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參數(shù)資料
| 型號： | ICS8432DYI-01LFT |
| 廠商： | INTEGRATED DEVICE TECHNOLOGY INC |
| 元件分類： | 時鐘產(chǎn)生/分配 |
| 英文描述： | 700 MHz, OTHER CLOCK GENERATOR, PQFP32 |
| 封裝： | 7 X 7 MM, 1.40 MM HEIGHT, MS-026, LQFP-32 |
| 文件頁數(shù)： | 10/17頁 |
| 文件大小： | 185K |
| 代理商： | ICS8432DYI-01LFT |
8432DYI-01
www.icst.com/products/hiperclocks.html
REV. B FEBRUARY 7, 2003
2
Integrated
Circuit
Systems, Inc.
ICS8432I-01
700MHZ, CRYSTAL-TO-3.3V DIFFERENTIAL
LVPECL FREQUENCY SYNTHESIZER
FUNCTIONAL DESCRIPTION
NOTE: The functional description that follows describes operation using a 25MHz crystal. Valid PLL loop divider values for
different crystal or input frequencies are defined in the Input Frequency Characteristics, Table 5, NOTE 1.
The ICS8432I-01 features a fully integrated PLL and therefore requires no external components for setting the loop band-
width. A fundamental crystal is used as the input to the on-chip oscillator. The output of the oscillator is fed into the phase
detector. A 25MHz crystal provides a 25MHz phase detector reference frequency. The VCO of the PLL operates over a range
of 200MHz to 700MHz. The output of the M divider is also applied to the phase detector.
The phase detector and the M divider force the VCO output frequency to be M times the reference frequency by adjusting the
VCO control voltage. Note that for some values of M (either too high or too low), the PLL will not achieve lock. The output of the
VCO is scaled by a divider prior to being sent to each of the LVPECL output buffers. The divider provides a 50% output duty cycle.
The programmable features of the ICS8432I-01 support two input modes to program the M divider and N output divider. The
two input operational modes are parallel and serial.
Figure 1 shows the timing diagram for each mode. In parallel mode, the
nP_LOAD input is initially LOW. The data on inputs M0 through M8 and N0 and N1 is passed directly to the M divider and
N output divider. On the LOW-to-HIGH transition of the nP_LOAD input, the data is latched and the M divider remains loaded
until the next LOW transition on nP_LOAD or until a serial event occurs. As a result, the M and N bits can be hardwired to set
the M divider and N output divider to a specific default state that will automatically occur during power-up. The TEST output is
LOW when operating in the parallel input mode. The relationship between the VCO frequency, the crystal frequency and the
M divider is defined as follows:
The M value and the required values of M0 through M8 are shown in Table 3B, Programmable VCO Frequency Function Table.
Valid M values for which the PLL will achieve lock for a 25MHz reference are defined as 8
≤ M ≤ 28. The frequency out is
defined as follows:
Serial operation occurs when nP_LOAD is HIGH and S_LOAD is LOW. The shift register is loaded by sampling the S_DATA
bits with the rising edge of S_CLOCK. The contents of the shift register are loaded into the M divider and N output divider when
S_LOAD transitions from LOW-to-HIGH. The M divide and N output divide values are latched on the HIGH-to-LOW transition
of S_LOAD. If S_LOAD is held HIGH, data at the S_DATA input is passed directly to the M divider and N output divider on each
rising edge of S_CLOCK. The serial mode can be used to program the M and N bits and test bits T1 and T0. The internal
registers T0 and T1 determine the state of the TEST output as follows:
fVCO = fxtal x M
T1
T0
TEST Output
0
LOW
0
1
S_Data, Shift Register Input
1
0
Output of M divider
1
CMOS Fout
FIGURE 1. PARALLEL & SERIAL LOAD OPERATIONS
*NOTE: The NULL timing slot must be observed.
Time
SERIAL LOADING
PARALLEL LOADING
M, N
t
S
t
H
t
S
t
H
t
S
T1
T0
*NULL
N 1
N 0
M8
M7
M6
M5
M4
M3
M2
M1
M 0
FOUT = fVCO = fxtal x M
N
S_CLOCK
S_DATA
S_LOAD
nP_LOAD
M0:M8, N0:N1
nP_LOAD
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相關(guān)代理商/技術(shù)參數(shù) |
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| ICS8432DYI-101 | 制造商:ICS 制造商全稱:ICS 功能描述:700MHZ, DIFFERENTIAL-TO-3.3V LVPECL FREQUENCY SYNTHESIZER |
| ICS8432DYI-101LF | 功能描述:IC SYNTHESIZER 700MHZ 32-LQFP RoHS:是 類別:集成電路 (IC) >> 時鐘/計時 - 時鐘發(fā)生器，PLL，頻率合成器 系列:HiPerClockS™ 標準包裝:1,000 系列:- 類型:時鐘/頻率合成器，扇出分配 PLL:- 輸入:- 輸出:- 電路數(shù):- 比率 - 輸入:輸出:- 差分 - 輸入:輸出:- 頻率 - 最大:- 除法器/乘法器:- 電源電壓:- 工作溫度:- 安裝類型:表面貼裝 封裝/外殼:56-VFQFN 裸露焊盤 供應商設(shè)備封裝:56-VFQFP-EP（8x8） 包裝:帶卷 (TR) 其它名稱:844S012AKI-01LFT |
| ICS8432DYI-101LFT | 功能描述:IC SYNTHESIZER 700MHZ 32-LQFP RoHS:是 類別:集成電路 (IC) >> 時鐘/計時 - 時鐘發(fā)生器，PLL，頻率合成器 系列:HiPerClockS™ 標準包裝:1,000 系列:- 類型:時鐘/頻率合成器，扇出分配 PLL:- 輸入:- 輸出:- 電路數(shù):- 比率 - 輸入:輸出:- 差分 - 輸入:輸出:- 頻率 - 最大:- 除法器/乘法器:- 電源電壓:- 工作溫度:- 安裝類型:表面貼裝 封裝/外殼:56-VFQFN 裸露焊盤 供應商設(shè)備封裝:56-VFQFP-EP（8x8） 包裝:帶卷 (TR) 其它名稱:844S012AKI-01LFT |
| ICS8432DYI-101T | 制造商:ICS 制造商全稱:ICS 功能描述:700MHZ, DIFFERENTIAL-TO-3.3V LVPECL FREQUENCY SYNTHESIZER |
| ICS8432I-101 | 制造商:ICS 制造商全稱:ICS 功能描述:700MHZ, DIFFERENTIAL-TO-3.3V LVPECL FREQUENCY SYNTHESIZER |
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