- 您現(xiàn)在的位置：買(mǎi)賣(mài)IC網(wǎng) > PDF目錄371076 > MC88LV926 (Motorola, Inc.) LOW SKEW CMOS PLL 68060 CLOCK DRIVER PDF資料下載
參數(shù)資料
| 型號(hào)： | MC88LV926 |
| 廠商： | Motorola, Inc. |
| 英文描述： | LOW SKEW CMOS PLL 68060 CLOCK DRIVER |
| 中文描述： | 低偏移的CMOS鎖相環(huán)68060時(shí)鐘驅(qū)動(dòng)器 |
| 文件頁(yè)數(shù)： | 8/10頁(yè) |
| 文件大小： | 108K |
| 代理商： | MC88LV926 |
MC88LV926
MOTOROLA
TIMING SOLUTIONS
BR1333 — REV 5
8
The tPD spec includes the full temperature range from 0
°
C
to 70
°
C and the full VCC range from 3.0V to 3.3V. If the
T
and
VCC is a given system are less than the specification
limits, the tPD spec window will be reduced. The tPD
window for a given
T and
VCC is given by the following
regression formula:
TBD
5. The RST_OUT pin is an open drain N–Channel output.
Therefore an external pull–up resistor must be provide to
pull up the RST_OUT pin when it goes into the high
impedance state (after the MC88LV926 is phase–locked
to the reference input with RST_IN held high or 1024 ‘Q’
cycles after the RST_IN pin goes high when the part is
locked). In the tPLZ and tPZL specifications, a 1K
resistor
is used as a pull–up as shown in Figure 3.
Notes Concerning Loop Filter and Board Layout Issues
1. Figure 6. shows a loop filter and analog isolation scheme
which will be effective in most applications. The following
guidelines should be followed to ensure stable and
jitter–free operation:
1a. All loop filter and 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 at the RC1 pin.
1b. The 47
resistors, the 10
μ
F low frequency bypass
capacitor, and the 0.1
μ
F high frequency bypass capacitor
form a wide bandwidth filter that will make the 88LV926
PLL insensitive to voltage transients from the system
digital VCC supply and ground planes. This filter will
typically ensure that a 100mV step deviation on the digital
VCC supply will cause no more than a 100ps phase
deviation on the 88LV926 outputs. A 250mV step
deviation on VCC using the recommended filter values
will cause no more than a 250ps phase deviation; if a
25
μ
F bypass capacitor is used (instead of 10
μ
F) a
250mV VCC step will cause no more than a 100ps phase
deviation.
If good bypass techniques are used on a board design
near components which may cause digital VCC and
ground noise, the above described VCC step deviations
should not occur at the 88LV926’s digital VCC supply. The
purpose of the bypass filtering scheme shown in Figure
6. is to give the 88LV926 additional protection from the
power supply and ground plane transients that can occur
in a high frequency, high speed digital system.
1c. There are no special requirements set forth for the loop
filter resistors (470K and 330
). The loop filter capacitor
(0.1uF) can be a ceramic chip capacitor, the same as a
standard bypass capacitor.
1d. The 470K reference resistor injects current into the
internal charge pump of the PLL, causing a fixed offset
between the outputs and the SYNC input. This also
prevents excessive jitter caused by inherent PLL
dead–band. If the VCO (2X_Q output) is running above
40MHz, the 470K resistor provides the correct amount of
current injection into the charge pump (2–3
μ
A). If the
VCO is running below 40MHz, a 1M
reference resistor
should be used (instead of 470K).
2. In addition to the bypass capacitors used in the analog
filter of Figure 6., there should be a 0.1
μ
F 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 88LV926 outputs, in
addition to reducing potential for noise in the ‘a(chǎn)nalog’
section of the chip. These bypass capacitors should also
be tied as close to the 88LV926 package as possible.
Figure 6. Recommended Loop Filter and Analog Isolation Scheme for the MC88LV926
47
BOARD VCC
0.1
μ
F (LOOP
FILTER CAP)
330
470K
0.1
μ
F HIGH
FREQ BIAS
10
μ
F LOW
FREQ BIAS
47
BOARD GND
5
6
7
ANALOG VCC
RC1
ANALOG GND
ANALOG LOOP FILTER/VCO
SECTION OF THE MC88LV926
20–PIN SOIC PACKAGE (NOT
DRAWN TO SCALE)
A SEPARATE ANALOG POWER SUPPLY IS NOT NECESSARY AND
SHOULD NOT BE USED. FOLLOWING THESE PRESCRIBED GUIDE-
LINES IS ALL THAT IS NECESSARY TO USE THE MC88LV926 IN A NOR-
MAL DIGITAL ENVIRONMENT.
NOTE: FURTHER LOOP OPTIMIZATION MAY OCCUR
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| MC88LV926DW | LOW SKEW CMOS PLL 68060 CLOCK DRIVER |
| MC88PL117 | CMOS PLL CLOCK DRIVER |
| MC88PL117FN | CMOS PLL CLOCK DRIVER |
| MC8T13 | DUAL LINE DRIVERS SILICON MONOLITHIC INTEGRATED CIRCUIT |
| MC8T23 | DUAL LINE DRIVERS SILICON MONOLITHIC INTEGRATED CIRCUIT |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MC88LV926DW | 制造商:Integrated Device Technology Inc 功能描述:IDT MC88LV926DW PLL - Rail/Tube 制造商:Motorola Inc 功能描述: 制造商:Motorola Inc 功能描述:FIVE DISTRIBUTED-OUTPUT CLOCK DRIVER, 20 Pin, Plastic, SOP |
| MC88LV926DWR2 | 功能描述:IC DRIVER CLK PLL 66MHZ 20-SOIC RoHS:否 類(lèi)別:集成電路 (IC) >> 時(shí)鐘/計(jì)時(shí) - 專(zhuān)用 系列:- 標(biāo)準(zhǔn)包裝:1,500 系列:- 類(lèi)型:時(shí)鐘緩沖器/驅(qū)動(dòng)器 PLL:是 主要目的:- 輸入:- 輸出:- 電路數(shù):- 比率 - 輸入:輸出:- 差分 - 輸入:輸出:- 頻率 - 最大:- 電源電壓:3.3V 工作溫度:0°C ~ 70°C 安裝類(lèi)型:表面貼裝 封裝/外殼:28-SSOP（0.209"，5.30mm 寬） 供應(yīng)商設(shè)備封裝:28-SSOP 包裝:帶卷 (TR) 其它名稱(chēng):93786AFT |
| MC88LV926EG | 功能描述:IC PLL CLOCK DRIVER 20-SOIC RoHS:是 類(lèi)別:集成電路 (IC) >> 時(shí)鐘/計(jì)時(shí) - 專(zhuān)用 系列:- 標(biāo)準(zhǔn)包裝:1,500 系列:- 類(lèi)型:時(shí)鐘緩沖器/驅(qū)動(dòng)器 PLL:是 主要目的:- 輸入:- 輸出:- 電路數(shù):- 比率 - 輸入:輸出:- 差分 - 輸入:輸出:- 頻率 - 最大:- 電源電壓:3.3V 工作溫度:0°C ~ 70°C 安裝類(lèi)型:表面貼裝 封裝/外殼:28-SSOP（0.209"，5.30mm 寬） 供應(yīng)商設(shè)備封裝:28-SSOP 包裝:帶卷 (TR) 其它名稱(chēng):93786AFT |
| MC88LV926EGR2 | 功能描述:IC PLL CLOCK DRIVER 20-SOIC RoHS:是 類(lèi)別:集成電路 (IC) >> 時(shí)鐘/計(jì)時(shí) - 專(zhuān)用 系列:- 標(biāo)準(zhǔn)包裝:1,500 系列:- 類(lèi)型:時(shí)鐘緩沖器/驅(qū)動(dòng)器 PLL:是 主要目的:- 輸入:- 輸出:- 電路數(shù):- 比率 - 輸入:輸出:- 差分 - 輸入:輸出:- 頻率 - 最大:- 電源電壓:3.3V 工作溫度:0°C ~ 70°C 安裝類(lèi)型:表面貼裝 封裝/外殼:28-SSOP（0.209"，5.30mm 寬） 供應(yīng)商設(shè)備封裝:28-SSOP 包裝:帶卷 (TR) 其它名稱(chēng):93786AFT |
| MC88PL117 | 制造商:MOTOROLA 制造商全稱(chēng):Motorola, Inc 功能描述:CMOS PLL CLOCK DRIVER |
發(fā)布緊急采購(gòu)，3分鐘左右您將得到回復(fù)。