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| 型号： | EM78459 |
| 英文描述： | Dual Advanced Synchronous Rectified Buck MOSFET Drivers with Pre-POR OVP; Temperature Range: -40°C to 85°C; Package: 14-SOIC |
| 中文描述： | 8位微控制器的通用产品 |
| 文件页数： | 39/57页 |
| 文件大小： | 854K |
| 代理商： | EM78459 |
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EM78458/459
MASK ROM
This specification is subject to change without prior notice.
2002/03/01
44
Option. The up-limited operation frequency of crystal/resonator on the different VDDs is listed in
Table 11
Table 12 The Summary of Maximum Operating Speeds
Conditions
VDD
Fxt max.(MHz)
2.3
4
3.0
8
Two clocks
5.0
20
2. Crystal Oscillator/Ceramic Resonators (XTAL)
EM78458/459 can be driven by an external clock signal through the OSCI pin as shown in Fig. 18
below.
OSCI
OSCO
Ext.
Clock
EM78458
EM78459
Fig. 18 Circuit for External Clock Input
In the most applications, pin OSCI and pin OSCO can be connected with a crystal or ceramic
resonator to generate oscillation. Fig. 19 depicts such circuit. The same applies to the HXT mode and
the LXT mode. Table 12 provided the recommended values of C1 and C2. Since each resonator has
its own attribute, user should refer to their specifications for appropriate values of C1 and C2. RS, a
serial resistor, may be necessary for AT strip cut crystal or low frequency mode.
OSCI
OSCO
EM78458
EM78459
C1
C2
XTAL
RS
Fig. 19 Circuit for Crystal/Resonator
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| EM78459AK | 制造商:EMC 制造商全称:ELAN Microelectronics Corp 功能描述:8-Bit Microcontroller with MASK ROM |
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| EM78468BQ | 制造商:EMC 制造商全称:ELAN Microelectronics Corp 功能描述:8-BIT Microcontroller |
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