参数资料
型号: MAX4358ECE+TD
厂商: Maxim Integrated Products
文件页数: 31/43页
文件大小: 0K
描述: IC VIDEO CROSSPOINT SWIT 144TQFP
产品变化通告: Product Discontinuation 28/Nov/2011
标准包装: 250
功能: 视频交叉点开关
电路: 1 x 32:16
电压电源: 单/双电源
电压 - 电源,单路/双路(±): 5V,± 3 V ~ 5 V
工作温度: -40°C ~ 85°C
安装类型: 表面贴装
封装/外壳: 144-TQFP
供应商设备封装: 144-TQFP(20x20)
包装: 带卷 (TR)
MAX4358
32 x 16 Nonblocking Video Crosspoint Switch
with On-Screen Display Insertion and I/O Buffers
______________________________________________________________________________________
37
Total capacitance is the sum of the capacitance of all
the disabled outputs and is a function of the size of the
matrix. Also, as the size of the matrix increases, the
length of the PC board traces increases, adding more
capacitance. The output buffers have been designed to
drive more than 30pF of capacitance while still main-
taining a good AC response. Depending on the size of
the array, the capacitance seen by the output can
exceed this amount. There are several ways to improve
the situation. The first is to use more building-block
crosspoint devices to reduce the number of outputs
that need to be wired together (see Figure 7).
In Figure 7, the additional devices are placed in a sec-
ond bank to multiplex the signals. This reduces the
number of wired-OR connections. Another solution is to
put a small resistor in series with the output before the
capacitive load to limit excessive ringing and oscilla-
tions. Figure 8 shows the graph of the Optimal Isolation
Table 6. Input Selection Programming
INPUT ADDRESS BIT
B4
(MSB)
B3
B2
B1
B0
(LSB)
SELECTED
INPUT
00
0
00
0
1
00
0
1
0
2
00
0
1
3
00
1
0
4
00
1
0
1
5
00
1
0
6
00
1
7
01
0
8
01
0
1
9
01
0
1
0
10
01
0
1
11
01
1
0
12
01
1
0
1
13
01
1
0
14
01
1
15
10
0
16
10
0
1
17
10
0
1
0
18
10
0
1
19
10
1
0
20
10
1
0
1
21
10
1
0
22
10
1
23
11
0
24
11
0
1
25
11
0
1
0
26
11
0
1
27
11
1
0
28
11
1
0
1
29
11
1
0
30
11
1
31
INPUTS (0–31)
INPUTS (32–63))
INPUTS (64–95)
INPUTS (96–127)
OUTPUTS (0–15)
32
IN
16
OUT
32
IN
16
OUT
32
IN
16
OUT
32
IN
16
OUT
16
IN
16
IN
16
OUT
MAX4358
Figure 7. 128 x 16 Nonblocking Matrix with Reduced Capacitive
Loading
0
10
5
20
15
25
30
0
500
OPTIMAL ISOLATION RESISTANCE
vs. CAPACITIVE LOAD
CAPACITIVE LOAD (pF)
ISOLATION
RESISTANCE
(
)
200
100
300
400
Figure 8. Optimal Isolation Resistor vs. Capacitive Load
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