CONNOR-WINFIELD MSTM-S3-T2-FD

THE CONNOR-WINFIELD CORP.
Stratum 3 Simplified Control
Timing Modules (MSTM-S3-T2-FD)
Fig. 1.0
DESCRIPTION
The Connor-Winfield Stratum 3 Miniature Simplified
Control Timing Module acts as a complete system clock module for
general Stratum 3 timing applications. The MSTM is designed for
external control functions. Full external control input allows for
selections and monitoring of any of four possible operating states: 1)
Holdover, 2) External Reference #1, 3) External Reference #2, and 4)
Free Run. The table below illustrates the control signal inputs and
corresponding operational states:
In the absence of External Control Inputs (A,B), the MSTM
enters the Free Run mode and signals an External Alarm. The
MSTM will enter other operating modes upon application of a proper
control signal. Mode 1 operation (A=1, B=0) results in an output
signal that is phase locked to the External Reference Input #1. Mode
2 operation (A=0, B=1) results in an output signal that is phase
locked to External Reference Input #2. Holdover mode operation
(A=1, B=1) results in an output signal at or near the frequency as
determined by the latest (last) locked-signal input values and the
holdover performance of the MSTM.
The primary feature of this model is the Reference
Frequency Detector (RFD). This is an independent circuit that
monitors both reference inputs simultaneously to determine that a
signal is present and its frequency is within a valid range. A logical
one on the outputs VALID_R1 and VALID_R2 indicates that the
signals applied to EX_REF1 and EX_REF2 respectively have been
detected and have a frequency that is within at least +/- 4.6 ppm of
nominal. A range of +/-4.6 ppm is guaranteed for the life of the
module. The actual range is somewhat more than twice that to
account for normal drift and aging that will occur. When, for
example, the reference applied to EX_REF1 disappears, VALID_R1
will go to a logical zero within 500 microseconds. When the signal
returns at a frequency within +/- 4.6 ppm of nominal the VALID_R1
output will return to a logical one after a 4-second delay. The delay
is a validation period that requires the output of the frequency
detector to remain stable for 4 seconds before confirming the status
of the reference applied. This eliminates the incessant toggling of
the frequency detector that occurs when the reference frequency is at
the threshold frequency of the detector
MSTM-S3-T2-FD
PIN ASSIGNMENT
S0
S1
VALID_R1
VALID_R2
GND
+5Vdc
EX REF 1
GND
EX REF 2
GND
CLK_OUT
GND
SYNC_OUT
GND
CNTL A
CNTL B
A1
BOTTOM VIEW
Fig. 2.0
BLOCK DIAGRAM
CNTL A
CNTL B
0
1
S0
S1
TCXO
R1-CHK
EX REF 1
VALID_R1
R2-CHK
EX REF 2
The function of the RFD is not related to the operational alarms,
LOL and TVL, which monitor the operation of the PLL relative to
the selected active reference. In fact the operational alarms function
only at the extreme edge of the PLL operating range. This means that it is quite possible for the active reference to drift out of range of the Reference
Frequency Detector and still remain well within the capture range of the PLL and not activate the operational alarms. If the other reference was still
marked valid by the RFD it might make sense to switch to the better reference before the selected reference drifts completely out of range.
Alarm signals are generated at the Alarm Output during Holdover and Free Run operation. Alarm Signals are also generated by loss-of-lock,
loss of Reference, and by a Tune-Limit indication from the PLL. A Tune-Limit alarm signal indicates that the OCXO tuning voltage is approaching
within 10% the limits of its lock capability and that the External Reference Input may be erroneous. A high level indicates an alarm condition. Realtime indication of the operational mode is available from outputs S0 and S1, which are determined from internal mode registers.
Control loop filters effectively attenuate any reference jitter and smooth out phase transients.
DATA SHEET #: tm023
REV. A02
DATE: 10/24/01
Page 1 of 8
Specifications are subject to change without notice
FILENAME: MSTMS3T2FD.DOC
Copyright 2001 Connor-Winfield all rights reserved
THE CONNOR-WINFIELD CORP.
Stratum 3 Simplified Control
Timing Modules (MSTM-S3-T2-FD)
Table 1.0
CONTROL INPUT
A
B
0
0
1
0
0
1
1
1
OPERATIONAL MODE
Alarm Outputs
A0
0
0
1
0
1
0
1
0
1
0
Free Run (Default)
External
Normal
Reference #1
TVL
(While locked
LOR
to Valid Ref)
LOL (>17 ppm)
External
Normal
Reference #2
TVL
(While locked
LOR
to Valid Ref)
LOL (>17 ppm)
Holdover
State Outputs
A1
0
0
0
1
1
0
0
1
1
0
S0
0
1
1
1
1
0
0
0
0
1
S1
0
0
0
0
0
1
1
1
1
1
Table 2.0
Qualification Outputs
Condition
Ref 1 Within ± 4.6ppm
VALID_R1
1
VALID_R2
X
Ref 1 > ± 4.6 ppm
0
X
X
Ref 1 (No Signal)
0
Ref 2 Within ± 4.6 ppm
X
1
Ref 2 > ± 4.6 ppm
X
0
Ref 2 (No Signal)
X
0
Fig. 3.0
BLOCK DIAGRAM
5 VOLT DC
POWER
SUPPLY
+5Vdc
NETWORK
TIMING
REFERENCE
INPUT
eg. BITS CLOCK, etc.
EX REF 1
VALID_R1
EX REF 2
VALID_R2
CLK_OUT
SYSTEM CLOCK
S1
GND
GND
FREE RUN
CLOCK COPY
S0
GND
A0
GND
CNTL A
SYNC_OUT
CNTL B
GND
SYSTEM
CONTROL
AND DATA
INPUTS
A1
LOSS OF
REFERENCE
MONITOR
SECTION
DATA SHEET #: tm023
REV. A02
DATE: 10/24/01
Page 2 of 8
Specifications are subject to change without notice
FILENAME: MSTMS3T2FD.DOC
Copyright 2001 Connor-Winfield all rights reserved
THE CONNOR-WINFIELD CORP.
Stratum 3 Simplified Control
Timing Modules (MSTM-S3-T2-FD)
Fig. 4.0
1µ
µ sTransient Profile
1200
1000
TIE (ns)
800
600
400
200
0
-200 50
60
70
80
90
100
T ime (s)
Fig 5.0
Sample Wander Generation (TDEV) for STM/MSTM-S3
1. 0E -6
100. 0E -9
TDEV (sec)
10. 0E -9
TDEV
1. 0E -9
GR1244-Fig5.1
GR1244-Fig5-3
100. 0E -12
10. 0E -3
100. 0E -3
1. 0E +0
Integration Time (sec)
DATA SHEET #: tm023
REV. A02
DATE: 10/24/01
Page 3 of 8
10. 0E +0
100. 0E +0
1. 0E +3
Copyright 1998 Connor-Winfield alll rights reserved
Specifications are subject to change without notice
FILENAME: MSTMS3T2FD.DOC
Copyright 2001 Connor-Winfield all rights reserved
THE CONNOR-WINFIELD CORP.
Stratum 3 Simplified Control
Timing Modules (MSTM-S3-T2-FD)
Fig. 6.0
S am ple M TIE Data for STM -S3/M S TM -S3
1 .0E-6
MTIE (s)
100 .0E-9
MT IE
10 .0E-9
1244-5.2 M ask (A )
1244-5.2 M ask (B )
1244-5.6 M ask
G R253-5.4.4.3.2
1 .0E-9
10 0.0E-3
1.0 E+0
1 0.0 E+0
1 00.0 E+0
O b servation Tim e (s)
1.0E+ 3
1 0.0E+ 3
Copyright 1998 Connor-W infie ld all rig hts rese rved
Fig. 7.0
CURRENT DRAW
MSTM-S3-T2-FD
0.45
0.4
0.35
CURRENT (A)
0.3
0.25
0.2
0.15
0.1
0.05
0
0
10
20
30
TIME (S
DATA SHEET #: tm023
REV. A02
DATE: 10/24/01
Page 4 of 8
40
50
60
)
Specifications are subject to change without notice
FILENAME: MSTMS3T2FD.DOC
Copyright 2001 Connor-Winfield all rights reserved
THE CONNOR-WINFIELD CORP.
Stratum 3 Simplified Control
Timing Modules (MSTM-S3-T2-FD)
Table 3.0
VALID REFERENCE THRESHOLDS
MINIMUM
NOMINAL
±4.6 ppm
±9.2 ppm
±4.6 ppm
±9.2 ppm
VALID_R1
VALID_R2
MAXIMUM
±13.8 ppm
±13.8 ppm
Table 4.0
FREQUENCY DETECTOR RANGE OVER LIFETIME USE
DETECTOR
VALID_R1/R2
FREQUENCY
UNITS
RANGE
OFFSET
0
±9.2
ppm
+13.8
+4.6
ppm
-4.6
-4.6
+4.6
ppm
-13.8
Table 5.0
<-4.6 ppm
VALID_R1
VALID_R2
0
0
VALID
REFERENCE
1
1
>4.6 ppm
NO
REFERENCE
0
0
0
0
Fig. 8
Valid Reference Qualification Diagram
Reference Frequency Valid
Upper Limit
EX_REF 1
or
EX_REF 2
(Nominal Frequency)
Reference Frequency Valid
Lower Limit
Valid_R1
or
Valid_R2
4 sec
Delay
DATA SHEET #: tm023
REV. A02
DATE: 10/24/01
Page 5 of 8
375 usec - 500 usec
Delay on
LOR
Specifications are subject to change without notice
FILENAME: MSTMS3T2FD.DOC
Copyright 2001 Connor-Winfield all rights reserved
THE CONNOR-WINFIELD CORP.
Stratum 3 Simplified Control
Timing Modules (MSTM-S3-T2-FD)
TABLE 6.0
ABSOLUTE MAXIMUM RATING
SYMBOL
PARAMETER
MINIMUM
NOMINAL
VCC
Power supply voltage (Vcc to GND)
-0.5
5.0
VIN
Input voltage with respect to ground
-0.5
TSTG
Storage temperature
-65.0
TABLE 7.0
INPUT AND OUTPUT CHARACTERISTICS
SYMBOL
PARAMETER
MINIMUM
NOMINAL
VIH
High level input voltage
2.0
(TLL Compatible)
VIL
Low level input voltage
0
(TLL Compatible)
TIN
Input signal transition time
CIN
Input capacitance
VOH
High level output voltage
2.4
@ IOH=-8.0 mA, VCC minimum
VOL
Low level output voltage
@ IOH=8.0 mA, VCC maximum
THL
Clock out transition time high-to-low,
4.0
no load
TLH
Clock out transition time low-to-high,
4.0
no load
TRIP
Input 8 KHz reference signal positive
30
pulse width
TRIN
Input 8 KHz reference signal negative
30
pulse width
TOP
Standard Operating Temperature
0
TABLE 8.0
PARAMETER
Frequency Range (SYNC_OUT)
Frequency Range (CLK_OUT)
Supply Current
Timing Reference Inputs
Jitter and Phase Tolerance
Wander Generation
Free-Run Accuracy
Holdover Stability
Initial Offset
Temperature
Drift
Holdover History
Pull-in/ Hold-in Range
Lock Time
Correction Period
TVL Alarm
MAXIMUM
+7.0
Vcc+.05
+150.0
UNITS
Volts
Volts
Deg. C
NOTES
1.0
1.0
1.0
MAXIMUM
UNITS
NOTES
VCC
V
0.8
V
250
15
nS
pF
V
0.4
V
nS
nS
nS
nS
70
Deg. C
SPECIFICATIONS
19.44 MHz
19.44 MHz
See Fig. 7.0
8 KHz
Ref-GR-1244-CORE 4.2-4.4
Ref-GR-1244-CORE 5.3
±4.6 ppm
±0.37 ppm
0.05 ppm
0.28 ppm
0.04 ppm
30 seconds
±4.6 ppm Minimum
<100 secs
125 µS
Reference is nearing operational limit
DATA SHEET #: tm023
REV. A02
DATE: 10/24/01
Page 6 of 8
NOTES
2.0
3.0
4.0
5.0
6.0
Specifications are subject to change without notice
FILENAME: MSTMS3T2FD.DOC
Copyright 2001 Connor-Winfield all rights reserved
THE CONNOR-WINFIELD CORP.
Stratum 3 Simplified Control
Timing Modules (MSTM-S3-T2-FD)
PIN DESCRIPTIONS
Table 9.0
MSTMS3
PIN #
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
PIN NAME
S0
S1
VALID_R1
VALID_R2
Gnd
A0
CNTL A
CNTL B
A1
Gnd
SYNC_OUT
Gnd
CLK_OUT
Gnd
EX REF 2
Gnd
EX REF 1
+5 Vdc
PIN DESCRIPTION
State Output Bit 0
State Output Bit 1
Reference #1 Validation
Reference #2 Validation
Ground
Alarm Bit 0
Mode control input.
Mode control input.
Alarm Bit 1
Ground
Synchronized output.
Ground
Non-synchronized ±4.6 ppm Output
Ground
External Reference #2 Input. (8KHz)
Ground
Input. External Reference #1 Input. (8KHz)
+5 Volt DC Supply
Fig 8.0
MSTM-S3
PACKAGE
WITH COVER
DATA SHEET #: tm023
REV. A02
DATE: 10/24/01
Page 7 of 8
Specifications are subject to change without notice
FILENAME: MSTMS3T2FD.DOC
Copyright 2001 Connor-Winfield all rights reserved
THE CONNOR-WINFIELD CORP.
Stratum 3 Simplified Control
Timing Modules (MSTM-S3-T2-FD)
NOTES FOR TABLES 1-7
NOTES:
1.0
Operation of this device at these or any other conditions beyond those listed under Recommended Operating Conditions is not
implied. Exposure to Absolute Maximum Ratings conditions for extended periods of time may affect device reliability.
2.0
3.0
4.0
Consult factory for other frequencies.
REF-GR1244-CORE 3.2.1 R3-1.
Holdover stability is the cumulative fractional frequency offset containing Initial Offset, Temperature, and Drift
components as described by Bellcore GR-1244-CORE 5.2
Pull-in range is the minimum frequency deviation on the reference inputs to the timing module that can be overcome to
pull itself into synchronization with the reference.
See Table 1.0 for conditions of S0 and S1 outputs
5.0
6.0
DATA SHEET REVISION HISTORY
REVISION
A00
A01
A02
REVISION DATE
2/21/01
5/3/01
10/24/01
DATA SHEET #: tm023
REV. A02
DATE: 10/24/01
Page 8 of 8
NOTE
Advance Information Release
Added Table 3.0 and Fig. 8
Corrected Table 1.0
Specifications are subject to change without notice
FILENAME: MSTMS3T2FD.DOC
Copyright 2001 Connor-Winfield all rights reserved