General Description
The MAX4554/MAX4555/MAX4556 are CMOS analog ICs configured as force-sense switches for Kelvin sensing in automated test equipment (ATE). Each part contains high-current, low-resistance switches for forcing current, and higher resistance switches for sensing a voltage or switching guard signals. The MAX4554 contains two force switches, two sense switches, and two guard switches configured as two triple-pole/single-throw (3PST) normally open (NO) switches. The MAX4555 contains four independent single-pole/single-throw (SPST) normally closed (NC) switches, two force switches, and two sense switches. The MAX4556 contains three independent single-pole/double-throw (SPDT) switches, of which one is a force switch and two are sense switches. These devices operate from a single supply of +9V to +40V or dual supplies of ±4.5V to ±20V. On-resistance (6Ω max) is matched between switches to 1Ω max.
Each switch can handle Rail-to-Rail® analog signals. The off-leakage current is only 0.25nA at +25°C and 2.5nA at +85°C. The MAX4554 is also fully specified for +20V and -10V operation.
All digital inputs have +0.8V and +2.4V logic thresholds, ensuring both TTL- and CMOS-logic compatibility.

Features
♦ 6Ω Force Signal Paths (±15V Supplies)
   1Ω Force Signal Matching (±15V Supplies)
♦ 60Ω Sense-Guard Signal Paths (±15V Supplies)
   8Ω Sense-Guard Signal Matching (±15V Supplies)
♦ Rail-to-Rail Signal Handling
♦ Break-Before-Make Switching (MAX4556)
♦ tON and tOFF = 275ns (±15V Supplies)
♦ Low 1µA Power Consumption
♦ >2kV ESD Protection per Method 3015.7
♦ TTL/CMOS-Compatible Inputs

Applications
   Automated Test Equipment (ATE)
   Calibrators
   Precision Power Supplies
   Automatic Calibration Circuits
   Asymmetric Digital Subscriber Line (ADSL) with Loopback