BR24L04F-W Rohm, BR24L04F-W Datasheet - Page 18

• Manufacturer Part Number: BR24L04F-W
• Description: 5128 bit electrically erasable PROM
• Manufacturer: Rohm

Memory ICs
6) I / O circuit
• Pull up resister of SDA pin
• Maximum of R
The pull up resister is needed because SDA is NMOS open drain. Decide the value of this resister (R
by considering V
If large R
Maximum of R
SDA rise time determined by R
And the other timing must keep the conditions of AC spec.
When SDA bus is HIGH, the voltage A of SDA bus determined by a total input leak (I
connected to the bus and R
including noise margin 0.2V
V
Examples : When V
CC
R
PU
PU
is chosen, clock frequency need to be slow. In case of small R
I
L
R
PU
PU
0.8V
PU
IL
is determined by following factor.
, I
According to 2
R
CC
L
PU
0.2V
IL
characteristics of a controller which control the device and V
V
CC
300 [k ]
0.8 3 0.7 3
IH
CC
10 10
V
3V I
CC
IH
PU
.
L
PU
6
must be enough higher than input HIGH level of a controller and the device,
10 A V
and the capacitance of bus line (CBUS) must be less than T
BR24L04-W / BR24L04F-W / BR24L04FJ-W
IH
0.7V
CC
MICRO
COMPUTER
BR24L04FV-W / BR24L04FVM-W
IL
PU
, the operating current increases.
R
PU
OH
THE CAPACITANCE OF
BUS LINE (CBUS)
A
, I
OL
IL
characteristics of the device.
L
BR24LXX
) of the all devices
SDA PIN
R
.
PU
) properly,
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