19-1653; Rev 1; 7/00
Fast, Low-Voltage, 2.5Ω, SPST,
CMOS Analog Switches
General Description
____________________________Features
ꢀ +1.8V to +5V Single-Supply Operation
The MAX4645/MAX4646 single-pole, single-throw (SPST)
analog switches feature a 2.5Ω typical on-resistance
ꢀ Guaranteed R
ON
(R ) from a +5V supply. R
is flat (0.4Ω max) over the
ON
ON
2.5Ω max (5V supply)
specified signal range. Each switch can handle Rail-to-
Rail® analog signals. Off-leakage current is 0.25nA max at
+25°C. These analog switches are ideal in low-distortion
applications and are the preferred solution over mechani-
cal relays in automated test equipment or applications
where current switching is required. They have low power
requirements, require less board space, and are more
reliable than mechanical relays.
3.5Ω max (3V supply)
ꢀ 1.8V Operation
R
ON
30Ω typ Over Temperature
ON
t
40ns typ, t
20ns typ
OFF
ꢀ Low R
Flatness: 0.4Ω max
ON
ꢀ Guaranteed Low Leakage Currents
0.25nA at +25°C
ꢀ Rail-to-Rail Output Capability
ꢀ TTL/CMOS-Logic Compatible
ꢀ -75dB Off-Isolation at 1MHz
ꢀ Low Distortion: 0.014% typ
These switches operate from a +1.8V to +5V single sup-
ply, making them ideal for use in battery-powered applica-
tions. The MAX4645/MAX4646 have fast switching speeds
of 12ns turn-on time (t ) and 8ns turn-off time (t
).
ON
OFF
The MAX4645 is a normally open (NO) switch, and the
MAX4646 is a normally closed (NC) switch. Both are
available in 5-pin SOT23, 6-pin SOT23, and 8-pin µMAX
packages.
Ordering Information
PIN-
PACKAGE
TOP
MARK
PART
TEMP. RANGE
________________________Applications
MAX4645EUK-T -40°C to +85°C 5 SOT23-5
ADOB
AAHL
—
Battery-Powered Systems
Audio and Video Signal Routing
Low-Voltage Data-Acquisition Systems
Sample-and-Hold Circuits
Communications Circuits
MAX4645EUT-T
MAX4645EUA
-40°C to +85°C 6 SOT23-6
-40°C to +85°C 8 µMAX
MAX4646EUK-T -40°C to +85°C 5 SOT23-5
ADOC
AAHM
—
MAX4646EUT-T
MAX4646EUA
-40°C to +85°C 6 SOT23-6
-40°C to +85°C 8 µMAX
Relay Replacement
Rail-to-Rail is a registered trademark of Nippon Motorola, Ltd.
Pin Configurations/Functional Diagrams/Truth Tables
TOP VIEW
PIN 5
5
4
COM
NO
1
2
3
V+
IN
5
4
COM
NC
1
2
3
V+
IN
5
4
XYZA
1
2
3
GND
GND
MAX4645
MAX4646
µMAX/SO/DIP
NOTE: SOT23-5 PACKAGE
HAS LETTERING NEAREST PIN 5.
µMAX/SO/DIP
SOT23-5
SOT23-5
SWITCH STATE
INPUT
MAX4645
MAX4646
OFF
ON
ON
OFF
0
1
Pin Configurations/Functional Diagrams/
Truth Tables continued at end of data sheet.
SWITCHES SHOWN FOR LOGIC 0 INPUT.
________________________________________________________________ Maxim Integrated Products
1
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