MAX456CPL Maxim Integrated Products, MAX456CPL Datasheet

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MAX456CPL

Manufacturer Part Number
MAX456CPL
Description
8 x 8 video crosspoint switch.
Manufacturer
Maxim Integrated Products
Datasheet

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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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MAX456CPL Summary of contents

Page 1

... 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 ______________Ordering Information PART MAX456CPL MAX456CQH MAX456C/D Ordering Information continued on last page. * Dice are specified at T _________________Pin Configurations TOP VIEW ...

Page 2

Video Crosspoint Switch ABSOLUTE MAXIMUM RATINGS Total Supply Voltage (V+ to V-) ...........................................+12V Positive Supply Voltage V+ Referred to AGND......-0.3V to +12V Negative Supply Voltage V- Referred to AGND .....-12V to +0.3V DGND Voltage.........................................................AGND ±0.3V Buffer Short ...

Page 3

ELECTRICAL CHARACTERISTICS (V+ = 5.0V -5.0V, -1.3V ≤ V ≤ +1.3V, LOAD = +5V, internal load resistors on, AGND = DGND = 0V unless otherwise noted.) PARAMETER X DYNAMIC SPECIFICATIONS (Note 1) Output-Buffer Slew Rate Internal ...

Page 4

Video Crosspoint Switch ______________________________________________________________Pin Description PIN DIP PLCC — 1, 12, 23 D1/SER OUT 2 3 D0/SER A2 10, ...

Page 5

Description Output Buffers The MAX456 video crosspoint switch consists of 64 T-switches grid (Figure 1). The 8 matrix out- puts are followed by 8 wideband buffers optimized for driving 400Ω and 20pF loads. Each ...

Page 6

Video Crosspoint Switch Table 1. Parallel-Interface Mode Functions A2-A0 D3-D0 0000 to 0111 Connect the buffer selected by A2-A0 to the input channel selected by D3-D0. Connect the buffer selected by A2-A0 to DGND. Note, if the ...

Page 7

IN0 IN1 IN2 IN3 SER/PAR A0 A1 D0/SER IN Figure 1. MAX456 Functional Diagram Table 3. Input/Output Line Configurations SERIAL PARALLEL Parallel L H Input Parallel L L Input Note : X = Don't Care, ...

Page 8

Video Crosspoint Switch ________________Typical Application Figure 2 shows a typical application of the MAX456 with MAX470 quad, gain-of-two buffers at the outputs to drive 75Ω loads. This application shows the MAX456 digital-switch control interface set up in ...

Page 9

Figure 3. BASIC Program for Loading Data into the MAX456 from a PC Using Figure 2's Circuit ____________________________________________________________Timing Diagrams A0-A2 VALID DATA N-1 D0-D3 WR LATCH Figure 4. Write Timing for Serial- and Parallel-Interface Modes _______________________________________________________________________________________ Video ...

Page 10

Video Crosspoint Switch _______________________________________________Timing Diagrams (continued) SEE FIGURE 4 FOR WR AND LATCH TIMING WR LATCH FIRST-RANK REGISTER DATA SECOND-RANK REGISTER DATA (EDGE/LEVEL = Low) SECOND-RANK REGISTER DATA (EDGE/LEVEL = High) Figure 5. Parallel-Interface Mode Format (SER/ ...

Page 11

Test Circuits OUT0 IN0 OUT1 IN1 IN2 OUT2 MAX456 IN3 OUT3 IN4 OUT4 IN5 OUT5 IN6 OUT6 IN7 OUT7 LOAD V = 2Vp-p, SWEEP FREQUENCY 3dB Bandwidth (Notes 1-4) IN0 OUT0 IN1 OUT1 ...

Page 12

... Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time. 12 __________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 (408) 737-7600 © 1994 Maxim Integrated Products ...

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