BR9080 데이터 시트보기 (PDF) - ROHM Semiconductor

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BR9080

8k, 16k bit EEPROMs for direct connection to serial ports

ROHM Semiconductor 

Memory ICs

BR9080 / BR9080F / BR9080RFV /

BR9016 / BR9016F / BR9016RFV

(5) READY / BUSY display (R / B pin and DO pin: BR9080 / F / RFV, BR9016 / F / RFV)

1) This display outputs the internal status signal; the R / B pin outputs the HIGH or LOW status at all times. The display

can also be output from the DO pin. Following completion of the writing command, if CS falls while SK is LOW, either

HIGH or LOW is output. (The display can also be output without using the R / B pin, leaving it open.)

2) When writing data to a memory cell, the READY / BUSY display is output from the rise of the 32nd clock pulse of the

SK signal after tSV, from the R / B pin.

R / B display = LOW: writing in progress

(The internal timer circuit is activated, and after the tE / W timing has been created, the timer circuit stops automatically.

Writing of data to the memory cell is done during the tE / W timing, during which time other commands cannot be

received.)

R / B display = HIGH: command standby state

(Writing of data to the memory cell has been completed and the next command can be received.)

SK

CS

DI

DO

R/B

Clock

Write command

HIGH-Z

READY

tPD

BUSY

BUSY

tOZ

READY

HIGH-Z

READY

Fig.8 R / B Status Output timing chart

1) D0 will output R / B status after CS is held low during SK=L, until CS is held high.

Note : The document may be strategic technical data subject to COCOM regulations.

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