ADSP-BF522/ADSP-BF523/ADSP-BF524/ADSP-BF525/ADSP-BF526/ADSP-BF527
Clock Related Operating Conditions
for ADSP-BF523/ADSP-BF525/ADSP-BF527 Processors
Table 15 describes the core clock timing requirements for the
ADSP-BF523/ADSP-BF525/ADSP-BF527 processors. Take care
Use the nominal voltage setting ( Table 15 ) for internal and
external regulators.
in selecting MSEL, SSEL, and CSEL ratios so as not to exceed the
maximum core clock and system clock (see Table 17 ). Table 16
describes phase-locked loop operating conditions.
Table 15. Core Clock (CCLK) Requirements (All Instruction Rates 1 ) for ADSP-BF523/ADSP-BF525/ADSP-BF527 Processors
Parameter
Nominal Voltage Setting
Max
Unit
f CCLK
f CCLK
f CCLK
f CCLK
Core Clock Frequency (V DDINT =1.14 V minimum)
Core Clock Frequency (V DDINT =1.093 V minimum)
Core Clock Frequency (V DDINT = 1.045 V minimum) 4
Core Clock Frequency (V DDINT = 0.95 V minimum)
1.20 V
1.15 V
1.10 V
1.0 V
600 2
533 3
400
400
MHz
MHz
MHz
MHz
1
2
3
4
Applies to 600 MHz models only. See the Ordering Guide on Page 88 .
Applies to 533 MHz and 600 MHz models only. See the Ordering Guide on Page 88 .
Applies only to automotive products. See Automotive Products on Page 87 .
Table 16. Phase-Locked Loop Operating Conditions for ADSP-BF523/ADSP-BF525/ADSP-BF527 Processors
Parameter
Min
Max
Unit
f VCO
Voltage Controlled Oscillator (VCO) Frequency
60
Instruction Rate 1
MHz
(Commercial/Industrial Models)
f VCO
Voltage Controlled Oscillator (VCO) Frequency
70
Instruction Rate 1
MHz
(Automotive Models)
1
Table 17. SCLK Conditions for ADSP-BF523/ADSP-BF525/ADSP-BF527 Processors
V DDEXT /V DDMEM
1.8 V Nominal 1
V DDEXT /V DDMEM
2.5 V or 3.3 V Nominal
Parameter
Max
Max
Unit
f SCLK
CLKOUT/SCLK Frequency (V DDINT ≥ 1.14 V)
2
100
133 3
MHz
f SCLK
CLKOUT/SCLK Frequency (V DDINT < 1.14 V) 2
100
100
MHz
1
2
3
If either V DDEXT or V DDMEM are operating at 1.8 V nominal, f SCLK is constrained to 100 MHz.
f SCLK must be less than or equal to f CCLK and is subject to additional restrictions for SDRAM interface operation. See Table 38 on Page 47 .
Rounded number. Actual test specification is SCLK period of 7.5 ns. See Table 38 on Page 47 .
Rev. D |
Page 31 of 88 | July 2013
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