1
Q-TECH Corporation - 10150 W. Jefferson Boulevard, Culver City 90232 - Tel: 310-836-7900 - Fax: 310-836-2157 - www.q-tech.com
QT481 AND QT488 SERIES
ULTRA-LOW CURRENT REAL TIME CLOCK OSCILLATORS
2.5Vdc and 3.3Vdc - 32.768kHz
QT481 and QT488 Series (Revision -, October 2010)
Q-TECH
CORPORATION
Description
Q-Tech’s leaded or surface-mount miniature
QT481 and QT488 oscillators consist of an IC
3.3Vdc and 2.5Vdc, clock square wave
generator and a miniature round or strip AT
quartz crystal built in a low profile ceramic
package with gold plated contact terminals.
Features
• Made in the USA
• ECCN: EAR99
• +3.3Vdc or +2.5Vdc operation
• 32.768kHz square wave CMOS output
• Wide operating temperature (*)
• Stand-by function:
High Impedance in stand-by mode oscillator stops
• Excellent AT cut crystal temperature
characteristics
• Tristate output option (D)
• Fundamental design
• Able to meet 36,000g shock half-sine
• Fast Start-up time
• RoHS compliant
(*) Available in high temperature for down-hole
application. Call Q-Tech for details
Applications
• Real-time clock driver
• 32.768kHz output crystal modules
Package Information
• Package material: 90% AL2O3
• Lead material: Kovar
• Lead finish:
Gold Plated: 50μ ~ 80μ inches
Nickel Underplate: 100μ ~ 250μ inches
• Weight: 0.6g typ., 3.0g max.
2
Q-TECH Corporation - 10150 W. Jefferson Boulevard, Culver City 90232 - Tel: 310-836-7900 - Fax: 310-836-2157 - www.q-tech.com
QT481 AND QT488 SERIES
ULTRA-LOW CURRENT REAL TIME CLOCK OSCILLATORS
2.5Vdc and 3.3Vdc - 32.768kHz
QT481 and QT488 Series (Revision -, October 2010)
Electrical Characteristics
Parameters +3.3Vdc +2.5Vdc
Output frequency range (Fo) 32.768kHz
Supply voltage (Vdd) +3.3Vdc ± 10% +2.5Vdc ± 10%
Maximum Applied Voltage
(Vdd max.) +5Vdc
Frequency stability (∆F/∆T) See Ordering Information
Operating temperature (Topr) See Ordering Information
Storage temperature (Tsto) -55ºC to + 125ºC
Operating supply current
(Idd) (No Load) 0.42 mA typ., 0.7mA max. 0.24 mA typ., 0.5mA max.
Symmetry
(50% of ouput waveform) 50/50% typ., 45/55% max.
Rise and Fall times
(Tr, Tf betweeen 10% and 90% of output waveform) 0.2µs typ., 1µs max.
Output Load 15pF
Start-up time (Tstup) 10ms max.
Output voltage (Voh/Vol) 0.9 x Vdd min.; 0.1 x Vdd max.
Output Current (Ioh/Iol) ± 2mA min.
Enable/Disable function Pin 1
VIH ≥ 0.7Vdd: Active
VIL ≤ 0.3Vdd: High Impedance
Stand-by current: 10µA max.
Aging ± 5ppm max. first year / ± 2ppm max. per year thereafter
Q-TECH
CORPORATION
3
Q-TECH Corporation - 10150 W. Jefferson Boulevard, Culver City 90232 - Tel: 310-836-7900 - Fax: 310-836-2157 - www.q-tech.com
QT481 AND QT488 SERIES
ULTRA-LOW CURRENT REAL TIME CLOCK OSCILLATORS
2.5Vdc and 3.3Vdc - 32.768kHz
QT481 and QT488 Series (Revision -, October 2010)
Q-TECH
CORPORATION
Package Outline and Pin Connections
(5.080 ± 0.13)
0.200 ± .005
0.040
(1.02)
0.197 ± .006
(5.00 ± 0.15)
0.276 ± .006
(7.0 ± 0.2)
(2.54)
0.100
12
43
0.018±.003
(.46±0.08)
(.20 ± 0.03)
0.008 ± .001
(5.08 ± 0.2)
0.200 ± .008
max.
0.205 ± .010
(5.20 ± 0.25)
R 0.20
(R .008)
(4X)
(0.20)
0.008 0.200±.005
(5.80±0.13)
0.028
(0.72)
P/N
FREQ.
D/C S/N
QT481
0.197 ± .006
(5.00 ± 0.15)
0.276 ± .006
(7.0 ± 0.2)
12
43
(5.08 ± 0.2)
0.200 ± .008
R 0.20
(R .008)
(4X)
0.060
(1.52)
(.203)
0.008
(1.27)
0.050
0.216
(5.49)
(2.54)
0.100 max.
0.018±.003
(.46±0.08)
(0.20)
0.008
0.028
(0.72)
P/N
FREQ.
D/C S/N
QT482
(1.27)
0.050
0.216
(5.49)
(.203)
0.008
0.197 ± .006
(5.00 ± 0.15)
0.276 ± .006
(7.0 ± 0.2)
(5.08 ± 0.2)
0.200 ± .008
R 0.200
(R .008)
(4X)
0.060
(1.52)
(2.54)
0.100 max.
0.018±.003
(.46±0.08)
(0.20)
0.008
0.028
(0.72)
2
43
1
P/N
FREQ.
D/C S/N
QT483
.102
(2.6)
0.055
(1.4)
0.040
(1.0)
(2.0)
0.079
12
34
max.
0.197±.006
(5.00±0.15)
0.276±.006
(7.0±0.2)
12
43
(5.08±0.2)
0.2±.008
R 0.200
(R .008)
(4X)
P/N
FREQ.
D/C S/N
QT484
0.290±0.005
(7.37±0.13)
0.350±0.005
(8.89±0.13)
0.100±0.005
(2.54±0.13)
0.200±0.005
(5.08±0.13)
0.170 Max.
(4.32)
0.018±0.003
(0.457±0.076)
0.315 max.
(8.00 max.)
0.240±0.005
(6.10±0.13)
0.040 Max.
(1.02)
P/N
FREQ.
Q-TECH
D/C S/N
12
43
QT488
Dimensions are in inches (mm)
QT489 QT490 QT492
12
43
0.350±0.005
0.290±0.005
0.130
0.018±.003
(8.00 max.)
(5 080±0 13)
0.100±.005
0.200±.005
(.457±0.076)
(8.89±0.13)
(7.37±0.13)
(2.54±0.13)
(5.080±0.13)
(3.30)
0.050
(1.27)
P/N
FREQ.
Q-TECH
D/C S/N
0.315 max.
0.200±.005
0 008
MAX.
6 X
0.290±0.005
0.190 MAX.
(1.396±0.13)
0.200±.005
0.048±.002
(1.22±0.051)
(7.37±0.13)
(5.08±0.13)
0.100±.005
(2.54±0.13)
(4.826 MAX.)
(.203) (2.794±0.13)
(8.00 max.)
0.315 max.
0.055±.005
0.008 0.110±.005
1 2
43
0.350±.0.005
(8.89±0.13)
P/N
FREQ.
Q-TECH
D/C S/N
Pin No.
Function
1
TRISTATE or NC
2
GND/CASE
3
OUTPUT
4
VDD
4
Q-TECH Corporation - 10150 W. Jefferson Boulevard, Culver City 90232 - Tel: 310-836-7900 - Fax: 310-836-2157 - www.q-tech.com
QT481 AND QT488 SERIES
ULTRA-LOW CURRENT REAL TIME CLOCK OSCILLATORS
2.5Vdc and 3.3Vdc - 32.768kHz
QT481 and QT488 Series (Revision -, October 2010)
Q-TECH
CORPORATION
Ordering Information
Packaging Options
Other Options Available For An Additional Charge
Frequency stability vs. temperature codes may not be available in all frequencies.
For Non-Standard requirements, contact Q-Tech Corporation at Sales@Q-Tech.com
Specifications subject to change without prior notice.
• Standard packaging in anti-static plastic tube (60pcs/tube)
• Tape and Reel (800pcs/reel) is available for an additional
charge.
•(*) Hot Solder Dip Sn60 per MIL-PRF 55310
• P. I. N. D. test (MIL-STD 883, Method 2020)
Output frequency
Frequency vs. Temperature Code:
1 = ± 100ppm at 0ºC to +70ºC
4 = ± 50ppm at 0ºC to +70ºC
5 = ± 25ppm at -20ºC to +70ºC
6 = ± 50ppm at -55ºC to +105ºC
9 = ± 50ppm at -55ºC to +125ºC
10 = ± 100ppm at -55ºC to +125ºC
11 = ± 50ppm at -40ºC to +85ºC
12 = ± 100ppm at -40ºC to +85ºC
QT488LD10M-32.768kHz
QT 4 88 LD10 M- 32.768kHz
Sample part number
T = Standard
S = Solder Dip (*)
Screening Options:
Blank =No Screening
M=Per MIL-PRF-55310, Level B
Tristate Option
Blank = No Tristate
D = Tristate
Logic:
L = +3.3Vdc
N = +2.5Vdc
Model #:
(See page 3)
5
Q-TECH Corporation - 10150 W. Jefferson Boulevard, Culver City 90232 - Tel: 310-836-7900 - Fax: 310-836-2157 - www.q-tech.com
QT481 AND QT488 SERIES
ULTRA-LOW CURRENT REAL TIME CLOCK OSCILLATORS
2.5Vdc and 3.3Vdc - 32.768kHz
QT481 and QT488 Series (Revision -, October 2010)
Q-TECH
CORPORATION
Embossed Tape and Reel Information For QT488
Environmental Specifications
The five transition periods for the typical reflow process are:
• Preheat
• Flux activation
• Thermal equalization
• Reflow
• Cool down
Dimensions are in mm. Tape is compliant to EIA-481-A.
Reel size vs. quantity:
Ø178±1
26
FEEDING (PULL) DIRECTION
Ø13.0±0.5
120°
2.5
4.699±0.1 Ø1.5
16±0.1
2.0
1.75±0.1
0.3±.005
2.0±0.1
7.747±0.1
4.0±0.1
or
Ø330±1
Ø1.5
9.271
5°Max
24.0±0.3
11.5
Reel size (Diameter in mm)
Qty per reel (pcs)
178
150
330
800
Q-Tech Standard Screening/QCI (MIL-PRF55310) is available for all of our QT481 and QT488 series. Q-Tech can also customize
screening and test procedures to meet your specific requirements. The QT481 and QT488 series are designed and processed to exceed
the following test conditions:
Environmental Test Test Conditions
Temperature cycling MIL-STD-883, Method 1010, Cond. B
Constant acceleration MIL-STD-883, Method 2001, Cond. A, Y1
Seal: Fine and Gross Leak MIL-STD-883, Method 1014, Cond. A and C
Burn-in 160 hours, 125°C with load
Aging 30 days, 70°C, ±1.5ppm max
Vibration sinusoidal MIL-STD-202, Method 204, Cond. D
Shock, non operating MIL-STD-202, Method 213, Cond. I (See Note 1)
Thermal shock, non operating MIL-STD-202, Method 107, Cond. B
Ambient pressure, non operating MIL-STD-202, 105, Cond. C, 5 minutes dwell time minimum
Resistance to solder heat MIL-STD-202, Method 210, Cond. B
Moisture resistance MIL-STD-202, Method 106
Terminal strength MIL-STD-202, Method 211, Cond. C
Resistance to solvents MIL-STD-202, Method 215
Solderability MIL-STD-202, Method 208
ESD Classification MIL-STD-883, Method 3015, Class 1 HBM 0 to 1,999V
Moisture Sensitivity Level J-STD-020, MSL=1
Note 1: Additional shock results successfully passed on 16MHz, 20MHz, 24MHz, 40MHz, and 80MHz
• Shock 850g peak, half-sine, 1 ms duration (MIL-STD-202, Method 213, Cond. D modified)
• Shock 1,500g peak, half-sine, 0.5ms duration (MIL-STD-883, Method 2002, Cond. B)
• Shock 36,000g peak, half-sine, 0.12 ms duration
Please contact Q-Tech for higher shock requirements
0 20 40 60 80 100 120 140 160 180 200 220 240 260 280 300 320 340 360 380 400 420 Time (s)
25
50
75
100
125
150
175
200
225
250
TEMP(*C)
0
60s min.
120s max.
60s min.
120s max.
225º min.
240º max.
60s min.
150s max.
240º
Ramp down (6ºC/s Max)
Ramp up (3ºC/s Max)
TYPICAL REFLOW PROFILE FOR Sn-Pb ASSEMBLY
Reflow Profile
6
Q-TECH Corporation - 10150 W. Jefferson Boulevard, Culver City 90232 - Tel: 310-836-7900 - Fax: 310-836-2157 - www.q-tech.com
QT481 AND QT488 SERIES
ULTRA-LOW CURRENT REAL TIME CLOCK OSCILLATORS
2.5Vdc and 3.3Vdc - 32.768kHz
QT481 and QT488 Series (Revision -, October 2010)
Q-TECH
CORPORATION
Output Waveform (Typical)
Frequency vs. Temperature Curve
Test Circuit
-
-
Output
Ground
43
2
0.1µF
15pF
1
Tristate Function
Power
supply 10k
mA
Vdc
+
+
+
(*)
or
0.01µF
QT88
(*) CL includes probe and jig capacitance
Typical test circuit for CMOS logic
Thermal Characteristics
The Tristate function on pin 1 has a built-in pull-up resistor typical 50kΩ, so it can
be left floating or tied to Vdd without deteriorating the electrical performance.
The heat transfer model in a hybrid package is described in
figure 1.
Heat spreading occurs when heat flows into a material layer of
increased cross-sectional area. It is adequate to assume that
spreading occurs at a 45° angle.
The total thermal resistance is calculated by summing the
thermal resistances of each material in the thermal path
between the device and hybrid case.
RT = R1 + R2 + R3 + R4 + R5
The total thermal resistance RT (see figure 2) between the heat
source (die) to the hybrid case is the Theta Junction to Case
(Theta JC) in°C/W.
• Theta junction to case (Theta JC) for this product is 30°C/W.
• Theta case to ambient (Theta CA) for this part is 100°C/W.
• Theta Junction to ambient (Theta JA) is 130°C/W.
Maximum power dissipation PD for this package at 25°C is:
• PD(max) = (TJ (max) – TA)/Theta JA
• With TJ = 175°C (Maximum junction temperature of die)
• PD(max) = (175 – 25)/130 = 1.15W
-250
-200
-150
-100
-50
0
50
100
150
200
250
0 10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 160 170 180 190 200
Frequency Stability (PPM)
Temperature (°C)
Type: QT88LD8M Vcc Input:3.3 Out Freq:32.768Khz +/-250ppm@ 0 to 200 deg.C
Start up Time
45º 45º
Hybrid Case
Substrate
Die
D/A epoxy
D/A epoxy
Heat
Die
R1
D/A epoxy Substrate D/A epoxy Hybrid Case
R2 R3 R4 R5
JA JC CA
Die
T
T
TC
A
J
CA
JC
(Figure 1)
(Figure 2)