9 Application and Implementation

Note

Information in the following applications sections is not part of the TI component specification, and TI

does not warrant its accuracy or completeness. TI’s customers are responsible for determining

suitability of components for their purposes. Customers should validate and test their design

implementation to confirm system functionality.

9.1 Application Information

The TMUX621x is part of the precision switches and multiplexers family of devices. These devices operate with

dual supplies (±4.5 V to ±18 V), a single supply (4.5 V to 36 V), or asymmetric supplies (such as VDD = 12 V,

VSS = –5 V), and offer true rail-to-rail input and output.The TMUX621x offers low RON, low on and off leakage

currents and ultra-low charge injection performance. These features makes the TMUX621x a family of precision,

robust, high-performance analog multiplexer for high-voltage, industrial applications.

9.2 Typical Application

One example to take advantage of TMUX621x precision performance is the implementation of parametric

measurement unit (PMU) in the semiconductor automatic test equipment (ATE) application.

In Automated Test Equipment (ATE) systems, the Parametric Measurement Unit (PMU) is tasked to measure

device (DUT) parametric information in terms of voltage and current. When measuring voltage, current is applied

at the DUT pin, and current range adjustment can be done through changing the value of the internal sense

resistor. There is sometimes a need, depending on the DUT, to use even higher testing current than natively

supported by the system. A 4 channel SPST switch, together with external higher current amplifier and resistor,

can be used to achieve the flexibility. The PMU operating voltage is typically in mid voltage (up tp 20 V). An

appropriate switch like the TMUX621x with low leakage current (0.05 nA typical) works well in these applications

more precisely. Figure 9-1 shows simplified diagram of such implementations in memory and semiconductor test

equipment.

DAC

+

±

ADC

+

±

Force

Amplifier

Measure

Voltage

Amplifier

Measure

Current

Amplifier

DUT

High

Current

Amplifier

EN

+

±

Internal Sense Resistor

DAC

+

±

+

±

ADC

+

±

Force

Amplifier

Measure

Voltage

Amplifier

Measure

Current

Amplifier

DUT

High

Current

Amplifier

EN

External Sense Resistor

Figure 9-1. High Current Range Selection Using External Resistor

TMUX6211, TMUX6212, TMUX6213

SCDS431 – OCTOBER 2020

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