CAT28C16API-20 datasheet(7/8 Pages) CATALYST

7 / 8 page

CAT28C16A

Doc. No. 25033-00 2/98

ADDRESS

I/O7

DIN = X

DOUT = X

tOE

tOEH

tWC

tOES

DATA Polling

DATA polling is provided to indicate the completion of a

byte write cycle. Once a byte 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 indeter-

minate) until the programming cycle is complete. Upon

completion of the self-timed byte write cycle, all I/O’s will

output true data during a read cycle.

Byte Write

A write cycle is executed when both CE and WE are low,

and OE is high. Write cycles can be initiated using either

WE or CE, with the address input being latched on the

falling edge of WE or CE, whichever occurs last. Data,

conversely, is latched on the rising edge of WE or CE,

whichever occurs first. Once initiated, a byte write cycle

automatically erases the addressed byte and the new

data is written within 10 ms.

Figure 5. Byte Write Cycle [CE Controlled]

5089 FHD F07

ADDRESS

DATA OUT

tAS

DATA IN

DATA VALID

HIGH-Z

tAH

tWC

tOEH

tDH

tDS

tOES

tDL

tCH

tCS

tCW

Figure 6. DATA Polling

28C16A F08

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