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ISL54052IRUZ-T 数据表(PDF) 7 Page - Intersil Corporation |
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ISL54052IRUZ-T 数据表(HTML) 7 Page - Intersil Corporation |
7 / 12 page 7 FN6459.3 October 19, 2009 Detailed Description The ISL54051 and ISL54052 are bidirectional, single pole/single throw (SPST) analog switches. They offer precise switching capability from a single 1.8V to 5.5V supply with low ON-resistance and high speed operation. With a single supply of 5V the typical ON-resistance is only 0.8Ω, with a typical turn-on and turn-off time of: tON = 24ns, tOFF = 10ns. The devices are especially well suited for portable battery powered equipment due to their low operating supply voltage (1.8V), low power consumption (5.5µW), low leakage currents (300nA max) and tiny µTDFN and SOT-23 packages. The ISL54051 is a single normally open (NO) SPST analog switch. The ISL54052 is a single normally closed (NC) SPST analog switch. 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 6). 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 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. 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 rON switch. Connecting schottky diodes to the signal pins (as shown in Figure 6) will shunt the fault current to the supply or to ground thereby protecting the switch. These schottky diodes must be sized to handle the expected fault current. Power-Supply Considerations The constuction of the ISL54051 and the ISL54052 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 4.5V maximum supply voltage, the ISL54051 and the ISL54052’s 5.5V 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 1.8V but the part will operate with a supply below 1.8V. It is important to note that the input signal range, switching times, and ON-resistance degrade at lower supply voltages. Refer to the “Electrical Specifications” tables starting on page 3 and “Typical Performance Curves” starting on page 8 for details. V+ and GND also power the internal logic and level shiftier. The level shiftier converts the input logic levels to switched V+ and GND signals to drive the analog switch gate terminals. FIGURE 5. CAPACITANCE TEST CIRCUIT Test Circuits and Waveforms (Continued) V+ C GND NO OR NC COM IN IMPEDANCE ANALYZER VINL OR VINH FIGURE 6. OVERVOLTAGE PROTECTION GND VCOM VNX V+ INX OPTIONAL PROTECTION RESISTOR OPTIONAL SCHOTTKY DIODE OPTIONAL SCHOTTKY DIODE ISL54051, ISL54052 |
类似零件编号 - ISL54052IRUZ-T |
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类似说明 - ISL54052IRUZ-T |
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