DSPB56721AG Freescale Semiconductor, DSPB56721AG Datasheet - Page 14

• Manufacturer Part Number: DSPB56721AG
• Description: AUDIO PROCESSOR SYMPH 144-LQFP
• Manufacturer: Freescale Semiconductor
• Series: Symphony™r
• Type: Audio Processorr

Specifications of DSPB56721AG

• Interface: Host Interface, I²C, SAI, SPI
• Clock Rate: 200MHz
• Non-volatile Memory: External
• On-chip Ram: 744kB
• Voltage - I/o: 3.30V
• Voltage - Core: 1.00V
• Operating Temperature: 0°C ~ 70°C
• Mounting Type: Surface Mount
• Package / Case: 144-LQFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

If the DSP56720/DSP56721 system clock is an externally supplied square wave voltage source, it is connected to EXTAL
(Figure
Table 6
Notes:
1. Measured at 50% of the input transition.
2. The indicated duty cycle is for the specified maximum frequency for which a part is rated. The minimum clock high or low time
14
required for correct operation, however, remains the same at lower operating frequencies; therefore, when a lower clock
frequency is used, the signal symmetry may vary from the specified duty cycle as long as the minimum high time and low time
requirements are met.
No.
1
2
3
4
10). When the external square wave source is connected to EXTAL, the XTAL pin is not used.
lists the clock operation.
C
EXTAL input high
(40% to 60% duty cycle)
EXTAL input low
(40% to 60% duty cycle)
EXTAL cycle time
Instruction cycle time
• Crystal oscillator
• Square wave input
• Crystal oscillator
• Square wave input
• With PLL disabled
• With PLL enabled
• With PLL disabled
• With PLL enabled
EXTAL
Note:
XTAL1
EXTAL
Characteristics
R
Symphony
1
The midpoint is 0.5 (V
1
XTAL
V
IL
™
C
DSP56720/DSP56721 Multi-Core Audio Processors, Rev. 5
Figure 9. Using the On-Chip Oscillator
ETH
Figure 10. External Clock Timing
Suggested component values:
Fosc = 24.576 MHz
R = 1 M ±10%
C (EXTAL)= 18 pF
C (XTAL) = 18 pF
Calculations are for a 5 – 30 MHz crystal with the following parameters:
• Shunt capacitance (C
• Series resistance 40 Ohm
• Drive level of 10 μW
1
Table 6. Clock Operation
IH
+ V
3
ETL
IL
).
Symbol
Eth
Etc
Etl
Tc
2
ETC
0
) of 10 pF – 12 pF
16.67
16.67
33.3
5.00
5.00
Min
2.5
2.5
5
Midpoint
5120
Max
100
100
500
inf
inf
inf
inf
Freescale Semiconductor
V
IH
Units
ns
ns
ns
ns