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NM27C256V90 Datasheet(PDF) 4 Page - Fairchild Semiconductor |
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NM27C256V90 Datasheet(HTML) 4 Page - Fairchild Semiconductor |
4 / 11 page 4 www.fairchildsemi.com AC Test Conditions Output Load 1 TTL Gate and CL = 100 pF (Note 8) Input Rise and Fall Times ≤ 5 ns Input Pulse Levels 0.45 to 2.4V Timing Measurement Reference Level (Note 10) Inputs 0.8V and 2.0V Outputs 0.8V and 2.0V AC Waveforms (Note 6) (Note 7) (Note 9) Note 1: Stresses above those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. This is stress rating only and functional operation of the device at these or any other conditions above those indicated in the operational sections of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. Note 2: This parameter is only sampled and is not 100% tested. Note 3: OE may be delayed up to tACC - tOE after the falling edge of CE without impacting tACC. Note 4: The tDF and tCF compare level is determined as follows: High to TRI-STATE®, the measured VOH1 (DC) - 0.10V; Low to TRI-STATE, the measured VOL1 (DC) + 0.10V. Note 5: TRI-STATE may be attained using OE or CE. Note 6: The power switching characteristics of EPROMs require careful device decoupling. It is recommended that at least a 0.1 µF ceramic capacitor be used on every device between V CC and GND. Note 7: The outputs must be restricted to V CC + 1.0V to avoid latch-up and device damage. Note 8: TTL Gate: I OL = 1.6 mA, IOH = -400 µA. C L = 100 pF includes fixture capacitance. Note 9: VPP may be connected to VCC except during programming. Note 10: Inputs and outputs can undershoot to -2.0V for 20 ns Max. Note 11: CMOS inputs: VIL = GND ±0.3V, VIH = VCC ±0.3V. Programming Characteristics (Note 12) (Note 13) (Note 14) (Note 15) Symbol Parameter Conditions Min Typ Max Units ADDRESSES VALID VALID OUTPUT Hi-Z Hi-Z 2.0V 0.8V 2.0V 0.8V 2.0V 0.8V 2.0V 0.8V ADDRESSES CE OE OUTPUT t OE (Note 3) t ACC (Note 3) t CE t CE (Notes 4, 5) t OH t DF (Notes 4, 5) DS010833-4 |
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