Abstract: When choosing an independent real-time clock (RTC), Maxim can now provide a package with integrated quartz crystal for your choice. This new package integrates a serial interface (I²C, 3-wire, or SPI ™) RTC device and a matching 32.768kHz quartz crystal into a single 16-lead SO package.
The following are frequently asked questions about the use of this new package with integrated quartz crystal: Which real-time clocks can provide this package? Devices that offer this packaging option are DS1337, DS1338, DS1339, DS1340, DS1374, DS3231, DS3232, DS3234, and DS32X35. More devices will provide this package in the future.
The device model with this package has the suffix 'C'. For example, DS1337C means DS1337 with integrated crystal package. The DS3231, DS3232, DS3234, and DS32X35 are not named according to this naming convention because the device only has a built-in crystal package. Therefore, there is no need to encapsulate the indication mark. Do other Maxim devices use this package? This SO package with integrated crystal provides a new package option for the DS32KHZS 32.768kHz temperature-compensated crystal oscillator (TCXO). What is the package size? This package is a standard 300mil wide, 16-pin or 20-pin SO package. For the 16-pin package, the size is 400mil x 300mil x 100mil; for the 20-pin package, the size is 500mil x 300mil x 100mil. Downloadable technical package drawings. What are the benefits of the new packaging options? Ensure that the RTC and the crystal work well (appropriate load capacitance and ESR). Eliminate the crystal procurement problem. Don't consider the crystal layout problem (PCB). Will the timing accuracy of the production steps be increased like the through-hole crystal? Because the leakage caused by the parasitic capacitance and impurities on the PCB is reduced, and the inappropriate crystal load capacitance is avoided, the timing accuracy is improved. The device data sheet gives the expected crystal accuracy at nominal VCC and room temperature (25 ° C). Does Dallas Semiconductor provide precision timing solutions? Yes, DS3231 is a high-precision I²C real-time clock with integrated RTC / TCXO / crystal, which can provide ± 2ppm frequency accuracy from 0 ° C to + 40 ° C, -40 ° C to 0 ° C and + 40 ° C The accuracy is ± 3.5ppm from + 85 ° C. Other devices, including DS3232, DS3234, and DS32X35, can also provide accurate timing. Compared with discrete components, does this new package increase cost? The total solution cost of the built-in crystal package is the same as the cost of discrete components (crystal and RTC). Are there any other special operation problems? This package contains a quartz crystal tuning fork crystal. Mounting equipment can be used, but care must be taken to avoid excessive impact. Ultrasonic cleaning should be avoided.
Moisture-sensitive packaging leaves the factory using moisture-proof packaging. The operating instructions listed on the package label must be followed to prevent damage to the device during the reflow process. For moisture sensitive device (MSD) classification, please refer to IPC / JEDEC J-STD-020 standard. Is there a PCB layout guide? Unless there is ground layer separation between the package and the signal line, it is recommended not to lay the signal line under the package. All NC (no connection) pins must be grounded. Are there any special requirements for reflow soldering of this package? RoHS packages must be soldered according to the reflow soldering characteristic curve in accordance with JEDEC J-STD-020 standard. How many reflows can this package withstand? Twice (up to). Does the package meet RoHS or lead-free (Pb-free) standards? The package has been certified to comply with RoHS 5/6 standards. As a piezoelectric device, the package has a lead-free exemption. For details, please refer to our lead-free information webpage, the device models with lead-free exemption are marked with "#".
The following are frequently asked questions about the use of this new package with integrated quartz crystal: Which real-time clocks can provide this package? Devices that offer this packaging option are DS1337, DS1338, DS1339, DS1340, DS1374, DS3231, DS3232, DS3234, and DS32X35. More devices will provide this package in the future.
The device model with this package has the suffix 'C'. For example, DS1337C means DS1337 with integrated crystal package. The DS3231, DS3232, DS3234, and DS32X35 are not named according to this naming convention because the device only has a built-in crystal package. Therefore, there is no need to encapsulate the indication mark. Do other Maxim devices use this package? This SO package with integrated crystal provides a new package option for the DS32KHZS 32.768kHz temperature-compensated crystal oscillator (TCXO). What is the package size? This package is a standard 300mil wide, 16-pin or 20-pin SO package. For the 16-pin package, the size is 400mil x 300mil x 100mil; for the 20-pin package, the size is 500mil x 300mil x 100mil. Downloadable technical package drawings. What are the benefits of the new packaging options? Ensure that the RTC and the crystal work well (appropriate load capacitance and ESR). Eliminate the crystal procurement problem. Don't consider the crystal layout problem (PCB). Will the timing accuracy of the production steps be increased like the through-hole crystal? Because the leakage caused by the parasitic capacitance and impurities on the PCB is reduced, and the inappropriate crystal load capacitance is avoided, the timing accuracy is improved. The device data sheet gives the expected crystal accuracy at nominal VCC and room temperature (25 ° C). Does Dallas Semiconductor provide precision timing solutions? Yes, DS3231 is a high-precision I²C real-time clock with integrated RTC / TCXO / crystal, which can provide ± 2ppm frequency accuracy from 0 ° C to + 40 ° C, -40 ° C to 0 ° C and + 40 ° C The accuracy is ± 3.5ppm from + 85 ° C. Other devices, including DS3232, DS3234, and DS32X35, can also provide accurate timing. Compared with discrete components, does this new package increase cost? The total solution cost of the built-in crystal package is the same as the cost of discrete components (crystal and RTC). Are there any other special operation problems? This package contains a quartz crystal tuning fork crystal. Mounting equipment can be used, but care must be taken to avoid excessive impact. Ultrasonic cleaning should be avoided.
Moisture-sensitive packaging leaves the factory using moisture-proof packaging. The operating instructions listed on the package label must be followed to prevent damage to the device during the reflow process. For moisture sensitive device (MSD) classification, please refer to IPC / JEDEC J-STD-020 standard. Is there a PCB layout guide? Unless there is ground layer separation between the package and the signal line, it is recommended not to lay the signal line under the package. All NC (no connection) pins must be grounded. Are there any special requirements for reflow soldering of this package? RoHS packages must be soldered according to the reflow soldering characteristic curve in accordance with JEDEC J-STD-020 standard. How many reflows can this package withstand? Twice (up to). Does the package meet RoHS or lead-free (Pb-free) standards? The package has been certified to comply with RoHS 5/6 standards. As a piezoelectric device, the package has a lead-free exemption. For details, please refer to our lead-free information webpage, the device models with lead-free exemption are marked with "#".
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