MCF5474VR266 Freescale Semiconductor, MCF5474VR266 Datasheet - Page 8

• Manufacturer Part Number: MCF5474VR266
• Description: IC MPU 32BIT COLDF 388-PBGA
• Manufacturer: Freescale Semiconductor
• Series: MCF547xr

Specifications of MCF5474VR266

• Core Processor: Coldfire V4E
• Core Size: 32-Bit
• Speed: 266MHz
• Connectivity: EBI/EMI, Ethernet, I²C, SPI, UART/USART, USB
• Peripherals: DMA, PWM, WDT
• Number Of I /o: 99
• Program Memory Type: ROMless
• Ram Size: 32K x 8
• Voltage - Supply (vcc/vdd): 1.43 V ~ 1.58 V
• Oscillator Type: External
• Operating Temperature: 0°C ~ 70°C
• Package / Case: 388-BGA
• Family Name: MCF5xxx
• Device Core: ColdFire V4e
• Device Core Size: 32b
• Frequency (max): 266MHz
• Instruction Set Architecture: RISC
• Supply Voltage 1 (typ): 1.5/3.3V
• Operating Supply Voltage (max): 1.58/3.6V
• Operating Supply Voltage (min): 1.43/3V
• Operating Temp Range: 0C to 70C
• Operating Temperature Classification: Commercial
• Mounting: Surface Mount
• Pin Count: 388
• Package Type: BGA
• Processor Series: MCF547x
• Core: ColdFire V4
• Data Bus Width: 32 bit
• Program Memory Size: 32 KB
• Data Ram Size: 32 KB
• Interface Type: I2C, JTAG
• Maximum Clock Frequency: 83 MHz
• Operating Supply Voltage: 3 V to 3.6 V
• Maximum Operating Temperature: + 70 C
• Mounting Style: SMD/SMT
• 3rd Party Development Tools: JLINK-CF-BDM26, EWCF
• Development Tools By Supplier: M5475EVBE
• Minimum Operating Temperature: 0 C
• Cpu Speed: 266MHz
• Embedded Interface Type: I2C, UART, DMA
• Digital Ic Case Style: BGA
• No. Of Pins: 388
• Rohs Compliant: Yes
• For Use With: M5475EVBGHS - KIT DEV GHS FOR M5475EVBM5474GFE - MODULE M5474 FIRE ENGINEM5474LITEKIT - KIT DEV FOR MCF547X
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Program Memory Size: -
• Data Converters: -
• Lead Free Status / Rohs Status: Compliant

Hardware Design Considerations
4.3
4.3.1
4.3.2
Connecting the USBVBUS pin directly to the 5V VBUS signal from the USB connector can cause long-term reliability
problems in the ESD network of the processor. Therefore, use of an external voltage divider for VBUS is recommended.
Figure 4
should connect. Point B, marked in each figure, is where a 3.3V version of VBUS should connect to the USBVBUS pin on the
device.
4.3.3
It is recommended to connect the shield and the ground pin of the B USB receptacle for upstream ports to the board ground
plane. The ground pin of the A USB receptacles for downstream ports should also be connected to the board ground plane, but
industry practice varies widely on the connection of the shield of the A USB receptacles to other system grounds. Take
precautions for control of ground loops between hosts and self-powered USB devices through the cable shield.
8
1.
2.
3.
4.
5.
6.
7.
8.
9.
High speed clock and the USBD+ and USBD- differential pair should be routed first.
Route USBD+ and USBD- signals on the top layer of the board.
The trace width and spacing of the USBD+ and USBD- signals should be such that the differential impedance is 90Ω.
Route traces over continuous planes (power and ground)—they should not pass over any power/ground plane slots or
anti-etch. When placing connectors, make sure the ground plane clear-outs around each pin have ground continuity
between all pins.
Maintain the parallelism (skew matched) between USBD+ and USBD-. These traces should be the same overall length.
Do not route USBD+ and USBD- traces under oscillators or parallel to clock traces and/or data buses. Minimize the
lengths of high speed signals that run parallel to the USBD+ and USBD- pair. Maintain a minimum 50mil spacing to
clock signals.
Keep USBD+ and USBD- traces as short as possible.
Route USBD+, USBD-, and USBVBUS signals with a minimum amount of vias and corners. Use 45° turns.
Stubs should be avoided as much as possible. If they cannot be avoided, stubs should be no greater than 200mils.
and
General USB Layout Guidelines
Figure 5
USB D+ and D- High-Speed Traces
USB VBUS Traces
USB Receptacle Connections
depict possible connections for VBUS. Point A, marked in each figure, is where a 5V version of VBUS
(5V)
(5V)
MCF547x ColdFire
Figure 4. Preferred VBUS Connections
Figure 5. Alternate VBUS Connections
A
A
8.2k
50k
20k
(3.3V)
(3.3V)
B
B
®
Microprocessor, Rev. 4
50k
50k
MCF547x
MCF547x
50k
50k
Freescale Semiconductor