ACS8514 Semtech Corporation, ACS8514 Datasheet

ACS8514

Manufacturer Part Number

ACS8514

Description

Synchronous Equipment Timing Source Partner IC for 2nd T4 Dpll, Accurate Monitoring & Input Extender

Manufacturer

Semtech Corporation

Datasheet

1.ACS8514.pdf (86 pages)

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The ACS8514 is an optional partner integrated circuit for

applications using the ACS8520/30. It adds an additional

BITS clock (T4 path) DPLL to a clock synchronization

system, for applications needing two T4 paths (e.g. to GR-253

figure 5-21).

An alternative use for this DPLL is as an input extender

such that the ACS8514 automatically selects one of 14

clock sources, its output then feeds the ACS8530/20

which can also select another 13 sources, giving a total

input selection range of 27 sources. An additional 13

sources can be added for each ACS8514 added.

An additional highly accurate phase and frequency monitor

is also available that can be used to carry out more

detailed analysis of standby clock reference sources. This

extra monitor is actually another DPLL which under

software control could be set to sequentially analyze each

input. It can check phase from 0.7º to 23000º and

frequency from 0.0003ppm to 80 ppm. An approximate

MTIE measurement could be calculated for each reference

input as an extra quality check.

Simultaneous activity and coarse frequency monitoring of

all input sources is performed in the same way as on the

ACS8520/30. These can be used to automatically qualify

and select sources for the extra T4 path or for input

selection for the ACS8520/30 when the ACS8514 is used

as an input extender.

Figure 1 Block Diagram of the ACS8514 SETS Buddy

Revision 3.00 April 2007 © Semtech Corp.

Description

Block Diagram

ADVANCED COMMS & SENSING

FINAL

Page 1

Features

Partner to the ACS8520 & ACS8530 for use in SONET

Minimum Clock (SMC) or SONET/SDH Equipment Clock

(SEC) applications, to provide :

One Extra independent T4 path for those systems being

designed to Figure 5-21 of Bellcore GR253

An additional DPLL for accurate phase, average phase,

frequency and average frequency measuring of any

clock source.

Phase measurement accuracy to 0.7 degrees.

Frequency measurement accuracy to 3x10

Aids in enhancing Phase Build-out performance to

absorb phase disturbances when switching between

noisy input sources, via s/w control

Provides the facility to have long term frequency

measuring and averaging for BOTH the main and any

standby clock source so that the holdover frequency is

always accurate for both main and standby clock

selections

Accepts 14 individual input reference clocks, all with

robust input clock source quality monitoring.

Microprocessor interface - Intel, Motorola, Serial,

Multiplexed, or boot from EPROM

IEEE 1149.1

Single 3.3 V operation. 5 V tolerant

Lead (Pb)-free version available (ACS8514T),

RoHS and WEEE compliant

Synchronous Equipment Timing Source Partner IC for

T4 DPLL, Accurate Monitoring & Input Extender

[5]

ACS8514 SETS Buddy

JTAG Boundary Scan

www.semtech.com

DATASHEET

[17]

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