Atmel ATmega645, Application Note

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Atmel AVR543
5
8423A-AVR-11/11
4 Appendix A
Table 4-1 is a selection of crystals that meet the ESR requirements of the Atmel
ATmega645A/6450A/649A/6490A. The crystals are listed based on datasheet
information and are not tested with the actual device. Any other crystal that complies
with the ESR requirements can also be used. Availability and RoHS compliance has
not been investigated.
Table 4-1. Examples of crystals compliant with ATmega645A/6450A/649A/6490A low-frequency crystal oscillator.
Vendor Type
Mounting
(SMD/HOLE)
Frequency
Tolerance [±ppm]
Load Capacitance
[pF]
Equivalent Series
Resistance (ESR)
[k Ω ]
C-MAC WATCH CRYSTALS HOLE 20 6 50
C-MAC 85SMX SMD 20 6 55
C-MAC 90SMX SMD 20 6 60
ECLIPTEK E4WC HOLE 20 6 50
ENDRICH 90SMX SMD 5 6 50
EPSON
®
C-001R HOLE 20 6 -> 12.5 (specify) 35
EPSON C-002RX HOLE 20 6 -> 10 (specify) 50
EPSON C-004R HOLE 20 6 -> 10 (specify) 50
EPSON C-005R HOLE 20 6 -> 10 (specify) 50
EPSON MC-30A SMD 20 6 -> 10 (specify) 50
EPSON MC-306 SMD 20 6 -> 10 (specify) 50
EPSON MC-405 SMD 20 6 -> 10 (specify) 50
EPSON MC-406 SMD 20 6 -> 10 (specify) 50
GOLLEDGE GWX HOLE 5 6, 8 or 12.5 35
GOLLEDGE GSWX-26 SMD 10 6 , 8 or 12.5 35
GOLLEDGE GDX1 HOLE 10 6 42
GOLLEDGE GSX-200 SMD 5 6 50
IQD WATCH CRYSTALS HOLE 20 6 50
IQD 90SMX HOLE 10 6 60
IQD 91SMX HOLE 10 6 60
MICROCRYSTAL MS3V-T1R HOLE 20 7 or 9 65
MICROCRYSTAL MS2V-T1R HOLE 20 7 or 9 65
MICROCRYSTAL CC4V-T1A SMD 30 9 65
MICROCRYSTAL CC1V-T1A SMD 30 9 60
MICROCRYSTAL CC7V-T1A SMD 30 9 70
MMD WC26 HOLE 8 8 35
MMD WC38 HOLE 8 8 35
MMD WC155 HOLE 8 8 40
MMD WCSMC SMD 20 6 50
OSCILENT SERIES 111 HOLE 10 6 or 12.5 30
OSCILENT SERIES 112 HOLE 10 6 or 12.5 40