SAA5265 Просмотр технического описания (PDF) - Philips Electronics
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SAA5265 Datasheet PDF : 24 Pages
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Philips Semiconductors
10 and 1 page intelligent teletext decoders
Preliminary specification
SAA5264; SAA5265
SYMBOL PARAMETER
CONDITIONS MIN.
TYP.
MAX.
UNIT
Crystal oscillator
XTALIN (PIN 41)
VIL
LOW-level input
voltage
VSSA −
−
V
VIH
HIGH-level input
voltage
−
−
VDDA
V
Ci
input capacitance
−
−
10
pF
XTALOUT (PIN 42)
Co
output capacitance
−
−
10
pF
Crystal specification; notes 2 and 3
fxtal(nom) nominal frequency fundamental
−
12
−
mode
MHz
CL
load capacitance
−
−
30
pF
Cmot
motional capacitance Tamb = 25 °C
−
−
20
fF
Rxtal
crystal resonance
Tamb = 25 °C
−
−
60
Ω
resistance
Cosc
Cxtal(hold)
capacitance at
XTALIN, XTALOUT
crystal holder
capacitance
Tamb = 25 °C
Tamb = 25 °C
−
2CL – Cchip – Cstray −
pF
−
−
35 – C-----2o---s---c – C-----c-2--h---i-p- – -C----s--2-t-r--a---y- pF
Txtal
crystal temperature
range
−20 +25
Xj
adjustment tolerance Tamb = 25 °C
−
−
Xd
drift
−
−
+85
°C
±50 × 10−6
±100 × 10−6
Notes
1. Periphery supply current is dependent on I/O external components and voltage levels.
2. Crystal order number 4322 143 05561. If crystal 4322 143 05561 is not used, then the formulae in the crystal
specification should be used.
3. Cosc may need to be reduced from the initially selected value. Cchip = 7 pF, the mean of the capacitances due to the
chip at XTALIN and at XTALOUT. Cstray is a value for the mean of the stray capacitances due to the external circuit
at XTALIN and XTALOUT. The maximum value for Cxtal(hold) is to ensure start-up.
2000 Jan 27
13
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