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M48Z35MH Datasheet(PDF) 10 Page - STMicroelectronics |
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M48Z35MH Datasheet(HTML) 10 Page - STMicroelectronics |
10 / 18 page M48Z35, M48Z35Y 10/18 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 9) is recommended in order to provide the needed 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. Figure 9. Supply Voltage Protection AI02169 VCC 0.1 µF DEVICE VCC VSS |
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