参数资料
型号: MCF5474VR266
厂商: FREESCALE SEMICONDUCTOR INC
元件分类: 微控制器/微处理器
英文描述: 32-BIT, 266.66 MHz, RISC PROCESSOR, PBGA388
封装: 27 X 27 MM, MS-034AAL-1, PBGA-388
文件页数: 2/34页
文件大小: 600K
代理商: MCF5474VR266
MCF547x ColdFire Microprocessor, Rev. 4
Output Driver Capability and Loading
Freescale Semiconductor
10
4.4.1
Bias Resistor
The USBRBIAS resistor should be placed as close to the dedicated USB 2.0 pins as possible. The tolerance should be ±1%.
Figure 7. USBRBIAS Connection
5
Output Driver Capability and Loading
Table 6 lists values for drive capability and output loading.
Table 6. I/O Driver Capability1
1 The device’s pads have balanced sink and source current. The drive capability is the same as
the sink capability.
Signal
Drive
Capability
Output
Load (CL)
SDRAMC (SDADDR[12:0], SDDATA[31:0], RAS, CAS, SDDM[3:0],
SDWE, SDBA[1:0]
24 mA
15 pF
SDRAMC DQS and clocks (SDDQS[3:0], SDRDQS, SDCLK[1:0],
SDCLK[1:0], SDCKE)
24 mA
15 pF
SDRAMC chip selects (SDCS[3:0])
24 mA
15 pF
FlexBus (AD[31:0], FBCS[5:0], ALE, R/W, BE/BWE[3:0], OE)
16 mA
30 pF
FEC (EnMDIO, EnMDC, EnTXEN, EnTXD[3:0], EnTXER
8 mA
15 pF
Timer (TOUT[3:0])
8 mA
50 pF
DACK[1:0]
8 mA
30 pF
PSC (PSCnTXD[3:0], PSCnRTS/PSCnFSYNC,
8 mA
30 pF
DSPI (DSPISOUT, DSPICS0/SS, DSPICS[2:3], DSPICS5/PCSS)
24 mA
50 pF
PCI (PCIAD[31:0], PCIBG[4:1], PCIBG0/PCIREQOUT, PCIDEVSEL,
PCICXBE[3:0], PCIFRM, PCIPERR, PCIRESET, PCISERR, PCISTOP,
PCIPAR, PCITRDY, PCIIRDY
16 mA
50 pF
I2C (SCL, SDA)
8 mA
50 pF
BDM (PSTCLK, PSTDDATA[7:0], DSO/TDO,
8 mA
25 pF
RSTO
8 mA
50 pF
9.1k
Ω
USBRBIAS
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