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AM27C256-90EC Scheda tecnica(PDF) 7 Page - Advanced Micro Devices |
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AM27C256-90EC Scheda tecnica(HTML) 7 Page - Advanced Micro Devices |
7 / 12 page AMD 2-38 Am27C256 Output OR-Tieing To accommodate multiple memory connections, a two- line control function is provided to allow for: s Low memory power dissipation s Assurance that output bus contention will not occur It is recommended that CE be decoded and used as the primary device-selecting function, while OE be made a common connection to all devices in the array and con- nected to the READ line from the system control bus. This assures that all deselected memory devices are in low-power standby mode and that the output pins are only active when data is desired from a particular memory device. System Applications During the switch between active and standby condi- tions, transient current peaks are produced on the rising and falling edges of Chip Enable. The magnitude of these transient current peaks is dependent on the out- put capacitance loading of the device. At a minimum, a 0.1- µF ceramic capacitor (high frequency, low inherent inductance) should be used on each device between VCC and VSS to minimize transient effects. In addition, to overcome the voltage drop caused by the inductive ef- fects of the printed circuit board traces on EPROM ar- rays, a 4.7- µF bulk electrolytic capacitor should be used between VCC and VSS for each eight devices. The loca- tion of the capacitor should be close to where the power supply is connected to the array. MODE SELECT TABLE CE OE A0 A9 VPP Outputs Read VIL VIL XX X DOUT Output Disable X VIH X X X High-Z Standby (TTL) VIH X X X X High-Z Standby (CMOS) VCC + 0.3 V X X X X High-Z Program VIL VIH XX VPP DIN Program Verify VIH VIL XX VPP DOUT Program Inhibit VIH VIH XX VPP High-Z Manufacturer Code VIL VIL VIL VH X 01H Device Code VIL VIL VIH VH X 10H Auto Select (Note 3) Mode Pins Notes: 1. VH = 12.0 V + 0.5 V 2. X = Either VIH or VIL 3. A1–A8 = A10–A14 = VIL 4. See DC Programming Characteristics for VPP voltage during programming. |
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