ISL84581 Intersil Corporation, ISL84581 Datasheet - Page 9

• Manufacturer Part Number: ISL84581
• Description: 8 to 1 Multiplexer
• Manufacturer: Intersil Corporation

Test Circuits and Waveforms
Detailed Description
The ISL84581 multiplexer offers precise switching capability
from bipolar
When powered with dual
resistance (39Ω) and high speed operation (t
t
It has an inhibit pin to simultaneously open all signal paths.
The device is especially well suited for applications using
±5V supplies. With ±5V supplies the performance (R
Leakage, Charge Injection, etc.) is best in class.
High frequency applications also benefit from the wide
bandwidth and high off isolation.
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
OFF
SIGNAL
GENERATOR
ANALYZER
= 19ns).
FIGURE 4. OFF ISOLATION TEST CIRCUIT
±
2V to
R
L
±
6Vsupplies or a single 2V to 12V supply.
±
5V supplies the part has low on-
NOx
COM
9
V+
GND
C
IMPEDANCE
ADDX
ANALYZER
INH
(Continued)
V-
ON
FIGURE 6. CAPACITANCE TEST CIRCUIT
0V or V+
0V or V+
= 38ns,
C
ON
,
ISL84581
COM
NOx
ESD protection diodes from the pin to V+ and to V- (see
Figure 7). To prevent forward biasing these diodes, V+ and
V- must be applied before any input signals, and input signal
voltages must remain between V+ and V-. 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 7). 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 applicable 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 7). These
additional diodes limit the analog signal from 1V below V+ to
V+
V
GND
NOX
C
R
ADDX
INH
ON
1mA
= V
V-
1
FIGURE 5. R
0V or V+
/1mA
C
V
1
ON
COM
NO
ON
switch, so two small signal
TEST CIRCUIT
V+
GND
C
ADDX
INH
V-
0V or V+
C
February 9, 2007
FN6416.0