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XRK4991AIJ-5 PDF预览

XRK4991AIJ-5

更新时间: 2024-11-02 03:13:51
品牌 Logo 应用领域
艾科嘉 - EXAR 时钟
页数 文件大小 规格书
13页 326K
描述
3.3V HIGH-SPEED (85 MHZ) PROGRAMMABLE SKEW CLOCK BUFFER

XRK4991AIJ-5 技术参数

是否Rohs认证: 不符合生命周期:Obsolete
零件包装代码:QFJ包装说明:QCCJ, LDCC32,.5X.6
针数:32Reach Compliance Code:compliant
HTS代码:8542.39.00.01风险等级:5.92
其他特性:ALSO OPERATES WITH 3.3V SUPPLY系列:4991
输入调节:STANDARDJESD-30 代码:R-PQCC-J32
JESD-609代码:e0长度:14 mm
逻辑集成电路类型:PLL BASED CLOCK DRIVER最大I(ol):0.012 A
功能数量:1反相输出次数:
端子数量:32实输出次数:8
最高工作温度:85 °C最低工作温度:-40 °C
封装主体材料:PLASTIC/EPOXY封装代码:QCCJ
封装等效代码:LDCC32,.5X.6封装形状:RECTANGULAR
封装形式:CHIP CARRIER峰值回流温度(摄氏度):215
电源:3.3 V认证状态:Not Qualified
Same Edge Skew-Max(tskwd):0.7 ns座面最大高度:3.56 mm
子类别:Clock Drivers最大供电电压 (Vsup):2.625 V
最小供电电压 (Vsup):2.375 V标称供电电压 (Vsup):2.5 V
表面贴装:YES温度等级:INDUSTRIAL
端子面层:Tin/Lead (Sn/Pb)端子形式:J BEND
端子节距:1.27 mm端子位置:QUAD
处于峰值回流温度下的最长时间:30宽度:11.465 mm
最小 fmax:100 MHzBase Number Matches:1

XRK4991AIJ-5 数据手册

 浏览型号XRK4991AIJ-5的Datasheet PDF文件第2页浏览型号XRK4991AIJ-5的Datasheet PDF文件第3页浏览型号XRK4991AIJ-5的Datasheet PDF文件第4页浏览型号XRK4991AIJ-5的Datasheet PDF文件第5页浏览型号XRK4991AIJ-5的Datasheet PDF文件第6页浏览型号XRK4991AIJ-5的Datasheet PDF文件第7页 
xr  
PRELIMINARY  
3.3V HIGH-SPEED (85 MHZ) PROGRAMMABLE SKEW CLOCK BUFFER  
XRK4991A  
FEBRUARY 2005  
REV.P1.0.2  
at the clock destination. This feature minimizes clock  
distribution difficulty while allowing maximum system  
clock speed and flexibility.  
FUNCTIONAL DESCRIPTION  
The XRK4991A 3.3V High-Speed Low-Voltage  
Programmable Skew Clock Buffer offers user  
selectable control over system clock functions to  
optimize the timing of high-performance computer  
systems. Eight individual drivers, arranged as four  
pairs of user-controllable outputs, can each drive  
terminated transmission lines with impedances as  
low as 50while delivering minimal and specified  
output skews and full-swing logic levels (LVTTL).  
FEATURES  
Ref input is 5V tolerant  
3 pairs of programmable skew outputs  
Low skew: 200ps same pair, 250ps all outputs  
Selectable  
positive  
or  
negative  
edge  
synchronization: Excellent for DSP applications  
Each output can be hardwired to one of nine delay or  
function configurations. Delay increments of 0.7 to  
1.5 ns are determined by the operating frequency  
with outputs able to skew up to ±6 time units from  
their nominal “zero” skew position. The completely  
integrated PLL allows external load and transmission  
line delay effects to be canceled. When this “zero  
delay” capability is combined with the selectable  
output skew functions, the user can create output-to-  
output delays of up to ±12 time units.  
Synchronous output enable  
Output frequency: 3.75MHz to 85MHz  
2x, 4x, 1/2, and 1/4 outputs  
2 skew grades  
3-level inputs for skew and PLL range control  
PLL bypass for DC testing  
External feedback, internal loop filter  
12mA balanced drive outputs  
32-pin PLCC package  
Jitter < 200 ps peak-to-peak (< 25 ps RMS)  
Green packaging  
Divide-by-two and divide-by-four output functions are  
provided for additional flexibility in designing complex  
clock systems. When combined with the internal PLL,  
these divide functions allow distribution of a low-  
frequency clock that can be multiplied by two or four  
FIGURE 1. BLOCK DIAGRAM OF THE XRK4991A  
TEST  
PE  
FB_IN  
PHASE  
FREQ  
DET  
VCO AND TIME  
UNIT GENERATOR  
FILTER  
CLKIN  
FSEL  
0E  
QD0  
QD1  
SELD0  
SELD1  
Select Inputs  
SKEW  
QC0  
QC1  
SELC0  
SELC1  
SELECT  
QB0  
QB1  
SELB0  
SELB1  
MATRIX  
QA0  
QA1  
SELA0  
SELA1  
Exar Corporation 48720 Kato Road, Fremont CA, 94538 (510) 668-7000 FAX (510) 668-7017 www.exar.com  

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