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BU9832GUL-W (8Kbit)
Datasheet
● 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
When to attach pull up, pull down resistance to EEPROM input pin, select an appropriate value for the microcontroller V OL ,
I OL from V IL characteristics of this IC.
○ Pull up resistance
R PU ≧
V OLM ≦
V CC -V OLM
I OLM
V ILE
???①
???②
Microcontroller
V OLM
I OLM
R PU
EEPROM
V ILE
Example) When Vcc=5V, V ILM =1.5V, V OLM =0.4V, I OLM =2mA,
from the equation ① ,
“L” output
“L” input
Figure 47. Pull up resistance
R PU ≧
∴ R PU ≧
5-0.4
2×10 -3
2.3[ Ω ]
With the value of R PU to satisfy the above equation, V OLM becomes
0.4V or higher, and with V ILE (=1.5V), the equation ② is also
satisfied.
? V ILM :EEPROM V IH specifications
? V OLM :Microcontroller V OL specifications
? I OLM :Microcontroller I OL specifications
And, in order to prevent malfunction, mistake write at power ON/OFF, be sure to make CS pull up.
○ Pull down resistance
V OHM
EEPROM
V IHE
R PD ≧
V OHM ≧
V OHM
I OHM
V IHE
???③
???④
I OHM
Example) When V CC =5V, V OHM =V CC -0.5V, I OHM =0.4mA,
Figure 48. Pull down resistance
V IHM =V CC ×0.7V, from the equation ③,
5-0.5
R PD ≧
∴ R PU ≧
0.4×10 -3
11.3[k Ω ]
0.2Vcc is input, operation speed becomes slow.
Further, by amplitude V IHE , V ILE of signal input to EEPROM, operation speed changes. By inputting signal of amplitude of
V CC / GND level to input, more stable high speed operations can be realized. On the contrary, when amplitude of 0.8V CC /
ж 1
In order to realize more stable high speed operation, it is recommended to make the values of R PU , R PD as large as
possible, and make the amplitude of signal input to EEPROM close to the amplitude of V CC / GND level.
( ж 1 At this moment, operating timing guaranteed value is guaranteed.)
tPD_VIL characteristics
80
Spec
70
60
50
40
30
Vcc=2.5V
20
10
0
Ta=25 ℃
VIH=Vcc
C L =100pF
0
0.2
0.4
0.6
0.8
1
VIL[V]
Figure 49. V IL dependency of data output delay time
www.rohm.com
? 2012 ROHM Co., Ltd. All rights reserved.
TSZ22111 ? 15 ? 001
20/26
TSZ02201-0R2R0G100410-1-2
30.AUG.2012 Rev.001
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