General Description
The MAX4684/MAX4685 low on-resistance (RON), low voltage, dual single-pole/double-throw (SPDT) analog switches operate from a single +1.8V to +5.5V supply. The MAX4684 features a 0.5Ω (max) RON for its NC switch and a 0.8Ω (max) RON for its NO switch at a +2.7V supply. The MAX4685 features a 0.8Ω max on resistance for both NO and NC switches at a +2.7V supply.
Both parts feature break-before-make switching action (2ns) with tON = 50ns and tOFF = 40ns at +3V. The digital 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 PC board area. The chip occupies only a 2.0mm ✕ 1.50mm area. The 4 ✕ 3 array of solder bumps are spaced with a 0.5mm bump pitch.

FEATUREs
♦ 12-Bump, 0.5mm-Pitch UCSP
♦ NC Switch RON
   0.5Ω max (+2.7V Supply) (MAX4684)
   0.8Ω max (+2.7V Supply) (MAX4685)
♦ NO Switch RON
   0.8Ω max (+2.7V Supply)
♦ RON Match Between Channels
   0.06Ω (max)
♦ RON Flatness Over Signal Range
   0.15Ω (max)
♦ +1.8V to +5.5V Single-Supply Operation
♦ Rail-to-Rail® Signal Handling
♦ 1.8V Logic Compatibility
♦ Low Crosstalk: -68dB (100kHz)
♦ High Off-Isolation: -64dB (100kHz)
♦ THD: 0.03%
♦ 50nA (max) Supply Current
♦ Low Leakage Currents
   1nA (max) at TA = +25°C
  
Applications
   Speaker Headset Switching
   MP3 Players
   Power Routing
   Battery-Operated Equipment
   Relay Replacement
   Audio and Video Signal Routing
   Communications Circuits
   PCMCIA Cards
   Cellular Phones
   Modems