AS8ER128K32QB-250/883C(2003) Просмотр технического описания (PDF) - Austin Semiconductor

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AS8ER128K32QB-250/883C
(Rev.:2003)

128K x 32 EEPROM Radiation Tolerant EEPROM Memory Array

Austin Semiconductor 

Austin Semiconductor, Inc.

EEPROM

AS8ER128K32

SOFTWARE DATA PROTECTION TIMING WAVEFORM (In non-protection mode)

VCC

CE\

tWC

Normal

active mode

WE\

Address

5555 AAAA 5555 5555 AAAA 5555

or

or

End Of Life Data(eachbyte)

2AAA

2AAA

AA 55

80 AA 55

20

FUNCTIONAL DESCRIPTION

Automatic Page Write

Page-mode write feature allows 1 to 128 bytes of data to be

written into the EEPROM in a single write cycle. Following

the initial byte cycle, an additional 1 to 128 bytes can be writ-

ten in the same manner. Each additional byte load cycle must

be started within 30µs from the preceding falling edge of WE\

RDY/Busy\ Signal

RDY/Busy\ signal also allows status of the EEPROM to be

determined. The RDY/Busy\ signal has high impedance ex-

cept in write cycle and is lowered to VOL after the first write

signal. At the end of write cycle, the RDY/Busy\ signal changes

state to high impedance.

or CE\. When CE\ or WE\ is kept high for 100µs after data

input, the EEPROM enters write mode automatically and the RES\ Signal

input data are written into the EEPROM.

When RES\ is low, the EEPROM cannot be read or pro-

DATA\ Polling

DATA\ polling allows the status of the EEPROM to be deter-

mined. If EEPROM is set to read mode during the write cycle,

an inversion of the last byte of data to be loaded outputs from

grammed. Therefore, data can be protected by keeping RES\

low when VCC is switched. RES\ should be high during read

and programming because it doesn't provide a latch function.

See timing diagram below.

I/O's 7, 15, 23, and 31 to indicate that the EEPROM is per-

forming a write operation.

RES\ Signal Diagram

VCC

RES\

Read inhibit

Program inhibit

Read inhibit

Program inhibit

AS8ER128K32

Rev. 4.5 2/03

11

Austin Semiconductor, Inc. reserves the right to change products or specifications without notice.

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