ACS8525A集成電路（IC）的應(yīng)用特定時鐘/定時規(guī)格書PDF中文資料

ACS8525A屬于集成電路（IC）的應(yīng)用特定時鐘/定時。由Semtech Corporation制造生產(chǎn)的ACS8525A應(yīng)用特定時鐘/定時專用時鐘和計時 IC（集成電路）產(chǎn)品族中的產(chǎn)品主要用于執(zhí)行與時間或頻率信息生成和分配相關(guān)的各種操作，適合的設(shè)計環(huán)境較特定，例如 AMD 和 Intel 的中央處理單元 (CPU) 或圖形處理單元 (GPU)、DVD 音頻設(shè)備、藍(lán)光光盤播放器、以太網(wǎng)設(shè)備、PCIe、SATA、光纖通道接口、車載娛樂總線等。

Description

The ACS8525A is a highly integrated, single-chip solution for “Hit-less” protection switching of SEC (SDH/SONET Equipment Clock) + Sync clock “Groups”, from Master and Slave SETS clock cards and a third (Stand-by) source,

for Line Cards in a SONET or SDH Network Element. The ACS8525A has fast activity monitors on the SEC clock

inputs and will implement automatic system protection switching against the Master clock failure. The selection

of the Master/Slave input can be forced by a Force Fast Switch pin. If both the Master and Slave input clocks fail, the Stand-by “Group” is selected or, if no Stand-by is available, the device enters Digital Holdover mode.

Features

◆? SONET/SDH applications up to OC-3/STM-1 bit rate.

?◆ Switches between grouped inputs (SEC/Sync pairs).

?◆ Inputs: three SECs at any of 2, 4, 8 kHz (and N x 8 kHz multiples up to 155.52 MHz), plus Frame Sync/Multi Frame Sync.

?◆ Outputs: two SEC clocks at any of several spot frequencies from 2 kHz up to 77.76 MHz via the TTL/CMOS port and up to 311.04 MHz via the PECL/LVDS port.

?◆ Selectable clock I/O port technologies.

◆? Modes for E3/DS3 and multiple E1/DS1 rate output clocks.

?◆ Frequency translation of SEC input clock to a different local line card clock.

?◆ Robust input clock source activity monitoring on all inputs.

?◆ Supports Free-run, Locked and Digital Holdover modes of operation.

?◆ Automatic “Hit-less” source switchover on loss of input.

?◆ External force fast switch between SEC1/SEC2 inputs.

?◆ Phase Build-out for output clock phase continuity during input switchover.

?◆ PLL “Locked” and “Acquisition” bandwidths individually selectable from 18, 35 or 70 Hz.

?◆ Serial interface for device set-up.

?◆ Single 3.3 V operation.

?◆ Operating temperature (ambient) of 0 to +70°C.

?◆ Available in LQFP 64 package.

?◆ Lead (Pb)-free version available (ACS8525T), RoHS and WEEE compliant.