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27C256-90ESO Datasheet(PDF) 3 Page - Microchip Technology |
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27C256-90ESO Datasheet(HTML) 3 Page - Microchip Technology |
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3 / 12 page  © 1996 Microchip Technology Inc. DS11001L-page 3 27C256 TABLE 1-3: READ OPERATION AC CHARACTERISTICS FIGURE 1-1: READ WAVEFORMS AC Testing Waveform: VIH = 2.4V and VIL = 0.45V; VOH = 2.0V VOL = 0.8V Output Load: 1 TTL Load + 100 pF Input Rise and Fall Times: 10 ns Ambient Temperature: Commercial: Tamb = 0˚C to +70˚C Industrial: Tamb = -40˚C to +85˚C Automotive: Tamb = -40 °C to +125°C Parameter Sym 27C256-90* 27C256-10* 27C256-12 27C256-15 27C256-20 Units Conditions Min Max Min Max Min Max Min Max Min Max Address to Output Delay tACC — 90 — 100 — 120 — 150 — 200 ns CE=OE =VIL CE to Output Delay tCE — 90 — 100 — 120 — 150 — 200 ns OE = VIL OE to Output Delay tOE — 40 — 45 — 55 — 65 — 75 ns CE = VIL CE or OE to O/P High Impedance tOFF 0 30 0 30 0 35 0 50 0 55 ns Output Hold from Address CE or OE, whichever goes first tOH 0 — 0 — 0— 0— 0— ns * -10, -90 AC Testing Waveform: VIH = 2.4V and VIL = .45V; VOH = 1.5V and VOL = 1.5V Output Load: 1 TTL Load + 30pF Address CE VIH VIL VIH VIL VIH VIL OE Outputs O0 - O7 VOH VOL Address Valid tCE(2) tOE(2) High Z Valid Output tACC (1) tOFF is specified for OE or CE, whichever occurs first (2) OE may be delayed up to t CE - t OE after the falling edge of CE without impact on tCE (3) This parameter is sampled and is not 100% tested. High Z tOH tOFF(1,3) Notes: |
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