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參數(shù)資料
| 型號(hào)： | IDTQS5LV919-133J |
| 廠商： | INTEGRATED DEVICE TECHNOLOGY INC |
| 元件分類(lèi)： | 時(shí)鐘及定時(shí) |
| 英文描述： | 5LV SERIES, PLL BASED CLOCK DRIVER, 7 TRUE OUTPUT(S), 1 INVERTED OUTPUT(S), PQCC28 |
| 封裝： | PLASTIC, LCC-28 |
| 文件頁(yè)數(shù)： | 9/12頁(yè) |
| 文件大?。?/td> | 111K |
| 代理商： | IDTQS5LV919-133J |
6
INDUSTRIALTEMPERATURERANGE
QS5LV919
3.3V LOW SKEW CMOS PLL CLOCK DRIVER WITH INTEGRATED LOOP FILTER
ANALOG VCC
ANALOG G ND
DIGITAL
GND
DIG ITAL
VCC
BO ARD G ND
BO AR D VCC
0.1
μF
High
Freq.
Bypass
10
μF
Low
Freq.
Bypass
A separate Analog power supply is not necessary
and should not be used.
Following these pre-
scribed guidelines is all that is necessary to use
the Q S5LV919 in a norm al digital environm ent.
0.1
μF
Bypass
Figure 1. Recommended Analog Isolation Scheme for the QS5LV919
NOTES:
1. Figure 1 shows an analog isolation scheme which will be effective in most applications. The following guidelines should be followed to ensure stable and jitter-free operation:
a. All analog isolation components should be tied as close to the package as possible. Stray current passing through the parasitics of long traces can cause undesirable voltage
transients.
b. The 10F low frequency bypass capacitor and the 0.1F high frequency bypass capacitor form a wide bandwidth filter that will minimize the QS5LV919's sensitivity to voltage
transients from the system digital VCC supply and ground planes.
If good bypass techniques are used on a board design near components which may cause digital VCC and ground noise, VCC step deviations should not occur at the QS5LV919's
digital VCC supply. The purpose of the bypass filtering scheme shown in figure 1 is to give the QS5LV919 additional protection from the power supply and ground plane
transients that can occur in a high frequency, high speed digital system.
2. The bypass capacitors can be ceramic chip capacitors. There should be a 0.1F bypass capacitor between each of the other (digital) four VCC pins and the board ground plane.
This will reduce output switching noise caused by the QS5LV919 outputs, in addition to reducing potential for noise in the "analog" section of the chip. These bypass capacitors
should also be tied as close to the QS5LV919 package as possible.
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