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| 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 +5Vdc EX REF 1 GND EX REF 2 GND CLK_OUT GND SYNC_OUT GND S0 S1 VALID_R1 VALID_R2 GND CNTL A CNTL B A1 BOTTOM VIEW Fig. 2.0 BLOCK DIAGRAM CNTL A CNTL B 0 1 S0 S1 TCXO EX REF 1 R1-CHK 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 Specifications are subject to change without notice FILENAME: MSTMS3T2FD.DOC DATE: 10/24/01 Page 1 of 8 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 OPERATIONAL MODE 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 A0 0 0 1 0 1 0 1 0 1 0 Alarm Outputs A1 0 0 0 1 1 0 0 1 1 0 S0 0 1 1 1 1 0 0 0 0 1 State Outputs S1 0 0 0 0 0 1 1 1 1 1 0 1 1 1 Table 2.0 Condition Ref 1 Within 4.6ppm Ref 1 > 4.6 ppm Ref 1 (No Signal) Ref 2 Within 4.6 ppm Ref 2 > 4.6 ppm Ref 2 (No Signal) Qualification Outputs VALID_R1 1 0 0 X X X VALID_R2 X X X 1 0 0 Fig. 3.0 BLOCK DIAGRAM 5 VOLT DC POWER SUPPLY NETWORK TIMING REFERENCE INPUT eg. BITS CLOCK, etc. FREE RUN CLOCK COPY +5Vdc EX REF 1 GND EX REF 2 GND CLK_OUT GND S0 S1 VALID_R1 VALID_R2 GND A0 CNTL A CNTL B A1 SYSTEM CONTROL AND DATA INPUTS SYSTEM CLOCK SYNC_OUT GND LOSS OF REFERENCE MONITOR SECTION DATA SHEET #: tm023 REV. A02 Specifications are subject to change without notice FILENAME: MSTMS3T2FD.DOC DATE: 10/24/01 Page 2 of 8 Copyright 2001 Connor-Winfield all rights reserved THE CONNOR-WINFIELD CORP. Stratum 3 Simplified Control Timing Modules (MSTM-S3-T2-FD) Fig. 4.0 1 sTransient Profile 1200 1000 800 TIE (ns) 600 400 200 0 -200 50 60 70 T ime (s) Fig 5.0 80 90 100 Sample Wander Generation (TDEV) for STM/MSTM-S3 1. 0E -6 100. 0E -9 10. 0E -9 TDEV (sec) TDEV 1. 0E -9 GR1244-Fig5.1 GR1244-Fig5-3 100. 0E -12 10. 0E -3 100. 0E -3 1. 0E + 0 10. 0E + 0 100. 0E + 0 1. 0E + 3 Integration Time (sec) Copyright 1 998 Connor-Winfield alll rights reserved DATA SHEET #: tm023 REV. A02 Specifications are subject to change without notice FILENAME: MSTMS3T2FD.DOC DATE: 10/24/01 Page 3 of 8 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-6 100 .0E-9 MTIE (s) 10 .0E-9 MT IE 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 1.0E+ 3 1 0.0E+ 3 O b servation Tim e (s) 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 0.3 CURRENT (A) 0.25 0.2 0.15 0.1 0.05 0 0 10 20 30 TIME (S ) 40 50 60 DATA SHEET #: tm023 REV. A02 Specifications are subject to change without notice FILENAME: MSTMS3T2FD.DOC DATE: 10/24/01 Page 4 of 8 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 MAXIMUM 13.8 ppm 13.8 ppm VALID_R1 VALID_R2 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 NO <-4.6 ppm VALID_R1 VALID_R2 0 0 VALID REFERENCE 1 1 >4.6 ppm 0 0 REFERENCE 0 0 Fig. 8 Valid Reference Qualification Diagram Reference Frequency Valid Upper Limit EX_REF 1 or EX_REF 2 Reference Frequency Valid Lower Limit Valid_R1 or Valid_R2 (Nominal Frequency) 4 sec Delay 375 usec - 500 usec Delay on LOR DATA SHEET #: tm023 REV. A02 Specifications are subject to change without notice FILENAME: MSTMS3T2FD.DOC DATE: 10/24/01 Page 5 of 8 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 MAXIMUM +7.0 Vcc+.05 +150.0 UNITS Volts Volts Deg. C NOTES 1.0 1.0 1.0 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 MAXIMUM VCC 0.8 250 15 UNITS V V nS pF V NOTES 0.4 V nS nS nS nS 70 Deg. C 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 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 S Reference is nearing operational limit NOTES 2.0 3.0 4.0 5.0 6.0 DATA SHEET #: tm023 REV. A02 Specifications are subject to change without notice FILENAME: MSTMS3T2FD.DOC DATE: 10/24/01 Page 6 of 8 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 Specifications are subject to change without notice FILENAME: MSTMS3T2FD.DOC DATE: 10/24/01 Page 7 of 8 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 5.0 6.0 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 DATA SHEET REVISION HISTORY REVISION A00 A01 A02 REVISION DATE 2/21/01 5/3/01 10/24/01 NOTE Advance Information Release Added Table 3.0 and Fig. 8 Corrected Table 1.0 DATA SHEET #: tm023 REV. A02 Specifications are subject to change without notice FILENAME: MSTMS3T2FD.DOC DATE: 10/24/01 Page 8 of 8 Copyright 2001 Connor-Winfield all rights reserved |
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