CAT28C64BXI90 データシートの表示（PDF） - ON Semiconductor

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CAT28C64BXI90

64K-Bit CMOS PARALLEL EEPROM

ON Semiconductor 

CAT28C64B

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 com-

plete. 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, 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.

Figure 7. DATA Polling

ADDRESS

CE

WE

tOEH

tOE

OE

tOES

tWC

I/O7

DIN = X

DOUT = X

DOUT = X

Figure 8. Toggle Bit

WE

CE

tOEH

tOE

OE

tOES

I/O6

(1)

(1)

tWC

Note:

(1) Beginning and ending state of I/O6 is indeterminate.

© 2009 SCILLC. All rights reserved.

9

Characteristics subject to change without notice

Doc. No. MD-1011, Rev. I

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