GX4404 Wideband, Monolithic
4x1 Video Multiplexer
2-
DATA SHEET
FEATURES
•
low differential phase and gain
•
wide bandwidth, 200 MHz at -3 dB
•
small switching transient
•
±
4.5 to
±
5.5 volts supplies
•
individual TALLY outputs
CIRCUIT DESCRIPTION
The GX4404 is a wideband video multiplexer implemented
in bipolar technology. This device is characterized by
excellent differential phase and gain in the enabled state,
very high off-isolation in the disabled state. Fully buffered
unilateral signal paths ensure negligible output to input
feedback, while delivering minimal output switching transients
through make-before-break switching.
For use in NxM routing matrices, these devices feature a
very high, nearly constant input impedance coupled with
high output impedance in the disabled state. This allows
multiple devices to be paralleled at the inputs and outputs
without additional circuitry.
The chip is disabled when a logic HIGH is applied to the CS
control pin. In this case, regardless of the ADDRESS data,
the output of the device assumes a high impedance state.
Individual PNP to V
CC
TALLY outputs provide positive
indication of crosspoint selection.
All logic inputs are TTL and 5V CMOS compatible. Supply
voltages can be between
±
4.5 to
±
5.5 volts.
FUNCTIONAL BLOCK DIAGRAM
TALLY OUTPUTS
T0
T1
T2
T3
IN 0
IN 1
IN 2
IN 3
X
X
X
X
X
OUTPUT
APPLICATIONS
2 TO 4 DECODER
CHIP
SELECT
• HDTV
• Very high quality video switching
• Very high density video switching
• Computer graphics
A0
A1
CS
PIN CONNECTIONS
IN 0
GND
IN 1
T1
T2
IN 2
GND
IN 3
T0
V
CC
A0
A1
CS
OUT
V
EE
T3
• PCM / data routing matrices
TRUTH TABLE
TALLY O/Ps
CS A1 A0
OUT
T0
T1
T2
T3
0
0
0
0
1
0
0
1
1
X
0
1
0
1
X
IN 0
IN 1
IN 2
IN 3
HI - Z
ON
*
*
*
*
*
*
*
ON *
*
* ON *
*
* ON
*
*
*
16 PIN
‘NARROW’ SOIC
(& 16 PIN PDIP)
X = DON'T CARE
*
=
OFF (high impedance)
ORDERING INFORMATION
AVAILABLE PACKAGING
16 pin PDIP
16 pin SOIC
Tape 16 pin (N) SOIC
Part Number
Package Type
Temperature Range
o
GX4404-CDC
GX4404-CKD
GX4404-CTD
16 pin PDIP
16 pin (N) SOIC
Tape16 pin (N) SOIC
0 to 70 C
o
0 to 70 C
o
0 to 70 C
Document No. 520 - 43 - 1
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
GENNUM [ GENNUM CORPORATION ]
