參數(shù)資料
型號(hào)： MC7447AVU867NB
廠商： FREESCALE SEMICONDUCTOR INC
元件分類(lèi)： 微控制器/微處理器
英文描述： 32-BIT, 867 MHz, RISC PROCESSOR, CBGA360
封裝： 25 X 25 MM, 2.80 MM HEIGHT, 1.27 MM PITCH, ROHS COMPLIANT, CERAMIC, BGA-360
文件頁(yè)數(shù)： 33/58頁(yè)
文件大?。?/td> 1095K
代理商： MC7447AVU867NB
MPC7447A RISC Microprocessor Hardware Specifications, Rev. 5
Freescale Semiconductor
39
System Design Information
Figure 18. Driver Impedance Measurement
Table 15 summarizes the signal impedance results. The impedance increases with junction temperature
and is relatively unaffected by bus voltage.
9.6
Pull-Up/Pull-Down Resistor Requirements
The MPC7447A requires high-resistive (weak: 4.7 K
Ω) pull-up resistors on several control pins of the bus
interface to maintain the control signals in the negated state after they have been actively negated and
released by the MPC7447A or other bus masters. These pins are: TS, ARTRY, SHDO, and SHD1.
Some pins designated as being factory test pins must be pulled up to OVDD or down to GND to ensure
proper device operation. The pins that must be pulled up to OVDD are: LSSD_MODE and TEST[0:3]; the
pins that must be pulled down to GND are: L1_TSTCLK and TEST[4]. The CKSTP_IN signal should
likewise be pulled up through a pull-up resistor (weak or stronger: 4.7 K
Ω–1 KΩ) to prevent erroneous
assertions of this signal.
In addition, the MPC7447A has one open-drain style output that requires a pull-up resistor (weak or
stronger: 4.7 K
Ω–1 KΩ) if it is used by the system. This pin is CKSTP_OUT.
If pull-down resistors are used to configure BVSEL, the resistors should be less than 250
Ω (see Table 12).
Because PLL_CFG[0:4] must remain stable during normal operation, strong pull-up and pull-down
resistors (1 K
Ω or less) are recommended to configure these signals in order to protect against erroneous
switching due to ground bounce, power supply noise or noise coupling.
Table 15. Impedance Characteristics
VDD = 1.5 V, OVDD = 1.8 V ± 5%, Tj = 5°–85°C
Impedance
Processor Bus
Unit
Z0
Typical
33–42
Ω
Maximum
31–51
Ω
OVDD
OGND
RP
RN
Pad
Data
SW1
SW2
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