CAT22C10 Просмотр технического описания (PDF) - ON Semiconductor

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CAT22C10

256-Bit Nonvolatile CMOS Static RAM

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CAT22C10

Write

With the chip enabled and the nonvolatile functions

inhibited, the Write Enable (WE) pin will select the write

mode when driven to a low level. In this mode, the

address must be supplied for the byte being written.

After the set-up time (tAS), the input data must be

supplied to pins I/O0–I/O3. When these conditions, in-

cluding the write pulse width time (tWP) are met, the data

will be written to the specified location in the Static RAM.

A write function may also be initiated from the standby

mode by driving WE low, inhibiting the nonvolatile func-

tions, supplying valid addresses, and then taking CS low

and supplying input data.

Figure 2. Write Cycle Timing

ADDRESS

CS

tAS

WE

DATA IN

DATA OUT

tWC

tCW

tWP

tWR

tDW

tDH

DATA VALID

tWZ

tOW

HIGH-Z

Figure 3. Early Write Cycle Timing

ADDRESS

CS

tAS

WE

DATA IN

DATA OUT

tWC

tCW

tWP

tDW

DATA VALID

HIGH-Z

tWR

tDH

© 2009 SCILLC. All rights reserved.

Characteristics subject to change without notice.

7

Doc No. MD-1082, Rev. R

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