Datasheet > FT28HC256PM-15

FT28HC256PM-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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FT28HC256PM-15 数据手册

FT28HC256

RESETTING SOFTWARE DATA PROTECTION

Figure 8. Reset Software Data Protection Timing Sequence

AAA

5555

2AAA

5555

2AAA

5555

Standard

Operating

Mode

Data

Address

Figure 9. Write Sequence for resetting Software

Data Protection

In the event the user wants to deactivate the software

data protection feature for testing or reprogramming in

an EEPROM programmer, the following six step algo-

rithm will reset the internal protection circuit. After t

the FT28HC256 will be in standard operating mode.

Write Data AA

to Address

5555

Note: Once initiated, the sequence of write operations

should not be interrupted.

Write Data 55

to Address

2AAA

SYSTEM CONSIDERATIONS

Because the FT28HC256 is frequently used in large

memory arrays, it is provided with a two line control

architecture for both read and write operations. Proper

usage can provide the lowest possible power dissipa-

tion, and eliminate the possibility of contention where

multiple I/O pins share the same bus.

Write Data 80

to Address

5555

Write Data AA

to Address

5555

To gain the most benefit, it is recommended that CE be

decoded from the address bus and be used as the pri-

mary device selection input. Both OE and WE would

then be common among all devices in the array. For a

read operation, this assures that all deselected devices

are in their standby mode, and that only the selected

device(s) is/are outputting data on the bus.

Write Data 55

to Address

2AAA

Because the FT28HC256 has two power modes ,

standby and active, proper decoupling of the memory

array is of prime concern. Enabling CE will cause tran-

sient current spikes. The magnitude of these spikes is

dependent on the output capacitive loading of the l/Os.

Therefore, the larger the array sharing a common bus,

the larger the transient spikes. The voltage peaks

associated with the current transients can be sup-

pressed by the proper selection and placement of

decoupling capacitors. As a minimum, it is recommended

Write Data 20

to Address

5555

After t

Re-Enters

Unprotected

State

Characteristics subject to change without notice. 7 of 23

REV 1.0

1...4 5 678 9 10...23

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