ISL43L220IRZ Intersil, ISL43L220IRZ Datasheet - Page 8

• Manufacturer Part Number: ISL43L220IRZ
• Description: IC SWITCH DUAL SPDT 10TDFN
• Manufacturer: Intersil

Specifications of ISL43L220IRZ

• Function: Switch
• Circuit: 2 x SPDT
• On-state Resistance: 350 mOhm
• Voltage Supply Source: Single Supply
• Voltage - Supply, Single/dual (±): 1.1 V ~ 4.5 V
• Current - Supply: 0.06µA
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 10-TDFN Exposed Pad
• Rohs Compliant: YES
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: ISL43L220IRZCT; ISL43L220IRZCT

Test Circuits and Waveforms
Detailed Description
The ISL43L220 is a bidirectional, dual single pole/double
throw (SPDT) analog switch that offers precise switching
capability from a single 1.1V to 4.5V supply with low on-
resistance (0.22Ω) and high speed operation (t
t
battery powered equipment due to its low operating supply
voltage (1.1V), low power consumption (4.5µW max), low
leakage currents (110nA max), and the tiny DFN package.
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 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
Signal direction through switch is reversed, worst case values
are recorded. Repeat test for all switches.
OFF
SIGNAL
GENERATOR
ANALYZER
= 5ns). The device is especially well suited for portable
FIGURE 6. CROSSTALK TEST CIRCUIT
R
0V or V+
L
ON
NO or NC
COM
IN
1
switch, so two small signal
8
GND
NC or NO
COM
V+
(Continued)
C
ON
= 11ns,
50Ω
N.C.
ISL43L220
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.
Power-Supply Considerations
The ISL43L220 construction is typical of most single supply
CMOS analog switches, in that they have two supply pins:
V+ and GND. V+ and GND drive the internal CMOS
switches and set their analog voltage limits. Unlike switches
with a 4V maximum supply voltage, the ISL43L220 4.7V
maximum supply voltage provides plenty of room for the
10% tolerance of 4.3V supplies, as well as room for
overshoot and noise spikes.
The minimum recommended supply voltage is 1.1V. It is
important to note that the input signal range, switching times,
and on-resistance degrade at lower supply voltages. Refer
Repeat test for all switches.
IMPEDANCE
ANALYZER
OPTIONAL
PROTECTION
RESISTOR
FIGURE 7. CAPACITANCE TEST CIRCUIT
FIGURE 8. OVERVOLTAGE PROTECTION
IN
V
NO or NC
X
NO or NC
COM
GND
V+
GND
OPTIONAL PROTECTION
DIODE
OPTIONAL PROTECTION
DIODE
V+
IN
V
COM
0V or V+
C
April 12, 2005
FN6093.2