CAT28C257 查看數據表（PDF） - ON Semiconductor

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CAT28C257

256 kb CMOS Parallel EEPROM

ON Semiconductor 

CAT28C257

DATA Polling

DATA polling is provided to indicate the completion of

write cycle. Once a byte write or page write cycle is initiated,

attempting to read the last byte written will output the

complement of that data on I/O7 (I/O0–I/O6 are

indeterminate) until the programming cycle is complete.

Upon completion of the self−timed write cycle, all I/O’s will

output true data during a read cycle.

Toggle Bit

In addition to the DATA Polling feature of the

CAT28C257, the device offers an additional method for

determining the completion of a write cycle. While a write

cycle is in progress, reading data from the device will result

in I/O6 toggling between one and zero. However, once the

write is complete, I/O6 stops toggling and valid data can be

read from the device.

ADDRESS

CE

WE

tOEH

tOE

OE

tOES

Figure 8. DATA Polling

WE

CE

tOEH

tOE

OE

I/O6

(Note 14)

Figure 9. Toggle Bit

14. Beginning and ending state of I/O6 is indeterminate.

tOES

(Note 14)

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