QT481 AND QT488 SERIES
Q-TECH
CORPORATION
ULTRA-LOW CURRENT REAL TIME CLOCK OSCILLATORS
2.5Vdc and 3.3Vdc - 32.768kHz
Description
Q-Tech’s leaded or surface-mount miniature QT481 and
QT488 oscillators consist of an IC 2.5Vdc and 3.3Vdc,
clock square wave generator and a miniature round or
strip A quartz crystal built in a low profile ceramic
T
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 A cut crystal temperature characteristics
T
Tristate output option (D)
Fundamental design
Able to meet 36,000g shock half-sine
Fast Start-up time
(*) Available in high temperature for down-hole
application. Call Q-Tech for details
Applications
• Real-time clock driver
• 32.768kHz output crystal modules
• Package material: 91% AL2O3
• Lead material: Kovar
• Lead finish:
Gold Plated: 50μ ~ 80μ inches
Nickel Underplate: 100μ ~ 250μ inches
• Weight: 0.6g typ., 3.0g max.
Package Information
Q-TECH Corporation - 10150 W. Jefferson Boulevard, Culver City 90232 - Tel: 310-836-7900 - Fax: 310-836-2157 - www.q-te ch.com
QPDS-0008 (Revision A, June 2013) (ECO # 10907)
1 of 7
QT481 AND QT488 SERIES
Q-TECH
CORPORATION
ULTRA-LOW CURRENT REAL TIME CLOCK OSCILLATORS
2.5Vdc and 3.3Vdc - 32.768kHz
Electrical Characteristics
Output frequency range (Fo)
Supply voltage (Vdd)
Maximum Applied Voltage
(Vdd max.)
Parameters
+3.3Vdc
+3.3Vdc ± 10%
32.768kHz
+5Vdc
+2.5Vdc
+2.5Vdc ± 10%
Frequency stability (∆F/∆T)
Storage temperature (Tsto)
Operating temperature (Topr)
0.42 mA typ., 0.7mA max.
See Ordering Information
-55ºC to + 125ºC
See Ordering Information
0.24 mA typ., 0.5mA max.
Operating supply current
(Idd) (No Load)
Symmetry
(50% of ouput waveform)
Rise and Fall times
(Tr, Tf betweeen 10% and 90% of output waveform)
Output Load
Start-up time (Tstup)
50/50% typ., 45/55% max.
0.2µs typ., 1µs max.
10ms max.
15pF
Output voltage (V ol)
oh/V
Output Current (Ioh/Iol)
0.9 x Vdd min.; 0.1 x Vdd max.
VIH ≥ 0.7Vdd: Active
VIL ≤ 0.3Vdd: High Impedance
Stand-by current: 10µA max.
± 2mA min.
Enable/Disable function Pin 1
Aging
± 5ppm max. first year / ± 2ppm max. per year thereafter
Q-TECH Corporation
-
10150 W. Jefferson Boulevard, Culver City 90232
-
Tel: 310-836-7900 - Fax: 310-836-2157
-
www.q-te c h.co m
QPDS-0008 (Revision A, June 2013) (ECO # 10907)
2 of 7
QT481 AND QT488 SERIES
Q-TECH
CORPORATION
Package Outline and Pin Connections -
Dimensions are in inches (mm)
QT481
0.276 ± .006
(7.0 ± 0.2)
4
3
ULTRA-LOW CURRENT REAL TIME CLOCK OSCILLATORS
2.5Vdc and 3.3Vdc - 32.768kHz
QT483
0.276 ± .006
(7.0 ± 0.2)
4
3
(4X)
R 0.200
(R .008)
4
QT482
0.276 ± .006
(7.0 ± 0.2)
QT484
0.276±.006
(7.0±0.2)
3
(4X)
R 0.200
(R .008)
(4X)
R 0.20
(R .008)
(4X)
R 0.20
(R .008)
3
4
P/N
FREQ.
D/C S/N
1
0.200 ± .008
(5.08 ± 0.2)
2
0.197 ± .006
(5.00 ± 0.15)
P/N
FREQ.
D/C S/N
1
0.200 ± .008
(5.08 ± 0.2)
2
0.197 ± .006
(5.00 ± 0.15)
P/N
FREQ.
D/C S/N
1
0.200 ± .008
(5.08 ± 0.2)
2
0.197 ± .006
(5.00 ± 0.15)
P/N
FREQ.
D/C S/N
1
0.2±.008
(5.08±0.2)
2
0.197±.006
(5.00±0.15)
0.100
max.
(2.54)
0.028
(0.72)
0.040
(1.02)
0.008
(0.20)
0.100
max.
(2.54)
0.028
(0.72)
0.060 ± .003
(1.52 ± 0.08)
0.008
(0.20)
0.200±.005
(5.80±0.13)
0.008
(0.20)
0.100
max.
(2.54)
0.028
(0.72)
0.060 ± .003
(1.52 ± 0.08)
1
4
2
3
0.079
(2.0)
max.
0.018±.003
(.46±0.08)
0.018±.003
(.46±0.08)
0.018±.003
(.46±0.08)
0.216
(5.49)
A’
0.200 ± .005
0.008 ± .001
(.20 ± 0.03)
0.205 ± .010
(5.20 ± 0.25)
(5.080 ± 0.13)
0.216
(5.49)
.102
(2.6)
A’
0.008
(.203)
0.055 ± .003
(1.40 ± 0.08)
3º to 5º typ.
detail A’
0.055
0.040
(1.0)
0.008
(.203)
3º to 5º typ.
0.055± .003
(1.40 ± 0.08)
(1.4)
detail A’
QT488
0.350±0.005
(8.89±0.13)
4
3
QT489
0.350±0.005
(8.89±0.13)
4
3
QT490
.350 ± .005
(8.89 ± .13)
4
3
QT492
.350 ± .005
(8.89 ± .13)
4
3
Q-TECH
P/N
FREQUENCY
D/C S/N
0.290±0.005
(7.37±0.13)
Q-TECH
P/N
FREQ.
D/C S/N
0.290±0.005
(7.37±0.13)
Q-TECH
P/N
FREQ.
D/C S/N
.290 ± .005
(7.37 ± .13)
Q-TECH
P/N
FREQ.
D/C S/N
.290 ± .005
(7.37 ± .13)
1
2
0.100±0.005
(2.54±0.13)
1
2
0.100±.005
(2.54±0.13)
1
2
.100 ± .005
(2.54 ± .13)
1
2
.100 ± .005
(2.54 ± .13)
.200 ± .005
0.200±0.005
(5.08±0.13)
0.200±.005
(5.080±0.13)
.200 ± .005
(5.08 ± .13)
(5.08 ± .13)
0.170 Max.
(4.32)
0.018±0.003
(0.457±0.076)
0.130
(3.30)
MAX.
.190 MAX.
(4.826 MAX.)
.048 ± .002
4X
.190 MAX.
(4.826 MAX.)
0.050
(1.27)
0.018±.003
.048 ± .002
(1.22 ± .051)
4X
(1.22 ± .051)
.018 ± .003
4X
.018 ± .003
(.457 ± .076)
0.315 max.
(8.00 max.)
4X
(.457 ± .076)
.315 max.
(.457±0.076)
.315 max.
(8.00 max.)
0.040 Max.
(1.02)
(8.00 max.)
0.315 max.
(8.00 max.)
.055 ± .005
(1.396 ± .13)
.008
(.203)
.110 ± .005
(2.794 ± .13)
0.240±0.005
(6.10±0.13)
0.200±.005
0.008
(5.080±0.13)
.400 TYP.
(10.16 ± .13)
.008
(.203)
Pin No.
1
2
3
4
(.203)
TRISTA or NC
TE
GND/CASE
OUTPUT
VDD
Function
Q-TECH Corporation - 10150 W. Jefferson Boulevard, Culver City 90232 - Tel: 310-836-7900 - Fax: 310-836-2157 - www.q-te ch.com
QPDS-0008 (Revision A, June 2013) (ECO # 10907)
3 of 7
QT481 AND QT488 SERIES
Q-TECH
CORPORATION
ULTRA-LOW CURRENT REAL TIME CLOCK OSCILLATORS
2.5Vdc and 3.3Vdc - 32.768kHz
Ordering Information
QT 488 L D 1 0M-32.768kHz
Q T 4 88 L D 10 M - 32.768kHz
Solder Dip Option:
T = Standard
S = Solder Dip
(*)
G = Solder Dip (*)
Ultra-Low Current
Real Time Clock Oscillator
Package:
(See page 3)
(Sample part number)
Output Frequency
Screening Option:
Blank=No Screening
M=Per MIL-PRF-55310, Level B
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
7 = ± 75ppm at -55ºC to +125ºC
9 = ± 50ppm at -55ºC to +125ºC
10 = ± 100ppm at -55ºC to +125ºC
11 = ± 50ppm at -40ºC to +85ºC
12 = ± 100ppm at -40ºC to +85ºC
Logic & Supply Voltage:
L = LVHCMOS +3.3V
N = LVHCMOS +2.5V
Tristate Option:
Blank = No Tristate
D = Tristate
For Non-Standard requirements, contact Q-Tech Corporation at Sales@Q-Tech.com
(*) Hot Solder Dip options for an additional cost:
S = Sn60/Pb40 per MIL-PRF 55310
G = Lead free Alloy SAC305 (96.5% Sn, 3% Ag, 0.5% Cu)
(**) Frequency stability vs. temperature codes may not be available in all frequencies.
Packaging Options
• Standard packaging in anti-static plastic tube (60 pcs/tube)
• Tape and Reel (800 pcs/reel) is available for an additional charge.
Other Options Available For An Additional Charge
• P. I. N. D. test
(MIL-STD 883, Method 2020)
Specifications subject to change without prior notice.
Q-TECH Corporation - 10150 W. Jefferson Boulevard, Culver City 90232 - Tel: 310-836-7900 - Fax: 310-836-2157 - www.q-te ch.com
QPDS-0008 (Revision A, June 2013) (ECO # 10907)
4 of 7
QT481 AND QT488 SERIES
Q-TECH
Output Waveform (Typical)
CORPORATION
ULTRA-LOW CURRENT REAL TIME CLOCK OSCILLATORS
2.5Vdc and 3.3Vdc - 32.768kHz
Test Circuit
Typical test circuit for CMOS logic
+ mA
+
Power
supply
-
+
Vdc
-
4
3
Output
QT88
0.1µF
or
1
2
0.01µF
15pF
(*)
10k
Ground
Tristate Function
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.
(*) CL includes probe and jig capacitance
Frequency vs. Temperature Curve
Type: QT88LD8M Vcc Input:3.3 Out Freq:32.768Khz +/-250ppm@ 0 to 200 deg.C
250
200
150
Frequency Stability (PPM)
Start up Time
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
Temperature (°C)
Thermal Characteristics
The heat transfer model in a hybrid package is described in figure 1.
D/A epoxy
Die
D/A epoxy
45º
Heat
Hybrid Case
45º
Substrate
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.
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.
R1
R2
R3
R4
R5
Die
D/A epoxy
(Figure 1)
Substrate
D/A epoxy
Hybrid Case
T
CA
A
T
C
JC
T
J
Die
JC
CA
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
QPDS-0008 (Revision A, June 2013) (ECO # 10907)
JA
Q-TECH Corporation - 10150 W. Jefferson Boulevard, Culver City 90232 - Tel: 310-836-7900 - Fax: 310-836-2157 - www.q-te ch.com
(Figure 2)
5 of 7
