PI3VST01

PI3VST01
PI3VST01
HPD signal Generator for VGA
Features
Description
ÎÎHot Plug Detect Signal Generator for VGA connectors
The VGA connector does not have a hot-plug pin to tell the system that a monitor is connected. More recent video standards,
such as HDMI and DisplayPort, save power by adding a hot-plug
pin which allows graphics outputs to be powered down when a
monitor is not connected.
ÎÎGenerates hot plug output signal telling system when
monitor is present or not
ÎÎPower Supply, 3.3V and 5.0V
ÎÎESD tolerance on pin 7 is up to +/-4kV contact per
Pericom’s PI3VST01 HPD signal generator generates a monitor
detection signal from a VGA source connector to tell the VGA
source if an external monitor is connected or not.
IEC61000-4-2 specification
ÎÎ-3dB BW of 1.7GHz (typ)
ÎÎ4.75 Ohm On Resistance with 0.5 Ohm flatness (typ)
PI3VST01 allows notebook makers to shut off the VGA DAC
when a monitor is not connected, thus saving 170 mW per DAC.
PI3VST01 dissipates only 0.66 mW.
ÎÎLow input/output capacitance (Con = 4.5pF, typ)
ÎÎPackaging (Pb-free and Green):
àà 8-contact MSOP (U)
The monitor detection scheme within the PI3VST01 will not
affect normal operation of the video driver.
Pin Configuration-U8 (Top View)
Block Diagram
V
V
BOUT
5
V
VDD3
6
Detector
HPD_OUT
7
Logic
Control
8
VSYNC
4
VSYNC
3
BIN
2
VDD5
BOUT
BIN
1
GND
Rref
HPD_OUT
RREF
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PI3VST01
HPD signal Generator for VGA
Pinout Table
Pin #
Pin Name
1
GND
Ground
Ground
2
VDD5
Power
5V ± 10% power rail
3
BIN
I
Blue input from VGA source
4
VSYNC
I
Vertical Synchronization signal, internal 250KOhm pulldown
8
I/O Type
HPD_OUT O
7
VDD3
6
BOUT
5
Rref
Description
Open drain output, telling the system the status of the external VGA monitor. If VGA
monitor is present, this pin will be pulled low. If VGA monitor is not present, this pin will
be Hi-z
Power
3.3V ± 10% power rail
O
Blue output to VGA connector
I/O
Determines IC mode in terms of impedance detection levels. connect to external resistor
to GND. Resistor values can be determined by looking at truth table
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PI3VST01
HPD signal Generator for VGA
Absolute Ratings (Above which the useful life may be impaired. For user guidelines, not tested)
Note:
VDD3 (Power Supply)……….......……….…..-0.5V to 4.0V
Stresses greater than those listed under MAXIMUM RATINGS
may cause permanent damage to the device. This is a stress
VDD5 (Power Supply)..........................................-0.5V to 6V
o
o
rating only and functional operation of the device at these or
Storage Temperature…………........………-55 C to +150 C
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 Electrical Characteristics for Video Switching over Operating Range
(TA= –40°C to +85°C, VDD3 = 3.3V±10%, VDD5 = 5.0V±10%)
Parameters Description
Test Conditions
Min.
Typ.
Max.
Units
Switch On-Resistance, BIN to BOUT
VDD = Min., 0V ≤ Vinput ≤
1.2V, Iinput = –40mA
-
R FLAT(ON)
On-Resistance Flatness, BIN to BOUT
VDD = Min., Vinput @ 0V and
1.2V, Iinput = –40mA
-
VIH,VSYNC
Input High Voltage, VSYNC
2.4
VIL,VSYNC
Input Low Voltage, VSYNC
0
0.5
V
VOL,HPD_OUT
Output Low Voltage, HPD_OUT
IOL=2mA
0
0.4
V
IIL
Input leakage current, BIN
VIN = 0V
-1
1
uA
IIH
Input leakage current, BIN
VIN = 3.6V
-1
1
uA
IOZL
Output leakage current, BOUT
VOUT= 0V
-1
1
uA
IOZH
Output leakage current, BOUT
VOUT = 3.6V
-1
1
uA
IOZH,HPD_OUT
Output Leakage Current, HPD_OUT
VOZ =VDD
1
uA
RON
4.75
5.5
ohm
0.5
1
V
Power Supply Characteristics
(TA= –40°C to +85°C) Parameters
Description
Min.
Typ.
Max.
Units
IDD3
Current Consumption for 3.3V Rail, case 75//75 or 150//75
200
400
uA
IDD5
Current Consumption for 5V Rail, case 75//75 or 150//75
0.5
1
uA
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PI3VST01
HPD signal Generator for VGA
Dynamic Electrical Characteristics over Operating Range
(TA=-40º to+85ºC, VDD3 =3.3V±10%, GND=0V, VDD5 = 5.0V±10%)
Parameters Description
OIRR
BW
tPD
ILOSS
OFF Isolation,
BIN to BOUT
Test Conditions
Min.
f = 250MHz
Bandwidth –3dB,
BIN to BOUT
Propagation Delay,
BIN to BOUT
Insertion Loss for B path
with 75-Ohm load
Typ.
Max.
Units
-
-46
-
dB
-
2.0
-
GHz
-
90
-
ps
Freq = 10MHz (VGA)
-0.3
Freq = 100MHz (XGA)
-0.33
Freq = 300MHz (UXGA)
-0.4
dB
Capacitance (TA = 25°C, f = 1MHz)
Parameters
Description
Test Conditions
Typ.
Units
COFF
Capacitance, Switch OFF
2.4
pF
CON
Switch Capacitance between BIN and BOUT,
Switch ON
5.6
pF
Applications
VGA-DACs in chipsets as well as video chips (MXM, GPU, DP-to-VGA, PCIe, etc.) typically dissipate about 170 mW.
The VGA standard does not have a monitor detect feature, so the DAC dissipates power whether the monitor is connected or not.
PI3VST01 provides an HPD_OUT signal that detects the presence of a monitor. This HPD_OUT signal can be routed to the
chipset, directly, or through an MPU, to turn off the VGA DAC when a monitor is not connected. Using the PI3VST01, the system
can save 170 mW when the monitor is not connected.
PI3VST01 can also be used to enable automatic switching between two monitors. Another Pericom product, PI3V724 integrates 2
monitor detection circuits with a 1:2 VGA switch and offers both automatic and manual monitor switching.
VGA Termination
PI3VST01 can support two different termination schemes:
1. Case_75//75: Reverse termination for the monitor is provided by a 75 Ohm resistor at the connector, as per the VESA VSIS
specification.
2. Case_150//75: Reverse termination for the monitor is split between a 150 Ohm resistor at the connector and a 150 Ohm resistor
at the video DAC, as required by some chipsets.
An external resistor must be supplied between the Rref pin and ground to tell the detection circuit which termination scheme is
being used. Values for this resistor are shown below.
Rref
330Kohm +/-5%
Application Case Supported
Case _150//75
200Kohm +/-5% Case _75//75
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PI3VST01
HPD signal Generator for VGA
Application Schematics
In order to ensure accurate color balance, gain and frequency response are matched between the R, G, and B channels using:
• 4.7 Ohm resistors in series with the R and G lanes,
• 8.2 pF capacitors to ground from the R and G lanes, and
• a 2 pF capacitor to ground on the B lane.
To pass the VESA VSIS specification, many VGA DACs require series inductors to reduce overshoot and undershoot.
A 47 kOhm resistor is used as a pullup for the open-drain HPD_OUT signal from the PI3VST01 to the VGA DAC control.
4.7 uF capacitors should be used to bypass both VDD5 and VDD3.
The schematic below illustrates the recommended design for the 150//75 case.
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PI3VST01
HPD signal Generator for VGA
The schematic below illustrates the recommended design for the 75//75 case.
Total power dissipation of this solution is very small. PI3VST01 power dissipation is 0.66 mW typical, which is a small fraction
(<1%) of the 170 mW saved when the monitor is not connected.
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PI3VST01
HPD signal Generator for VGA
Packaging Mechanical: 8-Pin MSOP (U)
14-0272
Please check for the latest package information on the Pericom web site at www.pericom.com/packaging/
Ordering Information
Ordering Code
Package Code
Package Description
PI3VST01UE
U
8-pin, Mini Small Outline Package (MSOP)
PI3VST01UEX
U
8-pin, Mini Small Outline Package (MSOP), Tape & Reel
• 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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