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X28HC64F-90 Datasheet(PDF) 9 Page - Xicor Inc. |
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X28HC64F-90 Datasheet(HTML) 9 Page - Xicor Inc. |
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9 / 24 page  X28HC64 9 SYSTEM CONSIDERATIONS Because the X28HC64 is frequently used in large memory arrays, it is provided with a two line control architecture for both read and write operations. Proper usage can provide the lowest possible power dissipation and elimi- nate the possibility of contention where multiple I/O pins share the same bus. To gain the most benefit it is recommended that CE be decoded from the address bus and be used as the primary device selection input. Both OE and WE would then be common among all devices in the array. For a read operation, this assures that all deselected devices are in their standby mode and that only the selected device(s) is outputting data on the bus. Because the X28HC64 has two power modes, standby and active, proper decoupling of the memory array is of prime concern. Enabling CE will cause transient current spikes. The magnitude of these spikes is dependent on the output capacitive loading of the I/Os. Therefore, the larger the array sharing a common bus, the larger the transient spikes. The voltage peaks associated with the current transients can be suppressed by the proper selection and placement of decoupling capacitors. As a minimum, it is recommended that a 0.1 µF high fre- quency ceramic capacitor be used between VCC and VSS at each device. Depending on the size of the array, the value of the capacitor may have to be larger. In addition, it is recommended that a 4.7 µF electrolytic bulk capacitor be placed between VCC and VSS for each eight devices employed in the array. This bulk capacitor is employed to overcome the voltage droop caused by the inductive effects of the PC board traces. Normalized ICC(RD) by Temperature Over Frequency Normalized ICC(RD) @ 25% Over the VCC Range and Frequency 1.4 1.2 0.8 0.4 0.6 0.2 1.0 010 20 - 55 °C + 25 °C FREQUENCY (MHz) 3857 FHD F20.1 + 125 °C 5.5 VCC 1.4 1.2 0.8 0.4 0.6 0.2 1.0 010 20 FREQUENCY (MHz) 3857 FHD F21.1 4.5 VCC 5.0 VCC 5.5 VCC |
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