STC3800
INTEGRATED - STRATUM 3E
TIMING SOURCE
2111 Comprehensive Drive
Aurora, Illinois 60505
Phone: 630- 851- 4722
Fax: 630- 851- 5040
www.conwin.com
Description
The STC3800 is an integrated single chip
solution for the Synchronous Timing Source
in SONET/SDH network elements. The
device generates four synchronous clocks,
including BITS, and is fully compliant with
Telcordia GR-1244-CORE, GR-253-CORE
and ITU-T G.812/G.813.
The STC3800 can operate in Free Run,
locked or Hold Over mode. In the Free Run
mode, it locks on an OCXO or TCXO. In the
locked mode, it locks on one of 8 input
reference clocks. The frequency of each
input reference clock can be user selected
or automatically detected by the device. The
active reference can be automatically
selected by the device based on a priority
table or manually controlled by the user. All
reference switches are hit-less. In Hold Over
mode, the device generates outputs based
on the frequency history of the last locked
reference.
The STC3800 supports the Master or
Slave mode of operation for redundant
designs. In master mode, the device
operates in Free Run, locked or Hold Over.
In slave mode, the output clocks are locked
to the master’s primary Sync_Clk or 8 kHz
synchronous clock output and are phase
offset adjustable.
Parallel or serial bus interfaces are
provided to access STC3800 internal control
and status registers. Major operations can
be performed from either the bus interface or
external hardwire pins.
Features
•
Complies with Telcordia GR-1244-CORE,
GR-253-CORE, and ITU-T G.812/G.813
•
Supports Master/Slave operation
•
Supports Free Run, locked, and Hold Over
modes
•
Accepts 8 reference inputs and one cross
reference each from 8 kHz to 77.76 MHz
•
Continuous input reference quality monitoring
•
Input reference frequency are automatically
detected
•
Automatic or manual selection for active reference
•
Supports hardwire pins to select active reference
•
Four output signals: one selectable up to 155.52
MHz, one fixed at 8 kHz, one multi-frame sync
fixed at 2 kHz, and 1.544 MHz or 2.048 MHz
BITS output
•
Output phase is adjustable in slave mode
•
Frequency ramp control during reference switching
•
Hit-less reference switching
•
Better than 1 ppb Hold Over accuracy
•
Configurable bandwidth filter for Stratum 3 or 3E
•
Supports SPI and 8-bit parallel bus interface
•
IEEE 1149.1 JTAG boundary scan
•
Available in FBGA144 package
Functional Block Diagram
OCXO/TCXO
12.8 MHz
Xref
Ref1-8
Reset
M/S
HM_Ref
Sel0-3
EEPROM
3
DAC
3
VCXO
8
Reference Input Monitor
Sync_Clk
Sync_8K
Sync_2K
DPLL
APLL
BITS_Clk
4
Bulletin
Page
Revision
Date
TM061
1 of 48
P06
22 NOV 04
Control
Mode
BITS_Sel
VC_Sel
Bmode
Dmode
CS
ALE/SCLK
RW/SDI
RDY/SDO
AD0-7
INTR
Reference
Selection
Reference Priority,
Revertivity and Mask
Table
LOS
LOL
Hold_Avail
8
Bus Interface
STC3800
CONNOR-WINFIELD [ CONNOR-WINFIELD CORPORATION ]
