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參數(shù)資料
| 型號： | EM78Q156A |
| 廠商： | ELAN Microelctronics Corp . |
| 英文描述： | 8-Bit Micro-Controller for General-Purpose Product(工作電壓2.5V-6.5V的8位微控制器) |
| 中文描述： | 8位微控制器的通用產(chǎn)品（工作電壓為2.5V至6.5V的8位微控制器） |
| 文件頁數(shù)： | 17/24頁 |
| 文件大?。?/td> | 274K |
| 代理商： | EM78Q156A |
17
* This specification are subject to be changed without notice.
EM78Q156A/B
8-BIT MICRO-CONTROLLER FOR GENERAL PURPOSE PRODUCT
Rext
Average Fosc @ 5V, 25
°
C
3.3k
3.20 MHz
5.1k
2.22 MHz
10k
1.28 MHz
100k
150 KHz
3.3k
1.13 MHz
5.1k
758 KHz
10k
409 KHz
100k
51 KHz
3.3k
472 KHz
5.1k
310 KHz
10k
165 KHz
100k
17.5 KHz
* Measured on DIP packages.
6.30.1998
Preliminary
Cext
20pF
Average Fosc @ 3V, 25
°
C
2.47 MHz
1.83 MHz
1.14 MHz
143 KHz
974 KHz
675 KHz
376 KHz
43.7 KHz
420 KHz
283 KHz
153 KHz
17.0 KHz
100pF
300pF
In most case, the timing accuracy is not vary important . So the "RC Oscillator" offers lots of cost savings. But
the RC oscillator frequency is a function of the supply voltage
'
the resistor (Rext)
'
capacitor (Cext) values and
the operation temperature. In addition to this, the oscillator frequency will vary little from unit to unit due to
process parameter variation.
We strongly suggest user should take into account the frequency variation due to tolerance of Rext
'
Cext
values and the voltage temperature effect.
Besides, formore stable consideration, the Cext should not less than 20pF and Rext should not great than 1M
Ohm. In such case the PCB trace capacitance, package lead frame capacitance and leakage current will become
frequency insensitive.
If the Rext become smaller the frequency become faster, However when Rext value less the 1K Ohm there may
occure unstable condition due to the NMOS can't discharge the capacitance's current correctly the user should
pay attention on it.
Power on Voltage Detector
The EM78Q156A internal built-in power on voltage detector whichs detect level is set at 1.8 voltage.
At some application you may find out your system would lost control after power on-off occured. In this
circumstance we suggested strongly you should using the EM78Q156A instead of EM78Q156B.
No pains no gains, How ever using EM78Q156A the internal power on voltage detector cost you 15
μ
A current
consumption . So in some power consumption considerable application you should think about 15
μ
A pain.
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