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ACS8525LC

更新时间: 2024-02-11 22:03:11
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商升特 - SEMTECH 开关
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112页 1904K
描述
Line Card Protection Switch for SONET/SDH Systems

ACS8525LC 数据手册

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ACS8525 LC/P  
Line Card Protection Switch for  
SONET/SDH Systems  
ADVANCED COMMUNICATIONS  
Description  
FINAL  
Features  
DATASHEET  
The ACS8525 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  
ACS8525 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.  
‹ SONET/SDH applications up to OC-3/STM-1 bit rates  
‹ 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  
The ACS8525 can perform frequency translation,  
converting, for example, an 8 kHz SEC input clock from a  
backplane into a 155.52 MHz clock for local line cards.  
‹ Frequency translation of SEC input clock to a different  
local line card clock  
‹ Robust input clock source activity monitoring on all  
Master and Slave SEC inputs to the device support  
TTL/CMOS and PECL/LVDS. The Stand-by SEC and three  
Sync inputs are TTL/CMOS only.  
inputs  
‹ Supports Free-run, Locked and Digital Holdover  
modes of operation  
The ACS8525 generates two SEC clock outputs, via one  
PECL/LVDS and one TTL/CMOS port, with spot  
‹ Automatic “Hit-less” source switchover on loss of  
input  
frequencies from 2 kHz up to 311.04 MHz (up to 155.52  
MHz on the TTL/CMOS port). It also provides an 8 kHz  
Frame Sync and a 2 kHz Multi-Frame Sync signal output  
with programmable pulse width and polarity.  
‹ External force fast switch between SEC1/SEC2 inputs  
‹ Phase Build-out for output clock phase continuity  
during input switchover  
‹ PLL “Locked” and “Acquisition” bandwidths  
The ACS8525 includes a Serial Port, which can be SPI  
compatible, providing access to the configuration and  
status registers for device setup.  
individually selectable from 18, 35 or 70 Hz  
‹ Serial interface for device set-up  
‹ Single 3.3 V operation, 5 V I/O compatible  
‹ Operating temperature (ambient) of -40 to +85°C  
‹ Available in LQFP 64 package  
IEEE 1149.1 JTAG Boundary Scan is supported.  
‹ Lead (Pb)-free version available (ACS8525T), RoHS  
Block Diagram  
and WEEE compliant  
Figure 1 Block Diagram of the ACS8525 LC/P  
3 x SEC/Sync Input Groups  
SEC1 & SEC2:  
TTL/PECL/LVDS,  
SEC3 and all Syncs  
SEC Outputs:  
DPLL1  
DPLL2  
TTL only  
SEC1  
01 (PECL/LVDS)  
Master  
Slave  
MUX  
2
Input  
SEC Port  
Monitors  
and  
Input  
Selection  
Control  
APLL2  
SYNC1  
02 (TTL)  
Output  
Port  
Frequency  
Selection  
SEC2  
Digital Feedback  
APLL3  
Selector  
SYNC2  
Sync Outputs:  
E1/DS1  
Synthesis  
MFrSync 2 kHz (TTL)  
SEC3  
MUX  
1
APLL 1  
Stand-by  
FrSync 8 kHz (TTL)  
SYNC3  
01 and 02:  
SEC Inputs:  
Programmable  
Frequencies  
2 kHz, 4 kHz,  
N x 8 kHz  
E1/DS1 (2.048/1.544 MHz)  
and frequency multiples:  
1.5x, 2x, 3x, 4x, 6x, 12x,  
16x, and 24x E1/DS1  
TCK  
TDI  
TMS  
TRST  
TDO  
Chip  
Clock  
Generator  
IEEE  
1149.1  
JTAG  
E3/DS3, 2 kHz, 8 kHz.  
Priority  
Table  
Serial Interface  
Port  
1.544/2.048 MHz  
6.48 MHz  
Register Set  
and OC-N* rates: OC-1 51.84 MHz  
OC-3 155.52 MHz and derivatives:  
6.48 MHz (O2 port only)  
19.44 MHz, 25.92 MHz,  
38.88 MHz, 51.84 MHz, 77.76 MHz,  
155.52 MHz (01 port only)  
311.04 MHz (01 port only)  
19.44 MHz  
25.92 MHz  
38.88 MHz  
51.84 MHz  
77.76 MHz  
TCXO or  
XO  
155.52 MHz  
F8525D_001BLOCKDIA_05  
Revision 3.01/August 2005 © Semtech Corp.  
Page1  
www.semtech.com  

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