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SM320C50PQI80EP Datasheet(PDF) 11 Page - Texas Instruments

Part # SM320C50PQI80EP
Description  DIGITAL SIGNAL PROCESSOR
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
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SM320C50PQI80EP Datasheet(HTML) 11 Page - Texas Instruments

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SM320C50EP
DIGITAL SIGNAL PROCESSOR
SGUS040A − AUGUST 2002 − REVISED JANUARY 2006
11
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
POST OFFICE BOX 1443
HOUSTON, TEXAS 77251−1443
CLOCK CHARACTERISTICS AND TIMING
The C50 can use either its internal oscillator or an external frequency source for a clock. The clock mode is
determined by the CLKMD1 and CLKMD2 pins. Table 3 outlines the selection of the clock mode by these pins.
Table 3. Clock Mode Selection
CLKMD1
CLKMD2
CLOCK SOURCE
1
0
External divide-by-one clock option
0
1
Reserved for test purposes
1
1
External divide-by-two option or internal divide-by-two clock option
with an external crystal
0
0
External divide-by-two option with the internal oscillator disabled
internal divide-by-two clock option with external crystal
The internal oscillator is enabled by connecting a crystal across X1 and X2/CLKIN. The frequency of CLKOUT1
is one-half the crystal oscillating frequency. The crystal should be in either fundamental or overtone operation
and parallel resonant, with an effective series resistance of 30
Ω and a power dissipation of 1 mW; it should be
specified at a load capacitance of 20 pF. Overtone crystals require an additional tuned LC circuit. Figure 4 shows
an external crystal (fundamental frequency) connected to the on-chip oscillator.
recommended operating conditions for internal divide-by-two clock option
MIN
NOM
MAX
UNIT
fx
Input clock frequency
0 †
66
MHz
C1, C2
Load capacitance
10
pF
† This device uses a fully static design and, therefore, can operate with tc(CI) approaching ∞. The device is characterized at frequencies
approaching 0 Hz but is tested at a minimum of 3.3 MHz to meet device test time requirements.
X1
X2 /CLKIN
C1
C2
Crystal
Figure 4. Internal Clock Option


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