Datasheet > FT28HC256PMB-15

FT28HC256PMB-15

更新时间： 2022-10-12 13:40:48

品牌	Logo	应用领域
福思力 - FORCE		可编程只读存储器电动程控只读存储器电可擦编程只读存储器
页数	文件大小	规格书
23页	2123K
描述
5 Volt, Byte Alterable EEPROM

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数据手册

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FT28HC256PMB-15 数据手册

FT28HC256

THE TOGGLE BIT I/O

Figure 4. Toggle Bit Bus Sequence

Last

Write

HIGH Z

I/O

Ready

* I/O Beginning and ending state of I/O will vary.

Figure 5. Toggle Bit Software Flow

HARDWARE DATA PROTECTION

The FT28HC256 provides two hardware features that

protect nonvolatile data from inadvertent writes.

Last Write

Yes

– Default V Sense—All write functions are inhibited

when V is 3.5V typically.

– Write Inhibit—Holding either OE LOW, WE HIGH, or

CE HIGH will prevent an inadvertent write cycle during

power-up and power-down, maintaining data integrity.

Load Accum

From Addr n

SOFTWARE DATA PROTECTION

The FT28HC256 offers a softw are-controlled data pro-

tection feature. The FT28HC256 is shipped from FT

with the software data protection NOT ENABLED; that

is, the device will be in the standard operating mode. In

this mode data should be protected during power-up/

down operations through the use of e xternal circuits.

The host would then have open read and write access

Compare

Accum with

Addr n

Compare

ok?

of the device once V

was stable.

Yes

The FT28HC256 can be automatically protected during

power-up and power-down (without the need for exter-

nal circuits) by employing the software data protection

feature. The internal software data protection circuit is

enabled after the first w ite operation, utilising the soft-

ware algor ithm. This circuit is non volatile, and will

remain set for the life of the device unless the reset

command is issued.

FT28C256

Ready

The Toggle Bit can eliminate the chore of saving and

fetching the last address and data in order to implement

DATA Polling. This can be especially helpful in an array

comprised of multiple FT28HC256 memories that is

frequently updated. The timing diagram in Figure 4

illustrates the sequence of events on the bus. The soft-

ware flow diagram in Figure 5 illustrates a method for

polling the Toggle Bit.

Once the software protection is enabled, the FT28HC256 is

also protected from inadvertent and accidental writes in the

powered-up state. That is, the software algorithm must be

issued prior to writing additional data to the device.

Characteristics subject to change without notice. 5 of 23

REV 1.0

1 2 3 456 7 8...23

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