Data Sheet

EURO QUARTZ
LFXO TF OSCILLATORS
Low Power Coinsumption SMD Crystal Oscillator
32.768kHz
FEATURES
Very low power consumption
Tight frequency tolerance
CMOS Output
Optional output Eanable/Disable with Tri-state
Low EMI emission
Full military testing available
OUTLINE & DIMENSIONS
DESCRIPTION
The 32.7368kHz LFXO oscillator has been designed especially for
applications requiring low power consumption, as low as 500nA. The
oscillator consists of a miniature tuning fork quartz crystal and a
CMOS/TTL compatible hybrid circuit. Each crystal is pre-qualified
before assembly by electrical tests and temperature characterization.
SPECIFICATION
Specifications are typical at 25°C unless otherwise indicated.
Specifications are liable to change without notice.
Frequency:
32.768kHz
Supply Voltage:
1.8V to +5.0 Volts ±10%
Calibration Tolerance:
±10, ±50 or ±100ppm
Frequency Stability
over Operating Temperature Range
0° ~ +50°C:
±25ppm
-40° ~ +85°C:
±100ppm
-55° ~ +125°C:
±100ppm
Ageing:
±1ppm year typical
±3ppm per year maximum.
Shock, Survival:
5000g, 0.3ms, ½ sine
Vibration Survival:
20g, 10~2000Hz swept sine
Frequency Change vs.
10% Output Load Change:
±1ppm maximum.
Operating Temperature Range
Commercial:
-10° to +70°C
Industrial:
-40° to +85°C
Military:
-55° to +125°C
Typical Current Consumption
Vdd = 1.8V:
0.5µA
Vdd = 2.5V:
0.6µA
Vdd = 3.3V:
0.7µA
Vdd = 5.0V:
1.3µA
Output:
CMOS
Rise/Fall Times:
12ns typical, 25ns maximum
Duty Cycle:
45/55%
Process Temperature:
260°C, 20 seconds
Storage Temperature:
-55° to +125°C
ENABLE/DISABLE OPTIONS
There are two Enable/Disable options available, 'E' and 'N'. The 'E'
option stops oscillating when the output is put into the High Z state.
the 'N' version does not have Pad 1 connected internally. The table
below describes the 'E' Enable/Disable option.
Enable (Pad 1 High) Disable (Pad 1 Low)
Output
Oscillator
Current
Frequency Output
Oscillates
Normal
High Z state
Stops
Very Low
When Pad 1 is allowed to float it is held high
(output enabled) by an internal pull-up resistor.
HOW TO ORDER LFXO SMD CRYSTAL OSCILLATORS
LFXO
TF
TF = Low Power
4
Supply Voltage
1 = 1.8V
2 = 2.5V
3 = 3.0V
4 = 3.3V
5 = 5.0V
S
T
Enable/Disable
option, T or N
Blank = standard
S = special or
custom
-
SM3
-
Terminations
Blank = SM1 =Gold plated
SM3 = Solder dipped
SM5 = Solder dipped
(SM1 and SM5 are pB free)
32.768k
Frequency
k = kHz
30
Calibration
Tolerance
at 25°C
(in ±ppm)
/
30
/ – /
I
Temp. Range
C = -10° ~ +70°C
I = -40° ~ +85°C
M = -55° ~ +125°C
S = Customer specified
Frequency
Stability over
Temp. Range
(in ppm)
OR
— / — / 50
Total
Frequency
Tolerance
(in ppm)
/
I
Temp. Range
C = -10° ~ +70°C
I = -40° ~ +85°C
M = -55° ~ +125°C
S = Customer specified
EUROQUARTZ LIMITED Blacknell Lane CREWKERNE Somerset UK TA18 7HE
Tel: +44 (0)1460 230000 Fax: +44 (0)1460 230001 [email protected] www.euroquartz.co.uk
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