器件名称:
SM8721AB
功能描述:
3-PLL Multi-Output Clock Generator
文件大小:
83.37KB 共8页
简 介:
SM8721AB 3-PLL Multi-Output Clock Generator OVERVIEW The SM8721AB is a clock generator IC with 3 built-in PLLs. It can simultaneously generate and output 3 clocks with different frequency derived from a single master clock. The generated output clock frequency can be switched using control pins and one clock can be turned ON/OFF (CLK2). The master clock can be selected from a low-cost 14.31818MHz or small 28.636363MHz crystal. The device is available in compact 20-pin QFN packages, making it ideal for portable digital still cameras and other applications which require multiple clocks. FEATURES I I I PINOUT (Top view) VDD1 VDD1 VSS1 CLK2ON CLK1 15 14 13 12 11 I I I I 3.0 to 3.6V supply voltage Crystal oscillator circuit built-in 14.318182/28.636363MHz master clock (internal PLL reference clock) Generated clocks 14.318182/17.734450MHz (REF_CLK) 71.877274/90.314686/96.016044 /114.54546MHz (CLK1) 48.008022/96.016044MHz (CLK2) Low jitter output 30ps typ. (1-sigma) 180ps typ. (peak-to-peak) Output load 15pF 20-pin QFN package (Pb free) CLK2 VSS2 VDD2 REF_CLK TEST2 16 17 18 19 20 1 2 3 4 5 10 9 8 7 6 FS1 FS2 FS3 XTAL_SEL TEST1 APPLICATIONS I PACKAGE DIMENSIONS (Unit: mm) Weight: 0.037g 4.20 ± 0.20 Digital still cameras ORDERING INFORMATION Device SM8721AB Package 4.20 ± 0.20 4.00 ± 0.10 4.00 ± 0.10 15 16 11 10 20-pin QFN 20 1 5 0.50 VDD3 VDD3 VSS3 XTI XTO 6 0.60 ± 0.10 + 0.03 0.02 0.02 0.05 0.22 ± 0.05 0.05 M SEIKO NPC CORPORATION —1 1.00max 0.22 ……
