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, t
OFF
= 50ns max).
When powered from a +5V supply, the MAX4624/
MAX4625 offer 1Ω max on-resistance (RON), with 0.12Ω
max RONmatching 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 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 R
ON
1Ω max (+5V Supply)
2Ω max (+3V Supply)
♦ 0.12Ω max R
ON
Flatness (+5V Supply)
♦ Overcurrent Protection
♦ +1.8V to +5.5V Single-Supply Operation
♦ Available in SOT23 Packages
♦ Fast Switching: t
ON
= 50ns max, t
OFF
= 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
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.
TOP VIEW
MAX4624/MAX4625
IN
1
V+
2
GND
3
SOT23-6
NO
6
COM
5
NC
4
LOGIC NC
ON
0
OFF
1
SWITCHES SHOWN
FOR LOGIC “0” INPUT
NO
OFF
ON
MAX4624/MAX4625
1Ω, Low-Voltage, Single-Supply
SPDT Analog Switches
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS—Single +5V Supply
(V+ = +5V ±10%, GND = 0, V
INH
= 2.4V, V
INL
= 0.8V, TA= T
MIN
to T
MAX
, 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
V
COM
, VNO,
V
NC
0V+V
0.65 1
On-Resistance R
ON
V+ = 4.5V, VNOor
VNC= 3.5V, I
COM
= 100mA
TA= +25°C
1.2
Ω
0.06 0.12
On-Resistance Match Between
Channels (Note 4)
∆R
ON
V+ = 4.5V, I
COM
= 100mA,
VNOor VNC= 3.5V
TA= +25°C
0.15
Ω
0.08 0.12
On-Resistance Flatness
(Note 5)
R
FLAT(ON)
V+ = 4.5V; I
COM
= 100mA;
VNOor VNC= 0, 1V, 2V
TA= +25°C
0.15
Ω
-2 0.01 2
NO or NC Off-Leakage
Current
I
NO(OFF)
,
I
NC(OFF)
V+ = 5.5V; V
COM
= 1V, 4.5V;
VNOor VNC= 4.5V, 1V
TA= +25°C
-20 20
nA
COM On-Leakage
Current
V+ = 5.5V; V
COM
= 1V, 4.5V;
VNOor VNC= 1V, 4.5V, or
floating
-4 0.3 4
I
COM(ON)
TA= +25°C
-40 40
nA
Overcurrent-Protection
Current Threshold
1.2 A
TA= +25°C 40 50
Turn-On Time t
ON
VNOor VNC= 3V, Figure 2
TA= T
MIN
to T
MAX
60
ns
TA= +25°C 40 50
Turn-Off Time t
OFF
VNOor VNC= 3V, Figure 2
TA= T
MIN
to T
MAX
60
ns
Break-Before-Make Delay
(Note 6)
t
BBM
MAX4624 only, Figure 3a
120
ns
16
Make-Before-Break Delay
(Note 6)
t
MBB
MAX4625 only, Figure 3b
1
ns
TA= T
MIN
to T
MAX
TA= T
MIN
to T
MAX
TA= T
MIN
to T
MAX
TA= T
MIN
to T
MAX
CONDITIONS
1
DYNAMIC
ANALOG SWITCH
TA= T
MIN
to T
MAX
TA= +25°C
TA= +25°C
TA= T
MIN
to T
MAX
TA= +25°C
TA= T
MIN
to T
MAX
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 C
OFF
f = 1MHz, TA= +25°C, Figure 6 32 pF
COM On-Capacitance C
COM(ON)
f = 1MHz, TA= +25°C, Figure 6 100 pF
Input Voltage Low V
INL
0.8 V
Input Voltage High V
INH
2.4 V
Logic Input Current I
IN
-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, V
INH
= 2.0V, V
INL
= 0.6V, TA= T
MIN
to T
MAX
, unless otherwise noted.) (Notes 2, 3)
V0V+
V
COM
, VNO,
V
NC
Analog Signal Range
CONDITIONS UNITSMIN TYP MAXSYMBOLPARAMETER
ns
65 80
100
VNOor VNC= 1.5V,
Figure 2
t
ON
Turn-On Time
ns
62 80
100
VNOor VNC= 1.5V,
Figure 2
t
OFF
Turn-Off Time
TA= +25°C
TA= T
MIN
to T
MAX
TA= +25°C
TA= T
MIN
to T
MAX
ns140t
BBM
Break-Before-Make Time
Delay (Note 4)
ns18t
MBB
Make-Before-Break Time
Delay (Note 4)
pC40QCharge Injection
ELECTRICAL CHARACTERISTICS—Single +5V Supply (continued)
(V+ = +5V ±10%, GND = 0, V
INH
= 2.4V, V
INL
= 0.8V, TA= T
MIN
to T
MAX
, unless otherwise noted.) (Notes 2, 3)
Charge Injection
CL= 1.0nF, V
GEN
= 0, R
GEN
= 0, TA= +25°C,
Figure 4
Q 65
2.5
Ω
1.2 2.0
V+ = 2.7V,
V
NO
or VNC= 1.5V,
I
COM
= 100mA
R
ON
On-Resistance
TA= +25°C
TA= T
MIN
to T
MAX
MAX4624 only, Figure 3a
MAX4625 only, Figure 3b
CL= 1.0nF, Figure 4, V
GEN
= 0,
R
GEN
= 0, TA= +25°C
SUPPLY
LOGIC INPUT
0.25 Ω
V+ = 2.7V; I
COM
= 100mA; VNOor VNC= 0,
0.75V, 1.5V; T
A
= +25°C
R
FLAT(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, V
INH
= 2.0V, V
INL
= 0.6V, TA= T
MIN
to T
MAX
, 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: ∆R
ON
= R
ON(MAX)
- R
ON(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 = 20log
10[VCOM
/ (VNCor VNO)], V
COM
= output, VNCor VNO= input to off switch.
Note 8: Between the two switches.
V2.0V
INH
Input Voltage High
V0.6V
INL
Input Voltage Low
CONDITIONS UNITSMIN TYP MAXSYMBOLPARAMETER
µA10V+ = 3.6V, VIN= 0 or V+I+Positive Supply Current
µA-1 1I
IN
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
V
COM
(V)
R
ON
(Ω)
V
COM
= 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
V
COM
(V)
R
ON
(Ω)
TA = +85°C
TA = +105°C
TA = +25°C
TA = -40°C
TA = -55°C
V+ = 5V
I
COM
= 100mA
0
40
t
ON
t
OFF
20
80
60
100
120
24356
TURN-ON/OFF TIMES
vs. SUPPLY VOLTAGE
MAX4624 toc03
V
SUPPLY
(V)
t
ON
/t
OFF
(ns)
MAX4624/MAX4625
1Ω, Low-Voltage, Single-Supply
SPDT Analog Switches
_______________________________________________________________________________________ 5
_____________________________Typical Operating Characteristics (continued)
(TA= +25°C, unless otherwise noted.)
TURN-ON/OFF TIMES vs. TEMPERATURE
50
V+ = 5V
or VNC = 3V
V
NO
40
30
(ns)
OFF
/t
ON
t
20
10
0
-40 0-20 20406080
t
ON
TEMPERATURE (°C)
t
OFF
FREQUENCY RESPONSE
0
-10
-20
-30
-40
-50
LOSS (dB)
-60
-70
-80
-90
30k 100k 1M 10M 100M
ON-PHASE
OFF-ISOLATION
FREQUENCY (Hz)
TOTAL HARMONIC DISTORTION
vs. FREQUENCY
0.1
ON-LOSS
MAX4624TOC4
MAX4624 toc07
V+ = 5V
50Ω = IN/OUT
ON/OFF-LEAKAGE CURRENT
10
1
0.1
ON/OFF-LEAKAGE (nA)
0.01
0.001
-40 0-20 2040 6080100
10
-0
-10
-20
-30
-40
-50
-60
-70
-80
MAX4624 toc09
vs. TEMPERATURE
TEMPERATURE (°C)
PHASE (degrees)
MAX4624TOC5
2.5
2.0
1.5
1.0
LOGIC THRESHOLD VOLTAGE (V)
0.5
0
24356
3.3V
0
CHARGE INJECTION vs. COM VOLTAGE
100
50
0
-50
Q (pC)
-100
-150
-200
021 345
V
COM
MAX4625
MAX4624
(V)
LOGIC THRESHOLD VOLTAGE
vs. SUPPLY VOLTAGE
MAX4624 toc08
VIN RISING
VIN FALLING
SUPPLY VOLTAGE (V)
OVERCURRENT RESPONSE
MAX4624 toc10
V
COM
2V/div
MAX4624 toc06
0.01
THD (%)
0.001
10 100 1k 10k 100k
FRQUENCY (Hz)
1.5A
I
COM
0
1ms/div
1A/div
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 (t
ON
= 50ns
max, t
OFF
= 50ns max).
When powered from a +5V supply, their 1Ω max R
ON
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.
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 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 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 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
Analog Switch—CommonCOM5
Analog Switch—Normally OpenNO6
Analog Switch—Normally ClosedNC4
GroundGND3
PIN
Positive Supply Voltage InputV+2
Digital Control InputIN
1
FUNCTIONNAME
Figure 1. Overvoltage Protection Using Two External Blocking
Diodes
Rail-to-Rail is a registered trademark of Nippon Motorola, Ltd.
POSITIVE SUPPLY
D1
V+
NO
V
g
GND
COM
D2
MAX4624
MAX4625
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
1Ω, Low-Voltage, Single-Supply
SPDT Analog Switches
_______________________________________________________________________________________ 7
Figure 2. Switching Time
Test Circuits/Timing Diagrams
Figure 3a. Break-Before-Make Interval (MAX4624 only)
MAX4624
MAX4625
LOGIC
INPUT
NO
V
IN_
OR NC
IN
GND
V+
V+
COM
R
L
50Ω
V
INH
C
L
35pF
LOGIC
INPUT
V
V
OUT
SWITCH
OUTPUT
INL
0V
V
50%
OUT
t
ON
0.9 · V
0UT
t
OFF
tr < 5ns
tf < 5ns
0.9 · V
OUT
C
INCLUDES FIXTURE AND STRAY CAPACITANCE.
L
R
N_ (
L
)
ON
V
= V
OUT
RL + R
MAX4624
V
LOGIC
INPUT
N_
NC
NO
IN
C
INCLUDES FIXTURE AND STRAY CAPACITANCE.
L
V+
V+
COM
R
50Ω
GND
LOGIC INPUT WAVEFORMS INVERTED FOR SWITCHES
THAT HAVE THE OPPOSITE LOGIC SENSE.
V
INH
LOGIC
INPUT
V
V
OUT
L
C
L
35pF
INL
V
OUT
50%
0.9 · V
OUT
t
D
MAX4624/MAX4625
1Ω, Low-Voltage, Single-Supply
SPDT Analog Switches
8 _______________________________________________________________________________________
Figure 3b. Make-Before-Break Interval (MAX4625 only)
Figure 4. Charge Injection
Figure 5. On-Loss, Off-Isolation, and Crosstalk
Test Circuits/Timing Diagrams (continued)
MAX4625
V+
V+
NC
V
LOGIC
INPUT
COM
GND
C
INCLUDES FIXTURE AND STRAY CAPACITANCE.
L
NO
50Ω
R
L
MAX4624
MAX4625
R
GEN
NC
OR NO
V
GEN
GND
V+
V+
COM
IN
TO V
V
INL
INH
V
NO
C
L
35pF
V
INH
LOGIC
INPUT
V
INL
V
NC
R
L
C
50Ω
V
OUT
C
L
L
35pF
V
OUT
IN
IN
V
NC
0.8 • V
OUT
V
NQ
OFF
OFF
IN DEPENDS ON SWITCH CONFIGURATION;
INPUT POLARITY DETERMINED BY SENSE OF SWITCH.
Q = (∆V
ON
ON
)(CL)
OUT
0.8
•
V
OUT
t
MBB
V
∆
OUT
OFF
OFF
10nF
+5V
OFF-ISOLATION = 20log
ON-LOSS = 20log
CROSSTALK = 20log
0V OR V+
50Ω
IN
NC
V+
MAX4624
MAX4625
GND
COM
NO
NETWORK
ANALYZER
V
IN
V
OUT
50Ω
MEAS REF
50Ω
50Ω 50Ω
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.
V
OUT
V
IN
V
OUT
V
IN
V
OUT
V
IN
MAX4624/MAX4625
1Ω, Low-Voltage, Single-Supply
SPDT Analog Switches
_______________________________________________________________________________________ 9
Figure 6. Channel Off/On-Capacitance
TRANSISTOR COUNT: 186
Chip Information
V+
10nF
V+
COM
CAPACITANCE
METER
f = 1MHz
NC or
NO
GND
MAX4624
MAX4625
IN
V
INL
OR
V
INH
MAX4624/MAX4625
1Ω, Low-Voltage, Single-Supply
SPDT Analog Switches
10 ______________________________________________________________________________________
Package Information
6LSOT.EPS
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.
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