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 2020 Microchip Technology Inc.DS00003657A-page 1

AN3657

INTRODUCTION

This application note lists the Vectron high-reliability oscillator model numbers that have been characterized for use as

the External Clock of the ATmegaS64M1 series radiation tolerant microcontrollers. These oscillators are the only rec-

ommended external frequency sources for use as the ATmegaS64M1 External Clock. While other suppliers may offer

clocks that meet the specifications, they are not approved reference designs by Microchip, and, as such, the user must

complete his or her own qualification and analysis for fitness of use.

RECOMMENDED OSCILLATORS

The ATmegaS64M1 has three clock source options. This application note specifically addresses the external crystal

oscillators that are recommended for use with the External Clock. Two oscillator frequencies, 4MHz and 8MHz, are

recommended in the application note, though any frequency below 8 MHz may be used per Table 30-4 of the

ATmegaS64M1 data sheet. Four different reliability levels of the microcontroller are available. For each of these reliabil-

ity levels, the customer needs to ensure that the corresponding reliability level of the crystal oscillator is correctly spec-

ified to match the application. model numbers are defined in Eight individual oscillatorTable 1(one for each combination

of frequency and reliability level). These oscillators are directly coupled to the XTAL1 pad.

The models chosen are the most cost-effective solutions that meet the requirements of ATmegaS64M1 and the required

reliability level. The 1157 series oscillators recommended are from the Vectron Hi-Rel Oscillator standard OS-68338. All

the devices listed are 3.3V, CMOS, surface mount, 7 mm x 5 mm, ceramic leadless chip carrier oscillators. The subse-

quent paragraphs after Table 1 are provided for reference and compliance purposes.

TABLE 1:RECOMMENDED VECTRON HIGH-RELIABILITY OSCILLATOR MODELS AT TWO

EXTERNAL CLOCK FREQUENCIES

MCU ModelReliability LevelExternal Clock FrequencyOscillator Model Number

ATmegaS64M1-KH-EPrototype (-E)4 MHz1157D4M00000BX

ATmegaS64M1-KH-MQQML-Q equivalent4 MHz1157B4M00000BE

ATmegaS64M1-KH-SVQML-V equivalent4 MHz1157R4M00000BS

ATmegaS64M1-MA-HPHiREL Plastic4 MHz1157C4M00000BB

ATmegaS64M1-KH-EPrototype (-E)8 MHz1157D8M00000BX

ATmegaS64M1-KH-MQQML-Q equivalent8 MHz1157B8M00000BE

ATmegaS64M1-KH-SVQML-V equivalent8 MHz1157R8M00000BS

ATmegaS64M1-MA-HPHiREL Plastic8 MHz1157C8M00000BB

Crystal Oscillators for ATmegaS64M1 Radiation Tolerant

Microcontroller External Clock Input

Product specificaties