參數(shù)資料
型號(hào)： MPC850EC
廠商： Motorola, Inc.
英文描述： Communications Controller Hardware Specifications
中文描述： 通信控制器的硬件規(guī)格
文件頁(yè)數(shù)： 10/68頁(yè)
文件大?。?/td> 384K
代理商： MPC850EC
10
MPC850 (Rev. A/B/C) Hardware Specifications
MOTOROLA
Layout Practices
For most applications P
I/O
< 0.3
P
INT
and can be neglected. If P
I/O
is neglected
,
an approximate relationship
between P
D
and T
J
is:
P
D
= K
÷
(T
J
+ 273
°
C)
Solving equations (1) and (2) for K gives:
K = P
D
(T
A
+ 273
°
C) +
θ
JA
P
D
(3)
where K is a constant pertaining to the particular part. K can be determined from equation (3) by measuring
P
(at equilibrium) for a known T
. Using this value of K
,
the values of P
D
and T
J
can be obtained by solving
equations (1) and (2) iteratively for any value of T
A
.
(2)
2
5.1
Layout Practices
Each V
CC
pin on the MPC850 should be provided with a low-impedance path to the board’s supply. Each
GND pin should likewise be provided with a low-impedance path to ground. The power supply pins drive
distinct groups of logic on chip. The V
CC
power supply should be bypassed to ground using at least four 0.1
μF by-pass capacitors located as close as possible to the four sides of the package. The capacitor leads and
associated printed circuit traces connecting to chip V
CC
and GND should be kept to less than half an inch
per capacitor lead. A four-layer board is recommended, employing two inner layers as V
CC
and GND planes.
All output pins on the MPC850 have fast rise and fall times. Printed circuit (PC) trace interconnection length
should be minimized in order to minimize undershoot and reflections caused by these fast output switching
times. This recommendation particularly applies to the address and data busses. Maximum PC trace lengths
of six inches are recommended. Capacitance calculations should consider all device loads as well as
parasitic capacitances due to the PC traces. Attention to proper PCB layout and bypassing becomes
especially critical in systems with higher capacitive loads because these loads create higher transient
currents in the V
CC
and GND circuits. Pull up all unused inputs or signals that will be inputs during reset.
Special care should be taken to minimize the noise levels on the PLL supply pins.
Part VI Bus Signal Timing
Table 6 provides the bus operation timing for the MPC850 at 50 MHz, 66 MHz, and 80 MHz. Timing
information for other bus speeds can be interpolated by equation using the MPC850 Electrical
Specifications Spreadsheet found at http://www.mot.com/netcomm.
The maximum bus speed supported by the MPC850 is 50 MHz. Higher-speed parts must be operated in
half-speed bus mode (for example, an MPC850 used at 66 MHz must be configured for a 33 MHz bus).
The timing for the MPC850 bus shown assumes a 50-pF load. This timing can be derated by 1 ns per 10 pF.
Derating calculations can also be performed using the MPC850 Electrical Specifications Spreadsheet.
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
MPC850SRCVR50BU 功能描述:微處理器 - MPU POWER QUICC RoHS:否 制造商:Atmel 處理器系列:SAMA5D31 核心:ARM Cortex A5 數(shù)據(jù)總線寬度:32 bit 最大時(shí)鐘頻率:536 MHz 程序存儲(chǔ)器大小:32 KB 數(shù)據(jù) RAM 大小:128 KB 接口類(lèi)型:CAN, Ethernet, LIN, SPI,TWI, UART, USB 工作電源電壓:1.8 V to 3.3 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:FBGA-324
MPC850SRCVR66BU 功能描述:微處理器 - MPU POWER QUICC RoHS:否 制造商:Atmel 處理器系列:SAMA5D31 核心:ARM Cortex A5 數(shù)據(jù)總線寬度:32 bit 最大時(shí)鐘頻率:536 MHz 程序存儲(chǔ)器大小:32 KB 數(shù)據(jù) RAM 大小:128 KB 接口類(lèi)型:CAN, Ethernet, LIN, SPI,TWI, UART, USB 工作電源電壓:1.8 V to 3.3 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:FBGA-324
MPC850SRCZQ50BU 功能描述:微處理器 - MPU POWERPC MPU W/CPM RoHS:否 制造商:Atmel 處理器系列:SAMA5D31 核心:ARM Cortex A5 數(shù)據(jù)總線寬度:32 bit 最大時(shí)鐘頻率:536 MHz 程序存儲(chǔ)器大小:32 KB 數(shù)據(jù) RAM 大小:128 KB 接口類(lèi)型:CAN, Ethernet, LIN, SPI,TWI, UART, USB 工作電源電壓:1.8 V to 3.3 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:FBGA-324
MPC850SRCZQ66BU 功能描述:微處理器 - MPU POWERPC MPU W/CPM RoHS:否 制造商:Atmel 處理器系列:SAMA5D31 核心:ARM Cortex A5 數(shù)據(jù)總線寬度:32 bit 最大時(shí)鐘頻率:536 MHz 程序存儲(chǔ)器大小:32 KB 數(shù)據(jù) RAM 大小:128 KB 接口類(lèi)型:CAN, Ethernet, LIN, SPI,TWI, UART, USB 工作電源電壓:1.8 V to 3.3 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:FBGA-324
MPC850SRVR50BU 功能描述:微處理器 - MPU POWER QUICC RoHS:否 制造商:Atmel 處理器系列:SAMA5D31 核心:ARM Cortex A5 數(shù)據(jù)總線寬度:32 bit 最大時(shí)鐘頻率:536 MHz 程序存儲(chǔ)器大小:32 KB 數(shù)據(jù) RAM 大小:128 KB 接口類(lèi)型:CAN, Ethernet, LIN, SPI,TWI, UART, USB 工作電源電壓:1.8 V to 3.3 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:FBGA-324
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