參數(shù)資料
型號: K9F1G08Q0A
廠商: SAMSUNG SEMICONDUCTOR CO. LTD.
英文描述: FLASH MEMORY
中文描述: 閃存
文件頁數(shù): 36/37頁
文件大小: 677K
代理商: K9F1G08Q0A
FLASH MEMORY
36
K9F1G08U0A
K9F1G08Q0A
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 transitions to low after program or erase command is written to the command regis-
ter 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(Fig 17). Its value can be
determined by the following guidance.
V
CC
R/B
open drain output
Device
GND
Rp
Figure 17. Rp vs tr ,tf & Rp vs ibusy
ibusy
Busy
Ready Vcc
VOH
tf
tr
VOL
1.8V device - V
OL
: 0.1V, V
OH
: V
CC
-0.1V
3.3V device - V
OL
: 0.4V, V
OH
: 2.4V
C
L
tr,tf [s]
Ibusy [A]
Rp(ohm)
Ibusy
tr
@ Vcc = 1.8V, Ta = 25
°
C , C
L
= 30pF
1K
2K
3K
4K
100n
200n
300n
3m
2m
1m
30
tf
60
90
120
1.7
1.7
1.7
1.7
1.7
0.85
0.57
0.43
tr,tf [s]
Ibusy [A]
Rp(ohm)
Ibusy
tr
@ Vcc = 3.3V, Ta = 25
°
C , C
L
= 50pF
1K
2K
3K
4K
100n
200n
300n
3m
2m
1m
50
tf
100
150
200
1.8
1.8
1.8
1.8
2.4
1.2
0.8
0.6
Rp(min, 1.8V part) =
V
CC
(Max.) - V
OL
(Max.)
I
OL
+
Σ
I
L
=
1.85V
3mA
+
Σ
I
L
where I
L
is the sum of the input currents of all devices tied to the R/B pin.
Rp(max) is determined by maximum permissible limit of tr
Rp value guidance
Rp(min, 3.3V part) =
V
CC
(Max.) - V
OL
(Max.)
I
OL
+
Σ
I
L
=
3.2V
8mA
+
Σ
I
L
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