MAX4456EPL 查看數據表（PDF） - Maxim Integrated

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MAX4456EPL

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

Maxim Integrated 

Low-Cost 4x4, 8x4, 8x8

Video Crosspoint Switches

MAX497

5 IN0

OUT0 39

2 IN0

OUT0 16

75Ω

Z0 = 75Ω

AV = 2

8 INPUT

VIDEO

CHANNELS

7 IN1

9 IN2

11 IN3

13 IN4

OUT1 37

OUT2 35

OUT3 33

OUT4 31

4 IN1

6 IN2

8 IN3

OUT1 14

OUT2 12

OUT3 10

75Ω

15

17

IN5

IN6

MAX4456

OUT5

OUT6

29

27

19 IN7

OUT7 25

VCC GND VEE

9,15

1, 3, 5, 7 11,13

CE 24

-5V

EDGE/LEVEL 14

22 LATCH

LOAD 8

14

1

2

21 WR

V+ 40

V+ 26

+5V

3

4

2 D0/SER IN

AGND 28, 30, 32

18

19

20

21

5

6

7

8

1 D1/SER OUT

38 D2

36 D3

6 A0

DGND

V-

V-

CE

10, 12

20

34

23

-5V

22

4 A1

SER/PAR 18

23

3 A2

V+ 16

+5V

24

25

DB–25

NOTE: ALL BYPASS CAPACITORS ARE 0.1µF CERAMIC.

Figure 2. MAX4456 (plastic DIP) Typical Application Circuit

Typical Application

Figure 2 shows a typical application of the MAX4456

(PDIP) with MAX497 quad, gain-of-two buffers at the

outputs to drive 75Ω loads. This application shows the

MAX4456 digital-switch control interface set up in the 7-

bit parallel mode. The MAX4456 uses seven data lines

and two control lines (WR and LATCH). Two additional

lines may be needed to control CE and LOAD when

using multiple MAX4456s.

The input/output information is presented to the chip at

A2, A1, A0, and D3–D0 by a parallel printer port. The

data is stored in the 1st-rank registers on the rising

edge of WR. When the LATCH line goes high, the

switch configuration is loaded into the 2nd-rank regis-

ters, and all eight outputs enter the new configuration at

the same time. Each 7-bit word updates only one out-

put buffer at a time. If several buffers are to be updat-

ed, the data is individually loaded into the 1st-rank reg-

isters. Then, a single LATCH pulse is used to reconfig-

ure all channels simultaneously.

The short BASIC program in Figure 3 loads program-

ming data into the MAX4456 from any IBM PC or com-

patible. It uses the computer’s “LPT1” output to interface

to the circuit, then automatically finds the address for

LPT1 and displays a table of valid input values to be

used. The program does not keep track of previous

commands, but it does display the last data sent to

LPT1, which is written and latched with each transmis-

sion. A similar application is possible with the

MAX4359/MAX4360.

Chip Information

MAX4359 TRANSISTOR COUNT: 2372

MAX4360 TRANSISTOR COUNT: 2372

MAX4456 TRANSISTOR COUNT: 3820

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