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CM55

Small size, Low height, Holdover better than ±1.5us/24h(△T=±10℃);
Application: Power grid, Clock reference, Base station, High precise server etc.


Feature:
1.5μs holdover for 24 hrs, ultra thin, high cost effective, applied to a relatively stable temperature environment
 
 

 
 
1 PPS
Reference input
ParametersMin.Typ.Max.Unit.Test Condition
WaveformHCMOS    
High-level Output Voltage2.7    V  
50Ω
Low-level Output Voltage    0.4V
Pulse Width10    μs
ConnectorPin 10  

 

 
State input		ParametersMin.Typ.Max.Unit.Test Condition
Lock2.7    V<5mA Load
Holdover    0.4V<5mA Load
ConnectorPin 8  

 

 
 
 
 
 
 
RF Output
ParametersMin.Typ.Max.Unit.Test Condition
Frequency  10  MHz  
WaveformHCMOS  
High-level Output Voltage2.7    V<5mA Load
Low-level Output Voltage    0.4V<5mA Load
Rise/Fall Time    8ns<5mA Load
Duty Cycle455055%<5mA Load
Accuracy-1  +1E-1224 hours average when lock to 1 PPS
Short-term stability  2  E-11Temperature stability, no EMI/EMC or other interference, test after power for 1 hour ref. to 25℃; 1s, using PN9000 equipment
Aging Tolerance Per Day-2  +2E-10Vcc, TA constant measurement referenced to frequency observed with TA=2525℃, Vcc=5.0V, in FREE RUN condition and after 30 days of operation.
Aging Tolerance Per Year-1  +1E-8
 
 
 
Phase noise		  -118  dBc/Hz@10Hz offset
 -138  dBc/Hz@100Hz offset
 -148  dBc/Hz@1KHz offset
 -150  dBc/Hz@10KHz offset
 -150  dBc/Hz@100KHz offset
 -150  dBc/Hz@1MHz offset
ConnectorPin 14  
Holdover CapabilityHoldover TimeMin.Typ.Max.Unit.Test Condition
24 hours-1.5  1.5μs△T=±10℃, 24 hours holdover after turning on 7 days and GPS lock 3 days

 

 
 
Supply Voltage
ParametersMin.Typ.Max.Unit.Test Condition
Supply Voltage4.755.05.25V  
Current consumption    1400mADuring warm-up
   600mADuring steady state operation @25℃
AC ripple    50mA10Hz ~ 1MHz
ConnectorPin 3  

 

 
1PPS
Output Waveform Features		ParametersMin.Typ.Max.Unit.Test Condition
WaveformHCMOS    
High-level Output Voltage2.7    V  
50Ω
Low-level Output Voltage    0.4V
Pulse Width  10  μs
ConnectorPin 12  

 

 
State intput
ParametersMin.Typ.Max.Typ.Test Condition
Lock2.7    V<5mA Load
Holdover    0.4V<5mA Load
ConnectorPin 5  
 

 

 
 
Serial Interfaces		ParametersMin.Typ.Max.Typ.Test Condition
Rx high-level input voltage2.7    V  
Rx low-level input voltage    0.4V  
Tx high-level output voltage2.7    V  
Tx low-level output voltage    0.4μs  
Serial protocol9600-N-8-1  
ConnectorPin 6 and Pin 7  

 

 
Environment
Compliance
ParameterConditions
Operating temperature-20℃~ 75℃
Storage temperature-55℃~ 105℃
Storage humidity30% ~ 80%
ESD levelHuman Body Model, class 2: 2000V to 4000V; ANSI/ESDA/JEDEC JS-001-2-2010.
Human Body Model, class B: 200V to 400V; ANSI/ESDA/JEDEC JS-001-2010.
Moisture Sensitivity LevelNot humidity sensitive

 
Vibration
Test Condition:
Amplitude: 0.75mm；acceleration: 10g；10Hz~500Hz; a cycle per 30min, test for 2 hours in 3 directions
（3 directions: X, Y and Z）, IEC 68-2-06 Test Fc.
Shock
50g；11ms；half sine wave （3 directions: X, Y and Z）, IEC 68-2-27 TestEa/Severity 50A.
Mechanical Structure (mm)

Note 1: Tolerance ±0.2mm without marking
Note 2: Referential weight 51.4g

PIN DEFINITION
PINNAMEPower supply input, 4.75V ~5.25V.
3VCCDESCRIBTION
5State OutputState output. Output high level when the CM is locked and stable, others low level.
6RX INPUTAsynchronous serial data input. 9600-N-8-1
7TX OUTPUTAsynchronous serial data output. 9600-N-8-1
8State
INPUT		H: LockThe work state is set to normal operation when the state input is high
L: HoldoverThe work state is set to hold over when the state input is low.
101PPS INPUT1PPS reference input
121PPS OUTPUTClock module 1PPS output
1410MHz OUTPUT10MHz OCXO frequency output
1、2、9NChang in the air
4、11、13GNDGND
Package （mm）