參數(shù)資料
型號： MAX4358ECE+TD
廠商： Maxim Integrated Products
文件頁數(shù)： 30/43頁
文件大?。?/td> 0K
描述： IC VIDEO CROSSPOINT SWIT 144TQFP
產(chǎn)品變化通告： Product Discontinuation 28/Nov/2011
標(biāo)準(zhǔn)包裝： 250
功能： 視頻交叉點(diǎn)開關(guān)
電路： 1 x 32:16
電壓電源： 單/雙電源
電壓 - 電源，單路/雙路(±)： 5V，± 3 V ~ 5 V
工作溫度： -40°C ~ 85°C
安裝類型： 表面貼裝
封裝/外殼： 144-TQFP
供應(yīng)商設(shè)備封裝： 144-TQFP（20x20）
包裝： 帶卷 (TR)
MAX4358
32 x 16 Nonblocking Video Crosspoint Switch
with On-Screen Display Insertion and I/O Buffers
36
______________________________________________________________________________________
The most straightforward technique for implementing
nonblocking matrices is to arrange the building blocks
in a grid. The inputs connect to each vertical bank of
devices in parallel with the other banks. The outputs of
each building block in a vertical column connect
together in a wired-OR configuration. Figure 6.shows a
128-input, 32-output, nonblocking array using eight
MAX4358 crosspoint devices.
The wire-OR connection of the outputs shown in the
diagram is possible because the outputs of the IC
devices can be placed in a disabled, or high-imped-
ance-output state. This disable state of the output
buffers is designed for a maximum impedance vs. fre-
quency while maintaining a low output capacitance.
These characteristics minimize the adverse loading
effects from the disabled outputs. Larger arrays are
constructed by extending this connection technique to
more devices.
Driving a Capacitive Load
Figure 6 shows an implementation requiring many out-
puts to be wired together. This creates a situation
where each output buffer sees not only the normal load
impedance, but also the disabled impedance of all the
other outputs. This impedance has a resistive and a
capacitive component. The resistive components
reduce the total effective load for the driving output.
Table 5. Output Selection Programming
OUTPUT ADDRESS BIT
B3 (MSB)
B2
B1
B0 (LSB)
SELECTED OUTPUT
0
000
0
001
1
0
010
2
0
011
3
0
100
4
0
101
5
0
110
6
0
111
7
1
000
8
1
001
9
1
010
10
1
011
11
1
100
12
1
101
13
1
110
14
1
111
15
INPUTS
(0–31)
OUTPUTS (16–31)
32
IN
16
OUT
32
IN
16
OUT
32
IN
16
OUT
32
IN
16
OUT
MAX4358
INPUTS
(32–63)
INPUTS
(64–95)
INPUTS
(96–127)
32
IN
16
OUT
32
IN
16
OUT
32
IN
16
OUT
32
IN
16
OUT
MAX4358
OUTPUTS (0–15)
Figure 6. 128 x 32 Nonblocking Matrix Using 32 x 16
Crosspoint Devices
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