DS32KHZ Maxim Integrated Products, DS32KHZ Datasheet

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DS32KHZ

Manufacturer Part Number
DS32KHZ
Description
Manufacturer
Maxim Integrated Products
Datasheet

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GENERAL DESCRIPTION
The DS32kHz is a temperature-compensated
crystal
frequency of 32.768kHz. This device addresses
applications
accuracy, and can be used to drive the X1 input
of most Dallas Semiconductor real-time clocks
(RTCs), chipsets, and other ICs containing
RTCs. This device is available in commercial
(DS32kHz)
temperature versions.
APPLICATIONS
GPS Receivers
Telematics
Network Timing and Synchronization in Servers,
Automatic Power Meters
PIN CONFIGURATIONS
www.maxim-ic.com
Routers, Hubs, and Switches
as
oscillator
and
requiring
(TCXO)
industrial
better
with
(DS32kHz-N)
timekeeping
an
output
32.768kHz Temperature-Compensated
FEATURES
ORDERING INFORMATION
#Denotes a RoHS-compliant device that may include lead that is exempt
under the RoHS requirements. The lead finish is JESD97 category e3, and
is compatible with both lead-based and lead-free soldering processes.
*A “#” anywhere on the top mark denotes a RoHS-compliant device. An “N”
denotes an industrial device.
DS32KHZ/DIP
DS32KHZN/DIP
DS32KHZS
DS32KHZS#
DS32KHZSN
DS32KHZSN#
DS32KHZ/WBGA
DS32KHZN/WBGA
1 of 8
Accurate to ±4 Minutes/Year (-40°C to +85°C)
Accurate to ±1 Minute/Year (0°C to +40°C)
Battery Backup for Continuous Timekeeping
V
Grounded
V
Operating Temperature Range:
No Calibration Required
Low-Power Consumption
Surface Mountable Using BGA Package
UL Recognized
PART
BAT
CC
0°C to +70°C (Commercial)
-40°C to +85°C (Industrial)
Operating Voltage: 4.5V to 5.5V
Operating Voltage: 2.7V to 5.5V with V
-40ºC to +85ºC
-40ºC to +85ºC
-40ºC to +85ºC
-40ºC to +85ºC
0ºC to +70ºC
0ºC to +70ºC
0ºC to +70ºC
0ºC to +70ºC
RANGE
TEMP
Crystal Oscillator
PIN-
PACKAGE
14 DIP
14 DIP
16 SO (0.300”)
16 SO (0.300”)
16 SO (0.300”)
16 SO (0.300”)
36 BGA
36 BGA
DS32kHz
CC
REV: 080607
TOP MARK*
DS32KHZ
DS32KHZ-N
DS32KHZS
DS32KHZS
DS32KHZSN
DS32KHZSN
DS32KHZ
DS32KHZ-N

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DS32KHZ Summary of contents

Page 1

... GENERAL DESCRIPTION The DS32kHz is a temperature-compensated crystal oscillator (TCXO) with frequency of 32.768kHz. This device addresses applications requiring better accuracy, and can be used to drive the X1 input of most Dallas Semiconductor real-time clocks (RTCs), chipsets, and other ICs containing RTCs. This device is available in commercial ...

Page 2

ABSOLUTE MAXIMUM RATINGS Voltage Range on Any Pin Relative to Ground………………………………………………………………-3.0V to +7.0V Operating Temperature Range (Noncondensing) Commercial:…………………………………………………………………………………………………..0°C to +70°C Industrial:……………………………………………………………………………………………………-40°C to +85°C Storage Temperature Range………………………………………………………………………………….-40°C to +85°C Soldering Temperature (BGA, SO)……………………….See the Handling, PC Board Layout, and Assembly section. ...

Page 3

... Crystal Aging (First Year) These parameters are measured using a 15pF load. Note 8: Error is measured from the nominal supply voltage of whichever supply is powering the device. Note 9: After reflow. Note 10: Figure 1. DS32kHz Output Waveform SYMBOL CONDITIONS f OUT 0°C to +40°C ∆f/f -40°C to +85° 0° ...

Page 4

TYPICAL OPERATING CHARACTERISTICS (V = 3.3V +25°C, unless otherwise noted versus V BAT BAT 4.5 4 3.5 3 2.5 2 1.5 2.7 3.2 3.7 4.2 4.7 5.2 V (V) BAT I vs. V vs. output ...

Page 5

... FUNCTIONAL DESCRIPTION The DS32kHz is a temperature-compensated crystal oscillator (TCXO) that outputs a 32,768Hz square wave. While the DS32kHz is powered by either supply input, the device measures the temperature every 64 seconds and adjusts the output frequency. The device requires four pins for operation: V Figure 4 for connection schemes ...

Page 6

... The DS32kHz is packaged in a 36-pin ball grid array (BGA). It also is available in a 16-pin 0.300” SO and a 14-pin encapsulated DIP (EDIP) module. The additional PC board space required to add the DS32kHz as an option for driving a RTC is negligible in many applications (see Figure 6) Therefore, adding the DS32kHz to new designs and future board revisions allows the use of the DS32kHz where applications require improved timekeeping accuracy ...

Page 7

... RTC as well. BAT can be used to reduce the current consumption of a DS32kHz and an RTC. The values of R1 and C1 may vary depending on the RTC used. However, values of 1.0MΩ and 100pF are recommended as a starting point used to shift the input waveform to the proper level. The recommended value for R2 is 33kΩ ...

Page 8

... Application Note 58: Crystal Considerations with Dallas Real-Time Clocks Application Note 701: Using the DS32kHz with Dallas RTCs HANDLING, PC BOARD LAYOUT, AND ASSEMBLY These packages contain a quartz tuning-fork crystal. Pick-and-place equipment may be used, but precautions should be taken to ensure that excessive shocks are avoided. Ultrasonic cleaning should be avoided to prevent damage to the crystal ...

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