參數(shù)資料
型號: MPC745BPX350LE
廠商: MOTOROLA INC
元件分類: 微控制器/微處理器
英文描述: 32-BIT, 350 MHz, RISC PROCESSOR, PBGA255
封裝: 21 X 21 MM, PLASTIC, BGA-255
文件頁數(shù): 4/52頁
文件大?。?/td> 1276K
代理商: MPC745BPX350LE
12
MPC755 RISC Microprocessor Hardware Specifications
MOTOROLA
Electrical and Thermal Characteristics
Figure 3 provides the SYSCLK input timing diagram.
Figure 3. SYSCLK Input Timing Diagram
1.4.2.2
Processor Bus AC Specifications
Table 9 provides the processor bus AC timing specifications for the MPC755 as defined in Figure 4 and
Figure 6. Timing specifications for the L2 bus are provided in Section 1.4.2.3, “L2 Clock AC
SYSCLK jitter
±150
±150
±150
±150
ps
3, 4
Internal PLL relock
time
100
100
100
100
s3, 5
Notes:
1. Caution: The SYSCLK frequency and PLL_CFG[0:3] settings must be chosen such that the resulting SYSCLK
(bus) frequency, CPU (core) frequency, and PLL (VCO) frequency do not exceed their respective maximum or
minimum operating frequencies. Refer to the PLL_CFG[0:3] signal description in Section 1.8.1, “PLL
,” for valid PLL_CFG[0:3] settings.
2. Rise and fall times measurements are now specified in terms of slew rates, rather than time to account for
selectable I/O bus interface levels. The minimum slew rate of 1 V/ns is equivalent to a 2 ns maximum rise/fall time
measured at 0.4 V and 2.4 V (OVDD = 3.3 V) or a rise/fall time of 1 ns measured at 0.4 V and 1.8 V (OVDD =
2.5 V).
3. Timing is guaranteed by design and characterization.
4. This represents total input jitter—short term and long term combined—and is guaranteed by design.
5. Relock timing is guaranteed by design and characterization. PLL-relock time is the maximum amount of time
required for PLL lock after a stable VDD and SYSCLK are reached during the power-on reset sequence. This
specification also applies when the PLL has been disabled and subsequently re-enabled during sleep mode. Also
note that HRESET must be held asserted for a minimum of 255 bus clocks after the PLL-relock time during the
power-on reset sequence.
Table 8. Clock AC Timing Specifications (continued)
At recommended operating conditions (see Table 3)
Characteristic
Symbol
Maximum Processor Core Frequency
Unit
Notes
300 MHz
350 MHz
400 MHz
450 MHz
Min
Max
Min
Max
Min
Max
Min
Max
SYSCLK
VM
KVIH
VM = Midpoint Voltage (OVDD/2)
tSYSCLK
tKR
tKF
tKHKL
KVIL
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