ISL84780IR Intersil, ISL84780IR Datasheet - Page 6

• Manufacturer Part Number: ISL84780IR
• Description: IC SWITCH QUAD SPDT 16TQFN
• Manufacturer: Intersil

Specifications of ISL84780IR

• Function: Switch
• Circuit: 4 x SPDT
• On-state Resistance: 600 mOhm
• Voltage Supply Source: Single Supply
• Voltage - Supply, Single/dual (±): 1.65 V ~ 3.6 V
• Current - Supply: .05µA
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 16-WFQFN Exposed Pad
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

Test Circuits and Waveforms
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 (0.36Ω) and high speed operation (t
t
battery-powered equipment due to its low operating supply
voltage (1.6V), low power consumption (5.4µW 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
OFF
SIGNAL
GENERATOR
ANALYZER
SIGNAL
GENERATOR
ANALYZER
= 8ns). The device is especially well suited for portable
FIGURE 4. OFF ISOLATION TEST CIRCUIT
FIGURE 6. CROSSTALK TEST CIRCUIT
R
0V or V+
L
R
L
NO or NC
COM
IN
NO or NC
COM
1
6
GND
GND
NC or NO
COM
V+
V+
(Continued)
IN
C
C
ON
0V or V+
= 12ns,
50Ω
N.C.
ISL84780
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 1kΩ 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 R
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.
V
IMPEDANCE
NX
ANALYZER
R
ON
FIGURE 7. CAPACITANCE TEST CIRCUIT
1mA
= V
1
FIGURE 5. R
/1mA
V
1
ON
COM
NO or NC
ON
switch, so two small signal
TEST CIRCUIT
NO or NC
COM
GND
GND
V+
IN
V+
IN
C
December 27, 2004
0V or V+
0V or V+
C
FN6099.1