参数资料
型号: MAX4358ECE+TD
厂商: Maxim Integrated Products
文件页数: 27/43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
______________________________________________________________________________________
33
Since driving
RESET low only clears the output-buffer-
enable bit in the matrix control latches,
RESET can be
used to disable all outputs simultaneously. If no new
data has been loaded into the 112-bit complete matrix
mode register, a single
UPDATE restores the previous
matrix control settings.
Power-On-Reset
The power-on-reset ensures all output buffers are in a
disabled state when power is initially applied. A VDD
voltage comparator generates the power-on-reset.
When the voltage at VDD is less than 2.5V, the power-
on-reset comparator pulls
RESET low via internal cir-
cuitry. As the digital-supply voltage ramps up crossing
2.5V, the MAX4358 holds
RESET low for 40ns (typ).
Connecting a small capacitor from
RESET to DGND
extends the power-on-reset delay. (see the Power-On-
Reset vs.
RESET Capacitance graph in Typical
Operating Characteristics).
Thermal Shutdown
The MAX4358 features thermal shutdown protection
with temperature hysteresis. When the die temperature
exceeds 150°C, the MAX4358 pulls
RESET low, dis-
abling the output buffer. When the die cools by 20°C,
the
RESET pulldown is deasserted, and output buffers
remain disabled until the device is programmed again.
Applications Information
Building Large Video-Switching Systems
The MAX4358 can be easily used to create larger
switching matrices. The number of ICs required to
implement the matrix is a function of the number of
input channels, the number of outputs required, and
whether the array needs to be nonblocking or not.
INPUT
ADDRESS
0
(LSB)
=
0
OUTPUT
ENABLE
INPUT
ADDRESS
1
=
0
INPUT
ADDRESS
4
(MSB)
=
1
GAIN
SET
=
+1V/V
INPUT
ADDRESS
2
=
0
INPUT
ADDRESS
3
=
0
SCLK
DIN
EXAMPLE OF 16-BIT SERIAL CONTROL WORD FOR OUTPUT CONTROL IN INDIVIDUAL OUTPUT ADDRESS MODE
OUTPUT (i) ENABLED, AV = +1V/V,
CONNECTED TO INPUT 16
UPDATE
OUTPUT
ADDRESS
B0
OUTPUT
ADDRESS
B1
OUTPUT
ADDRESS
B2
OUTPUT
ADDRESS
B3
IC
ADDRESS
A0
IC
ADDRESS
A1
IC
ADDRESS
A2
IC
ADDRESS
A3
IC ADDRESS = 2
OUTPUT ADDRESS = 9
MODE
16-BIT INDIVIDUAL OUTPUT ADDRESS MODE:
FIRST BIT IS A DON'T CARE BIT, LAST 15 BITS CLOCKED INTO DIN WHEN MODE = 0, CREATES ADDRESS WORD; IC ADDRESS A3–A0 IS COMPARED TO DIN14–DIN11
WHEN UPDATE IS LOW; IF EQUAL, ADDRESSED OUTPUT IS UPDATED
DON'T
CARE
X
tSuMd
tHdMd
Figure 3. Mode 0, Individual Output Address Mode Timing and Programming Example
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