전자부품 데이터시트 검색엔진 |
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ISL5122IB 데이터시트(PDF) 9 Page - Intersil Corporation |
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ISL5122IB 데이터시트(HTML) 9 Page - Intersil Corporation |
9 / 15 page 9 FN6022.6 November 17, 2004 Detailed Description The ISL5120–ISL5123 bidirectional, dual analog switches offer precise switching capability from a single 2.7V to 12V supply with low on-resistance (19 Ω) and high speed operation (tON =28ns, tOFF = 20ns). The devices are especially well suited to portable battery powered equipment thanks to the low operating supply voltage (2.7V), low power consumption (5 µW), low leakage currents (100pA max), and the tiny SOT-23 packaging. High frequency applications also benefit from the wide bandwidth, and the very high off isolation and crosstalk rejection. 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 GND (See Figure 8). To prevent forward biasing these diodes, V+ must be applied before any input signals, and 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 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 VINH NO or NC COM INX GND V+ C 0.8V or VINH NO or NC COM IN GND VNX V1 RON = V1/1mA 1mA 0V or 2.4V ANALYZER V+ C NO1 or NC1 SIGNAL GENERATOR RL GND IN1 COM1 IN2 50 Ω 0V or VINH NC COM2 NO2 or NC2 V+ C GND NO or NC COM INX IMPEDANCE ANALYZER 0V or VINH ISL5120, ISL5121, ISL5122, ISL5123 |
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