描述 Description

The ZL40255 SmartBuffer??is a flexible, programmable fanout buffer IC. The ZL40255 can select from 1 of 4 input clocks and provide as many as 3 differential or 6 CMOS outputs. Each output can provide format conversion, integer frequency division, and skew adjustment. Flexible any-format outputs simplify design.?Automatic self-configuration after power-up or reset.

特性 Features

Four Input Clocks: one crystal/CMOS input, two differential/CMOS inputs, one single-ended/CMOS input
Any input frequency up to 1035MHz (up to 300MHz for CMOS)
Clock selection by pin or register control
Up to 3 Differential Outputs (Up to 6 CMOS)
Output frequencies are any integer divisor up to 232 of the input frequency (CMOS 250MHz max)
Each output has independent dividers
Low additive jitter Outputs are CML or 2xCMOS, can interface to LVDS, LVPECL, HSTL, SSTL and HCSL
In 2xCMOS mode, the P and N pins can be different frequencies (e.g. 125MHz and 25MHz)
Per-output supply pin with CMOS output voltages from 1.5V to 3.3V
Precise output alignment circuitry and per-output phase adjustment
Per-output enable/disable and glitch-less start/stop (stop high or low)
Automatic self-configuration at power-up from internal EEPROM; up to four configurations, pin-selectable
Crystal interface for frequency synthesis up to 60MHz
Four general-purpose I/O pins, each with many status and control options
SPI or I2C processor Interface
Tiny 5x5mm QFN package

簡介

ZL40255屬于集成電路（IC）的時鐘緩沖器驅動器。由制造生產的ZL40255時鐘緩沖器，驅動器時鐘緩沖器和驅動器集成電路產品族中的產品用于幫助信號在系統(tǒng)中傳輸，常用作頻率/時間參考信號，以同步系統(tǒng)內的活動。盡管這些器件最常用到的功能就是緩沖（即，為使信號不受驅動負載的影響而從某個信號源復制信號），但是該產品族中的某些器件還能執(zhí)行其他功能，例如選擇性改變緩沖信號路徑、按某個整數(shù)值分割信號頻率，或進行所用電信號格式轉換。