GENNUM CORPORATION P.O. Box 489, Stn A, Burlington, Ontario, Canada L7R 3Y3

tel. (905) 632-2996 fax: (905) 632-5946

Japan Branch: A-302 M i yamae Vi l l age, 2–10–42 M i yamae, Suginami–ku, Tokyo 168, Japan

tel. (03) 3334-7700

fax (03) 3247-8839

X = DON'T CARE

CS

A1

A0

OUTPUT

0

0

0

IN 0

0

0

1

IN 1

0

1

0

IN 2

0

1

1

IN 3

1

X

X

HI - Z

TRUTH TABLE

X

X

X

X

CHIP

SELECT

2 TO 4 DECODER

LOGIC

FUNCTIONAL BLOCK DIAGRAM

OUTPUT

CS

IN 0

IN 1

IN 2

IN 3

A 0

A 1

AVAILABLE PACKAGING

14 pin DIP and 16 pin SOIC (wide)

DATA SHEET

CIRCUIT DESCRIPTION

The GX434 is a high performance low cost monolithic 4x1

video multiplexer incorporating four bipolar switches with a

common output, a 2 to 4 address decoder and fast chip select

circuitry. The chip select input allows for multi-chip paralleled

operation in routing matrix applications. The chip is selected

by applying a logic 0 on the chip select input.

Unlike devices using MOS bilateral switching elements, these

bipolar circuits represent fully buffered, unilateral transmission

paths when selected. This results in extremely high output to

input isolation. They also feature fast make-before-break

switching action. These features eliminate such problems as

switching 'glitches' and output-to-input signal feedthrough.

The GX434 operates from

±7 to ± 13.2 volt DC supplies. They

are specifically designed for video signal switching which

requires extremely low differential phase and gain. Logic

inputs are TTL and 5 volt CMOS compatible providing address

and chip select functions. When the chip is not selected, the

output goes to a high impedance state.

GX434 Monolithic 4x1

Video Multiplexer

Document No. 510 - 34 - 2

FEATURES

• low differential gain: 0.03% typ. at 4.43 MHz

• low differential phase: 0.012 deg. typ. at 4.43 MHz

• low insertion loss: 0.05 dB max at 100 kHz

• low disabled power consumption: 5.2 mW typ.

• high off isolation: 110 dB at 10 MHz

• all hostile crosstalk @ 5 MHz, 97 dB typ.

• bandwidth (-3dB) with 30 pF load, 100 MHz typ.

• fast make-before-break switching: 200 ns typ.

• TTL and 5 volt CMOS compatible logic inputs

• low cost 14 pin DIP and16 pin SOIC packages

• optimised performance for NTSC, PAL and SECAM

applications

APPLICATIONS

Glitch free analog switching for...

• High quality video routing

• A/D input multiplexing

• Sample and hold circuits

• TV/ CATV/ monitor switching

IN 0

GND

IN 1

GND

GND

IN 2

IN 3

NC

NC

+8V

-8V

NC

O/P

CS

A1

AO

TOP VIEW

PIN 1

8

16

9

PIN CONNECTION

16 PIN SOIC

IN 0

PIN CONNECTION

14 PIN DIP

GND

IN 1

GND

IN 3

GND

IN 2

AO

+8V

A1

CS

O/P

NC

-8V

PIN 1

78

14

TOP VIEW

R

EXT

R

EXT

GX434

(wide)

PIN CONNECTIONS