EURO
QUARTZ
Low Power AT-Cut Clock Oscillator
FEATURES
AT-Cut crystal for excellent temperature stability
Low power consumption: 50µA typical at 15pF load
Wide supply voltage: +1.8 V to 5.0 Volts
Stability ±20ppm, 25ppm or ±30ppm
Fast start-up time
Micro-miniature 3.2mm x 2.5mm package
XO3225 OSCILLATOR
32.768kHz
OUTLINE & DIMENSIONS
DESCRIPTION
XO3225 oscillators utilise AT-Cut crystals providing much improved,
tight frequency stability as opposed to that stabiity provided by
32.768kHz oscillators using the more usual X-Cut (tuning fork)
crystals. The tight control of frequency provided by these oscillators
results in a typical variation of 52 seconds for one month of
continuous operation as against 260 seconds over the same period
for oscillators that use tuning fork crystals.Other benefits include low
supply current consumption coupled with quick start-up times.
SPECIFICATION
Frequency:
Frequency stability*
Operating Temperature Range:
Storage Temperature Range:
Input Voltage:
Input Current:
Output Symmetry:
Rise/Fall Times:
Logic Low '0' Level (Vol):
Logic High '1' Level (Voh):
Output Load:
Start-up Time:
Ageing:
Enable/Disable Delay Time*:
NOTE
32.7680kHz
±20ppm, ±25ppm, ±30ppm
(Overall conditions)
-40° to +85°C
-55° to +125°C
+1.8 Volts to 5.0 Volts ±5%
80µA maximum (50µA typical)
45% to 55% at ½ Vdd level
6ns maximum (10% to 90%Vdd)
10% Vdd maximum
90% Vdd minimum
CMOS 15pF maximum
1ms maximum
±3ppm max. at 25±3°C 1st year
100ns maximum
INPUT CURRENT vs. VDD
STABILITY OVER TEMPERATURE
(High stability over -40° to +85°C for XO3225 AT-Cut Type)
PART NUMBERS
XO3225 oscillators part numbers are ordered as follows:
32.7680kHz XO3225 - 25 - B
Frequency
32.768kHz
Model Number
XO3225
Stability in ppm
20, 25 or 30ppm
Supply Voltage
Blank = 5.0 Volts
A = 3.3 Volts
B = 2.5 Volts
C = 1.8 Volts
EUROQUARTZ LIMITED Blacknell Lane CREWKERNE Somerset UK TA18 7HE
Tel: +44 (0)1460 230000 Fax: +44 (0)1460 230001 info@euroquartz.co.uk www.euroquartz.co.uk
ADI Reference Circuit
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