參數(shù)資料
型號: MCIMX257CJN4A
廠商: FREESCALE SEMICONDUCTOR INC
元件分類: 微控制器/微處理器
英文描述: 32-BIT, 400 MHz, MICROPROCESSOR, PBGA347
封裝: 12 X 12 MM, 0.50 MM PITCH, ROHS COMPLIANT, PLASTIC, MAPBGA-347
文件頁數(shù): 86/154頁
文件大?。?/td> 1498K
代理商: MCIMX257CJN4A
i.MX25 Applications Processor for Consumer and Industrial Products, Rev. 8
Freescale Semiconductor
37
3.6.3.2
DDR_TYPE = 01 SDRAM I/O AC Parameters and Requirements
Table 27 shows AC parameters for SDRAM I/O.
Table 27. AC Parameters for SDRAM I/O
Parameter
Symbol
Load
Condition
Min.
Rise/Fall
Typ.
Max.
Rise/Fall
Units
Notes
Duty cycle
Fduty
40
50
60
%
Clock frequency
f
133
MHz
1
Output pad transition times (max. drive)
tpr
25 pF
50 pF
0.82/0.87
1.56/1.67
1.14/1.13
2.13/2.09
1.62/1.50
3.015/2.7
7
ns
1
Output pad transition times (high drive)
tpr
25 pF
50 pF
1.23/1.31
2.31/2.47
1.71/1.68
3.22/3.12
2.39/2.22
4.53/4.16
ns
Output pad transition times (standard drive)
tpr
25 pF
50 pF
2.44/2.60
4.65/4.99
3.38/3.27
6.38/6.23
4.73/4.38
9.05/8.23
ns
Output pad propagation delay (max. drive),
50%–50%
tpo
15 pF
35 pF
0.97/1.19
2.85/3.21
1.69/0.75
2.02/2.30
2.17/2.46
2.93/3.27
ns
1
Output pad propagation delay (high drive),
50%–50%
tpo
15 pF
35 pF
1.15/1.39
3.57/3.91
1.72/1.93
2.54/2.85
2.51/2.77
3.66/3.97
ns
Output pad propagation delay (standard
drive), 50%–50%
tpo
15 pF
35 pF
2.01/1.57
5.73/6.05
2.45/2.69
4.10/4.51
3.54/3.77
5.84/6.13
ns
Output pad propagation delay (max. drive),
40%–60%
tpo
15 pF
35 pF
1.06/1.26
1.38/1.38
1.53/1.73
1.96/2.23
2.18/2.47
2.78/3.12
ns
1
Output pad propagation delay (high drive),
40%–60%
tpo
15 pF
35 pF
1.15/1.20
1.75/1.67
1.72/1.93
2.37/2.66
2.45/2.71
3.35/3.67
ns
Output pad propagation delay (standard
drive), 40%–60%
tpo
15 pF
35 pF
1.91/2.01
2.88/2.56
2.30/2.52
3.59/3.97
3.26/3.50
5.06/5.36
ns
Output enable to output valid delay (max.
drive), 50%–50%
tpv
15 pF
35 pF
0.90/1.27
1.07/1.77
1.44/1.89
1.66/2.51
2.19/2.87
2.51/3.69
ns
1
Output enable to output valid delay (high
drive), 50%–50%
tpv
15 pF
35 pF
1.01/1.48
1.37/2.33
1.58/2.16
2.06/3.09
2.38/3.23
3.06/4.46
ns
Output enable to output valid delay (standard
drive), 50%–50%
tpv
15 pF
35 pF
1.32/2.14
2.04/3.67
2.02/3.00
3.00/4.91
3.01/4.36
4.40/6.90
ns
Output enable to output valid delay (max.
drive), 40%–60%
tpv
15 pF
35 pF
1.03/1.34
1.16/1.74
1.54/1.94
1.74/2.44
2.26/2.88
2.55/3.54
ns
Output enable to output valid delay (high
drive), 40%–60%
tpv
15 pF
35 pF
1.11/1.51
1.39/2.10
1.65/2.15
2.03/2.89
2.43/3.16
2.95/4.13
ns
Output enable to output valid delay (standard
drive), 40%–60%
tpv
15 pF
35 pF
1.35/2.03
1.91/3.23
1.99/2.83
2.76/4.30
2.89/4.03
3.98/6.01
ns
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