DATASHEET SEARCH SITE | WWW.ALLDATASHEET.COM

Document overview

  • Manufacturer or author: Provided By ALLDATASHEET.COM(FREE DATASHEET DOWNLOAD SITE)
  • PDF pages: 7

Technical content

Features

Î ÎHot Plug Detect Signal Generator for VGA connectors Î Î Generates hot plug output signal telling system when monitor is present or not Î Î Power Supply, 3.3V and 5.0V Î Î ESD tolerance on pin 7 is up to +/-4kV contact per IEC61000-4-2 specification Î Î -3dB BW of 1.7GHz (typ) Î Î4.75 Ohm On Resistance with 0.5 Ohm flatness (typ) Î Î Low input/output capacitance (Con = 4.5pF, typ) Î Î Packaging (Pb-free and Green): à 8 -contact MSOP (U) PI3VST01 HPD signal Generator for VGA V V VLogic Control Detector HPD_OUT BOUTBIN VSYNC RREF 4 3 2 1 5 6 7 8 GND BIN VSYNC HPD_OUT BOUT Rref DD5V DD3V Pin Configuration-U8 (Top View) 15-0090

www.pericom.com 07/08/15 PI3VST01 HPD signal Generator for VGA All trademarks are property of their respective owners. Pinout Table Pin # Pin Name I/O Ty pe Description

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 HPD_OUT O

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 7 V DD3 Power 3.3V ± 10% power rail

6 BOUT O Blue output to VGA connector

5 Rref 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 15-0090

www.pericom.com 07/08/15 PI3VST01 HPD signal Generator for VGA All trademarks are property of their respective owners. Absolute Ratings Above which the useful life may be impaired. For user guidelines, not tested) 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. (TA= –40°C to +85°C, VDD3 = 3.3V±10%, VDD5 = 5.0V±10%) Parameters Description Test Conditions Min. Ty p. Max. Units RON Switch On-Resistance, BIN to BOUT VDD = Min., 0V ≤ Vinput ≤ 1. 2V, Iinput = –40mA - 4.75 5.5 ohm RFLAT(ON) On-Resistance Flatness, BIN to BOUT VDD = Min., Vinput @ 0V and 1. 2V, Iinput = –40mA - 0.5 1 VIH,VSYNC Input High Voltage, VSYNC 2.4 V 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 V OZ =VDD 1 uA Parameters Description Min. Ty p. 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 Power Supply Characteristics (TA= –40°C to +85°C) 15-0090

www.pericom.com 07/08/15 PI3VST01 HPD signal Generator for VGA All trademarks are property of their respective owners. Parameters Description Test Conditions Min. Ty p. Max. Units OIRR OFF Isolation, BIN to BOUT f = 250MHz - -46 - dB BW Bandwidth –3dB, BIN to BOUT - 2.0 - GHz tPD Propagation Delay, BIN to BOUT - 90 - ps ILOSS Insertion Loss for B path with 75-Ohm load F req = 10MHz (VGA) -0.3 dBFreq = 100MHz (XGA) -0.33 Freq = 300MHz (UXGA) -0.4 Capacitance (TA = 25°C, f = 1MHz) Parameters Description Test Conditions Ty p. Units COFF Capacitance, Switch OFF 2.4 pF CON Switch Capacitance between BIN and BOUT, Switch ON 5.6 pF Dynamic Electrical Characteristics over Operating Range (TA=-40º to+85ºC, VDD3 =3.3V±10%, GND=0V, VDD5 = 5.0V±10%)

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. C ase_75//75: Reverse termination for the monitor is provided by a 75 Ohm resistor at the connector, as per the VESA VSIS specification. C ase_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 Application Case Supported 330Kohm +/-5% Case _150//75 200Kohm +/-5% Case _75//75 15-0090

www.pericom.com 07/08/15 PI3VST01 HPD signal Generator for VGA All trademarks are property of their respective owners. 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. 15-0090

www.pericom.com 07/08/15 PI3VST01 HPD signal Generator for VGA All trademarks are property of their respective owners. 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. 15-0090

www.pericom.com 07/08/15 PI3VST01 HPD signal Generator for VGA All trademarks are property of their respective owners.

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 14-0272 Packaging Mechanical: 8-Pin MSOP (U) Please check for the latest package information on the Pericom web site at www.pericom.com/packaging/ Pericom Semiconductor Corporation • 1-800-435-2336 15-0090