1 www.pericom.com 07/08/15 block diagram description te vga connector does not have a hot-plug pin to tell the sys- tem 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. pericoms 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. PI3VST01 allows notebook makers to shut of the vga dac when a monitor is not connected, thus saving 170 mw per dac. PI3VST01 dissipates only 0.66 mw. te monitor detection scheme within the PI3VST01 will not afect normal operation of the video driver. features ?? hot plug detect signal generator for vga connectors ?? generates hot plug output signal telling system when monitor is present or not ?? power supply, 3.3v and 5.0v ?? esd tolerance on pin 7 is up to +/-4kv contact per iec61000-4-2 specifcation ?? -3db bw of 1.7ghz (typ) ?? 4.75 ohm on resistance with 0.5 ohm fatness (typ) ?? low input/output capacitance (con = 4.5pf, typ) ?? packaging (pb-free and green): 8 -contact msop (u) PI3VST01 hpd signal generator for vga v v v logic control detector hpd_out bout bin vsync r ref 4 32 1 5 67 8 gnd bin vsync hpd_out bout rref dd5 v dd3 v pin configuration-u8 (top view) all trademarks are property of their respective owners. 15-0090
2 www.pericom.com 07/08/15 pinout table pin # pin name i/o ty pe description 1 gnd ground ground 2 v dd5 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 PI3VST01 hpd signal generator for vga all trademarks are property of their respective owners. 15-0090
3 www.pericom.com 07/08/15 absolute ratings ( above which the useful life may be impaired. for user guidelines, not tested) v dd3 (power supply)..........-0.5v to 4.0v v dd5 (power supply)..........................................-0.5v to 6v storage temperature........-55 o c to +150 o c note: stresses greater than those listed under maximum ratings may cause permanent damage to the device. tis 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 specifcation is not implied. exposure to absolute maximum rating conditions for extended periods may afect reliability. dc electrical characteristics for video switching over operating range (t a = C40c to +85c, v dd3 = 3.3v10%, v dd5 = 5.0v10%) parameters description test conditions min. ty p. max. units r on switch on-resistance, bin to bout v dd = min., 0v v input 1. 2v, i input = C40ma - 4.75 5.5 ohm r flat(on) on-resistance flatness, bin to bout v dd = min., v input @ 0v and 1. 2v, i input = C40ma - 0.5 1 v ih,vsync input high voltage, vsync 2.4 v v il,vsync input low voltage, vsync 0 0.5 v v ol,hpd_out output low voltage, hpd_out i ol =2ma 0 0.4 v i il input leakage current, bin v in = 0v -1 1 ua i ih input leakage current, bin v in = 3.6v -1 1 ua i ozl output leakage current, bout v out = 0v -1 1 ua i ozh output leakage current, bout v out = 3.6v -1 1 ua i ozh,hpd_out output leakage current, hpd_out v oz =v dd 1 ua parameters description min. ty p. max. units i dd3 current consumption for 3.3v rail, case 75//75 or 150//75 200 400 ua i dd5 current consumption for 5v rail, case 75//75 or 150//75 0.5 1 ua power supply characteristics (t a = C40c to +85c) PI3VST01 hpd signal generator for vga all trademarks are property of their respective owners. 15-0090
4 www.pericom.com 07/08/15 parameters description test conditions min. ty p. max. units oirr off isolation, bin to bout f = 250mhz - -46 - db bw bandwidth C3db, bin to bout - 2.0 - ghz t pd propagation delay, bin to bout - 90 - ps i loss insertion loss for b path with 75-ohm load f req = 10mhz (vga) -0.3 db freq = 100mhz (xga) -0.33 freq = 300mhz (uxga) -0.4 capacitance (t a = 25c, f = 1mhz) parameters description test conditions ty p. units c off capacitance, switch off 2.4 pf c on switch capacitance between bin and bout, switch on 5.6 pf dynamic electrical characteristics over operating range (t a =-40o to+85oc, v dd3 =3.3v10%, gnd=0v , v dd5 = 5 . 0 v10 % ) applications vga-dacs in chipsets as well as video chips (mxm, gpu, dp-to-vga, pcie, etc.) typically dissipate about 170 mw. te 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. tis hpd_out signal can be routed to the chipset, directly, or through an mpu, to turn of 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 ofers both automatic and manual monitor switching. vga termination PI3VST01 can support two diferent 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 specifcation. 2. 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 PI3VST01 hpd signal generator for vga all trademarks are property of their respective owners. 15-0090
5 www.pericom.com 07/08/15 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 specifcation, 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. te schematic below illustrates the recommended design for the 150//75 case. PI3VST01 hpd signal generator for vga all trademarks are property of their respective owners. 15-0090
6 www.pericom.com 07/08/15 te 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. PI3VST01 hpd signal generator for vga all trademarks are property of their respective owners. 15-0090
7 www.pericom.com 07/08/15 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 ? termal characteristics can be found on the company web site at www.pericom.com/packaging/ ? e = pb-free and green ? x sufx = 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 PI3VST01 hpd signal generator for vga all trademarks are property of their respective owners. 15-0090
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