PI3V724
1 to 2 VGA Demux
Features
Description
ÎÎFull VGA 1:2 demux with VSIS compliance
Pericom’s PI3V724 is a 7-channel video mux/demux used to
switch between multiple VGA sources or end points. In a notebook 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 station. 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.
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
In addition to switching, the product also integrates a monitor
detection feature. The monitor detection feature works independently 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.
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):
CE
GND
3
25
VDD
B
4
24
5
23
G1
G2
VDD
GND
R1
R2
22
B1
7
21
8
20
B2
H1_OUT
9
19
10
18
SCL2
H2_OUT
V1_OUT
V2_OUT
VDD5_IN
11
17
12 13 14 15 16
SDA1
SDA_SOURCE
SCL_SOURCE
Rref
6
SDA2
SCL1
H_SOURCE
V_SOURCE
MS
1
OUT
Test
G
32 31 30 29 28
1
27
2
26
R
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GND
Priority/SEL
Pin Diagram
àà 32-contact TQFN (ZL)
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PI3V724
1 to 2 VGA Demux
Block Diagram
detect
V
V
Result
V
V
V
Result
V
EN
detect
B2
V
V
V
MS
B1
V
B
EN
V
Logic
Control
Priority/SEL
OUT
CE
V
V
Rref
Timer
pulse
Detection Start Logic
V
V
To timer
+5V
Buffer
V1
V_SOURCE
Buffer
V2
G
G1
R
R1
G2
R2
+5V
H_SOURCE
Buffer
H1_OUT
H2_OUT
Buffer
Control
Logic
SDA_SOURCE
SCL_SOURCE
SDA1
5V to 3.3V
Level Shifter
SCL1
SDA2
SCL2
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PI3V724
1 to 2 VGA Demux
Pinout Table
Pin #
Name
Type
Description
1
R
I/O
Red signal from source
2
G
I/O
Green signal from source
3
GND
Ground
Ground
4
Vdd
Power
3.3V Power Supply
5
B
I/O
Blue signal from source
6
H_Source
I
Horizontal Synchronous signal from source. Internal 300Kohm pull-down
7
V_Source
I
Vertical Synchronous signal from source. Internal 300Kohm pull-down
8
MS
I
Mode Select (switch between auto switch vs. manual switch). OUTx pins work
regardless of MS pin status. Internal pull down.
9
SDA_Source
I/O
DDC data signal from source
10
SCL_Source
I/O
DDC clock signal from source
11
Rref
I
Connect external resistor to ground to determine which application scheme
best matches your design. For actual R values, please see page 6
12
SDA1
I/O
DDC data signal from VGA connector 1
13
SDA2
I/O
DDC data signal from VGA connector 2
14
SCL1
I/O
DDC clock signal from VGA connector 1
15
SCL2
I/O
DDC clock signal from VGA connector 2
16
Vdd5_IN
I (Power)
5V input power supply
17
V2_out
O
Buffered, vertical synch signal output for VGA connector #2
18
V1_out
O
Buffered vertical synchronous signal driving VGA connector #1
19
H2_out
O
Buffered, horizontal synch signal output for VGA connector #2
20
H1_out
O
Buffered horizontal synchronous signal driving VGA connector #1
21
B2
I/O
Un-buffered, Blue signal driving VGA connector 2
22
B1
I/O
Un-buffered, Blue signal driving VGA connector 1
23
Vdd
Power
3.3V Power Supply
24
G2
I/O
Un-buffered, Green signal driving VGA connector 2
25
G1
I/O
Un-buffered, Green signal driving VGA connector 1
26
R2
I/O
Un-buffered, Red signal driving VGA connector 2
27
R1
I/O
Un-buffered, Red signal driving VGA connector 1
28
CE
I
Chip enable input. If signal is LOW, then chip is fully functional. If signal is
HIGH, then IC is powered down and all I/O’s are hi-z
29
OUT
O
open drain output describing external monitor status. If connected, OUT is
LOW, if not connected, OUT is hi-z. OUT will only provide the status of the
CHOSEN port.
Chosen port can be determined based on manual switching
or automatic switching (please see truth table for more information on how to
configure into auto mode or manual mode)
30
Priority/SEL
I
Output Port selection or output port priority depending on MS pin status
31
GND
Ground
Ground
32
Test
I
please tie high or leave floating for normal operation. internal pull-up
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PI3V724
1 to 2 VGA Demux
Truth Table
CE/
MS (Internal
pull-down)
Switching
Mode
0
0
0
Pin 30 Role
SEL
Priority
Result
Automatic
Switching
Priority Pin
N/A
0
Port1 has priority
0
Automatic
Switching
Priority Pin
N/A
1
Port 2 has priority
0
1
Manual SwitchSELpin
ing
0
N/A
Port 1 is active
0
1
Manual SwitchSELpin
ing
1
N/A
Port 2 is active
1
x
N/A
x
x
all I/O's hi-z
N/A
Automatic switching scheme
As external monitors are properly detected, the PI3V724 can support automatic switching.
If only one monitor is connected, then the port is easily chosen regardless of what pin 30 (priority) pin status is.
Port selection (only one monitor is present)
At power on, MS pin (pin 31) is checked to determine if auto switching is enabled or not (to enable, MS needs to be LOW). Next the
part will look to see if external monitors are connected or not. If only one monitor is connected, the PI3V724 will automatically enable the signal path to drive the connected the monitor. OUT pin will then be pulled LOW.
Port selection (both monitors are present)
At power on, MS pin (pin 31) is checked to determine if auto switching is enabled or not (to enable, MS needs to be LOW). Next the
part will look to see if external monitors are connected or not. If only both monitors are connected, the PI3V724 will then check
the priority pin (pin 30). If pin 30 is LOW, then port 1 will have priority and therefore will be activated. However, if pin 30 is HIGH,
then port 2 will have priority and therefore port 2 will be enabled.
State Machine Reset Procedure
•
If the monitor from chosen port is disconnected, the state machine is reset (to determine chosen port, see above).
•
If MS pin status changes, state machine is reset
•
If CE/ pin goes high then low again, state machine is reset
•
If Vdd goes low and then high again, state machine resets
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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 automatically 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 accordingly.
detect
V
V
Result
V
V
V
EN
V
V
B2
V
V
CE
Rref
detect
Logic
Control
V
Priority/SEL
Result
V
V
MS
B1
V
B
EN
Timer
pulse
Detection Start Logic
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.
PI3V724 Detection Pulse on Blue B2 without Source or Sink Device
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PI3V724
1 to 2 VGA Demux
PI3V724 Detection Pulse on Blue B2 Immediately after Vsync Pulse
The detection pulse is generated by PI3V724 within the back porch period, which is before active BLUE video is delivered.
Back Porch
Active Blue
Active Blue
Detection Pulse
PI3V724 Vsync Pulse (with Negative Polarity) vs. Blue B2 at 1024x768@60Hz
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PI3V724
1 to 2 VGA Demux
Back Porch
Active Blue
Active Blue
Detection Pulse
PI3V724 Vsync Pulse (with Positive Polarity) vs. Blue B2 at 1280x1024@60Hz
Port Selection
When PI3V724 is powered up, MS pin (pin 8) is checked to determine if auto switching is enabled or not. If MS pin is set to low,
PI3V724 will determine if any monitor is attached. If only one monitor is connected, PI3V724 will automatically en¬able the signal
path to the attached monitor. /OUT pin (pin 29) will then be pulled low to indicate the presence of a monitor at the chosen port. If
two monitors are attached to both output ports, PI3V724 will check the Priority pin (pin 30). If Priority pin is set to low, output port
1 will be prioritized and thus active. On the other hand, if Priority pin is high, output port 2 will be prioritized and thus enabled. /
OUT pin will then be pulled low.
Application Scheme
With proper reference resistor assembled to Rref pin (pin 11), monitors with various application schemes can be determined automatically.
Rref External Value Truth Table
Rref
Application Case supported (see page 8 for drawings)
330Kohm
Case_150//75
250Kohm
Case_75//75
500K
Case_75
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PI3V724
1 to 2 VGA Demux
State Machine
If monitor is unplugged
If monitor on port 1 is removed or
if priority pin changes
If monitor on port is removed or
if priority pin changes
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PI3V724
1 to 2 VGA Demux
Output Pin Behavior (Pin 29) with Auto Switch Enabled
Priority
(0 = port 1)
(1 = port 2)
MS
Port 1
monitor Status
0 = Unplug,
1 = plug
Port 2 monitor
Status
0 = Unplug,
1 = plug
Port 1 Path
Port 2 Path
Out Status
0
0
0
0
ON
OFF
Hi Z
0
0
0
1
OFF
ON
Low
0
0
1
0
ON
OFF
Low
0
0
1
1
ON
OFF
Low
0
1
0
0
OFF
ON
Hi Z
0
1
0
1
OFF
ON
Low
0
1
1
0
ON
OFF
Low
0
1
1
1
OFF
ON
Low
Output Pin Behavior (Pin 29) with Manual Switching Mode Enabled
Priority
(0 = port 1)
(1 = port 2)
MS
Port 1
monitor Status
0 = Unplug,
1 = plug
Port 2 monitor
Status
0 = Unplug,
1 = plug
Port 1 Path
Port 2 Path
Out Status
1
0
0
x
ON
OFF
Hi Z
1
0
1
x
ON
OFF
Low
1
1
x
0
OFF
ON
Hi Z
1
1
x
1
OFF
ON
Low
Rref (Pin 11) external value Truth Table
Rref
Application Case supported (see page 8 for drawings)
330Kohm
Case_150//75
250Kohm
Case_75//75
500K
Case_75
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PI3V724
1 to 2 VGA Demux
Dock
150
R1
GPU
150
R2
75
R3
75
R4
75
R5
Monitors
724
Notebook
Case_75//75
PI3V724 Application Drawing for case 75//75
Dock
GPU 150
Ra
150
Rb
75
Rc
150
Rd
75
Re
Monitors
724
Notebook
Case_150//75
PI3V724 Application Drawing for case 150//75
Dock
75
Rc
GPU
75
Ra
Monitors
724
75
Re
Notebook
Case_75
PI3V724 Application Drawing for case 75
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PI3V724
1 to 2 VGA Demux
Application Diagram for DDC path
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PI3V724
1 to 2 VGA Demux
Maximum Ratings
(Above which useful life may be impaired. For user guidelines, not tested.)
VDD (Power Supply)……………………………………..………3.0V to 3.6V
VDD5_IN(Power Supply)……………………………………….4.5V to 5.5V
Operating Ambient Temperature………………………….40oC to +85oC
Storage Temperature………………………………………-55oC to +150oC
Note: Stresses greater than those listed under MAXIMUM RATINGS may cause permanent damage to the device. This is a stress
rating only and functional operation of the device at these or any
other conditions above those indicated in the operational sections
of this specification is not implied. Exposure to absolute maximum
rating conditions for extended periods may affect reliability.
DC ElectricalCharacteristics for Video Switching over Operating Range
(TA= –40°C to +85°C,VDD = 3.3V±10% ,VDD5_IN = 5V)
Parameters Description
Test Conditions(1)
Min.
Typ.(2)
Max.
Units
VIH
Input HIGH Voltage (SEL/Priority and
MS pins)
Guaranteed HIGH level
2
-
-
V
VIL
Input LOWVoltage (SEL/Priority, and
MS pins)
Guaranteed LOW level
–0.5
-
0.8
V
VIK
Clamp Diode Voltage
VDD = Max., ISELx = –18mA
-
–0.8
–1.2
V
IIH
Input HIGH Current (SEL/Priority)
VDD = Max., VSELx = VDD
-
-
±5
µA
IIL
Input LOW Current (SEL/Priority)
VDD = Max., VSELx = GND
-
-
±5
µA
IOFF_H/V
Power Down Leakage Current for H/V
channels only
VDD = 0V, VB = 0V, VA ≤ 3.6
-
-
22
mA
IOFF_DDC
Power Down Leakage Current for DDC
channels only
VDD = 0V, VB = 0V, VA ≤ 3.6
-
-
±5
mA
switch leakage when switch is off
VDD = 3.6V, CE/ = High, Vinput
= 0V to Vdd
±5
µA
RON_RGB
Switch On-Resistance for RGB path (3)
VDD = Min., 0V ≤ Vinput ≤
1.2V, Iinput = –40mA
-
4.8
5.6
Ω
R FLAT(ON)
On-Resistance Flatness for RGB path (4)
VDD = Min., Vinput @ 0V and
1.2V, Iinput = –40mA
-
0.5
+1
Ω
∆RON
On-Resistance match from center ports
to any other port (RGB path only)(4)
VDD = Min., 0V ≤ Vinput ≤
1.2V, Iinput = –40mA
-
0.1
1
Ω
VOH (H/V)
Output high for H1_out/V1_out signals
VDD5 = 5V, IOH = -24mA
3.0
VDD5
V
VOL(H/V)
Output low for H1_out/V1_out signals
VDD5 = 5V, IOL = 24mA
0
0.8
V
Vout_DDC
DDC switch path ouput voltage
Vdd = min, Vinput = >2V
(either side, since DDC path is
bi-directional).
IOZ (DDC and
RGB path)
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PI3V724
1 to 2 VGA Demux
Capacitance (TA = -40º to+85ºC, f = 1MHz)
Parameters(4)
Description
CIN
Test Conditions(1)
Typ.(2)
Units
Input Capacitance
2.0
pF
COFF _COM
RGB Capacitance, Switch OFF
3.4
pF
COFF _P1P2
R1, G1, B1 or R2, G2, B2 switch off capacitance
2.4
pF
CON_RGB
RGB Switch Capacitance, Switch ON B path
5.8
pF
CON_DDC
DDC Switch Capacitance, Switch ON
5.8
pF
Power Supply Characteristics
Parameters
Description
Test Conditions(1)
Min.
Typ.(2)
Max.
Units
ICC _ 3.3V rail
Quiescent Power Supply
Current for 3.3V power rail
VDD = 3.6V, 5V_VDD = 5.5V VSEL =
GND or VDD
-
250
500
µA
ICC_Vdd5_IN
Quiescent Power supply
current for 5VVDD
5V_VDD = 5.5V, VDD = 3.6V, VSEL=
GND or VDD
100
500
nA
Iccq_3.3V
Chip disabled
CE/ = HIGH
10
Iccq_Vdd5_IN
Chip disabled
CE/ = HIGH
100
µA
500
nA
Dynamic Electrical Characteristics Over the Operating Range
(TA=-40º to+85ºC,VDD=3.3V±10%, GND=0V)
Parameters Description
Test Conditions
Min.
Typ.(2)
Max.
Units
XTALK
Crosstalk
f = 250MHz, See Fig. 2
-
-38
-
dB
OIRR
OFF Isolation
f = 250MHz, See Fig. 3
-
-46
-
dB
BW
Bandwidth –3dB
See Fig. 1
-
1.7
-
GHz
Freq = 10MHz (VGA)
-1.77
dB
Freq = 100MHz (XGA)
-1.88
dB
Freq = 300MHz
(UXGA)
-2.09
dB
Insertion Loss for
RGB path
ILOSS
with 75-Ohm load
Parameters Description
Min.
Typ.(2)
Max.
Units
tPD
Propagation Delay(2,3)
-
0.25
tPZH, tPZL
Line Enable Time -SELto Input, Output
0.5
-
15
ns
tPHZ , tPLZ
Line Disable Time -SELto Input, Output
0.5
-
10
ns
tSK(p)
Skew between opposite transitions of the same output
(tPHL-tPLH) (2)
0.1
0.2
ns
Trise (H/V)
Horizontal/Vertical synchronous output rise time
(H1_out, V1_out)
1.5
ns
Tfall (H/V)
Horizontal/Vertical synchronous output fall time
(H1_out, V1_out)
1.6
ns
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PI3V724
1 to 2 VGA Demux
Packaging Mechanical: 32-Pin TQFN (ZL)
1
DATE: 10/09/09
DESCRIPTION: 32-contact, Thin Fine Pitch Quad Flat No-Lead (TQFN)
PACKAGE CODE: ZL (ZL32)
REVISION: A
DOCUMENT CONTROL #: PD-2044
09-0125
Ordering Information
Ordering Code
Package Code
Package Description
PI3V724ZLE
ZL
32-contact, Thin Fine Pitch Quad Flat No-Lead (TQFN)
Notes:
• Thermal characteristics can be found on the company web site at www.pericom.com/packaging/
• E = Pb-free and Green
• X suffix = Tape/Reel
Pericom Semiconductor Corporation • 1-800-435-2336
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