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27C64-20SO Datasheet(PDF) 5 Page - Microchip Technology |
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27C64-20SO Datasheet(HTML) 5 Page - Microchip Technology |
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5 / 10 page  2004 Microchip Technology Inc. DS11107M-page 5 27C64 FIGURE 1-2: PROGRAMMING WAVEFORMS (1) TABLE 1-6: MODES Operation Mode CE OE PGM VPP A9 O0 - O7 Read VIL VIL VIH VCC XDOUT Program VIL VIH VIL VH XDIN Program Verify VIL VIL VIH VH XDOUT Program Inhibit VIH XX VH X High Z Standby VIH XX VCC X High Z Output Disable VIL VIH VIH VCC X High Z Identity VIL VIL VIH VCC VH Identity Code X = Don’t Care 1.2 Read Mode (See Timing Diagrams and AC Characteristics) Read Mode is accessed when a) the CE pin is low to power up (enable) the chip b) the OE pin is low to gate the data to the output pins For Read operations, if the addresses are stable, the address access time (tACC) is equal to the delay from CE to output (tCE). Data is transferred to the output after a delay from the falling edge of OE (tOE). |
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