EH2545ETTTS-26.557M
REGULATORY COMPLIANCE
2011/65 +
2015/863
(Data Sheet downloaded on Aug 30, 2020)
191 SVHC
ITEM DESCRIPTION
Quartz Crystal Clock Oscillators XO (SPXO) HCMOS/TTL (CMOS) 5.0Vdc 4 Pad 5.0mm x 7.0mm Ceramic Surface Mount (SMD)
26.557MHz ±50ppm -40°C to +85°C
ELECTRICAL SPECIFICATIONS
Nominal Frequency
Frequency Tolerance/Stability
Aging at 25°C
Operating Temperature Range
Supply Voltage
Input Current
Output Voltage Logic High (Voh)
Output Voltage Logic Low (Vol)
Rise/Fall Time
Duty Cycle
Load Drive Capability
Output Logic Type
Pin 1 Connection
Tri-State Input Voltage (Vih and Vil)
Absolute Clock Jitter
One Sigma Clock Period Jitter
Start Up Time
Storage Temperature Range
26.557MHz
±50ppm Maximum (Inclusive of all conditions: Calibration Tolerance at 25°C, Frequency Stability over the Operating
Temperature Range, Supply Voltage Change, Output Load Change, First Year Aging at 25°C, Shock, and Vibration)
±5ppm/year Maximum
-40°C to +85°C
5.0Vdc ±10%
50mA Maximum (No Load)
2.4Vdc Minimum with TTL Load, Vdd-0.4Vdc Minimum with HCMOS Load (IOH= -16mA)
0.4Vdc Maximum with TTL Load, 0.5Vdc Maximum with HCMOS Load (IOL= +16mA)
6nSec Maximum (Measured at 0.8Vdc to 2.0Vdc with TTL Load; Measured at 20% to 80% of waveform with HCMOS
Load)
50 ±5(%) (Measured at 50% of waveform with TTL Load or with HCMOS Load)
10TTL Load or 50pF HCMOS Load Maximum
CMOS
Tri-State (High Impedance)
+2.2Vdc Minimum to enable output, +0.8Vdc Maximum to disable output (High Impedance), No Connect to enable
output.
±250pSec Maximum, ±100pSec Typical
±50pSec Maximum, ±30pSec Typical
10mSec Maximum
-55°C to +125°C
ENVIRONMENTAL & MECHANICAL SPECIFICATIONS
ESD Susceptibility
Fine Leak Test
Flammability
Gross Leak Test
Mechanical Shock
Moisture Resistance
Moisture Sensitivity
Resistance to Soldering Heat
Resistance to Solvents
Solderability
Temperature Cycling
Vibration
MIL-STD-883, Method 3015, Class 1, HBM: 1500V
MIL-STD-883, Method 1014, Condition A
UL94-V0
MIL-STD-883, Method 1014, Condition C
MIL-STD-883, Method 2002, Condition B
MIL-STD-883, Method 1004
J-STD-020, MSL 1
MIL-STD-202, Method 210, Condition K
MIL-STD-202, Method 215
MIL-STD-883, Method 2003
MIL-STD-883, Method 1010, Condition B
MIL-STD-883, Method 2007, Condition A
www.ecliptek.com | Specification Subject to Change Without Notice | Revision G 06/08/2012 | Page 1 of 7
Ecliptek, LLC
5458 Louie Lane, Reno, NV 89511
1-800-ECLIPTEK or 714.433.1200
EH2545ETTTS-26.557M
Test Circuit for TTL Output
Output Load
Drive Capability
10TTL
5TTL
2TTL
10LSTTL
1TTL
R
L
Value
(Ohms)
390
780
1100
2000
2200
C
L
Value
(pF)
15
15
6
15
3
Oscilloscope
Frequency
Counter
Table 1: R
L
Resistance Value and C
L
Capacitance
Value Vs. Output Load Drive Capability
Supply
Voltage
(V
DD
)
Probe
(Note 2)
Output
R
L
(Note 4)
+
+
Power
Supply
_
+
Voltage
Meter
_
Current
Meter
_
+
0.01µF
(Note 1)
0.1µF
(Note 1)
C
L
(Note 3)
Power
Supply
_
Ground
No Connect
or Tri-State
Note 1: An external 0.1µF low frequency tantalum bypass capacitor in parallel with a 0.01µF high frequency
ceramic bypass capacitor close to the package ground and V
DD
pin is required.
Note 2: A low capacitance (<12pF), 10X attenuation factor, high impedance (>10Mohms), and high bandwidth
(>300MHz) passive probe is recommended.
Note 3: Capacitance value C
L
includes sum of all probe and fixture capacitance.
Note 4: Resistance value R
L
is shown in Table 1. See applicable specification sheet for 'Load Drive Capability'.
Note 5: All diodes are MMBD7000, MMBD914, or equivalent.
www.ecliptek.com | Specification Subject to Change Without Notice | Revision G 06/08/2012 | Page 4 of 7
Ecliptek, LLC
5458 Louie Lane, Reno, NV 89511
1-800-ECLIPTEK or 714.433.1200
EH2545ETTTS-26.557M
Test Circuit for CMOS Output
Oscilloscope
Frequency
Counter
+
+
Power
Supply
_
+
Voltage
Meter
_
Current
Meter
_
Supply
Voltage
(V
DD
)
Probe
(Note 2)
Output
0.01µF
(Note 1)
0.1µF
(Note 1)
Ground
C
L
(Note 3)
No Connect
or Tri-State
Note 1: An external 0.1µF low frequency tantalum bypass capacitor in parallel with a 0.01µF high frequency
ceramic bypass capacitor close to the package ground and V
DD
pin is required.
Note 2: A low capacitance (<12pF), 10X attenuation factor, high impedance (>10Mohms), and high bandwidth
(>300MHz) passive probe is recommended.
Note 3: Capacitance value C
L
includes sum of all probe and fixture capacitance.
www.ecliptek.com | Specification Subject to Change Without Notice | Revision G 06/08/2012 | Page 5 of 7
Ecliptek, LLC
5458 Louie Lane, Reno, NV 89511
1-800-ECLIPTEK or 714.433.1200
Embedded System
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