SY0006-8-19.44-2.048-M datasheet, PDF

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SY0006-8-19.44-2.048-M: DescriptionSupport Circuit, 1-Func,; CategoryWireless rf/communication Telecom circuit; File Size108KB，6 Pages; ManufacturerRaltron; Websitehttp://www.raltron.com/

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SY0006-8-19.44-2.048-M Overview

Support Circuit, 1-Func,

SY0006-8-19.44-2.048-M Parametric

Parameter Name	Attribute value
package instruction	,
Reach Compliance Code	compli
JESD-30 code	R-XDMA-P18
Number of functions	1
Number of terminals	18
Maximum operating temperature	70 °C
Minimum operating temperature	-20 °C
Package body material	UNSPECIFIED
Package shape	RECTANGULAR
Package form	MICROELECTRONIC ASSEMBLY
Certification status	Not Qualified
Nominal supply voltage	5 V
surface mount	NO
Telecom integrated circuit types	ATM/SONET/SDH SUPPORT CIRCUIT
Temperature level	COMMERCIAL
Terminal form	PIN/PEG
Terminal location	DUAL
Base Number Matches	1

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SYNCHRONOUS EQUIPMENT CLOCK

STRATUM 4 CLOCK UNIT – SY0006

Model SY0006

Date: August 1, 2000

PRELIMINARY

•

INTRODUCTION

The SY0006 is an accurate time and frequency source that has been designed as a module level subsystem. The

module is designed to work within ATM, SONET, SDH, and wireless systems where synchronization is vital. The

SY0006 is an excellent synchronization solution for timing, jitter and wander topics specified within ITU-T

Recommendations G.812, ETSI -ETS 300 462-4, and Bellcore GR-1244-CORE. The SY0006 is designed for

Stratum 4 applications.

•

FEATURES

A synchronization solution for timing, jitter and wander concerns in a single module.

Complies with ITU-T Recommendations G.812 and ETSI-ETS 300 462-4 and Bellcore GR-1244-CORE for

Stratum 4 applications.

Supports four modes of operation: Locked to Reference 1, Locked to Reference 2, Holdover and Free-run.

Accepts reference inputs from two independent sources from 8 kHz to 77.76 MHz.

Provides two outputs up to 77.76 MHz.

Loop filtering utilizing application specific software in the digital signal processor (DSP).

Continuously monitors and evaluate input reference signals.

Creates a history buffer for Holdover mode operation.

Manual or Automatic selection between timing modes.

Alarm and status signal.

Host interface and JTAG port.

Small dimensions of 2.0 x 2.0 x 0.75 inch.

•

APPLICATION

The SY0006 performs clock regeneration as a Synchronous Equipment Clock (SEC), or STRATUM 4 in ATM,

SDH, PDH, and SONET networks. It is designed for manufacturers of network equipment, especially Access

Switches, Core Switches, Cross Connects, Digital Multiplexers-Exchangers, and SDH/SONET equipment. The unit

is also suitable for PCS, WLL, and Wireless Base Stations. Wherever a Timing unit with high performance

specifications is required, the SY0006 can be integrated into the network system and provide all necessary

frequencies and interfaces. The input stage can receive two different input reference signals at various rates from

4 kHz to 77.76 MHz. An optional application can be achieved by integrating the SY0006 with a low cost GPS

receiver and locking it to the GPS 1 pps output signal.

RALTRON ELECTRONICS CORP.

10651 N.W.19 St

Florida 33172

U.S.A.

Tel: 305 593-6033

Fax: 305-594-3973

e-mail: sales@raltron.com

Internet: http:/www.raltron.com

SYNCHRONOUS EQUIPMENT CLOCK

STRATUM 4 CLOCK UNIT – SY0006

SCI

J-TAG

DSP

CPLD

EX REF1

EX REF2

DAC

VCXO

MUX

PD1

FLASH

RAM

CNT1

CNT2

CONTROL

LOGIC

ALARM OUT

PLL UNLOCK

HOLDOVER

REF 1

REF 2

FREE RUN

OUT

OUTPUT

FREQUENCY

CONVERTERS

OPT OUT

Figure 1. - The functional block diagram of SY0006

•

DESCRIPTION

The SY0006 synchronization module is a Digital PLL (DPLL), which utilizes application specific software in the

digital signal processor (DSP). The DSP is complemented by fast hardware logic (CPLD) where all multiplexers,

counters, dividers, phase detectors, output frequency converters and other control logic circuits are completely

implemented. The functional block diagram with maximum configuration is shown in figure 1. Depending on the

application, the user can specify an appropriate configuration to fit their system requirements. The basic

configuration utilizes one DPLL with a VCXO as on-board oscillator, shown in figure 1 as the shaded boxes. The

VCXO is driven by a digital-to-analog converter (DAC1) and provides the accurate and stable signal with less

power consumption. The output frequency converters scale the output frequency from the oscillator. For other

configurations, please contact Raltron.

The module operates in the following four timing modes:

Free-run

In this mode the unit is unlocked to either of the inputs. The accuracy of the output frequencies in this mode is

±32ppm. Free-run mode is typically used when a master clock source is required, not valid history of data for the

Holdover mode, or immediately following system power-up before network synchronization is achieved. In the

Free-run Mode, the SY0006 provides timing and synchronization signals that are based on the accuracy of on-

board oscillators only, and are not synchronized to the reference signals.

Holdover

In this mode the module has lost its reference inputs and is utilizing stored timing data, called history, to control the

output frequency. Holdover Mode is typically used while network synchronization is temporarily disrupted. In

Holdover Mode, the SY0006 provides timing, based on data from the history buffer, while unlocked to an external

reference signal. The history data is determined while the device is locked to an external reference signal. The

stability of the output signal in holdover mode depends primarily on the stability of on-board oscillator and

RALTRON ELECTRONICS CORP.

10651 N.W.19 St

Florida 33172

U.S.A.

Tel: 305 593-6033

Fax: 305-594-3973

e-mail: sales@raltron.com

Internet: http:/www.raltron.com

SYNCHRONOUS EQUIPMENT CLOCK

STRATUM 4 CLOCK UNIT – SY0006

environment effects where the clock is mounted. The SY0006 uses a VCXO as an on-board oscillator but other

types of oscillators are available.

Locked to Ref.1

In this mode the output of the module is phase locked to input reference 1.

Locked to Ref.2

In this mode the output of the module is phase locked to input reference 2.

The REF1 or REF2 Modes are typically used when a slave clock source is synchronized to the network. In these

modes, the SY0006 provides timing signals, which are synchronized, to one of two references inputs (REF1 or

REF2). The input reference signals may have a variety of nominal frequencies, which is typically specified by the

end user. When the modes are selected the unit goes through a reference evaluation, and then a frequency

acquisition, and finally to phase locking.

•

Input References

The SY0006 module accepts two input references EX REF1 and EX REF2. End users can specify the frequencies

within a range of 8 kHz to 77.76 MHz. The input reference signals are HCMOS/TTL levels with timing

characteristic in according to Bellcore GR-1244-core 3.2.1.R3-1 or equivalent standards. Please note that the end

user must specify the two input frequencies at the time of order.

•

Output Signals

The SY0006 module provides two output signals OUT and OPT OUT. The outputs are generated by the internal

oscillator and scaled by the output frequency converters. The performance of the module significantly depends on

the internal oscillator and special care was taken to define its specification. A Voltage Controlled Crystal Oscillator

(VCXO) is used as the internal oscillator. The frequency of the oscillator is specified according to the network

application where the SY0006 will be used. The frequency converters divide signal from the oscillator to the

specified frequencies.

RALTRON ELECTRONICS CORP.

10651 N.W.19 St

Florida 33172

U.S.A.

Tel: 305 593-6033

Fax: 305-594-3973

e-mail: sales@raltron.com

Internet: http:/www.raltron.com

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