XC7SHU04_1 © NXP B.V. 2009. All rights reserved.
Product data sheet Rev. 01 — 7 September 2009 9 of 14
NXP Semiconductors
XC7SHU04
Inverter
Table 11. External components for resonator (f < 1 MHz)
All values given are typical and must be used as an initial set-up.
Frequency R1 R2 C1 C2
10 kHz to 15.9 kHz 22 MΩ 220 kΩ 56 pF 20 pF
16 kHz to 24.9 kHz 22 MΩ 220 kΩ 56 pF 10 pF
25 kHz to 54.9 kHz 22 MΩ 100 kΩ 56 pF 10 pF
55 kHz to 129.9 kHz 22 MΩ 100 kΩ 47 pF 5 pF
130 kHz to 199.9 kHz 22 MΩ 47 kΩ 47 pF 5 pF
200 kHz to 349.9 kHz 22 MΩ 47 kΩ 47 pF 5 pF
350 kHz to 600 kHz 22 MΩ 47 kΩ 47 pF 5 pF
Table 12. Optimum value for R2
Frequency R2 Optimum for
3 kHz 2.0 kΩ minimum required I
CC
8.0 kΩ minimum influence due to change in V
CC
6 kHz 1.0 kΩ minimum required I
CC
4.7 kΩ minimum influence by V
CC
10 kHz 0.5 kΩ minimum required I
CC
2.0 kΩ minimum influence by V
CC
14 kHz 0.5 kΩ minimum required I
CC
1.0 kΩ minimum influence by V
CC
> 14 kHz - replace R2 by C3 with a typical value of 35 pF
