參數(shù)資料
型號(hào): ICS307M-02ILFT
廠商: IDT, Integrated Device Technology Inc
文件頁數(shù): 7/10頁
文件大?。?/td> 0K
描述: IC CLOCK SOURCE PROGR 16-SOIC
標(biāo)準(zhǔn)包裝: 1
類型: 時(shí)鐘發(fā)生器
PLL: 帶旁路
輸入: 時(shí)鐘,晶體
輸出: LVCMOS
電路數(shù): 1
比率 - 輸入:輸出: 2:2
差分 - 輸入:輸出: 無/無
頻率 - 最大: 180MHz
除法器/乘法器: 是/無
電源電壓: 3 V ~ 5.5 V
工作溫度: -40°C ~ 85°C
安裝類型: 表面貼裝
封裝/外殼: 16-SOIC(0.154",3.90mm 寬)
供應(yīng)商設(shè)備封裝: 16-SOIC
包裝: 標(biāo)準(zhǔn)包裝
產(chǎn)品目錄頁面: 1251 (CN2011-ZH PDF)
其它名稱: 800-1797-6
ICS307-01/-02
SERIALLY PROGRAMMABLE CLOCK SOURCE
SER PROG CLOCK SYNTHESIZER
IDT / ICS SERIALLY PROGRAMMABLE CLOCK SOURCE
6
ICS307-01/-02 REV J 051310
Programming Example
To generate 66.66 MHz from a 14.31818 MHz input, the RDW should be 59, the VDW should be 276, and
the Output Divide is 2. Selecting the minimum internal load capacitance, CMOS duty cycle, and CLK2 to be
OFF means that the following three bytes are sent to the ICS307:
As show in Figure 2, after these 24 bits are clocked into the ICS307, taking STROBE high will send this
data to the internal latch and the CLK output will lock within 10 ms.
Note: If STROBE is in the high state and SCLK is pulsed, DATA is clocked directly to the internal latch and
the output conditions will change accordingly. Although this will not damage the ICS307, it is recommended
that STROBE be kept low while DATA is being clocked into the ICS307 in order to avoid unintended
changes on the output clocks.
AC Parameters for Writing to the ICS307
External Components/Crystal Selection
The ICS307 requires a 0.01
F decoupling capacitor to be connected between VDD and GND. It must be connected
close to the ICS307 to minimize lead inductance. A 33
terminating resistor can be used in series with CLK1 and
CLK2 outputs. A parallel resonant, fundamental mode crystal with a load (correlation) capacitance of C should be
used, where C is the value calculated from Table 4. For crystals with a specified load capacitance greater than C,
additional crystal capacitors may be connected from each of the pins X1 and X2 to ground as shown in the Block
Diagram on page 1. The value (in pF) of these crystal caps should be = (CL-C)*2, where CL is the crystal load
capacitance in pF and C is the capacitance value from Table 4. These external capacitors are only required for
applications where the exact frequency is critical. For a clock input, connect to X1 and leave X2 unconnected (no
capacitors on either pin).
00110001
10001010
00111011
Byte 1
Byte 2
Byte 3
Parameter
Condition
Min.
Max.
Units
tSETUP
Setup time
10
ns
tHOLD
Hold time after SCLK
10
ns
tW
Data wait time
10
ns
tS
Strobe pulse width
40
ns
SCLK Frequency
50
MHz
DATA
F1
TTL
C0
C1
R1
R0
t
hold
t
setup
SCLK
STROBE
t
s
t
w
Figure 2. Timing Diagram for Programming the ICS307
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