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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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GD9FS1G8F2ADG датащи(PDF) 39 Page - GigaDevice Semiconductor (Beijing) Inc. |
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GD9FS1G8F2ADG датащи(HTML) 39 Page - GigaDevice Semiconductor (Beijing) Inc. |
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39 / 55 page  GD9Fx1GxF2A 39 8.7 Ready/Busy# (R/B#) The device has a Ready/Busy output that provides method of indicating the completion of a page program, erase, copy- back and random read completion. The R/B# pin is normally high and goes to low when the device is busy (after a reset, read, program, and erase operation). 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#), an appropriate value can be obtained with the following reference below chart. Its value can be determined by the following guidance. Vcc GND Device Rp R/B# Open drain output Ready Vcc tf VOL Busy VOL : 0.4V, VOH : 2.4V tr VOH tf 160 108.8 69.8 35 tr 50 100 200 Rp(ohm) 1K 2K 3K 4K Fig. Rp vs tr, tf & Rp @ Vcc = 3.3 V, Ta = 25ºC,CL=50pF Rp (min) = Rp value guidence Vcc (Max.) – V OL (Max.) IOL + ΣIL = 3.2V 8mA + ΣIL Where IL is the sum of the input curmts of all devices tied to the R/B# pin. Rp(max) is determined by maximum permissible limit of tr 5K 182 150 3.84 3.66 3.22 3.76 3.86 Figure 29: Ready/Busy figures |
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