參數(shù)資料
型號(hào): ICS853S013AMILF
廠商: IDT, Integrated Device Technology Inc
文件頁(yè)數(shù): 2/16頁(yè)
文件大?。?/td> 0K
描述: IC CLOCK BUFFER 1:3 2GHZ 20-SOIC
標(biāo)準(zhǔn)包裝: 74
類型: 扇出緩沖器(分配)
電路數(shù): 2
比率 - 輸入:輸出: 1:3
差分 - 輸入:輸出: 是/是
輸入: CML,LVDS,LVPECL,SSTL
輸出: ECL,PECL
頻率 - 最大: 2GHz
電源電壓: 2.375 V ~ 3.8 V
工作溫度: -40°C ~ 85°C
安裝類型: 表面貼裝
封裝/外殼: 20-SOIC(0.295",7.50mm 寬)
供應(yīng)商設(shè)備封裝: 20-SOIC
包裝: 管件
其它名稱: 800-2249
ICS853S013AMI REVISION A AUGUST 20, 2010
10
2010 Integrated Device Technology, Inc.
ICS853S013I Data Sheet
LOW SKEW, DUAL, 1-TO-3, DIFFERENTIAL-TO-2.5V, 3.3V LVPECL/ECL FANOUT BUFFER
Recommendations for Unused Output Pins
Inputs:
PCLKx/nPCLKx Inputs
For applications not requiring the use of a differential input, both the
PCLKx and nPCLKx pins can be left floating. Though not required,
but for additional protection, a 1k
resistor can be tied from PCLKx
to ground. For applications
Outputs:
LVPECL Outputs
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.
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.
The differential outputs 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 3A and 3B 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 3A. 3.3V LVPECL Output Termination
Figure 3B. 3.3V LVPECL Output Termination
3.3V
V
CC - 2V
R1
50
R2
50
RTT
Z
o = 50
Z
o = 50
+
_
RTT =
* Z
o
1
((V
OH + VOL) / (VCC – 2)) – 2
3.3V
LVPECL
Input
R1
84
R2
84
3.3V
R3
125
R4
125
Z
o = 50
Z
o = 50
LVPECL
Input
3.3V
+
_
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