19-1653; Rev 1; 7/00
Fast, Low-Voltage, 2.5Ω, SPST,
CMOS Analog Switches
General Description
The MAX4645/MAX4646 single-pole, single-throw (SPST)
analog switches feature a 2.5Ω typical on-resistance
(R
ON
) from a +5V supply. R
ON
is flat (0.4Ω max) over the
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.
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
ON
) and 8ns turn-off time (t
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.
____________________________Features
o
+1.8V to +5V Single-Supply Operation
o
Guaranteed R
ON
2.5Ω max (5V supply)
3.5Ω max (3V supply)
o
1.8V Operation
R
ON
30Ω typ Over Temperature
t
ON
40ns typ, t
OFF
20ns typ
o
Low R
ON
Flatness: 0.4Ω max
o
Guaranteed Low Leakage Currents
±0.25nA at +25°C
o
Rail-to-Rail Output Capability
o
TTL/CMOS-Logic Compatible
o
-75dB Off-Isolation at 1MHz
o
Low Distortion: 0.014% typ
MAX4645/MAX4646
Ordering Information
PART
MAX4645EUK-T
MAX4645EUT-T
MAX4645EUA
MAX4646EUK-T
MAX4646EUT-T
MAX4646EUA
TEMP. RANGE
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
PIN-
PACKAGE
5 SOT23-5
6 SOT23-6
8 µMAX
5 SOT23-5
6 SOT23-6
8 µMAX
TOP
MARK
ADOB
AAHL
—
ADOC
AAHM
—
________________________Applications
Battery-Powered Systems
Audio and Video Signal Routing
Low-Voltage Data-Acquisition Systems
Sample-and-Hold Circuits
Communications Circuits
Relay Replacement
Rail-to-Rail is a registered trademark of Nippon Motorola, Ltd.
Pin Configurations/Functional Diagrams/Truth Tables
TOP VIEW
PIN 5
COM
1
5
V+
COM
1
5
V+
5
XYZA
4
NO
2
NC
2
1
2
3
GND
3
4
IN
MAX4645
µMAX/SO/DIP
GND
3
4
IN
MAX4646
µMAX/SO/DIP
SOT23-5
INPUT
0
1
NOTE: SOT23-5 PACKAGE
HAS LETTERING NEAREST PIN 5.
SOT23-5
SWITCH STATE
MAX4646
MAX4645
ON
OFF
OFF
ON
Pin Configurations/Functional Diagrams/
Truth Tables continued at end of data sheet.
SWITCHES SHOWN FOR LOGIC 0 INPUT.
________________________________________________________________
Maxim Integrated Products
1
For free samples and the latest literature, visit www.maxim-ic.com or phone 1-800-998-8800.
For small orders, phone 1-800-835-8769.
MAXIM [ MAXIM INTEGRATED PRODUCTS ]
