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ISL84517IB-T Datasheet(PDF) 5 Page - Intersil Corporation |
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ISL84517IB-T Datasheet(HTML) 5 Page - Intersil Corporation |
5 / 10 page 5 Detailed Description The ISL84516 and ISL84517 analog switches offer precise switching capability from ±1.5V to ±6V supplies with low on- resistance (13 Ω) and high speed operation (tON = 40ns, tOFF = 30ns). The devices are especially well suited to portable battery powered equipment thanks to the low operating supply voltage ( ±1.5V), low power consumption (350 µW), low leakage currents (2nA max), and the tiny SOT-23 packaging. High frequency applications also benefit from the wide bandwidth, and the very 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 ESD protection diodes from the pin to V+ and to V- (see Figure 6). 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 1k Ω resistor in series with the input (see Figure 6). 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. 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 6). These additional diodes limit the analog signal from 1V below V+ to 1V above V-. The low leakage current performance is Test Circuits and Waveforms (Continued) ANALYZER RL SIGNAL GENERATOR V+ C V- or V+ NO or NC COM IN V- C FIGURE 3. OFF ISOLATION TEST CIRCUIT V+ C VINL or VINH NO or NC COM IN VCOM V1 RON = V1/1mA 1mA V- C FIGURE 4. RON TEST CIRCUIT V+ NO or NC COM IN IMPEDANCE ANALYZER V- or V+ V- FIGURE 5. CAPACITANCE TEST CIRCUIT ISL84516, ISL84517 |
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