參數(shù)資料
型號： MC92602ZTA
廠商： FREESCALE SEMICONDUCTOR INC
元件分類： 微控制器/微處理器
英文描述： SPECIALTY MICROPROCESSOR CIRCUIT, PBGA196
封裝： 15 X 15 MM, 1.60 MM HEIGHT, 1 MM PITCH, MAPBGA-196
文件頁數(shù)： 52/102頁
文件大?。?/td> 1581K
代理商： MC92602ZTA
MOTOROLA
Chapter 5. System Design Considerations
5-5
HSTL Reference Voltage Recommendation
vias, these capacitors should be placed in a ring around the MC92602, as close to the supply
and ground connections as possible.
Second, there should be a 1-
F ceramic chip capacitor on each side of the MC92602 device.
This should be done for both the 1.8- and 1.5-V supply.
Third, between the MC92602 device and the voltage regulator, there should be a 10-
F, low
equivalent series resistance (ESR) SMT tantalum chip capacitor, and a 100-
F, low ESR
SMT tantalum chip capacitor. This should be done for both the 1.8- and 1.5-V supply.
5.8
HSTL Reference Voltage Recommendation
The MC92602 uses HSTL Class-I inputs and outputs for all of its high-frequency parallel
interface signals. The HSTL Class-I interfaces are compatible with EIA/JEDEC Standard
EIA/JESD8-6 [3].
HSTL Class-I inputs define their switching thresholds about a reference voltage supplied
at an input of the device. The reference voltage is applied to the HSTL_VREF input of the
MC92602. The reference voltage, referred to as VREF in Table 7-3, must fall within the
minimum and maximum voltages as specified and must have no more than 2%
peak-to-peak AC noise. In practice, VREF for the HSTL inputs should track the variations
in the DC value of VDDQ of the sending device for best noise margin. The value of VREF is
to be selected by the user to provide optimum noise margin. Figure 5-2 shows a
recommended circuit topology to generate VREF with a recommended ceramic chip filter
capacitor.
Figure 5-2. HSTL Class-I VREF Circuit
VDDQ
GND
1.0 F
HSTL_VREF
100
110
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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