ESMT

F59D1G81A / F59D1G161A

Elite Semiconductor Memory Technology Inc.

Publication Date: May

2014

Revision: 1.5

36/43

Ready / Busy

The device has a R/ B output that provides a hardware method of indicating the completion of a page program, erase and random

read completion. The R/ B pin is normally high but transition to low after program or erase command is written to the command

register or random read is started after address loading. It returns to high when the internal controller has finished the operation. The

pin is an open-drain driver thereby allowing two or more R/ B outputs to be Or-tied. Because pull-up resistor value is related to tr (R/ B )

and current drain during busy (ibusy), an appropriate value can be obtained with the following reference chart. Its value can be

determined by the following guidance.

Ready/ Busy Pin Electrical Specifications

where IL is the sum of the iput currents of all devices tied to the R/ B pin.

Rp(max) is determined by maximum permissible limit of tr