KMC7457VG1267LC Freescale Semiconductor, KMC7457VG1267LC Datasheet - Page 52

• Manufacturer Part Number: KMC7457VG1267LC
• Description: IC MPU RISC 32BIT 1267MHZ 483BGA
• Manufacturer: Freescale Semiconductor

Specifications of KMC7457VG1267LC

• Processor Type: MPC74xx PowerPC 32-Bit
• Speed: 1.267GHz
• Voltage: 1.3V
• Mounting Type: Surface Mount
• Package / Case: 483-FCCBGA
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Features: -

System Design Information
9.1.3
Spread spectrum clock sources are an increasingly popular way to control electromagnetic interference
emissions (EMI) by spreading the emitted noise to a wider spectrum and reducing the peak noise
magnitude in order to meet industry and government requirements. These clock sources intentionally add
long-term jitter in order to diffuse the EMI spectral content. The jitter specification given in
considers short-term (cycle-to-cycle) jitter only and the clock generator’s cycle-to-cycle output jitter
should meet the MPC7457 input cycle-to-cycle jitter requirement. Frequency modulation and spread are
separate concerns, and the MPC7457 is compatible with spread spectrum sources if the recommendations
listed in
It is imperative to note that the processor’s minimum and maximum SYSCLK, core, and VCO frequencies
must not be exceeded regardless of the type of clock source. Therefore, systems in which the processor is
operated at its maximum rated core or bus frequency should avoid violating the stated limits by using
down-spreading only.
52
Notes:
1. The core and L3 frequencies are for reference only. Note that maximum L3 frequency is design dependent. Some examples
2. Not all core frequencies are supported by all speed grades; see
Frequency
(MHz)
may represent core or L3 frequencies which are not useful, not supported, or not tested for the MPC7457; see
“L3 Clock AC Specifications,”
specifications.
Core
1050
1100
1150
1200
1250
1300
2
Table 20
At recommended operating conditions. See
Frequency modulation
Frequency spread
Notes:
1. Guaranteed by design.
2. SYSCLK frequencies resulting from frequency spreading, and the resulting core and VCO
System Bus Clock (SYSCLK) and Spread Spectrum Sources
frequencies, must meet the minimum and maximum specifications given in
525
550
575
600
638
650
÷2
are observed.
÷2.5
420
440
460
480
500
520
Table 20. Spread Specturm Clock Source Recommendations
MPC7457 RISC Microprocessor Hardware Specifications, Rev. 7
Table 19. Sample Core-to-L3 Frequencies
for valid L3_CLK frequencies and for more information regarding the maximum L3 frequency.
350
367
383
400
417
433
Parameter
÷3
÷3.5
300
314
329
343
357
371
Table
263
275
288
300
313
325
÷4
4.
÷4.5
233
244
256
267
278
289
Table 8
191
200
209
218
227
236
÷5
Min
—
—
for minimum and maximum core frequency
÷5.5
191
200
209
218
227
236
1
(continued)
Max
1.0
50
175
183
192
200
208
217
÷6
Table
÷6.5
162
169
177
185
192
200
8.
Unit
kHz
%
Freescale Semiconductor
150
157
164
171
179
186
÷7
Notes
1, 2
1
Table 8
÷7.5
Section 5.2.3,
140
147
153
160
167
173
131
138
144
150
156
163
÷8