Q-Tech QT488 User Manual

Q-TECH

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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 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

QT481 AND QT488 SERIES

ULTRA-LOW CURRENT REAL TIME CLOCK OSCILLATORS

2.5Vdc and 3.3Vdc - 32.768kHz

(*) 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: 91% AL2O

• Lead material: Kovar

• Lead finish:

Gold Plated: 50μ ~ 80μ inches

Nickel Underplate: 100μ ~ 250μ inches

• Weight: 0.6g typ., 3.0g max.

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QPDS-0008 (Revision A, June 2013) (ECO # 10907)

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Electrical Characteristics

Parameters +3.3Vdc +2.5Vdc

QT481 AND QT488 SERIES

ULTRA-LOW CURRENT REAL TIME CLOCK OSCILLATORS

2.5Vdc and 3.3Vdc - 32.768kHz

Output frequency range (Fo)

Supply voltage (Vdd)

Maximum Applied Voltage
(Vdd max.)

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)

Symmetry
(50% of ouput waveform)

Rise and Fall times
(Tr, Tf betweeen 10% and 90% of output waveform)

Output Load

Start-up time (Tstup) 10ms max.

Output voltage (Voh/Vol)

Output Current (Ioh/Iol)

Enable/Disable function Pin 1

+3.3Vdc ± 10%

0.42 mA typ., 0.7mA max.

50/50% typ., 45/55% max.

0.9 x Vdd min.; 0.1 x Vdd max.

VIL ≤ 0.3Vdd: High Impedance

Stand-by current: 10µA max.

32.768kHz

+5Vdc

0.2µs typ., 1µs max.

15pF

± 2mA min.

VIH ≥ 0.7Vdd: Active

+2.5Vdc ± 10%

0.24 mA typ., 0.5mA max.

Aging ± 5ppm max. first year / ± 2ppm max. per year thereafter

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QPDS-0008 (Revision A, June 2013) (ECO # 10907)

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(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

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 ± .003

(1.52 ± 0.08)

(.203)

0.008

(1.40 ± 0.08)

0.055 ± .003

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

3º to 5º typ.

detail A’

A’

(1.40 ± 0.08)

0.055± .003

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 ± .003

(1.52 ± 0.08)

(2.54)

0.100
max.

0.018±.003

(.46±0.08)

(0.20)

0.008

0.028

(0.72)

2

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1

P/N
FREQ.
D/C S/N

A’

3º to 5º typ.

detail A’

.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

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)

12

43

Q-TECH
P/N
FREQUENCY
D/C S/N

1

2

4

3

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)

(.203)

FREQ.

Q-TECH

D/C S/N

0.315 max.

0.200±.005

0.008

MAX.

P/N

.190 MAX.

(4.826 MAX.)

(.203)

(8.00 max.)

(10.16 ± .13)

.008

.315 max.

.400 TYP.

1

2

4

3

.350 ± .005

.290 ± .005

.100 ± .005

.200 ± .005

(8.89 ± .13)

(7.37 ± .13)

(2.54 ± .13)

(5.08 ± .13)

FREQ.

Q-TECH

D/C S/N

4 X

.048 ± .002

(1.22 ± .051)

4 X

.018 ± .003

(.457 ± .076)

P/N

4 X

.290 ± .005

.190 MAX.

(1.396 ± .13)

.200 ± .005

.048 ± .002

(1.22 ± .051)

(7.37 ± .13)

(5.08 ± .13)

.100 ± .005

(2.54 ± .13)

(4.826 MAX.)

(.203) (2.794 ± .13)

(8.00 max.)

.315 max.

.055 ± .005

.008

.110 ± .005

1 2

43

.350 ± .005

(8.89 ± .13)

4 X

.018 ± .003

(.457 ± .076)

Q-TECH
P/N
FREQ.
D/C S/N

ULTRA-LOW CURRENT REAL TIME CLOCK OSCILLATORS

COR PORATI ON

Package Outline and Pin Connections - Dimensions are in inches (mm)

QT481 AND QT488 SERIES

2.5Vdc and 3.3Vdc - 32.768kHz

QT481

QT488

QT482

QT489

QT483

QT490

QT484

QT492

QPDS-0008 (Revision A, June 2013) (ECO # 10907)

Pin No.

1
2
3
4

Function

TRISTATE or NC

GND/CASE

OUTPUT

VDD

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Ordering Information

Solder Dip Option:
T = Standard
S = Solder Dip (*)
G = Solder Dip (*)

QT481 AND QT488 SERIES

ULTRA-LOW CURRENT REAL TIME CLOCK OSCILLATORS

2.5Vdc and 3.3Vdc - 32.768kHz

(Sample part number)

QT488 L D 1 0 M - 32.768kHz

Q T 4 88 L D 10 M - 32.768kHz

Output Frequency

Ultra-Low Current
Real Time Clock Oscillator

Package:

(See page 3)

Logic & Supply Voltage:

L = LVHCMOS +3.3V

N = LVHCMOS +2.5V

Tristate Option:

Blank = No Tristate

D = Tristate

Blank=No Screening

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

Screening Option:

M=Per MIL-PRF-55310, Level B

Frequency vs. Temperature Code (**) :

(*) 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.

For Non-Standard requirements, contact Q-Tech Corporation at [e-mail]

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

Specifications subject to change without prior notice.

Q-T ECH Co rpo rat ion - 1 015 0 W. J efferson Boulevard, Culver City 90232 - Tel: [phone] - Fax: [phone] - www.q-t e c h.c om

QPDS-0008 (Revision A, June 2013) (ECO # 10907)

(MIL-STD 883, Method 2020)

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-

-

Output

Ground

4

3

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

-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)

Typ e: QT88LD8M Vcc Input:3.3 Out Freq:32.768Khz +/-250ppm@ 0 to 200 deg.C

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

T

C

A

J

CA

JC

COR PORATI ON

QT481 AND QT488 SERIES

ULTRA-LOW CURRENT REAL TIME CLOCK OSCILLATORS

2.5Vdc and 3.3Vdc - 32.768kHz

Output Waveform (Typical)

Frequency vs. Temperature Curve

Test Circuit

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.

Start up Time

Thermal Characteristics

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

Q-T ECH Co rpo rat ion - 1 015 0 W. J efferson Boulevard, Culver City 90232 - Tel: [phone] - Fax: [phone] - www.q-t e c h.c om

QPDS-0008 (Revision A, June 2013) (ECO # 10907)

(Figure 1)

(Figure 2)

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Q-TECH

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

P/N

FREQUENCY

D/C S/N

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

COR PORATI ON

QT481 AND QT488 SERIES

ULTRA-LOW CURRENT REAL TIME CLOCK OSCILLATORS

2.5Vdc and 3.3Vdc - 32.768kHz

Reflow Profile

The five transition periods for the typical reflow process are:

• Preheat

• Flux activation

• Thermal equalization

• Reflow

• Cool down

Environmental Specifications

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:

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

QPDS-0008 (Revision A, June 2013) (ECO # 10907)

Embossed Tape and Reel Information For QT488

Dimensions are in mm. Tape is compliant to EIA-481-A.

Reel size vs. quantity:

Reel size (Diameter in mm)

178
330

Environmental Test Test Conditions

• 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

Q-T ECH Co rpo rat ion - 1 015 0 W. J efferson Boulevard, Culver City 90232 - Tel: [phone] - Fax: [phone] - www.q-t e c h.c om

Please contact Q-Tech for higher shock requirements

Qty per reel (pcs)

150
800

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QT481 AND QT488 SERIES

Q-TECH

COR PORATI ON

ULTRA-LOW CURRENT REAL TIME CLOCK OSCILLATORS

2.5Vdc and 3.3Vdc - 32.768kHz

Revision History

ECO REV REVISION SUMMARY PAGE DATE

- Initial Release 10/26/2010

Change Package Material from 90% to 91% 1

10907 A

Add Lead Free Tinning to Solder Dip Option

Add Code 7 to Frquency vs. Temperature Code table

Add document number to footer All

4

6/13/2013

Q-T ECH Co rpo rat ion - 1 015 0 W. J efferson Boulevard, Culver City 90232 - Tel: [phone] - Fax: [phone] - www.q-t e c h.c om

QPDS-0008 (Revision A, June 2013) (ECO # 10907)

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