Datasheet

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BR25L010-W, BR25L020-W, BR25L040-W, BR25L080-W, BR25L160-W, BR25L320-W, BR25L640-W
Technical Note
High speed operation
In order to realize stable high speed operations, pay attention to the following input / output pin conditions.
And, in order to prevent malfunction, mistake write at power ON/OFF, be sure to make CS pull up.
Pull up resistance
Pull down resistance
Fig.53 Pull up resistance
Fig.54 Pull down resistance
With the value of Rpu to satisfy the above equation, V
OLM
becomes 0.4V or higher, and with VILE (= 1.5V), the equation
is also satisfied.
R
PU ≥
VCC - VOLM
IOLM
VOLM ≤ VILE
5 - 0.4
2 X 10
-3
RPU≥
2.3[kΩ]RPU≥
Example) When Vcc = 5V, VOHM = Vcc - 0.5V, IOHM = 0.4mA,
V
IHM = Vcc X 0.7V, from the equation ,
R
PD ≥
VOHM
IOHM
VOHM ≥ VIHE
5 - 0.5
0.4 X 10
-3
RPD≥
11.3[kΩ]RPD≥
"L" output
Microcontroller I
OHM
VOLM
"L" input
EEPROM
V
ILE
VOHM
IOHM
EEPROM
V
IHE
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.
Input pin pull up, pull down resistance
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.
Example) When Vcc = 5V, V ILM = 1.5V, VOLM = 0.4V, IOLM = 2mA,
from the equation ,
2010.07 - Rev. B
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