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參數(shù)資料
| 型號： | MAX4357ECD |
| 廠商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分類： | 運動控制電子 |
| 英文描述： | 32 x 16 Nonblocking Video Crosspoint Switch with I/O Buffers |
| 中文描述： | 32-CHANNEL, CROSS POINT SWITCH, PQFP128 |
| 封裝： | 14 X 20 MM, 1.40 MM HEIGHT, MO-136, TQFP-128 |
| 文件頁數(shù)： | 33/42頁 |
| 文件大小： | 809K |
| 代理商： | MAX4357ECD |
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M
32 x 16 Nonblocking Video Crosspoint Switch
with I/O Buffers
______________________________________________________________________________________
33
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 Capac itive 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.
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 (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 Optimal Isolation Resistor vs.
Capacitive Load graph. A lowpass filter is created from
the series resistor and parasitic capacitance to ground.
A single R-C does not affect the performance at video
I
O
I
I
G
I
I
SCLK
DIN
EXAMPLE OF 16-BIT SERIAL CONTROL WORD FOR OUTPUT CONTROL IN INDIVIDUAL OUTPUT ADDRESS MODE
OUTPUT (i) ENABLED, A
= +1V/V,
CONNECTED TOINPUT 16
UPDATE
O
O
O
O
I
I
I
I
IC ADDRESS = 2
OUTPUT ADDRESS = 9
MODE
16-BIT INDIVIDUAL OUTPUT ADDRESS MODE:
FIRST BIT IS A DONT CARE BIT, LAST 15 BITS CLOCKED INTODIN WHEN MODE = 0, CREATES ADDRESS WORD; IC ADDRESS A3
–
A0 IS COMPARED TODIN14
–
DIN11
WHEN UPDATE IS LOW; IF EQUAL, ADDRESSED OUTPUT IS UPDATED.
t
SuMd
t
HdMd
Figure 3. Mode 0, Individual Output Address Mode Timing and Programming Example
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| MAX4357ECD+ | 功能描述:模擬和數(shù)字交叉點 IC 32x16 Nonblocking Video Crx Switch RoHS:否 制造商:Micrel 配置:2 x 2 封裝 / 箱體:MLF-16 數(shù)據(jù)速率:10.7 Gbps 輸入電平:CML, LVDS, LVPECL 輸出電平:CML 電源電壓-最大:3.6 V 電源電壓-最小:2.375 V 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 產(chǎn)品:Digital Crosspoint 封裝:Tube |
| MAX4357ECD+D | 功能描述:模擬和數(shù)字交叉點 IC 32x16 Nonblocking Video Crx Switch RoHS:否 制造商:Micrel 配置:2 x 2 封裝 / 箱體:MLF-16 數(shù)據(jù)速率:10.7 Gbps 輸入電平:CML, LVDS, LVPECL 輸出電平:CML 電源電壓-最大:3.6 V 電源電壓-最小:2.375 V 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 產(chǎn)品:Digital Crosspoint 封裝:Tube |
| MAX4357ECD+T | 功能描述:模擬和數(shù)字交叉點 IC 32x16 Nonblocking Video Crx Switch RoHS:否 制造商:Micrel 配置:2 x 2 封裝 / 箱體:MLF-16 數(shù)據(jù)速率:10.7 Gbps 輸入電平:CML, LVDS, LVPECL 輸出電平:CML 電源電壓-最大:3.6 V 電源電壓-最小:2.375 V 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 產(chǎn)品:Digital Crosspoint 封裝:Tube |
| MAX4357ECD+TD | 功能描述:模擬和數(shù)字交叉點 IC 32x16 Nonblocking Video Crx Switch RoHS:否 制造商:Micrel 配置:2 x 2 封裝 / 箱體:MLF-16 數(shù)據(jù)速率:10.7 Gbps 輸入電平:CML, LVDS, LVPECL 輸出電平:CML 電源電壓-最大:3.6 V 電源電壓-最小:2.375 V 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 產(chǎn)品:Digital Crosspoint 封裝:Tube |
| MAX4357ECD-D | 功能描述:模擬和數(shù)字交叉點 IC RoHS:否 制造商:Micrel 配置:2 x 2 封裝 / 箱體:MLF-16 數(shù)據(jù)速率:10.7 Gbps 輸入電平:CML, LVDS, LVPECL 輸出電平:CML 電源電壓-最大:3.6 V 電源電壓-最小:2.375 V 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 產(chǎn)品:Digital Crosspoint 封裝:Tube |
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