參數(shù)資料
型號(hào): ICS843001AG-21LF
廠商: IDT, Integrated Device Technology Inc
文件頁(yè)數(shù): 3/17頁(yè)
文件大?。?/td> 0K
描述: IC SYNTHESIZER LVPECL 24-TSSOP
標(biāo)準(zhǔn)包裝: 62
系列: HiPerClockS™, FemtoClock™
類型: 頻率合成器
PLL: 帶旁路
輸入: 晶體
輸出: LVCMOS,LVPECL,LVTTL
電路數(shù): 1
比率 - 輸入:輸出: 2:2
差分 - 輸入:輸出: 無/是
頻率 - 最大: 700MHz
除法器/乘法器: 是/無
電源電壓: 3.135 V ~ 3.465 V
工作溫度: 0°C ~ 70°C
安裝類型: 表面貼裝
封裝/外殼: 24-TSSOP(0.173",4.40mm 寬)
供應(yīng)商設(shè)備封裝: 24-TSSOP
包裝: 管件
其它名稱: 800-2387-5
843001AG-21LF
ICS843001AG-21LF-ND
ICS843001-21
FEMTOCLOCKS CRYSTAL-TO-3.3V LVPECL FREQUENCY SYNTHESIZER
IDT / ICS LVPECL FREQUENCY SYNTHESIZER
11
ICS843001AG-21 REV. AMARCH 15, 2007
Recommendations for Unused Input and Output Pins
Inputs:
Crystal Inputs:
For applications not requiring the use of the crystal oscillator input,
both XTAL_IN and XTAL_OUT can be left floating. Though not
required, but for additional protection, a 1k
resistor can be tied
from XTAL_IN to ground.
TEST_CLK Input:
For applications not requiring the use of the test clock, it can be left
floating. Though not required, but for additional protection, a 1k
resistor can be tied from the TEST_CLK to ground.
LVCMOS Control Pins:
All control pins have internal pull-ups or pull-downs; additional
resistance is not required but can be added for additional
protection. A 1k
resistor can be used.
Outputs:
LVPECL Output:
All unused LVPECL outputs can be left floating. We recommend
that there is no trace attached. Both sides of the differential output
pair should either be left floating or terminated.
LVCMOS Output:
All unused LVCMOS output can be left floating. We recommend
that there is no trace attached.
Termination for 3.3V LVPECL Outputs
The clock layout topology shown below is a typical termination for
LVPECL outputs. The two different layouts mentioned are
recommended only as guidelines.
FOUT and FOUT are low impedance follower outputs that
generate ECL/LVPECL compatible outputs. Therefore, terminating
resistors (DC current path to ground) or current sources must be
used for functionality. These outputs are designed to drive 50
transmission lines. Matched impedance techniques should be
used to maximize operating frequency and minimize signal
distortion. Figures 4A and 4B show two different layouts which are
recommended only as guidelines. Other suitable clock layouts may
exist and it would be recommended that the board designers
simulate to guarantee compatibility across all printed circuit and
clock component process variations.
Figure 4A. 3.3V LVPECL Output Termination
Figure 4B. 3.3V LVPECL Output Termination
V
CC - 2V
50
50
RTT
Z
o = 50
Z
o = 50
FOUT
FIN
RTT =
Z
o
1
((V
OH + VOL) / (VCC – 2)) – 2
3.3V
125
125
84
84
Z
o = 50
Z
o = 50
FOUT
FIN
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