CAT28C64BJ-12 Datasheet, PDF(9/12 Page) Catalyst Semiconductor

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CAT28C64BJ-12 Datasheet, PDF (9/12 Pages) Catalyst Semiconductor – 64K-Bit CMOS PARALLEL E2PROM

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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/O0âI/O6

are indeterminate) until the programming cycle is com-

plete. Upon completion of the self-timed write cycle, all

I/Oâs 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

I/O7

Figure 8. Toggle Bit

tOEH

DIN = X

tOE

tWC

DOUT = X

tOES

DOUT = X

28C64B F10

tOEH

tOE

I/O6

(1)

tWC

Note:

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

tOES

(1)

28C64B F11

Doc. No. 25006-0A 2/98 P-1

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