MAX4357ECD MAXIM [Maxim Integrated Products], MAX4357ECD Datasheet - Page 31

• Manufacturer Part Number: MAX4357ECD
• Description: 32 x 16 Nonblocking Video Crosspoint Switch with I/O Buffers
• Manufacturer: MAXIM [Maxim Integrated Products]

while still being able to immediately address and
update individual outputs in the matrix.
Drive MODE to logic low to select Mode 0. Individual
outputs are programmed through the serial interface
with a single 16-bit control word. The control word con-
sists of a don’t care MSB, the chip address bits, output
address bits, an output enable/disable bit, an output
gain-set bit, and input address bits (Table 2 through
Table 6, and Figure 2).
In Mode 0, data at DIN passes directly to DOUT
through the data routing gate (Figure 3). In this configu-
ration, the 16-bit control word is simultaneously sent to
all chips in an array of up to 16 addresses.
Drive MODE to logic high to select Mode 1. A single
112-bit control word, consisting of sixteen 7-bit control
words, programs all outputs. The 112-bit control word’s
Figure 2. Serial Interface Block Diagram
Individual Output Address Mode (MODE = 0)
32 x 16 Nonblocking Video Crosspoint Switch
Complete Matrix Mode (MODE = 1)
______________________________________________________________________________________
DIN
MODE
SCLK
CE
MODE
SCLK
CE
OUTPUT ADDRESS DECODE
EN
UPDATE
SWITCH MATRIX
16-BIT INDIVIDUAL OUTPUT
112-BIT COMPLETE MATRIX MODE REGISTER
ADDRESS MODE REGISTER
CHIP ADDRESS
512
11
11
112-BIT PARALLEL LATCH
A0–A3
SWITCH DECODE
7
4
4
112
7
first 7-bit control word (MSBs) programs output 15, and
the last 7-bit control word (LSBs) programs output 0
(Table 7 and Figures 4 and 5). Data clocked into the
112-bit Complete Matrix Mode register is latched on the
falling edge of UPDATE, and the outputs are immedi-
ately updated.
Complete Matrix Mode (Mode = 1) is convenient for
programming the matrix at power-up. In a large matrix
consisting of many MAX4357s, all the devices can be
programmed by sending a single bit stream equal to n
x 112 bits where n is the number of MAX4357 devices
on the bus. The first 112-bit data word programs the
last MAX4357 in line (see Matrix Programming section).
The MAX4357 features an asynchronous bidirectional
RESET with an internal 20k
When RESET is pulled low either by internal circuitry, or
MODE
OUTPUT ENABLE
16
1
112
AOUT
112
MODE
with I/O Buffers
B
A
ROUTING
DATA
GATE
S
MODE
DOUT
pullup resistor to V
Initialization String
RESET
DD
31
.