MAX4359 查看數據表（PDF） - Maxim Integrated

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MAX4359

Low-Cost 4x4, 8x4, 8x8 Video Crosspoint Switches

Maxim Integrated 

Low-Cost 4x4, 8x4, 8x8

Video Crosspoint Switches

Detailed Description

Output Buffers

The MAX4456 video crosspoint switch consists of 64

T-switches in an 8x8 grid (Figure 1). The eight matrix

outputs are followed by eight wideband buffers opti-

mized for driving 400Ω and 20pF loads. The

MAX4359’s core is a 4x4 switch matrix with each of its

outputs followed by a wideband buffer. The MAX4360

has an 8x4 matrix and four output buffers. Each buffer

has an internal active load on the output that can be

readily shut off through the LOAD input (off when LOAD

= 0V). The shut-off is useful when two or more cross-

points are connected in parallel to create more input

channels. With more input channels, only one set of

buffers can be active and only one set of loads can be

driven. When active, the buffer must have either 1) an

internal load, 2) the internal load of another buffer in

another MAX4359/MAX4360/MAX4456, or 3) an exter-

nal load.

Each output can be disabled under logic control. When

a buffer is disabled, its output enters a high-impedance

state. In multichip parallel applications, the disable

function prevents inactive outputs from loading lines

driven by other devices. Disabling the inactive buffers

reduces power consumption.

The outputs connect easily to MAX497 quad, gain-of-

two buffers when back-terminated 75Ω coaxial cable

must be driven.

IN0 IN1 IN2 IN3 IN4 IN5 IN6 IN7

OUTPUT

BUFFERS

A = +1

OUT0

MAX4456

8x8

SWITCH

MATRIX

400Ω

LOAD

A = +1

OUT7

2nd-RANK REGISTERS

LATCH

EDGE/LEVEL

400Ω

SER/PAR

1st-RANK REGISTERS

A0 A1 A2

D2 D3

D0/SER IN D1/SER OUT

Figure 1. MAX4456 Functional Diagram

WR

CE

CE

V+ V- AGND DGND

6 _______________________________________________________________________________________

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