7

FN6521.1

July 23, 2008

Detailed Description

The ISL84467 is a bidirectional, quad single pole/double

throw (SPDT) analog switch that offers precise switching

capability from a single 1.65V to 4.5V supply with low

ON-resistance (0.39

Ω) and high speed operation (t

battery powered equipment due to its low operating supply

voltage (1.65V), low power consumption (6.3µW max), low

leakage currents (165nA max), and the tiny TQFN package.

insertion loss and distortion to applications that require signal

reproduction.

External V+ Series Resistor

For improved ESD and latch-up immunity, Intersil

recommends adding a 100

Ω resistor in series with the V+

power supply pin of the ISL84467 IC (see Figure 8).

During an overvoltage transient event, such as occurs during

system level IEC 61000 ESD testing, substrate currents can be

generated in the IC that can trigger parasitic SCR structures to

turn ON, creating a low impedance path from the V+ power

supply to ground. This will result in a significant amount of

current flow in the IC which can potentially create a latch-up

state or permanently damage the IC. The external V+

resistor limits the current during this over-stress situation

and has been found to prevent latch-up or destructive

damage for many overvoltage transient events.

Under normal operation, the sub-microamp IDD current of

the IC produces an insignificant voltage drop across the

100

Ω series resistor resulting in no impact to switch

operation or performance.

FIGURE 4. OFF ISOLATION TEST CIRCUIT

FIGURE 6. CROSSTALK TEST CIRCUIT

FIGURE 7. CAPACITANCE TEST CIRCUIT

ANALYZER

SIGNAL

GENERATOR

V+

C

0V or V+

NO or NC

COM

IN

GND

V+

C

IN

GND

100mA

NO or NC

0V or V+

COM

0V or V+

ANALYZER

V+

C

NO or NC

SIGNAL

GENERATOR

GND

50

Ω

NC

COM

COM

NC or NO

V+

C

GND

NO or NC

COM

IN

IMPEDANCE

ANALYZER

0V or V+

ISL84467