19-6229; Rev 0; 3/12 EVALUATION KIT AVAILABLE MAX14984 Enhanced VGA Port Protector with Monitor Detection and Dual USB Power Switches General Description The MAX14984 is a complete VGA port protector with dual USB power switches. The device features all the circuitry required to detect the insertion and removal of a monitor and automatically connect the graphics controller when a monitor is detected. A switched 5V output provides up to 55mA to the VGA port in addition to normal VGA signals. The MAX14984 features a single active-low enable input to control two 5V USB switches. Each switch supplies 500mA of current with less than 250mV drop from VCC, and is protected against short-circuit faults. Two active-low fault outputs indicate when a fault condition is detected on either output. High-bandwidth analog switches exceed VESA rise/fall time requirements for the RGB channels. The horizontal and vertical synchronization (H/V) buffers shift logic levels to support +2.5V to +5.0V CMOS or TTL-compatible graphics controllers while meeting the VESA drive capability requirement of Q8mA. An internal 2.5V regulator and pullup resistors on the monitor side translate the DDC voltage levels to be compatible with low-voltage graphics controllers. The MAX14984 features high-ESD protection of Q8kV Human Body Model (HBM) on all VGA and USB outputs. The device is available in a 24-pin (4mm x 4mm) TQFN package and is specified over the -40NC to +85NC extended temperature range. Applications Benefits and Features S Design Flexibility Graphics Controller Port Is Protected when VCC = 0V External Pullup Resistors Match DDC Channel to Graphics Controller Supply Up to Two USB Ports Supported S High Level of Integration for Performance S5V Provides +5V at 55mA to VGA Port Internal Pullup Resistors on DDC Outputs to S5V Low 6pF (typ) RGB Capacitance 2.1ns (typ) tR /tF with 10pF, 2.2kI Load on Monitor-Side SYNC Signals Source and Sink 8mA While Meeting Speed Requirements High-ESD Protection on VGA and USB Outputs Q8kV Human Body Model (HBM) S Saves Space on Board Internal USB Switches Pass +5V at 500mA with 250mV (max) IR Drop Current Limited/Thermal Protection 4mm x 4mm, 24-Pin TQFN Package Typical Operating Circuit +3.3V +5V 1µF Servers Workstations Desktop PCs 3 2 GRAPHICS CONTROLLER Ordering Information appears at end of data sheet. 2 2 +3.3V R0, G0, B0 VCC R1, G1, B1 HSYNC1, VSYNC1 HSYNC0, VSYNC0 SCL0, SDA0 SCL1, SDA1 3 2 VGA PORT 2 S5V F1, F2 1µF ENU MAX14984 For related parts and recommended products to use with this part, refer to www.maxim-ic.com/MAX14984.related. USB1 1µF USB DEVICE MD USB2 ENV GND 1µF USB DEVICE ����������������������������������������������������������������� Maxim Integrated Products 1 For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com. MAX14984 Enhanced VGA Port Protector with Monitor Detection and Dual USB Power Switches ABSOLUTE MAXIMUM RATINGS (All voltages referenced to GND.) VCC, S5V, H0, V0, SDA0, SCL0, ENU, ENV, SDA1, SCL1, USB1, USB2, MD, F1, F2 (Note 1)............-0.3V to +6V R0, G0, B0, R1, G1, B1, H1, V1...................-0.3V to VCC + 0.3V Continuous Current Out of USB1, USB2...........................500mA Continuous Current Out of S5V...........................................60mA Continuous Current Through all I/O Pins......................... Q50mA Peak Current Through RGB, DDC Switches (1ms Pulse, 10% Duty Cycle)..................................... Q100mA Continuous Power Dissipation (TA = +70C) TQFN (derate 27.8mW/NC above +70C).................2222.2mW Operating Temperature Range........................... -40NC to +85NC Junction Temperature......................................................+150NC Storage Temperature Range............................. -65NC to +150NC Lead Temperature (soldering, 10s).................................+300NC Soldering Temperature (reflow).......................................+260NC PACKAGE THERMAL CHARACTERISTICS (Note 2) TQFN Junction-to-Ambient Thermal Resistance (qJA)...........36°C/W Junction-to-Case Resistance (qJA)....................................3°C/W Note 1:When F1 and F2 are connected to a voltage higher than VCC, some current will be sinked (see the Detailed Description). Note 2: Package thermal resistances were obtained using the method described in JEDEC specification JESD51-7, using a fourlayer board. For detailed information on package thermal considerations, refer to www.maxim-ic.com/thermal-tutorial. Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. ELECTRICAL CHARACTERISTICS (VCC = 5.0V Q 5%, TA = -40NC to +85NC, unless otherwise noted. Typical values are at VCC = 5.0V and TA = +25NC.) (Note 3) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNIT 5.25 V POWER SUPPLY Supply Voltage VCC VCC = +5.25V, VENV = VENU = 0V, SCL0 and SDA0 not connected 2.3 5 VCC = +5.25V, VENV = VENU = 0V, VSCL0 = VSDA0 = 0V 6.6 10 ISHDN VCC = +5.25V, VENV = VENU = VCC 29 100 FA VS5V IOUT = 55mA 135 300 mV 10 FA 500 mA Supply Current ICC Shutdown Supply Current 4.75 mA 5-VOLT SWITCH (S5V) Voltage Drop Reverse Leakage Current IL Current Limit VS5V = +5.25V, VCC = 0V, VENV = 0V ILIM 55 305 USB SWITCHES (USB1, USB2) Voltage Drop VUSB Continuous Load Current ILOAD 500 Current-Limit Threshold ILIM 0.5 1.0 A Current-Limit Blanking Period tBLANK 7.5 50 ms Output Rise Time Output Fall Time Turn-On Delay IOUT = 500mA (Note 4) RL = 10I, CL = 1FF, 10%–90%, Figure 1 11.6 tF RL = 10I, CL = 1FF, 90%–10%, Figure 1 25.2 Turn-Off Delay tOFF RL = 10I, CL = 1FF, to 10% of VOUT, Figure 1 RL = 10I, CL = 1FF, to 90% of VOUT, Figure 1 Reverse Leakage Current ILUSB VUSB = 5.25V, VCC = 0V, VENU = 0V mV mA tR tON Pulldown Resistance 250 Fs Fs 100 100 Fs 10 FA 1200 I Fs ����������������������������������������������������������������� Maxim Integrated Products 2 MAX14984 Enhanced VGA Port Protector with Monitor Detection and Dual USB Power Switches ELECTRICAL CHARACTERISTICS (continued) (VCC = 5.0V Q 5%, TA = -40NC to +85NC, unless otherwise noted. Typical values are at VCC = 5.0V and TA = +25NC.) (Note 3) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNIT DDC SWITCHES (SDA0, SCL0, SDA1, SCL1) SDA1/SCL1 Off-Leakage Current IOFF VENV = VCC, VSDA1 = VSCL1 = 0V or 5.25V SDA0/SCL0 Off-Leakage Current ILDDC VCC = 0V, 3.3kI pullup to +3.3V on SDA0 and SCL0 On-Resistance RONDDC -1 +1 FA 10 FA 7 VIN = +0.8V, IIN = Q10mA I LOGIC INPUTS (H0, V0, ENV, ENU) Input Logic-Low VIL Input Logic-High VIH Input Leakage Current Input Hysteresis (H0, V0) IL 0.8 V 2.0 VIN = 0V or 5.25V -1 VHYST +1 100 V FA mV PUSH-PULL LOGIC OUTPUTS (H1, V1) Output Logic-Low VOL Output Logic-High VOH ISINK = 8mA, VCC = +4.75V ISOURCE = 8mA, VCC = +4.75V Rise/Fall Time tR, tF 10% to 90%, RL = 2.2kI, CL = 10pF 0.5 2.4 V V 2.1 ns OPEN-DRAIN LOGIC OUTPUTS (F1, F2, MD) Output Leakage Current ILKG Output not asserted, VIN = 5.25V Output Logic-Low VOL ISINK = 1mA 1 FA 0.3 V RGB ANALOG SWITCHES (R0, G0, B0, R1, G1, B1) Bandwidth fMAX RS = RL = 50I On-Loss ILOSS f = 50MHz, RS = RL = 50I, 0V P VIN P +0.7V, Figure 2 On-Resistance RON On-Resistance Matching DRON On-Resistance Flatness RFLAT(ON) VIN = +0.7V, IIN = Q10mA 0V P VIN P +0.7V, IIN = Q10mA, same device 1000 MHz 0.4 dB 5 0.25 8 I 1 I 1 I On-Capacitance CON 0V P VIN P +0.7V, IIN = Q10mA f = 1MHz, switches enabled 6 pF Off-Capacitance COFF f = 1MHz, switches disabled 2 pF High-ESD Pins ESD Protection Human Body Model (Note 5) Q8 kV All Other Pins ESD Protection Human Body Model (Note 6) Q2 kV TSHDN +155 NC TSHDN_ 25 NC PROTECTION SPECIFICATIONS Thermal-Shutdown Threshold Thermal-Shutdown Hysteresis Note Note Note Note HYS 3: All units are production tested at TA = +25NC. Specifications over temperature are guaranteed by design. 4:tBLANK is the period between detecting an overcurrent condition and the fault output asserting. 5: See the Pin Description section for the ESD status of each pin. 6: Terminal tested vs. GND. Apply 1FF-bypass capacitors on VCC, USB1, USB2, and S5V. ����������������������������������������������������������������� Maxim Integrated Products 3 MAX14984 Enhanced VGA Port Protector with Monitor Detection and Dual USB Power Switches Test Circuits/Timing Diagrams 3.3V VENU 0V tOFF 5V tON tF tR 90% 90% VUSB1, VUSB2 10% 0V 10% Figure 1. Timing Diagram for USB Switch Parameters +5V 1µF 0V ENV NETWORK ANALYZER VCC R0, G0, B0 50I VIN 50I V ON-LOSS = 20log OUT VIN MAX14984 R1, G1, B1 VOUT MEAS GND 50I REF 50I MEASUREMENTS ARE STANDARDIZED AGAINST SHORTS AT IC TERMINALS. ON-LOSS IS MEASURED BETWEEN R0 AND R1 ON EACH SWITCH. SIGNAL DIRECTION THROUGH IS REVERSED; WORST VALUES ARE RECORDED. Figure 2. On-Loss ����������������������������������������������������������������� Maxim Integrated Products 4 MAX14984 Enhanced VGA Port Protector with Monitor Detection and Dual USB Power Switches Typical Operating Characteristics (VCC = +5.0V, TA = +25NC, unless otherwise noted) ISDA0 = 10mA 40 30 20 TA = +85°C IR0 = 10mA 40 RON (I) 30 20 TA = +25°C TA = +85°C TA = +25°C 10 10 TA = -40°C 0 0.5 1.0 1.5 0 2.0 1 2 3 4 VSDA0 (V) VR0 (V) FREQUENCY RESPONSE HSYNC/VSYNC OUTPUT VOLTAGE vs. TEMPERATURE 5 MAX14984 toc03 0 -1 -2 ISOURCE /ISINK = 8mA VOH 4 5 -3 -4 VOH /VOL (V) FREQUENCY RESPONSE (dB) TA = -40°C 0 0 MAX14984 toc04 RON (I) 50 MAX14984 toc01 50 MAX14984 toc02 RGB ON-RESISTANCE vs. ANALOG SIGNAL VOLTAGE DDC ON-RESISTANCE vs. ANALOG SIGNAL VOLTAGE -5 -6 3 2 -7 -8 1 -9 VOL GO TO G1 -10 1 10 100 FREQUENCY (MHz) 1k 0 -40 -15 10 35 60 85 TA (°C) ����������������������������������������������������������������� Maxim Integrated Products 5 MAX14984 Enhanced VGA Port Protector with Monitor Detection and Dual USB Power Switches Pin Configuration R1 G1 B1 H1 V1 S5V TOP VIEW 18 17 16 15 14 13 SDA1 19 12 ENU SCL1 20 11 ENV VCC 21 10 USB2 9 USB1 8 F2 7 F1 MAX14984 VCC 22 SDA0 23 *EP/GND + 1 2 3 4 5 6 R0 G0 B0 H0 V0 MD SCL0 24 TQFN (4mm x 4mm) *CONNECT THE EXPOSED PAD (EP/GND) TO THE GROUND PLANE. Pin Description PIN NAME 1 R0 RGB Analog Input FUNCTION Standard ESD 2 G0 RGB Analog Input Standard 3 B0 RGB Analog Input Standard 4 H0 Horizontal Sync Input Standard 5 V0 Vertical Sync Input Standard 6 MD Monitor Detect Output. MD is an active-low, open-drain output. Standard 7 F1 Fault Output 1. F1 is an active-low, open-drain output that asserts when a fault condition is detected on USB1. Standard 8 F2 Fault Output 2. F2 is an active-low, open-drain output that asserts when a fault condition is detected on USB2. Standard 9 USB1 5V USB Power Output 1. USB1 is internally pulled down when not enabled. High 10 USB2 5V USB Power Output 2. USB2 is internally pulled down when not enabled. High 11 ENV Video Enable Input. Drive ENV low to connect the VGA signals to the VGA port. High 12 ENU USB Enable Input. Drive ENU low to enable the USB power-supply outputs. High ����������������������������������������������������������������� Maxim Integrated Products 6 MAX14984 Enhanced VGA Port Protector with Monitor Detection and Dual USB Power Switches Pin Description (continued) PIN NAME 13 S5V FUNCTION ESD Switched 5V Output. S5V is connected when ENV is low and is internally pulled down when not connected. High 14 V1 Vertical Sync Output High 15 H1 Horizontal Sync Output High 16 B1 RGB Analog Output High 17 G1 RGB Analog Output High 18 R1 RGB Analog Output High 19 SDA1 DDC Input/Output. SDA1 has an internal 2.5kI pullup resistor to S5V High 20 SCL1 DDC Input/Output. SCL1 has an internal 2.5kI pullup resistor to S5V High 21, 22 VCC Supply Voltage. VCC = 5.0V Q5%. Bypass VCC to GND with a 1FF or larger ceramic capacitor as close as possible to VCC. Standard 23 SDA0 DDC Input/Output Standard 24 SCL0 DDC Input/Output Standard — EP/GND Exposed Pad. The exposed pad is the ground connection for the device. Connect EP/GND to the ground plane. — ����������������������������������������������������������������� Maxim Integrated Products 7 MAX14984 Enhanced VGA Port Protector with Monitor Detection and Dual USB Power Switches Functional Diagram VCC S5V INTERNAL VL 2.5V REGULATOR MAX14984 200I R0 R1 G0 G1 B0 B1 2.5kI S5V SDA1 SDA0 2.5kI SCL1 SCL0 H0 H1 V0 V1 F2 VCC USB1 F1 MONITOR DETECTION 1kI MD USB2 THERMAL PROTECTION ENU ENV 1kI CONTROL LOGIC GND ����������������������������������������������������������������� Maxim Integrated Products 8 MAX14984 Enhanced VGA Port Protector with Monitor Detection and Dual USB Power Switches Detailed Description The MAX14984 integrates high-bandwidth analog switches and level-translating buffers with current-limited power switches to implement a VGA port protector. The device provides switching for red-green-blue (RGB) signals, horizontal and vertical synchronization (H/V) pulses, display data channel (DDC) signals, and 5V power supplies. The power switches provide +5V power with current limiting and reverse voltage protection to the VGA port and up to two USB ports. The device uses a simplified power-supply interface that operates from a single +5V supply. An internal 2.5V regulator limits the voltage passed by the DDC switches to provide compatibility with low-voltage graphics controllers. The device features two enable inputs, a monitor detection output, and two fault outputs. ENV can be connected to MD to automatically connect the graphics signal when a monitor is inserted. The fault outputs signal when a fault condition is detected on either of the USB power outputs and they are enabled by ENU. 5V Power Switch (S5V) Two active-low fault outputs, F1 and F2, assert when a fault is detected on USB1 or USB2, respectively. Two fault conditions can be detected: short circuit to GND and overcurrent draw from the USB port. The switches are protected against reverse current into VCC while ENU is high, but this condition is not detected by F1 and F2. Current-limiting and thermal-shutdown circuitry protects the device in the presence of any fault. A blanking period is built in to F1 and F2 that delays assertion until the current limit has been reached for at least tBLANK. In addition, an internal 1kI pulldown resistor is connected on each USB output when it is disabled. The F1 and F2 outputs are tolerant to external voltages of up to 6V. The MAX14984 limits the current into them to 600FA. RGB Switches The MAX14984 provides three single-pole/single-throw (SPST) high-bandwidth switches to connect the standard VGA R, G, and B signals from the graphics controller to the VGA port. The R, G, B analog switches are identical, and any of the three switches can be used to route red, green, or blue video signals. The MAX14984 provides a switched +5V output in addition to the regular VGA signals (S5V). This output can supply 55mA with less than 300mV drop from VCC. The S5V output tolerates +5V while turned off or when VCC is not present. The RGB switches are connected when ENV is low. The power switches are protected against overcurrent and overtemperature faults. The device limits current supplied to the monitor side to 300mA (typ). Thermal protection circuitry shuts off the switch when the temperature exceeds +155NC. The device is re-enabled once the temperature has fallen to below +130NC. H1 and V1 are enabled when ENV is low and high impedance when ENV is high. The H and V channels are not interchangeable. S5V is connected whenever ENV is low and has a 200I (typ) pulldown resistor to discharge filter capacitors when the switch is off. USB Switches and F1/F2 Outputs The MAX14984 features two switches that provide power for up to two USB connectors. One enable input, ENU, controls both switches simultaneously. Each switch can provide up to 500mA while only dropping 250mV from VCC. Horizontal/Vertical Sync Buffer The H/V signals are buffered to provide level shifting and drive capability to meet the VESA specification. Display Data Channel Switches (SDA_, SCL_) The MAX14984 provides two voltage-limited SPST switches to connect DDC signals (SDA_, SCL_). These switches limit the voltage that can be passed through to the graphics controller to less than 2.5V. Internal pullup resistors on the monitor side of the switches translate the graphics controller signals to 5V compatible logic. Connect pullup resistors on SCL0 and SDA0 to define the logic level of the graphics controller. The SDA_ and SCL_ switches are connected when ENV is low and are identical; either switch can be used to route SDA or SCL I2C signals. ����������������������������������������������������������������� Maxim Integrated Products 9 MAX14984 Enhanced VGA Port Protector with Monitor Detection and Dual USB Power Switches Monitor Detection and Automatic Switching The MAX14984 detects monitor insertion/removal events by measuring the voltage on B1. The monitor detection circuitry always correctly indicates the presence of a monitor as long as V0 is not high impedance. The voltage measurement is only sampled between synchronization pulses on V0 from the controller when a monitor is inserted to ensure that the video signal is not interrupted while promptly detecting a removal. The device automatically connects the graphics controller to the monitor when it is plugged in if configured in automatic mode. To configure automatic mode, connect MD to ENV and add a pullup resistor. Applications Information Compatibility with Low-Voltage Graphics Controllers The MAX14984 provides the level shifting necessary to drive a standard VGA port using any graphics controller. Internal buffers drive the H and V signals to VGA standard TTL levels. The DDC switches provide level shifting by limiting signal levels that can be passed through the DDC switches to less than 2.5V. Add pullup resistors from the DDC lines to the graphics controller supply to set the logic level on the SDA0/SCL0 side. Power-Supply Decoupling PC Board Layout High-speed switches such as the MAX14984 require proper PCB layout for optimum performance. Ensure that impedance-controlled PCB traces for high-speed signals are matched in length and as short as possible. Connect the exposed pad to a solid ground plane. High ESD Protection Electrostatic Discharge (ESD) protection structures are incorporated on all pins to protect against electrostatic discharges up to Q2kV Human Body Model (HBM) encountered during handling and assembly. All VGA and USB outputs are further protected against ESD up to Q8kV (HBM) without damage (see the Pin Description). The ESD structures withstand high ESD both in normal operation and when the device is powered down. After an ESD event, the MAX14984 continues to function without latchup. ESD Test Conditions ESD performance depends on a variety of conditions. Contact Maxim for a reliability report that documents test setup, test methodology, and test results. Human Body Model Figure 3 shows the Human Body Model. Figure 4 shows the current waveform it generates when discharged into a low impedance. This model consists of a 100pF capacitor charged to the ESD voltage of interest that is then discharged into the device through a 1.5kI resistor. Bypass VCC to ground with a 1FF or larger ceramic capacitor as close to the device as possible. HIGHVOLTAGE DC SOURCE RC 1MΩ RD 1.5kΩ CHARGE-CURRENTLIMIT RESISTOR DISCHARGE RESISTANCE CS 100pF STORAGE CAPACITOR Figure 3. Human Body ESD Test Model IPEAK (AMPS) Ir 100% 90% DEVICE UNDER TEST PEAK-TO-PEAK RINGING (NOT DRAWN TO SCALE) 36.8% 10% 0 0 TIME tRL tDL Figure 4. Human Body Current Waveform ���������������������������������������������������������������� Maxim Integrated Products 10 MAX14984 Enhanced VGA Port Protector with Monitor Detection and Dual USB Power Switches Ordering Information PART TEMP RANGE PIN-PACKAGE MAX14984ETG+ -40NC to +85NC 24 TQFN-EP* +Denotes a lead(Pb)-free/RoHS-compliant package. *EP = Exposed paddle. Chip Information PROCESS: BiCMOS Package Information For the latest package outline information and land patterns (footprints), go to www.maxim-ic.com/packages. Note that a “+”, “#”, or “-” in the package code indicates RoHS status only. Package drawings may show a different suffix character, but the drawing pertains to the package regardless of RoHS status. PACKAGE TYPE PACKAGE CODE OUTLINE NO. LAND PATTERN NO. 24 TQFN-EP T2444+3 21-0139 90-0021 ���������������������������������������������������������������� Maxim Integrated Products 11 MAX14984 Enhanced VGA Port Protector with Monitor Detection and Dual USB Power Switches Revision History REVISION NUMBER REVISION DATE 0 3/12 DESCRIPTION Initial release PAGES CHANGED — Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time. The parametric values (min and max limits) shown in the Electrical Characteristics table are guaranteed. Other parametric values quoted in this data sheet are provided for guidance. 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