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參數(shù)資料
| 型號(hào)： | EM78450 |
| 英文描述： | Dual Advanced Synchronous Rectified Buck MOSFET Drivers with Pre-POR OVP; Temperature Range: 0°C to 70°C; Package: 16-QFN |
| 中文描述： | 8位微控制器的通用產(chǎn)品 |
| 文件頁(yè)數(shù)： | 42/57頁(yè) |
| 文件大?。?/td> | 854K |
| 代理商： | EM78450 |
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EM78458/459
MASK ROM
This specification is subject to change without prior notice.
2002/03/01
47
100k
150 KHz
153 KHz
3.3k
1.43 MHz
1.35 MHz
5.1k
980 KHz
877 KHz
10k
520 KHz
465 KHz
100 pF
100k
57 KHz
54 KHz
3.3k
820 KHz
600 KHz
5.1k
550 KHz
400 KHz
10k
286 KHz
230 KHz
300 pF
100k
31 KHz
26 KHz
<Note>
1. Measured on DIP packages.
2. Design reference only
4. RC Oscillator Mode with Internal Capacitor
If both precision and cost are taken into consideration, EM78P257A/B also offers a special oscillation
mode. It is equipped with an internal capacitor and an external resistor (connected to Vcc). The
internal capacitor functions as temperature compensator. In order to obtain more accurate frequency,
a precise resistor is recommended.
OSCI
EM78458
Vcc
Rext
EM78459
Fig. 23 Circuit for Internal C Oscillator Mode
Table 15 R Oscillator Frequencies
Rext
Average Fosc 5V,25
°C
Average Fosc 3V,25
°C
51k
2.22 MHz
2.17 MHz
100k
1.15 MHz
1.14 MHz
300k
375 KHz
370 KHz
<Note> 1. Measured on DIP packages.
2. Design reference only
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