GX434 Monolithic 4x1
Video Multiplexer
DATA SHEET
CIRCUIT DESCRIPTION
FEATURES
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.
• 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
Unlike devices using MOS bilateral switching elements, these
bipolarcircuitsrepresentfullybuffered,unilateraltransmission
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.
• 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
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
inputsareTTLand5voltCMOScompatibleprovidingaddress
and chip select functions. When the chip is not selected, the
output goes to a high impedance state.
APPLICATIONS
Glitch free analog switching for...
• High quality video routing
PIN CONNECTIONS
• A/D input multiplexing
TOP VIEW
• Sample and hold circuits
• TV/ CATV/ monitor switching
IN 0
GND
IN 1
+8V
AO
A1
PIN 1
14
TOP VIEW
IN 0
GND
IN 1
PIN 1
16
+8V
NC
AO
GND
IN 2
CS
AVAILABLE PACKAGING
GND
IN 2
A1
O/P
CS
14 pin DIP and 16 pin SOIC (wide)
GND
NC
REXT
GND
IN 3
NC
O/P
NC
REXT
IN 3
7
8
-8V
8
9
-8V
PIN CONNECTION
16 PIN SOIC
PIN CONNECTION
14 PIN DIP
FUNCTIONAL BLOCK DIAGRAM
(wide)
GX434
IN 0
X
TRUTH TABLE
IN 1
X
OUTPUT
IN 2
X
CS A1 A0
OUTPUT
0
0
0
0
0
1
IN 0
IN 1
IN 3
X
0
0
1
1
0
1
IN 2
IN 3
A 0
A 1
CHIP
SELECT
2 TO 4 DECODER
LOGIC
CS
1
X
X
HI - Z
X = DON'T CARE
Document No. 510 - 34 - 2
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 Miyamae Village, 2–10–42 Miyamae, Suginami–ku, Tokyo 168, Japan tel. (03) 3334-7700 fax (03) 3247-8839