19-1977; Rev 3; 2/03
0.5Ω/0.8Ω Low-Voltage, Dual SPDT
Analog Switches in UCSP
General Description
Features
✕ 12-Bump, 0.5mm-Pitch UCSP
The MAX4684/MAX4685 low on-resistance (R ), low-
ON
✕ NC Switch R
voltage, dual single-pole/double-throw (SPDT) analog
switches operate from a single +1.8V to +5.5V supply.
ON
0.5Ω max (+2.7V Supply) (MAX4684)
0.8Ω max (+2.7V Supply) (MAX4685)
The MAX4684 features a 0.5Ω (max) R
for its NC
ON
✕ NO Switch R
ON
switch and a 0.8Ω (max) R
for its NO switch at a
ON
0.8Ω max (+2.7V Supply)
+2.7V supply. The MAX4685 features a 0.8Ω max on-
resistance for both NO and NC switches at a +2.7V
supply.
✕ R
✕ R
Match Between Channels
0.06Ω (max)
Flatness Over Signal Range
ON
ON
Both parts feature break-before-make switching action
0.15Ω (max)
(2ns) with t
= 50ns and t
= 40ns at +3V. The digi-
ON
OFF
✕ +1.8V to +5.5V Single-Supply Operation
✕ Rail-to-Rail® Signal Handling
✕ 1.8V Logic Compatibility
tal logic inputs are 1.8V logic-compatible with a +2.7V to
+3.3V supply.
The MAX4684/MAX4685 are packaged in the chipscale
package (UCSP)™, significantly reducing the required
✕ Low Crosstalk: -68dB (100kHz)
✕ High Off-Isolation: -64dB (100kHz)
✕ THD: 0.03%
✕
PC board area. The chip occupies only a 2.0mm
✕
1.50mm area. The 4 3 array of solder bumps are
✕ 50nA (max) Supply Current
✕ Low Leakage Currents
spaced with a 0.5mm bump pitch.
1nA (max) at T = +25°C
A
Ordering Information
________________________Applications
Speaker Headset Switching
PIN/BUMP-
PACKAGE
TOP
MARK
PART
TEMP RANGE
-40°C to +85°C
-40°C to +85°C
MP3 Players
MAX4684EBC
MAX4684ETB
12 UCSP*
AAF
Power Routing
10 Thin QFN
(3 ✕ 3)
Battery-Operated Equipment
Relay Replacement
Audio and Video Signal Routing
Communications Circuits
PCMCIA Cards
AAG
MAX4684EUB
-40°C to +85°C
-40°C to +85°C
10 µMAX
12 UCSP*
—
MAX4685EBC
AAG
10 Thin QFN
(3 ✕ 3)
MAX4685ETB
MAX4685EUB
-40°C to +85°C
-40°C to +85°C
AAH
—
10 µMAX
Cellular Phones
Modems
Note: Requires special solder temperature profile describing
the Absolute Maximum Ratings section.
UCSP is a trademark of Maxim Integrated Products, Inc.
Rail-to-Rail is a registered trademark of Nippon Motorola, Ltd.
*UCSP reliability is integrally linked to the user’s assembly
methods, circuit board material, and environment. Refer to the
UCSP Reliability Notice in the UCSP Reliability section of this
data sheet for more information.
Pin Configurations/Functional Diagrams/Truth Table
TOP VIEW
MAX4684/MAX4685
MAX4684/MAX4685
GND
C1
C2
B1
A1
A2
NC1
IN1
NC2
IN2
1
2
3
4
5
10 NO2
V+
NO1
9
COM2
MAX4684/MAX4685
IN2
8
7
COM1
IN1
IN_
0
NO_
OFF
ON
NC_
ON
COM1 C3
A3 COM2
NC2
GND
NO1
C4
NO2
A4
1
OFF
B4
NC1
6
SWITCHES SHOWN FOR LOGIC "0" INPUT
V+
Continued at end of data sheet.
µMAX
UCSP
________________________________________________________________ Maxim Integrated Products
1
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.