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M27C4002-70XC1X 데이터시트(PDF) 7 Page - STMicroelectronics |
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M27C4002-70XC1X 데이터시트(HTML) 7 Page - STMicroelectronics |
7 / 18 page 7/18 M27C4002 Figure 5. Read Mode AC Waveforms AI00731B tAXQX tEHQZ A0-A17 E G Q0-Q15 tAVQV tGHQZ tGLQV tELQV VALID Hi-Z VALID System Considerations The power switching characteristics of Advanced CMOS EPROMs require careful decoupling of the devices. The supply current, ICC, has three seg- ments that are of interest to the system designer: the standby current level, the active current level, and transient current peaks that are produced by the falling and rising edges of E. The magnitude of the transient current peaks is dependent on the output capacitive and inductive loading of the de- vice. The associated transient voltage peaks can be suppressed by complying with the two line out- put control and by properly selected decoupling capacitors. It is recommended that a 0.1µF ceram- ic capacitor be used on every device between VCC and VSS. This should be a high frequency capaci- tor of low inherent inductance and should be placed as close to the device as possible. In addi- tion, a 4.7µF bulk electrolytic capacitor should be used between VCC and VSS for every eight devic- es. The bulk capacitor should be located near the power supply connection point.The purpose of the bulk capacitor is to overcome the voltage drop caused by the inductive effects of PCB traces. |
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