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PDF PI3V724 Data sheet ( Hoja de datos )
| Número de pieza | PI3V724 | |
| Descripción | 1 to 2 VGA Demux | |
| Fabricantes | Pericom Semiconductor Corporation | |
| Logotipo |  |
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PI3V724
1 to 2 VGA Demux
Features
ÎÎFull VGA 1:2 demux with VSIS compliance
àà R, G, B, Hsync, Vsync, DDC data, and DDC clk
channels are switched
ÎÎIntegrated monitor detection circuit allows Automatic or
manual control
ÎÎGenerates hot plug output signal to inform system when
monitor is present or not
ÎÎDual Power Supply, 3.3V and 5V
ÎÎIntegrated DDC level shifter from 5V to 3.3V(bi-directional)
ÎÎIntegrated 5V H/V output buffer with +/-24mA drive
ÎÎESD tolerance on video I/O pins up to +/-4kV contact per
IEC61000-4-2 specification
ÎÎ-3dB BW of 1.7GHz (typ)
ÎÎLow Xtalk, (-38dB typ)
ÎÎLow and Flat ON-STATE resistance (Ron = 4-Ohm,
Ron(Flat) = 0.5ohm, typ)
ÎÎLow input/output capacitance (Con = 5.6pF, typ)
ÎÎPackaging (Pb-free and Green):
àà 32-contact TQFN (ZL)
Description
Pericom’s PI3V724 is a 7-channel video mux/demux used to
switch between multiple VGA sources or end points. In a note-
book application where analog video signals are found in both
the notebook and the dock, a switch solution is required to switch
between the two video port locations. With the high bandwidth
of ~1.7GHz, the signal integrity will remain strong even through
the long FR4 trace between the notebook and the docking sta-
tion. In addition to high signal performance, the video signals are
also protected against high ESD with integrated diodes to VDD
and GND that will support up to +/-4kV contact ESD protection.
In addition to switching, the product also integrates a monitor
detection feature. The monitor detection feature works indepen-
dently on each of the two outputs and allows automatic switching
as well as a self generated HPD signal that lets the system know
when a monitor is connected or disconnected.
Pin Diagram
R
G
GND
VDD
B
H_SOURCE
V_SOURCE
MS
SDA_SOURCE
SCL_SOURCE
Rref
32 31 30 29 28
1 27
2 26
3 25
4 24
5 23
6 GND 22
7 21
8 20
9 19
10 18
11 17
12 13 14 15 16
R1
R2
G1
G2
VDD
B1
B2
H1_OUT
H2_OUT
V1_OUT
V2_OUT
14-0168
1 www.pericom.com 10/22/14
1 page  
PI3V724
1 to 2 VGA Demux
Application Note
Introduction
PI3V724 is a full VGA de-mux switch with integrated monitor detection circuit. Port switching can be selected manually or auto-
matically to offer more flexibility to users.
Automatic Monitor Detection
If MS pin (pin 8) is set to low or float, PI3V724 enters auto switch mode. When external monitor(s) is/are properly detected,
PI3V724 can support automatic switching.
Detection Pulse
When auto switch mode is selected via MS pin, PI3V724 sends a detection pulse through BLUE signal to check if any termination is
present. Once a monitor is attached, its termination is determined. PI3V724 will switch to the port with such termination accord-
ingly.
Result
detect
EN
B1
Result
B
V
V
detect
EN B2
MS
Priority/SEL
CE
Rref
VV
Logic
Control
Detection Start Logic
Timer
pulse
PI3V724 Detection Block Diagram
A detection pulse is sent by PI3V724 every 1.6 seconds when source or sink is not attached. Furthermore, the detection pulse is sent
immediately after sensing Vsync pulse. The detection pulse is of the width within 30us and the voltage level around 0.7V.
14-0168
PI3V724 Detection Pulse on Blue B2 without Source or Sink Device
5 www.pericom.com 10/22/14
5 Page 
PI3V724
1 to 2 VGA Demux
Application Diagram for DDC path
14-0168
11 www.pericom.com 10/22/14
11 Page | ||
| Páginas | Total 14 Páginas | |
| PDF Descargar | [ Datasheet PI3V724.PDF ] | |
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