Philips LPC214 Series User Manual page 19

Philips Semiconductors
Volume 1
Table 7:
Fundamental
oscillation frequency
F
5 MHz - 10 MHz
10 MHz - 15 MHz
15 MHz - 20 MHz
20 MHz - 25 MHz
25 MHz - 30 MHz
User manual
LPC2141/2/4/6/8
X1 X2
C
C
Clock
a)
Fig 6. Oscillator modes and models: a) slave mode of operation, b) oscillation mode of
operation, c) external crystal model used for C
Recommended values for C
components parameters)
Crystal load
capacitance C
OSC
1 MHz - 5 MHz 10 pF
20 pF
30 pF
10 pF
20 pF
30 pF
10 pF
20 pF
30 pF
10 pF
20 pF
30 pF
10 pF
20 pF
30 pF
10 pF
20 pF
30 pF
Rev. 01 — 15 August 2005
LPC2141/2/4/6/8
X1 X2
Xtal
C
C
X2
X1
b)
in oscillation mode (crystal and external
X1/X2
Maximum crystal
series resistance R
L
NA
NA
< 300 Ω
< 300 Ω
< 300 Ω
< 300 Ω
< 300 Ω
< 220 Ω
< 140 Ω
< 220 Ω
< 140 Ω
< 80 Ω
< 160 Ω
< 90 Ω
< 50 Ω
< 130 Ω
< 50 Ω
NA
UM10139
Chapter 3: System Control Block
L
< = >
C
L
R
S
c)
/ evaluation
X1 X2
External load
capacitors C
S
NA
NA
58 pF, 58 pF
18 pF, 18 pF
38 pF, 38 pF
58 pF, 58 pF
18 pF, 18 pF
38 pF, 38 pF
58 pF, 58 pF
18 pF, 18 pF
38 pF, 38 pF
58 pF, 58 pF
18 pF, 18 pF
38 pF, 38 pF
58 pF, 58 pF
18 pF, 18 pF
38 pF, 38 pF
NA
© Koninklijke Philips Electronics N.V. 2005. All rights reserved.
C
P
,
X1 CX2
19