參數(shù)資料
型號(hào)： MCF5470
廠商： 飛思卡爾半導(dǎo)體(中國(guó))有限公司
英文描述： MCF547x Integrated Microprocessor Electrical Characteristics
中文描述： MCF547x集成的微處理器，電氣特性
文件頁(yè)數(shù)： 6/28頁(yè)
文件大?。?/td> 706K
代理商： MCF5470
MCF547x Integrated Microprocessor Electrical Characteristics, Rev. 2
Output Driver Capability and Loading
Freescale Semiconductor
6
The recommended power up sequence is as follows:
1. Use 1 microsecond or slower rise time for all supplies.
2. IV
DD
/PLL V
DD
and EV
DD
/SD V
DD
should track up to 0.9V, then separate for the completion of
ramps with EV
DD
/SD V
DD
going to the higher external voltages. One way to accomplish this is to
use a low drop-out voltage regulator.
4.2
Power Down Sequence
If IV
DD
PLL V
DD
are powered down first, then sense circuits in the I/O pads will cause all output drivers
to be in a high impedance state. There is no limit on how long after IV
DD
and PLL V
DD
power down before
EV
DD
or SD V
DD
must power down. IV
DD
should not lag EV
DD
, SD V
DD
, or PLL V
DD
going low by
more than 0.4V during power down or there will be undesired high current in the ESD protection diodes.
There are no requirements for the fall times of the power supplies.
The recommended power down sequence is as follows:
1. Drop IV
DD
/PLL V
DD
to 0V
2. Drop EV
DD
/SD V
DD
supplies
5
Output Driver Capability and Loading
Table 6
lists values for drive capability and output loading.
Table 6. I/O Driver Capability
Signal
Drive
Capability
Output
Load (C
L
)
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
20 pF
FEC (E
n
MDIO, E
n
MDC, E
n
TXEN, E
n
TXD[3:0], E
n
TXER
8 mA
15 pF
Timer (TOUT[3:0])
8 mA
50 pF
DACK[1:0]
8 mA
30 pF
PSC (PSC
n
TXD[3:0], PSC
n
RTS/PSC
n
FSYNC,
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
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