Datasheet

ST72334J/N, ST72314J/N, ST72124J
118/153
CLOCK AND TIMING CHARACTERISTICS (Cont’d)
16.5.3.2 Typical Ceramic Resonators
Note:
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).
Figure 69. 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 Table 22 and Table 23 and to the ceramic resonator manufacturer’s documentation for more details.
Symbol Parameter Conditions Typ Unit
t
SU(osc)
Ceramic resonator start-up time
LP
2MHz
4.2
ms
MP
4MHz
2.1
MS
8MHz
1.1
HS
16MHz
0.7
OSC2
OSC1
f
OSC
C
L1
C
L2
i
2
R
F
ST72XXX
RESONATOR
WHEN RESONATOR WITH
INTEGRATED CAPACITORS
R
D
R
F(EXT)