参数资料
型号: ICS8S89834AKILFT
厂商: IDT, Integrated Device Technology Inc
文件页数: 2/17页
文件大小: 0K
描述: IC CLOCK MUX 2:4 1GHZ 16-VFQFN
标准包装: 2,500
系列: HiPerClockS™
类型: 多路复用器
电路数: 1
比率 - 输入:输出: 2:4
差分 - 输入:输出: 无/是
输入: LVCMOS,LVTTL
输出: ECL,LVPECL
频率 - 最大: 1GHz
电源电压: 2.375 V ~ 3.63 V
工作温度: -40°C ~ 85°C
安装类型: 表面贴装
封装/外壳: 16-VFQFN 裸露焊盘
供应商设备封装: 16-VFQFPN(3x3)
包装: 带卷 (TR)
ICS8S89834I Data Sheet
LOW SKEW, 2-TO-4 LVCMOS/LVTTL-TO-LVPECL/ECL CLOCK MULTIPLEXER
ICS8S89834AKI REVISION A FEBRUARY 4, 2010
10
2010 Integrated Device Technology, Inc.
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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