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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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TC3405 датащи(PDF) 10 Page - Microchip Technology |
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TC3405 датащи(HTML) 10 Page - Microchip Technology |
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10 / 16 page  TC3405 DS21414B-page 10 © 2002 Microchip Technology Inc. 3.3 VDD Monitor The TC3405 RESET output is in high impedance provided the voltage at VTH is greater than the internal voltage reference. This reference is approximately the same value as the voltage appearing at REFOUT.When VTH is less than the internal reference, RESET is pulled low. When VTH rises above the internal reference voltage again, RESET is held low for the reset active time-out period, t9, before being released. The RESET output is valid for VDD =1.3V to 5.5V. When used to generate a Power-on or Brown-out Reset, an external resistor network is required to divide the appropriate VDD threshold down to 1.23V at the VTH input, (See the Typical Application circuit). For example, to generate a POR for a VDD at 3V -10%, the values of R1 and R2 should be 137k Ω and 115kΩ respectively. Since RESET is an open drain, it can be wired-OR’ed with another open drain or external switch if desired. |
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