MAX456 Maxim, MAX456 Datasheet
MAX456
Manufacturer Part Number
MAX456
Description
8 x 8 Video Crosspoint Switch
Manufacturer
Maxim
Datasheet
1.MAX456.pdf
(12 pages)
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The MAX456 is the first monolithic CMOS 8 x 8 video
crosspoint switch that significantly reduces component
count, board space, and cost. The crosspoint switch
contains a digitally controlled matrix of 64 T-switches
that connect eight video input signals to any, or all, out-
put channels. Each matrix output connects to eight
internal, high-speed (250V/µs), unity-gain-stable buffers
capable of driving 400Ω and 20pF to ±1.3V. For appli-
cations requiring increased drive capability, the
MAX456 outputs can be connected directly to two
MAX470 quad, gain-of-two video buffers, which are
capable of driving 75Ω loads.
Three-state output capability and internal, programma-
ble active loads make it feasible to parallel multiple
MAX456s and form larger switch matrices.
In the 40-pin DIP package, crosstalk (70dB at 5MHz) is
minimized, and board area and complexity are simpli-
fied by using a straight-through pinout. The analog
inputs and outputs are on opposite sides, and each
channel is separated by a power-supply line or quiet
digital logic line.
________________________Applications
19-2858; Rev 2; 2/94
Call toll free 1-800-998-8800 for free samples or literature.
OUTPUT
_______________General Description
SELECT
________Typical Application Circuit
SELECT
SERIAL
INPUT
OR
I/O
Video Test Equipment
Video Security Systems
Video Editing
A2
A1
A0
D3
D2
D1/SER OUT
D0/SER IN
WR
LATCH
8 INPUT CHANNELS
T-SWITCH
MAX456
MATRIX
8 X 8
________________________________________________________________ Maxim Integrated Products
MAX470
MAX470
A
A
V
V
= 2
= 2
75
8 x 8 Video Crosspoint Switch
75
____________________________Features
Ordering Information continued on last page.
* Dice are specified at T
_________________Pin Configurations
______________Ordering Information
MAX456CPL
MAX456CQH
MAX456C/D
Routes Any Input Channel to Any Output Channel
Switches Standard Video Signals
Serial or Parallel Digital Interface
Expandable for Larger Switch Matrices
80dB All-Channel Off Isolation at 5MHz
8 Internal Buffers with:
250V/µs Slew Rate, Three-State Output Capability,
Power-Saving Disable Feature, 35MHz Bandwidth
PLCC on last page
TOP VIEW
PART
D1/SER OUT
EDGE/LEVEL
D0/SER IN
SER/PAR
DGND
DGND
LOAD
IN3
IN4
IN0
IN1
IN2
IN5
IN6
IN7
A2
A1
A0
V+
V-
10
11
12
13
14
15
16
17
18
19
20
TEMP. RANGE
1
2
3
4
5
6
7
8
9
0°C to +70°C
0°C to +70°C
0°C to +70°C
A
= +25°C, DC parameters only.
MAX456
DIP
40
39
38
37
36
35
34
33
32
31
30
29
28
27
26
25
24
23
22
21
40 Plastic DIP
44 PLCC
Dice*
V+
OUT0
D2
AGND
OUT5
AGND
PIN-PACKAGE
OUT1
D3
OUT2
V-
OUT3
AGND
OUT6
V+
OUT7
CE
CE
LATCH
OUT4
WR
1
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