Many integrated circuits such microprocessors DSPs need operate very v

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AND8139/D Ultra-Low Voltage MiniGatet Devices Solve Interface Problems
Many integrated circuits such microprocessors DSPs need operate very voltage order conserve power over dissipate. Issues arise when designer device, like DSP, operating needs interface with other semiconductors operating more. When performing interface between voltage between single answer that solves problems, simply with minimum board space, NL17SVyyyXV5T2 family. With available devices, signal applied input brought fastest possible time (minimum delay), while occupying minimum board space consuming minimum power. designer might simply resistors perform voltage division? Resistors certainly used some applications they consume power limit operating frequency create delay (when designer includes input device). Figure illustrates resistors limit voltage DSP. simplicity, this article will take into account tolerance issues. That will left reader chooses this approach. cases, will MHz, resistors
used, circuit will perform required voltage division. loading will draw when device assumed duty cycle, then power consumption simple resistor divider will This power consumption high that would ruled immediately. would have used larger value resistors, frequency response would impaired would impossible. delay time through this circuit will about second possible scheme might transistor. transistor were used, would need voltage division scheme similar Figure values would need same order keep frequency response f3dB. Power dissipation would actually higher than passive case because would have third resistor from collector (Figure would have another power dissipation output resistor. This solution would consume power again outrageously high power budget. addition, manufacturer would have place three parts (three resistors transistor plus resistor). Delay time would longer than passive solution above, hence more costly would present absolutely advantage over simple resistive divider.
Figure
Figure
Semiconductor Components Industries, LLC, 2003
December, 2003 Rev.
Publication Order Number: AND8139/D
AND8139/D
should noticed that signal inverted case transistor. This desirable. fact, phase inversion would only plausible reason prefer transistor case over passive resistor divider. last option that will presented will Semiconductor sub-one volt family, NL17SVxx products. have choice inverted non-inverted output. Since devices Over-Voltage Tolerant (OVT) their inputs, designer simply apply signal input device. this application, Figure shows supply voltage device will This assures that output will logic level compatible with device that driving.
Since logic only driving capacitive input, there very little power dissipation input. calculate total power consumed, must different equation that depends Power Dissipation Capacitance (CPD) main factor. calculate power loss gate, following formula used:
(CPD VCC2 (ICC VCC)
equation works total power, with about power consumed leakage current switching. delay time only (worst case),
Conclusion
NL17SV16XV5T2
Figure
single gate logic level translation saves power required passive solution even more compared transistor solution. manufacturer needs only place part versus more other approach. time delay much faster less circuit dependent. Output either inverted non-inverted selecting appropriate single gate device). circuit will easily operate past MHz, needed clear that this only practical solution logic level translation power.
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AND8139/D

Many integrated circuits such microprocessors DSPs need operate very v

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