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M27C4001-15C6X Folha de dados(PDF) 6 Page - STMicroelectronics |
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M27C4001-15C6X Folha de dados(HTML) 6 Page - STMicroelectronics |
6 / 17 page M27C4001 6/17 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 capacitive and inductive loading of the device at the output. The associated transient voltage peaks can be suppressed by complying with the two line output control and by properly selected decoupling capacitors. It is recommended that a 0.1 µF 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 4.7 µF 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. Figure 5. Read Mode AC Waveforms AI00724B tAXQX tEHQZ A0-A18 E G Q0-Q7 tAVQV tGHQZ tGLQV tELQV VALID Hi-Z VALID Table 8B. Read Mode AC Characteristics (1) (TA = 0 to 70 °C or –40 to 85 °C; VCC = 5V ± 5% or 5V ± 10%; VPP = VCC) Note: 1. VCC must be applied simultaneously with or before VPP and removed simultaneously or after VPP. 2. Sampled only, not 100% tested. Symbol Alt Parameter Test Condition M27C4001 Unit -70 -80/-90 -10/-12/-15 Min Max Min Max Min Max tAVQV tACC Address Valid to Output Valid E = VIL, G = VIL 70 80 100 ns tELQV tCE Chip Enable Low to Output Valid G = VIL 70 80 100 ns tGLQV tOE Output Enable Low to Output Valid E = VIL 35 40 50 ns tEHQZ (2) tDF Chip Enable High to Output Hi-Z G = VIL 030 0 300 30 ns tGHQZ (2) tDF Output Enable High to Output Hi-Z E = VIL 030 0 300 30 ns tAXQX tOH Address Transition to Output Transition E = VIL, G = VIL 000 ns |
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