection.
over time, so current limiting will not activate when the switch output charges a small 0.1F capacitor. For sustained overload conditions, the switch turns off (opens). The switch turns on after 5ms. If the overload persists, the switch cycles off and on to produce a pulsed output. A direct short circuit will be detected immediately, and the switch will pulse on for 1s, then remain off for 5ms.
Applications Information
Logic Inputs
The MAX4624/MAX4625 logic inputs can be driven up to +5.5V regardless of the supply voltage. For example, with a +3.3V supply, IN may be driven low to 0V and high to 5.5V. Driving IN Rail-to-Rail(R) minimizes power consumption.
Current-Limit Protection
The MAX4624/MAX4625 feature current-limit protection circuitry. When the voltage drop across the on switch reaches 0.6V typ, the internal circuitry activates. The current limit is not instantaneous, but rather integrates
POSITIVE SUPPLY D1 V+
Analog Signal Levels
Analog signals that range over the entire supply voltage (V+ to GND) can be passed with very little change in on-resistance (see Typical Operating Characteristics). The switches are bidirectional, so the NO, NC, and COM pins can be used as either inputs or outputs.
MAX4624 MAX4625
NO Vg COM
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 the devices. 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
GND D2
Figure 1. Overvoltage Protection Using Two External Blocking Diodes
Rail-to-Rail is a registered trademark of Nippon Motorola, Ltd.
6
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1, Low-Voltage, Single-Supply SPDT Analog Switches
a small-signal diode (D1) as shown in Figure 1. If the analog signal can dip below GND, add D2. Adding protection diodes reduces the analog range to a diode drop (about 0.7V) below V+ (for D1), and a diode drop above ground (for D2). On-resistance increases slightly at low supply voltages. Maximum supply voltage (V+) must not exceed +6V. Adding protection diode D2 causes the logic threshold to be shifted relative to GND. TTL compatibility is not guaranteed when D2 is added. Protection diodes D1 and D2 also protect against some overvoltage situations. With 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, no damage will result.
MAX4624/MAX4625
Test Circuits/Timing Diagrams
MAX4624 MAX4625
VIN_ NO OR NC V+ V+ COM RL 50 IN LOGIC INPUT GND SWITCH OUTPUT 0V t ON LOGIC INPUT VOUT CL 35pF VOUT 0.9 * V0UT t OFF 0.9 * VOUT VINH 50% VINL t r < 5ns t f < 5ns
CL INCLUDES FIXTURE AND STRAY CAPACITANCE. RL VOUT = VN_ RL + RON
(
)
LOGIC INPUT WAVEFORMS INVERTED FOR SWITCHES THAT HAVE THE OPPOSITE LOGIC SENSE.
Figure 2. Switching Time
MAX4624
V+ V+ LOGIC INPUT COM NO IN RL 50 GND VOUT CL 35pF VOUT
VINH 50% VINL
VN_
NC
LOGIC INPUT
0.9 * VOUT tD
CL INCLUDES FIXTURE AND STRAY CAPACITANCE.
Figure 3a. Break-Before-Make Interval (MAX4624 only) _______________________________________________________________________________________ 7
1, Low-Voltage, Single-Supply SPDT Analog Switches MAX4624/MAX4625
MAX4625
V+ V+ NC VCOM NO RL 50 LOGIC INPUT GND VNQ CL INCLUDES FIXTURE AND STRAY CAPACITANCE. VNO CL 35pF RL 50 CL 35pF VNC LOGIC INPUT VINH VINL VNC
0.8 * VOUT
0.8 * VOUT tMBB
Figure 3b. Make-Before-Break Interval (MAX4625 only)
V+
MAX4624 MAX4625
RGEN NC OR NO GND IN
VOUT VOUT VOUT CL IN OFF ON OFF
V+ COM
V GEN
VINL TO VINH
IN
OFF
ON Q = (V OUT )(C L )
OFF
IN DEPENDS ON SWITCH CONFIGURATION; INPUT POLARITY DETERMINED BY SENSE OF SWITCH.
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 V CROSSTALK = 20log OUT VIN
NC 50
MAX4624 MAX4625
NO GND
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. On-Loss, Off-Isolation, and Crosstalk 8 _______________________________________________________________________________________
1, Low-Voltage, Single-Supply SPDT Analog Switches
Chip Information
10nF V+
MAX4624/MAX4625
TRANSISTOR COUNT: 186
V+ COM
MAX4624 MAX4625
IN VINL OR VINH
CAPACITANCE METER f = 1MHz
NC or NO GND
Figure 6. Channel Off/On-Capacitance
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1, Low-Voltage, Single-Supply SPDT Analog Switches MAX4624/MAX4625
Package Information
6LSOT.EPS
10
______________________________________________________________________________________
1, Low-Voltage, Single-Supply SPDT Analog Switches MAX4624/MAX4625
NOTES
______________________________________________________________________________________
11
1, Low-Voltage, Single-Supply SPDT Analog Switches MAX4624/MAX4625
NOTES
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.
12 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 (c) 2000 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.

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