D

VS

VD

A

A

ID (OFF)

Is (OFF)

S

V

D

VS

ICH

S

16

MUX508, MUX509

SBAS758C – JANUARY 2016 – REVISED SEPTEMBER 2016

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Copyright © 2016, Texas Instruments Incorporated

8.2 On-Resistance

The on-resistance of the MUX50x is the ohmic resistance across the source (Sx, SxA, or SxB) and drain (D, DA,

or DB) pins of the device. The on-resistance varies with input voltage and supply voltage. The symbol RON is

used to denote on-resistance. The measurement setup used to measure RON is shown in Figure 26. Voltage (V)

and current (ICH) are measured using this setup, and RON is computed as shown in Equation 1.

Figure 26. On-Resistance Measurement Setup

RON = V / ICH

(1)

8.3 Off-Leakage Current

There are two types of leakage currents associated with a switch during the off state:

1. Source off-leakage current

2. Drain off-leakage current

Source off-leakage current is defined as the leakage current flowing into or out of the source pin when the switch

is off. This current is denoted by the symbol IS(OFF).

Drain off-leakage current is defined as the leakage current flowing into or out of the drain pin when the switch is

off. This current is denoted by the symbol ID(OFF).

The setup used to measure both types of off-leakage currents is shown in Figure 27.

Figure 27. Off-Leakage Measurement Setup