MAX4358ECE MAXIM [Maxim Integrated Products], MAX4358ECE Datasheet - Page 33

• Manufacturer Part Number: MAX4358ECE
• Description: 32 x 16 Nonblocking Video Crosspoint Switch with On-Screen Display Insertion and I/O Buffers
• Manufacturer: MAXIM [Maxim Integrated Products]

Figure 3. Mode 0, Individual Output Address Mode Timing and Programming Example
with On-Screen Display Insertion and I/O Buffers
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.
The power-on-reset ensures all output buffers are in a
disabled state when power is initially applied. A V
voltage comparator generates the power-on-reset.
When the voltage at V
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-
UPDATE
MODE
SCLK
DIN
32 x 16 Nonblocking Video Crosspoint Switch
t SuMd
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
______________________________________________________________________________________
IC ADDRESS = 2
DD
is less than 2.5V, the power-
EXAMPLE OF 16-BIT SERIAL CONTROL WORD FOR OUTPUT CONTROL IN INDIVIDUAL OUTPUT ADDRESS MODE
Power-On-Reset
OUTPUT ADDRESS = 9
DD
Reset vs. RESET Capacitance graph in Typical
Operating Characteristics).
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.
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.
Building Large Video-Switching Systems
OUTPUT (i) ENABLED, A
Applications Information
CONNECTED TO INPUT 16
V
= +1V/V,
Thermal Shutdown
t
HdMd
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