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ST7SCR Datasheet(PDF) 81 Page - STMicroelectronics

Part # ST7SCR
Description  8-BIT LOW-POWER, FULL-SPEED USB MCU WITH 16K FLASH, 768 RAM, SMARTCARD I/F, TIMER
PDF  102 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

ST7SCR Datasheet(HTML) 81 Page - STMicroelectronics

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ST7SCR
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CLOCK AND TIMING CHARACTERISTICS (Cont’d)
14.4.3 Crystal Resonator Oscillators
The ST7 internal clock is supplied with one Crystal
resonator oscillator. All the information given in
this paragraph are based on characterization re-
sults with specified typical external componants. In
the application, the resonator and the load capaci-
tors have to be placed as close as possible to the
oscillator pins in order to minimize output distortion
and start-up stabilization time. Refer to the crystal
resonator manufacturer for more details (frequen-
cy, package, accuracy...).
Figure 39. Typical Application with a Crystal Resonator
Notes:
1. Resonator characteristics given by the crystal resonator manufacturer.
2. tSU(OSC) is the typical oscillator start-up time measured between VDD=2.8V and the fetch of the first instruction (with a
quick VDD 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 RS value.
Refer to crystal resonator manufacturer for more details.
Symbol
Parameter
Conditions
Min
Typ
Max
Unit
fOSC
Oscillator Frequency 3)
MP: Medium power oscillator
4
MHz
RF
Feedback resistor
20
40
k
Ω
CL1
CL2
Recommanded load capaci-
tances versus equivalent se-
rial resistance of the crystal
resonator (RS)
See Table 4 on page 20 (MP oscillator)
22
56
pF
i2
OSC2 driving current
VDD=5V
VIN=VSS
(MP oscillator)
110
190
µA
Oscil.
Typical Crystal Resonator
CL1
[pF]
CL2
[pF]
tSU(osc)
[ms] 2)
Reference
Freq.
Characteristic 1)
MP JAUCH
SS3-400-30-30/30 4MHz
∆f
OSC=[±30ppm25°C,±30ppm
∆Ta], Typ. RS=60Ω
33
34
7~10
OSC2
OSC1
fOSC
CL1
CL2
i2
RF
ST7XXX
RESONATOR
WHEN RESONATOR WITH
INTEGRATED CAPACITORS



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