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APR15/D bảng dữ liệu(PDF) 88 Page - NXP Semiconductors

tên linh kiện APR15/D
Giải thích chi tiết về linh kiện  24-BIT DIGITAL SIGNAL PROCESSOR
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APR15/D bảng dữ liệu(HTML) 88 Page - NXP Semiconductors

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4-14
DSP56001A/D, Rev. 1
MOTOROLA
DSP56001A
Application Examples
Figure 4-5
shows a circuit that waits until VCC on the DSP56001A is at least 4.5 V before initiating
a 75,000
× T
C oscillator stabilization delay required for the on-chip oscillator (only 25 × TC is
required for an external oscillator). This insures that the DSP is operational and stable before
releasing the reset signal.
Figure 4-5 Reset Circuit Using MC34064/MC33064
Note:
1.
IRQA, and IRQB must be driven to the logic levels appropriate for the application.
2.
MODA and MODB must be driven to the logic levels appropriate for the application.
RESET
1.2 VREF
+5V
MC34064
U1
MC33064
2 (2)
3 (4)
1 (1)
CDLY
R
tDLY = RCDLY In
1
1 -
VTH
VIN - VOL
Where:
Logic
Reset
tDLY = 75,000 TC minimum
VIN = 5 V
fOSC = 20 MHz
VTH = 2.5 V
VOL = 0.4 V
CDLY = 1 mf ± 20%
TC = 50 ns
R = 8.2 K
± 5%
+
–
AA0908
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com



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