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ISL21440IUZ Datasheet(PDF) 11 Page - Intersil Corporation |
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ISL21440IUZ Datasheet(HTML) 11 Page - Intersil Corporation |
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11 / 15 page  11 FN6532.1 March 2, 2010 Functional Description Device Power The ISL21440 device has a single positive supply pin, V+, and two other supply pins, V- and GND. Normally for single supply applications the V- pin is tied to system ground as well as the GND pin. The separate ground pin allows the comparator to be powered by split supplies from ±1.0V to ±5.5V. Note that the minimum supply voltage will be 0.8V above the comparator maximum input level for accurate operation. Comparator Section The comparator inputs can swing from the negative supply (GND pin) to within 0.8V of the positive supply (V+). Alternatively, with the comparator input set at the 1.182V reference level, the minimum input voltage for accurate operation is 2.0V. If the inputs are expected to see voltage levels above V+ or below ground, they should be clamped with low leakage Schottky diodes. The CMOS output swings essentially from the GND potential to V+ potential, depending on load current. If loads in excess of 1mA are expected, then a 0.1µF decoupling capacitor at the V+ pin should be added. Voltage Reference Section The voltage reference is a micropower FGA reference and is set to 1.182V ±0.5% at the factory. The reference output can source up to 2mA but the sink capability is very limited at only 10µA, maximum. Small value capacitors, up to 10nF, can be used on the reference output to lower noise if desired. Applications Information Handling and Board Mounting FGA references provide excellent initial accuracy and low temperature drift at the expense of very little power drain. There are some precautions to take to insure this accuracy is not compromised. Excessive heat during solder reflow can cause excessive initial accuracy drift, so the recommended +260°C max FIGURE 21. OUTPUT RESPONSE TIME vs INPUT OVERDRIVE (tPLH) FIGURE 22. POWER-UP/DOWN OUTPUT RESPONSE (V+ = 5V, IN+ = V+, IN- = VREF) FIGURE 23. POWER-UP/DOWN OUTPUT RESPONSE (V+ = 3V, IN+ = V+, IN- = VREF) Typical Performance Curves (Continued) 20 45 70 95 120 145 170 195 220 245 270 10 20 30 40 50 60 70 80 90 100 110 120 INPUT VOLTAGE (mV) 3V 5V -0.5 0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 TIME (ms) V+ OUT -0.5 0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 V+ OUT TIME (ms) ISL21440 |
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