Specifications

ST72104Gx, ST72215Gx, ST72216Gx, ST72254Gx
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CLOCK AND TIMING CHARACTERISTICS (Cont’d)
Figure 65. Typical Application with Ceramic Resonator
Notes:
1. Resonator characteristics given by the ceramic resonator manufacturer.
2. t
SU(OSC)
is the typical oscillator start-up time measured between V
DD
=2.8V and the fetch of the first instruction (with a
quick V
DD
ramp-up from 0 to 5V (<50µs).
3. The oscillator selection can be optimized in terms of supply current using an high quality resonator with small R
S
value.
Refer to ceramic resonator manufacturer for more details.
OSC2
OSC1
f
OSC
C
L1
C
L2
i
2
R
F
ST72XXX
RESONATOR
WHEN RESONATOR WITH
INTEGRATED CAPACITORS
R
D
R
F(EXT)