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27C04AT-20L Datasheet(PDF) 4 Page - Microchip Technology |
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27C04AT-20L Datasheet(HTML) 4 Page - Microchip Technology |
4 / 8 page 28C04A DS11126F-page 4 © 1996 Microchip Technology Inc. TABLE 1-4: BYTE WRITE AC CHARACTERISTICS FIGURE 1-2: PROGRAMMING WAVEFORMS AC Testing Waveform: VIH = 2.4V; VIL = 0.45V; VOH = 2.0V; VOL = 0.8V Output Load: 1 TTL Load + 100 pF Input Rise/Fall Times: 20 nsec Ambient Temperature: Commercial (C): Tamb= 0˚C to 70˚C Industrial (I): Tamb= -40˚C to 85˚C Parameter Symbol Min Max Units Remarks Address Set-Up Time tAS 10 ns Address Hold Time tAH 50 ns Data Set-Up Time tDS 50 ns Data Hold Time tDH 10 ns Write Pulse Width tWPL 100 ns Note 1 Write Pulse High Time tWPH 50 ns OE Hold Time tOEH 10 ns OE Set-Up Time tOES 10 ns Data Valid Time tDV 1000 ns Note 2 Write Cycle Time (28C04A) tWC 1 ms 0.5 ms typical Write Cycle Time (28C04AF) tWC 200 µs 100 µs typical Note 1: A write cycle can be initiated be CE or WE going low, whichever occurs last. The data is latched on the pos- itive edge of CE or WE, whichever occurs first. 2: Data must be valid within 1000ns max. after a write cycle is initiated and must be stable at least until tDH after the positive edge of WE or CE, whichever occurs first. tAS tAH tWPL tDS tDH tOES tOEH tDV Address CE, WE Data In OE VIH VIL VIH VIL VIH VIL VIH VIL |
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