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ISL84780 Datasheet(PDF) 6 Page - Intersil Corporation

Part No. ISL84780
Description  Ultra Low ON-Resistance, Low Voltage, Single Supply, Quad 2:1 Analog Multiplexer
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Manufacturer  INTERSIL [Intersil Corporation]
Direct Link  http://www.intersil.com/cda/home
Logo INTERSIL - Intersil Corporation

ISL84780 Datasheet(HTML) 6 Page - Intersil Corporation

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6
FN6099.1
December 27, 2004
Detailed Description
The ISL84780 is a bidirectional, quad single pole/double
throw (SPDT) analog switch that offers precise switching
capability from a single 1.6V to 3.6V supply with low on-
resistance (0.36
Ω) and high speed operation (tON = 12ns,
tOFF = 8ns). The device is especially well suited for portable
battery-powered equipment due to its low operating supply
voltage (1.6V), low power consumption (5.4
µW max), low
leakage currents (30nA max), and the tiny TQFN and TSSOP
packages. The ultra low on-resistance and Ron flatness
provide very low insertion loss and distortion to applications
that require signal reproduction.
Supply Sequencing and Overvoltage Protection
With any CMOS device, proper power supply sequencing is
required to protect the device from excessive input currents
which might permanently damage the IC. All I/O pins contain
ESD protection diodes from the pin to V+ and to GND (see
Figure 8). To prevent forward biasing these diodes, V+ must
be applied before any input signals, and the input signal
voltages must remain between V+ and GND. If these
conditions cannot be guaranteed, then one of the following
two protection methods should be employed.
Logic inputs can easily be protected by adding a 1k
Ω resistor
in series with the input (See Figure 8). The resistor limits the
input current below the threshold that produces permanent
damage, and the sub-microamp input current produces an
insignificant voltage drop during normal operation.
This method is not acceptable for the signal path inputs.
Adding a series resistor to the switch input defeats the
purpose of using a low RON switch, so two small signal
diodes can be added in series with the supply pins to provide
overvoltage protection for all pins (See Figure 8). These
additional diodes limit the analog signal from 1V below V+ to
1V above GND. The low leakage current performance is
unaffected by this approach, but the switch signal range is
reduced and the resistance may increase, especially at low
supply voltages.
FIGURE 4. OFF ISOLATION TEST CIRCUIT
FIGURE 5. RON TEST CIRCUIT
FIGURE 6. CROSSTALK TEST CIRCUIT
FIGURE 7. CAPACITANCE TEST CIRCUIT
Test Circuits and Waveforms (Continued)
ANALYZER
RL
SIGNAL
GENERATOR
V+
C
0V or V+
NO or NC
COM
IN
GND
V+
C
0V or V+
NO or NC
COM
IN
GND
VNX
V1
RON = V1/1mA
1mA
0V or V+
ANALYZER
V+
C
NO or NC
SIGNAL
GENERATOR
RL
GND
IN1
COM
50
N.C.
COM
NC or NO
V+
C
GND
NO or NC
COM
IN
IMPEDANCE
ANALYZER
0V or V+
ISL84780


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