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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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M48T59PC датащи(PDF) 15 Page - STMicroelectronics |
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M48T59PC датащи(HTML) 15 Page - STMicroelectronics |
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15 / 21 page  15/21 M48T59, M48T59Y, M48T59V Figure 13. Supply Voltage Protection AI02169 VCC 0.1 µF DEVICE VCC VSS POWER SUPPLY DECOUPLING and UNDERSHOOT PROTECTION ICC transients, including those produced by output switching, can produce voltage fluctuations, re- sulting in spikes on the VCC bus. These transients can be reduced if capacitors are used to store en- ergy, which stabilizes the VCC bus. The energy stored in the bypass capacitors will be released as low going spikes are generated or energy will be absorbed when overshoots occur. A ceramic by- pass capacitor value of 0.1µF (as shown in Figure 13) is recommended in order to provide the need- ed filtering. In addition to transients that are caused by normal SRAM operation, power cycling can generate neg- ative voltage spikes on VCC that drive it to values below VSS by as much as one Volt. These nega- tive spikes can cause data corruption in the SRAM while in battery backup mode. To protect from these voltage spikes, it is recommended to con- nect a schottky diode from VCC to VSS (cathode connected to VCC, anode to VSS). Schottky diode 1N5817 is recommended for through hole and MBRS120T3 is recommended for surface mount |
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