General Description
The MAX4624/MAX4625 are low-on-resistance, low-
voltage single-pole/double-throw (SPDT) analog switch-
es 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 1Ωmax on-resistance (RON), with 0.12Ω
max RON matching and flatness. The digital logic
inputs are TTL compatible when using a single +5V
supply. These switches also feature overcurrent protec-
tion to prevent damage from short circuits and exces-
sive loads.
The MAX4624/MAX4625 are pin compatible with the
MAX4544 and are available in space-saving standard
6-pin SOT23 packages, as well as the 1.0mm high Thin
SOT package.
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
Features
♦Low RON
1Ωmax (+5V Supply)
2Ωmax (+3V Supply)
♦0.12Ωmax RON Flatness (+5V Supply)
♦Overcurrent Protection
♦+1.8V to +5.5V Single-Supply Operation
♦Available in SOT23 Packages
♦Fast Switching: tON = 50ns max, tOFF = 50ns max
♦TTL-Logic Compatible (+5V Supply)
♦Pin Compatible with MAX4544
♦Guaranteed Break-Before-Make (MAX4624)
♦Guaranteed Make-Before-Break (MAX4625)
MAX4624/MAX4625
1Ω, Low-Voltage, Single-Supply
SPDT Analog Switches
________________________________________________________________ Maxim Integrated Products 1
TOP VIEW
6
5
4
1
2
3
NO
COM
NC
GND
V+
IN
MAX4624/MAX4625
SOT23-6
LOGIC NC
0
1
ON
OFF
NO
OFF
ON
SWITCHES SHOWN
FOR LOGIC “0” INPUT
19-1592; Rev 2; 5/01
PART
MAX4624EUT-T
MAX4624EZT-T -40°C to +85°C
-40°C to +85°C
TEMP. RANGE PIN-
PACKAGE
6 SOT23-6
6 SOT23-6*
Pin Configuration/
Functional Diagram/Truth Table
Ordering Information
TOP
MARK
AADL
AAAE
MAX4625EUT-T -40°C to +85°C 6 SOT23-6 AADM
MAX4625EZT-T -40°C to +85°C 6 SOT23-6* AAAF
*Thin SOT (1.0mm height) package. Recommended for new
designs.
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.
MAX4624/MAX4625
1Ω, Low-Voltage, Single-Supply
SPDT Analog Switches
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
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)
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.
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 (derate 7.1mW/°C above +70°C).............571mW
6-Pin Thin SOT23 (derate 6.25mW/°C above +70°C)...500mW
Operating Temperature Range
MAX462_E_T ....................................................-40°C to +85°C
Junction Temperature......................................................+150°C
Storage Temperature Range .............................-65°C to +150°C
Note 1: Signals on NC, NO, and COM exceeding V+ or GND are clamped by internal diodes.
PARAMETER SYMBOL MIN TYP MAX UNITS
Analog Signal Range VCOM, VNO,
VNC 0V+V
0.65 1
On-Resistance RON V+ = 4.5V, VNO or
VNC = 3.5V, ICOM = 100mA
TA= +25°C
1.2
Ω
0.06 0.12
On-Resistance Match Between
Channels (Note 4) ∆RON V+ = 4.5V, ICOM = 100mA,
VNO or VNC = 3.5V
TA= +25°C
0.15
Ω
0.08 0.12
On-Resistance Flatness
(Note 5) RFLAT(ON) V+ = 4.5V; ICOM = 100mA;
VNO or VNC = 0, 1V, 2V
TA= +25°C
0.15
Ω
-2 0.01 2
NO or NC Off-Leakage
Current
INO(OFF),
INC(OFF)
V+ = 5.5V; VCOM = 1V, 4.5V;
VNO or VNC = 4.5V, 1V
TA= +25°C
-20 20 nA
COM On-Leakage
Current
V+ = 5.5V; VCOM = 1V, 4.5V;
VNO or VNC = 1V, 4.5V, or
floating
-4 0.3 4
ICOM(ON)
TA= +25°C
-40 40
nA
Overcurrent-Protection
Current Threshold 1.2 A
TA= +25°C 40 50
Turn-On Time tON VNO or VNC = 3V, Figure 2 TA= TMIN to TMAX 60 ns
TA= +25°C 40 50
Turn-Off Time tOFF VNO or VNC = 3V, Figure 2 TA= TMIN to TMAX 60 ns
Break-Before-Make Delay
(Note 6) tBBM MAX4624 only, Figure 3a 120 ns
16
Make-Before-Break Delay
(Note 6) tMBB MAX4625 only, Figure 3b 1ns
TA= TMIN to TMAX
TA= TMIN to TMAX
TA= TMIN to TMAX
TA= TMIN to TMAX
CONDITIONS
1
DYNAMIC
ANALOG SWITCH
TA= TMIN to TMAX
TA= +25°C
TA= +25°C
TA= TMIN to TMAX
TA= +25°C
TA= TMIN to TMAX
MAX4624/MAX4625
1Ω, Low-Voltage, Single-Supply
SPDT Analog Switches
_______________________________________________________________________________________ 3
PARAMETER SYMBOL MIN TYP MAX UNITSCONDITIONS
pC
Off-Isolation (Note 7) OIRR RL= 50Ω, CL= 5pF, f = 1MHz, TA= +25°C,
Figure 5 -57 dB
Crosstalk (Note 8) RL= 50Ω, CL= 5pF, f = 1MHz, TA= +25°C,
Figure 5 -57 dB
NC or NO Off-Capacitance COFF f = 1MHz, TA= +25°C, Figure 6 32 pF
COM On-Capacitance CCOM(ON) f = 1MHz, TA= +25°C, Figure 6 100 pF
Input Voltage Low VINL 0.8 V
Input Voltage High VINH 2.4 V
Logic Input Current IIN -1 1 µA
Power-Supply Range V+ 1.8 5.5 V
Positive Supply Current I+ V+ = 5.5V, VIN = 0 or V+ 10 µA
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)
V0V+
VCOM, VNO,
VNC
Analog Signal Range
CONDITIONS UNITSMIN TYP MAXSYMBOLPARAMETER
ns
65 80
100
VNO or VNC = 1.5V,
Figure 2
tON
Turn-On Time
ns
62 80
100
VNO or VNC = 1.5V,
Figure 2
tOFF
Turn-Off Time
TA= +25°C
TA= TMIN to TMAX
TA= +25°C
TA= TMIN to TMAX
ns140tBBM
Break-Before-Make Time
Delay (Note 4)
ns18tMBB
Make-Before-Break Time
Delay (Note 4)
pC40QCharge Injection
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)
Charge Injection CL= 1.0nF, VGEN = 0, RGEN = 0, TA= +25°C,
Figure 4
Q65
2.5
Ω
1.2 2.0
V+ = 2.7V,
VNO or VNC = 1.5V,
ICOM = 100mA
RON
On-Resistance
TA= +25°C
TA= TMIN to TMAX
MAX4624 only, Figure 3a
MAX4625 only, Figure 3b
CL= 1.0nF, Figure 4, VGEN = 0,
RGEN = 0, TA= +25°C
SUPPLY
LOGIC INPUT
0.25 Ω
V+ = 2.7V; ICOM = 100mA; VNO or VNC = 0,
0.75V, 1.5V; TA= +25°C
RFLAT(ON)
On-Resistance Flatness
(Note 6)
ANALOG SWITCH
DYNAMIC
MAX4624/MAX4625
1Ω, Low-Voltage, Single-Supply
SPDT Analog Switches
4 _______________________________________________________________________________________
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)
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 +25°C. 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.
V2.0VINH
Input Voltage High
V0.6VINL
Input Voltage Low
CONDITIONS UNITSMIN TYP MAXSYMBOLPARAMETER
µA10V+ = 3.6V, VIN = 0 or V+I+Positive Supply Current
µA-1 1IIN
Logic Input Current
LOGIC INPUT
SUPPLY
__________________________________________Typical Operating Characteristics
(TA= +25°C, unless otherwise noted.)
0
1
2
3
4
5
6
012345
ON-RESISTANCE vs. COM VOLTAGE
OVER SUPPLY VOLTAGE
MAX4624 toc01
VCOM (V)
RON (Ω)
VCOM = 100mA
+2.0V
+2.3V
+2.5V
+3.0V
+5V
+1.8V
1.00
0.75
0.50
0.25
0
021 345
ON-RESISTANCE vs. COM VOLTAGE
OVER TEMPERATURE
MAX4624 toc02
VCOM (V)
RON (Ω)
TA = +85°CTA = +105°C
TA = +25°C
TA = -40°C
TA = -55°C
V+ = 5V
ICOM = 100mA
0
40
tON
tOFF
20
80
60
100
120
24356
TURN-ON/OFF TIMES
vs. SUPPLY VOLTAGE
MAX4624 toc03
VSUPPLY (V)
tON/tOFF (ns)
MAX4624/MAX4625
1Ω, Low-Voltage, Single-Supply
SPDT Analog Switches
_______________________________________________________________________________________ 5
0
10
30
20
40
50
-40 0-20 20406080
TURN-ON/OFF TIMES vs. TEMPERATURE
MAX4624TOC4
TEMPERATURE (°C)
tON/tOFF (ns)
tON
V+ = 5V
VNO or VNC = 3V
tOFF
0.01
0.001
0.1
1
10
-40 0-20 20406080100
ON/OFF-LEAKAGE CURRENT
vs. TEMPERATURE
MAX4624TOC5
TEMPERATURE (°C)
ON/OFF-LEAKAGE (nA)
-200
-100
-150
0
-50
50
100
021 345
CHARGE INJECTION vs. COM VOLTAGE
MAX4624 toc06
VCOM (V)
Q (pC)
MAX4625
MAX4624
0
-90
30k 100k 1M 10M 100M
FREQUENCY RESPONSE
-80
MAX4624 toc07
FREQUENCY (Hz)
LOSS (dB)
PHASE (degrees)
-30
-40
-50
-60
-70
-20
-10
10
-80
-70
-20
-30
-40
-50
-60
-10
-0
V+ = 5V
50Ω = IN/OUT
OFF-ISOLATION
ON-LOSS
ON-PHASE
0
0.5
1.5
1.0
2.0
2.5
LOGIC THRESHOLD VOLTAGE
vs. SUPPLY VOLTAGE
MAX4624 toc08
SUPPLY VOLTAGE (V)
LOGIC THRESHOLD VOLTAGE (V)
24356
VIN RISING
VIN FALLING
0.1
0.001
10 100 1k 10k 100k
TOTAL HARMONIC DISTORTION
vs. FREQUENCY
MAX4624 toc09
FRQUENCY (Hz)
THD (%)
0.01
0
1.5A
0
3.3V
MAX4624 toc10
1ms/div
OVERCURRENT RESPONSE
VCOM
2V/div
ICOM
1A/div
_____________________________Typical Operating Characteristics (continued)
(TA= +25°C, unless otherwise noted.)
MAX4624/MAX4625
1Ω, Low-Voltage, Single-Supply
SPDT Analog Switches
6 _______________________________________________________________________________________
Pin Description
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 1Ωmax RON
allows high continuous currents to be switched in a
variety of applications. In an overcurrent condition,
these switches provide both current-limit and thermal-
shutdown protection.
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
over time, so current limiting will not activate when the
switch output charges a small 0.1µF capacitor. For sus-
tained 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 out-
put. A direct short circuit will be detected immediately,
and the switch will pulse on for 1µs, 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®minimizes power
consumption.
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.
Power-Supply Sequencing and
Overvoltage Protection
Caution: Do not exceed the absolute maximum rat-
ings 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
Analog Switch—CommonCOM5
Analog Switch—Normally OpenNO6
Analog Switch—Normally ClosedNC4
GroundGND3
PIN
Positive Supply Voltage InputV+2
Digital Control InputIN
1
FUNCTIONNAME
POSITIVE SUPPLY
COM
NO
D2
D1
GND
Vg
V+
MAX4624
MAX4625
Figure 1. Overvoltage Protection Using Two External Blocking
Diodes Rail-to-Rail is a registered trademark of Nippon Motorola, Ltd.
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 sup-
ply 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
1Ω, Low-Voltage, Single-Supply
SPDT Analog Switches
_______________________________________________________________________________________ 7
tr < 5ns
tf < 5ns
50%
VINL
LOGIC
INPUT
RL
50Ω
COM
GND
IN
CL INCLUDES FIXTURE AND STRAY CAPACITANCE.
VOUT = VN_ ( RL )
RL + RON
VIN_
VINH
tOFF
0V
NO
OR NC
0.9 · V0UT 0.9 · VOUT
tON
VOUT
SWITCH
OUTPUT
LOGIC
INPUT
LOGIC INPUT WAVEFORMS INVERTED FOR SWITCHES
THAT HAVE THE OPPOSITE LOGIC SENSE.
V+
CL
35pF
V+
VOUT
MAX4624
MAX4625
Figure 2. Switching Time
Test Circuits/Timing Diagrams
50%
VINH
VINL
LOGIC
INPUT
VOUT 0.9 · VOUT
tD
LOGIC
INPUT
RL
50Ω
GND
CL INCLUDES FIXTURE AND STRAY CAPACITANCE.
NO
IN
NC VOUT
V+
V+
CL
35pF
VN_ COM
MAX4624
Figure 3a. Break-Before-Make Interval (MAX4624 only)
MAX4624/MAX4625
1Ω, Low-Voltage, Single-Supply
SPDT Analog Switches
8 _______________________________________________________________________________________
LOGIC
INPUT
0.8 • VOUT
0.8 • VOUT
VINH
VINL
VNC
VNC
VNO
VNQ tMBB
LOGIC
INPUT
RL
50Ω
RL
50Ω
GND
CL INCLUDES FIXTURE AND STRAY CAPACITANCE.
NO
NC
VCOM
V+
V+
CL
35pF
CL
35pF
MAX4625
Figure 3b. Make-Before-Break Interval (MAX4625 only)
VGEN GND
COM
CL
VOUT
V+ VOUT
IN
OFF ON OFF
∆VOUT
Q = (∆VOUT)(CL)
NC
OR NO
IN DEPENDS ON SWITCH CONFIGURATION;
INPUT POLARITY DETERMINED BY SENSE OF SWITCH.
OFF ON OFF
IN
VINL TO VINH
V+
RGEN
IN
MAX4624
MAX4625
Figure 4. Charge Injection
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.
+5V
VOUT
V+
IN
NC
COM
NO
VIN
MAX4624
MAX4625
OFF-ISOLATION = 20log VOUT
VIN
ON-LOSS = 20log VOUT
VIN
CROSSTALK = 20log VOUT
VIN
NETWORK
ANALYZER
50Ω
50Ω50Ω
50Ω
MEAS REF
10nF
0V OR V+
50Ω
GND
Figure 5. On-Loss, Off-Isolation, and Crosstalk
Test Circuits/Timing Diagrams (continued)
MAX4624/MAX4625
1Ω, Low-Voltage, Single-Supply
SPDT Analog Switches
_______________________________________________________________________________________ 9
CAPACITANCE
METER NC or
NO
COM
GND
IN VINL
OR
VINH
10nF V+
f = 1MHz
V+
MAX4624
MAX4625
Figure 6. Channel Off/On-Capacitance
TRANSISTOR COUNT: 186
Chip Information
MAX4624/MAX4625
1Ω, Low-Voltage, Single-Supply
SPDT Analog Switches
10 ______________________________________________________________________________________
6LSOT.EPS
Package Information
MAX4624/MAX4625
1Ω, Low-Voltage, Single-Supply
SPDT Analog Switches
Package Information (continued)
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 ____________________ 11
© 2001 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.
