EURO
QUARTZ
Low Power (nA Current Consumption)
FEATURES
EME83 SERIES TCXO
32.768kHz
EME83x is a 32.768kHz CMOS output TCXO with a maximum frequency stability of ±5ppm (±2.62
minutes / year) over the operating temperature range -40° to +85°C. This time-keeping accuracy is
outstanding in the industry.
A proprietary temperature compensation technique is applied to the built-in X-Cut 32.768kHz
tuning fork crystal and temperature sensor.
A 400nA current compensation (average f
OUT
≤128Hz, 4 min TMP.) makes it ideal for battery
operated devices.
The TCXO is packaged in a 7 x 5 x 1.8mm package, ideal for miniaturized applications.
Designed for long-term frequency reference applications.
APPLICATIONS
·
·
·
·
·
·
Frequency Reference for real time clocks (RTC).
Portable instrumentation.
Timing synchronization for networks, servers, hubs, routers and switches.
Timing Reference input for various energy metering ICs.
Smart metering, data loggers.
GPS receivers, telematics.
RELATED EUROQUARTZ PRODUCTS
·
·
If temperature compensation is not required please consider using Euroquartz HA series 32.768kHz (AT-CUT crystal, µA current
consumption, ±25/±50/±200ppm over commercial or industrial temperature ranges).
If tighter than ±5ppm frequency stability is required, i.e. ±1~±2.5ppm over -40° to +85°C, please consider use of EM572T
32.768kHz TCXO or VEM572T 32.768kHz VCTCO series. (All use AT-Cut crystals, mA current consumption.)
FREQUENCY-TEMPERATURE CHARACTERISTICS
EME83x, Temperature
Compensated.
∆f/f = ±5ppm max.
Not Temperature
Compensated.
∆f/f = -0.035(T
o
-25)
2
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EUROQUARTZ LIMITED Blacknell Lane CREWKERNE Somerset UK TA18 7HE
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EURO
QUARTZ
Low Power (nA Current Consumption)
GENERAL SPECIFICATIONS
Product Series
EME831
Temperature Measurement
Period (TMP), Also known as
Compensation Interval.
Every 1 minute
(at 25°C and specified input voltage)
EME83 SERIES TCXO
32.768kHz
EME831, EME832, EME833 and EME834
EME832
Every 2 minutes
EME833
Every 30 seconds
EME834
Every 4 minutes
(standard series)
Overall power consumption increases for more frequent measurement periods. For lowest power
consumption the 4 minute measurement period (model EME834) is recommended. For peak current
during temperature measurement see I
DD
data below
Standard frequency: 32.768kHz
Frequency
Also available in 4.096kHz, 1.024kHz, 128Hz, 32Hz, 1Hz, 1/10Hz, 1/60Hz.
Supply Voltage (V
DD
) Range
Supply
Voltages
(V
DD
)
(V
DD
)
Tolerance
Voltage Code
1.7V minimum, 5.5V maximum
1.8V ±5%
1.71V ~ 1.89V
18
0.79µA
2.5V ±5%
2.37V ~ 2.62V
25
1.05µA
3.0V ±5%
2.85V ~ 3.15V
3
1.25µA
3.3V ±5%
2.97V ~ 3.63V
33
1.37µA
5.0V ±5%
4.75V ~ 5.25V
5
2.05µA
Supply Current (I
DD1
) Typical
Conditions: No load, 25°C,
f
OUT
= 32.768kHz
Peak Current during
Temperature Measurement (I
DD2
)
Typical.
Conditions: No load, 25°C,
f
OUT
= 32.768kHz
Supply Current (I
DD3
) when Pad 1
is disabled. Typical
Conditions: No load, 25°C,
f
OUT
= 32.768kHz
Supply Current (I
DD4
) Typical
Conditions: No load, 25°C,
f
OUT
= 32Hz
Initial Calibration Tolerance
1.95µA
2.0µA
2.03µA
2.05µA
2.14µA
0.39µA
0.47µA
0.53µA
0.56µA
0.80µA
327nA
408nA
460nA
470nA
700nA
±1.5ppm maximum over -40° to +85°C w.r.t. f
O
at +25°C
±5ppm maximum over -40° to +85°C w.r.t. f
O
at +25°C
Frequency Stability (ppm)
over temperature
Per day
Timing Error
over Time
Per month
Per year
±0.432 s/day max.
±12.960 s/month max.
±2.628 minutes/year max.
Frequency Stability
vs. Ageing
vs. Load Change
vs. Reflow
vs. All range of VDD (∆f/V)
Supply Voltage Variation
(∆V
DD
)
Output Wave Form
Output Load
±3ppm/year maximum first year at 25°C
±0.2ppm max. for a 10% load condition change
±1ppm max. 1 reflow and measured 24 hours afterwards
±1ppm/Volt max. V
DD
= 1.7V to 5.5V.
0.25 V max. Supply voltage stability at specified V
DD
. Condition
∆V / ∆t = 1 V/µs
CMOS Square Wave
15pF
Page 2 of 5
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
EURO
QUARTZ
Low Power (nA Current Consumption)
Output Voltage Levels
Rise Time (t
R
) and
Fall Time (t
F
)
Start-up Time (T
S
)
Duty Cycle (Symmetry)
V
OH
V
OL
EME83 SERIES TCXO
32.768kHz
V
DD
- 0.4V min. I
OH
= -0.1mA, all V
DD
range
0.4V max., I
OL
= 0.1mA, all V
DD
range
100 ns max., at 20% to 80% of waveform. 15pF load.
1ms max., at +25°C; 3ms max. over -40° to +85°C
32768Hz, 4096Hz & 1024Hz: 50%±10% max.
128Hz, 32Hz, 1Hz, 1/10Hz, 1/60Hz: 50% ±5% max.
Vih = 0.8 *V
DD
Vil = 0.2*V
DD
Measured at 50% of VDD
over -40° to +85°C
Pin 1 OE Thresholds
ENVIRONMENTAL PERFORMANCE and SPECIFICATIONS
Green Compliance
Moisture Sensitivity Level
Humidity
Hermeticity
Solderability
Vibration
Shock
Electrostatic Sensitivity
Contact Pad Surface Finish
Solder Reflow
Weight of the device
RoHS Compliant, Pb (lead) free in accordance with EU Directive 2002/95/EC
MSL = 1. According to IPC/JEDEC J-STD-020D.1
85% RH, 85°C for 48 hours
Leak rate 2 x 10
-8
ATM-cm3/s maximum.
MIL-STD-202F method 208E
MIL-STD-202F method 204, 35G, 50 to 2000Hz
MIL-STD-202F method 213B, test condition E, 1000g ½ sinewave
2kV minimum, Human Body Model (HBM) according to IEC 610000-4-2
0.3 ~ 1.2µm gold over 1.27 ~ 8.89µm nickel
20s masx at peak temperature of 260°C. Two reflows maximum
0.196 grams typical
ABSOLUTE MAXIMUM RATINGS
Supply Voltage (VDD)
Ambient Temperature Range
Storage Temperature Range
-0.5V minimum, 6.5V maximum VSS = 0V
-40° to +85°C
-40° to +85°C for temperature compensated units
TYPICAL FREQUENCY STABILITY OVER TEMPERATURE
Page 3 of 5
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Tel: +44 (0)1460 230000 Fax: +44 (0)1460 230001 info@euroquartz.co.uk www.euroquartz.co.uk
EURO
QUARTZ
Low Power (nA Current Consumption)
PEAK CURRENT DURING MEASUREMENT PERIOD
EME83 SERIES TCXO
32.768kHz
Example shown: 18EME833 Series (VDD = 1.8V, temperature measurement period = 30 seconds.)
BLOCK DIAGRAM
PACKAGE DIMENSIONS and SUGGEST SOLDER LAYOUT
Page 4 of 5
EUROQUARTZ LIMITED Blacknell Lane CREWKERNE Somerset UK TA18 7HE
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EURO
QUARTZ
Low Power (nA Current Consumption)
PART NUMBER SCHEDULE
Example: 18EM834-32768
EME83 SERIES TCXO
32.768kHz
18 EM83 4 - 32768
Supply Voltage
18 = 1.8 VDC
25 = 2.5 VDC
3 = 3.0 VDC
33 = 3.3 VDC
5 = 5.0 VDC
Product Series EME83
Measurement Period
1 = Every minute
2 = Every 2 minutes
3 = Every 30 seconds
4 = Every 4 minutes
(standard)
Frequency in Hz
Orderable Part Output
Numbers
Frequency
xxME83y-1/60
xxME83y-1/10
xxME83y-1
xxME83y-32
xxME83y-128
xxME83y-1024
xxME83y-4096
xxME83y-32768
1/60Hz
1/10Hz
1Hz
32Hz
128Hz
1024Hz
4096Hz
32768Hz
RECOMMENDED SOLDER REFLOW PROFILE
(per IPC/JEDEC J-STD-020D.1)
Profile Feature
Preheat/Soak
Temperature min. (Ts min.)
Temperature max. (Ts max.)
Time (ts) (ts min. to ts max.)
Ramp-up Rate (T
L
to T
P
)
Liquidous Temperature
Time (t
L
) maintained above T
L
Peak package body temperature (Tp)
Time (Tp) within 5°C of the classification temperature Tc
Ramp-down rate (Tp to T
L
)
Time 25°C to peak temperature
Sn-Pb Eutectic Assembly
Pb-free Assembly
100°C
150°C
60 to 120 seconds
3°C/second maximum
183°C
60 to 150 seconds
235°C
10 to 30 seconds
6°C/second maximum
6 minutes maximum
150°C
200°C
60 to 180 seconds
3°C/second maximum
217°C
60 to 150 seconds
260°C
20 to 40 seconds
6°C/second maximum
8 minutes maximum
All temperature refer to topside of the package, measured on the package body surface.
Page 5 of 5
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
