7 Parameter Measurement Information

7.1 On-Resistance

The on-resistance of a device is the ohmic resistance between the source (Sx) and drain (D) pins of the

device. The on-resistance varies with input voltage and supply voltage. The symbol RON is used to denote

on-resistance. Figure 7-1 shows the measurement setup used to measure RON. Voltage (V) and current (ISD) are

measured using the following setup, where RON is computed as RON = V / ISD:

V

Dx

V

S

I

SD

Sx

RON

Figure 7-1. On-Resistance

7.2 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 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 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).

Figure 7-2 shows the setup used to measure both off-leakage currents.

S1

GND

VS

D1

VD

A

Is (OFF)

VDD

VSS

IS(OFF)

VS

VD

ID(OFF)

ID (OFF)

A

S2

VS

A

Is (OFF)

D2

VD

ID (OFF)

A

VS

VD

S1

GND

D1

VDD

VSS

S2

D2

Figure 7-2. Off-Leakage Measurement Setup

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TMUX7221, TMUX7222

SCDS444A – FEBRUARY 2023 – REVISED SEPTEMBER 2023

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