參數(shù)資料
型號(hào)： BR24L01
廠商： Rohm CO.,LTD.
英文描述： 128】8 bit electrically erasable PROM
中文描述： 128】8位電可擦除可編程ROM
文件頁數(shù)： 21/26頁
文件大?。?/td> 391K
代理商： BR24L01
BR24L01A-W / BR24L01AF-W / BR24L01AFJ-W /
Memory ICs
BR24L01AFV-W / BR24L01AFVM-W
21/25
The maximum value of R
S
The maximum value of R
S
is determined by following factors.
x
SDA rise time determined by R
PU
and the capacitance of bus line (CBUS ) of SDA must be less than t
R
.
And the other timing must also keep the conditions of the AC timing.
y
When the device outputs LOW on SDA line, the voltage of the bus A determined by R
PU
and R
S
must be
lower than the inputs LOW level of the controller, including recommended noise margin (0.1V
CC
).
V
OL
V
IL
R
PU
V
CC
R
S
I
OL
CONTROLLER
EEPROM
A
CAPACITANCE OF
BUS LINE (CBUS)
R
S
≤
×
R
PU
1.1V
CC
V
IL
V
IL
V
OL
0.1V
CC
R
S
≤
×
20
×
10
3
1.1
×
3
0.3
×
3
0.3
×
3
0.4
0.1
×
3
+
V
OL
+
0.1V
CC
≤
V
IL
(V
CC
V
OL
)
×
R
S
R
PU
+
R
S
≤
1.67 [k
]
Examples : when V
CC
=
3V, V
IL
=
0.3V
CC
, V
OL
=
0.4V, R
PU
=
20k
According to 2
The minimum value of R
S
The minimum value of R
S
is determined by the current overload due to the conflict on the bus.
The current overload may cause noise on the power line and instantaneous power down.
The following conditions must be met, where
Ι
is the maximum permissible current.
The maximum permissible current depends on V
CC
line impedance and so on. It need to be less than 10mA for
EEPROM.
R
S
≥
V
CC
Ι
R
S
≥
3
10
×
10
3
≤
Ι
V
CC
R
S
≥
300 [
]
Examples : When V
CC
=
3V,
Ι=
10mA
R
PU
R
S
CONTROLLER
EEPROM
"L" OUTPUT
"H" OUTPUT
MAXIMUM
CURRENT
Ι
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