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参数资料
型号： MPC8245LZU350X
厂商： MOTOROLA INC
元件分类： 微控制器/微处理器
英文描述： 32-BIT, 350 MHz, RISC PROCESSOR, PBGA352
封装： 35 X 35 MM, 1.65 MM HEIGHT, 1.27 MM PITCH, CAVITY DOWN, TBGA-352
文件页数： 17/60页
文件大小： 620K
代理商： MPC8245LZU350X
24
MPC8245 Integrated Processor Hardware Specications
PRELIMINARY—SUBJECT TO CHANGE WITHOUT NOTICE
Electrical and Thermal Characteristics
1.4.3.4 I2C AC Timing Specications
Table 11 provides the I2C input AC timing specications for the MPC8245.
Notes:
1
Units for these specications are in SDRAM_CLK units.
2
The actual values depend on the setting of the Digital Filter Frequency Sampling Rate (DFFSR) bits in
the Frequency Divider Register I2CFDR. Therefore, the noted timings in the above table are all relative to
qualied signals. The qualied SCL and SDA are delayed signals from what is seen in real time on the
I2C bus. The qualied SCL, SDA signals are delayed by the SDRAM_CLK clock times DFFSR times 2
plus 1 SDRAM_CLK clock. The resulting delay value is added to the value in the table (where this note is
referenced). See Figure 15.
3
Timing is relative to the Sampling Clock (not SCL).
4
FDR[x] refers to the Frequency Divider Register I2CFDR bit x.
5
Input clock low and high periods in combination with the FDR value in the Frequency Divider Register
(I2CFDR) determine the maximum I2C input frequency. See Table 12.
Table 11. I2C Input AC Timing Specifications
At recommended operating conditions (see Table 2) with LVdd = 3.3 V ± 0.3V
Num
Characteristic
Min
Max
Unit
Notes
1
Start condition hold time
4.0
—
CLKs
1,2
2
Clock low period
(The time before the MPC8245 will drive
SCL low as a transmitting slave after
detecting SCL low as driven by an external
master.)
8.0 + (16 x 2FDR[4–2]) x (5 -
4({FDR[5],FDR[1]} == b’10) -
3({FDR[5],FDR[1]} == b’11) -
2({FDR[5],FDR[1]} == b’00) -
1({FDR[5],FDR[1]} == b’01))
—
CLKs
1,2,4, 5
3
SCL/SDA rise time (from 0.5V to 2.4V)
—
1
ms
4
Data hold time
0
—
ns
2
5
SCL/SDA fall time (from 2.4V to 0.5V)
—
1
ms
6
Clock high period
(Time needed to either receive a data bit
or generate a START or STOP)
5.0
—
CLKs
1,2, 5
7
Data setup time
3.0
—
ns
3
8
Start condition setup time (for repeated
start condition only)
4.0
—
CLKs
1,2
9
Stop condition setup time
4.0
—
CLKs
1,2
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