 2004 Microchip Technology Inc.

DS11107M-page 5

27C64

FIGURE 1-2:

PROGRAMMING WAVEFORMS (1)

TABLE 1-6:

MODES

Operation Mode

CE

OE

PGM

A9

O0 - O7

Read

Program

Program Verify

Program Inhibit

XX

X

High Z

Standby

XX

X

High Z

Output Disable

X

High Z

Identity

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