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M27C800-90XF1TR Datasheet(PDF) 7 Page - STMicroelectronics |
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M27C800-90XF1TR Datasheet(HTML) 7 Page - STMicroelectronics |
7 / 18 page 7/18 M27C800 Figure 5. Word-Wide Read Mode AC Waveforms Note: BYTEVPP =VIH. AI01596B tAXQX tEHQZ A0-A18 E G Q0-Q15 tAVQV tGHQZ tGLQV tELQV VALID Hi-Z VALID Two Line Output Control Because EPROMs are usually used in larger memory arrays, this product features a 2-line con- trol function which accommodates the use of mul- tiple memory connection. The two-line control function allows: a. the lowest possible memory power dissipation b. complete assurance that output bus contention will not occur. For the most efficient use of these two control lines, E should be decoded and used as the prima- ry device selecting function, while G should be made a common connection to all devices in the array and connected to the READ line from the system control bus. This ensures that all deselect- ed memory devices are in their low power standby mode and that the output pins are only active when data is required from a particular memory device. System Considerations The power switching characteristics of Advanced CMOS EPROMs require careful decoupling of the supplies to the devices. The supply current ICC has three segments of importance to the system designer: the standby current, the active current and the transient 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 outputs. The associated transient voltage peaks can be suppressed by complying with the two line output control and by properly se- lected decoupling capacitors. It is recommended that a 0.1µF ceramic capacitor is used on every device between VCC and VSS. This should be a high frequency type of low inher- ent inductance and should be placed as close as possible to the device. In addition, a 4.7µF electro- lytic capacitor should be used between VCC and VSS for every eight devices. This capacitor should be mounted near the power supply connection point. The purpose of this capacitor is to overcome the voltage drop caused by the inductive effects of PCB traces. |
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Similar Description - M27C800-90XF1TR |
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