BR25H010-W ROHM [Rohm], BR25H010-W Datasheet - Page 12

• Manufacturer Part Number: BR25H010-W
• Manufacturer: ROHM [Rohm]

●High speed operation
In order to realize stable high speed operations, pay attention to the following input / output pin conditions.
○Input pin pull up, pull down resistance
○Pull up resistance
○Pull down resistance
Microcontroller
And, in order to prevent malfunction, mistake write at power ON/OFF, be sure to make CSB pull up.
Microcontroller
Further, by amplitude VIHE, VILE of signal input to EEPROM, operation speed changes. By inputting signal of amplitude of
VCC / GND level to input, more stable high speed operations can be realized. On the contrary, when amplitude of 0.8VCC /
0.2Vcc is input, operation speed becomes slow.
When to attach pull up, pull down resistance to EEPROM input pin, select an appropriate value for the microcontroller VOL,
IOL from VIL characteristics of this IC.
“L” output
“H” output
V
V
Fig.51 Pull up resistance
OLM
Fig.52 Pull down resistance
OHM
I
OLM
I
OHM
“L” input
“H” input
EEPROM
EEPROM
V
V
ILE
IHE
Example) When Vcc=5V, V
With the value of Rpu to satisfy the above equation, V
becomes 0.4V or higher, and with V
also satisfied.
Example) When V
12/16
from the equation ①,
∴R
・V
・V
・I
∴R
R
V
R
V
OLM
R
V
R
OLM
ILE
OLM
PU
PU
PU
IHE
OHM
PD
PD
PU
≥
≥
≥
=V
≤
≥
≥
≥
:Microcontroller V
:EEPROM V
:Microcontroller I
≥
CC
CC
×0.7V, from the equation③,
=5V, V
2.3[kΩ]
V
V
11.3[kΩ]
5-0.4
2×10
ILE
CC
0.4×10
ILE
V
V
I
5-0.5
I
OHM
OLM
=1.5V, V
IHE
-V
OHM
OHM
IL
OLM
-3
specifications
=V
-3
ILE
OL
OL
CC
OLM
(=1.5V), the equation ② is
specifications
-0.5V, I
specifications
=0.4V, I
･･･①
･･･②
･･･③
･･･④
OHM
OLM
＝0.4mA,
=2mA,
OLM