19-5819; Rev 0; 3/11 EVALUATION KIT AVAILABLE MAX14895E Enhanced VGA Port Protector General Description Benefits and Features The MAX14895E integrates level-translating buffers and features RED, GRN, and BLU (RGB) port protection for VGA signals. SSaves Power in Portable Applications Low Quiescent Supply Current: 430µA (typ) SEliminates Need for Costly External Components High-ESD Protection on SDA1, SCL1, SYNCH1, SYNCV1, RED, GRN, BLU, EN, VS ±15kV Human Body Model (HBM) ±8kV IEC 61000-4-2 Contact Discharge The device has horizontal sync (SYNCH_) and vertical sync (SYNCV_) translating buffers that convert low-level CMOS inputs from a graphics controller to meet full 5V, TTL-compatible outputs. Each output can drive Q10mA and meets the VESASM specification. In addition, the device translates the direct digital control (DDC) signals to a lower level that is safe for the graphics controller. SInnovative Design Enables a High Level of Integration for Performance Output Current-Limit Switch with Power-Off Protection Low Capacitance on RGB Ports (2.2pF typ) ±10mA Drive on SYNCH1, SYNCV1 The device features both EN and EN inputs, accepting active-high or active-low enable inputs. The device also switches and current limits the 5V supply to a VGA connector or monitor. SFully Integrated Solutions Saves Space in Portable Applications DDC Outputs have Internal Pullups 3mm x 3mm, 16-Pin TQFN Package The RED, GRN, and BLU terminals protect graphics controller outputs against electrostatic discharge (ESD) events. All eight outputs and EN have high-level ESD protection. The MAX14895E is specified over the extended -40NC to +85NC temperature range and is available in a 16-pin, 3mm x 3mm TQFN package with exposed pad. Ordering Information appears at end of data sheet. Applications Notebook Computers Servers Desktops Graphics Cards For related parts and recommended products to use with this part, refer to www.maxim-ic.com/MAX14895E.related. Typical Operating Circuit +5V 1µF VCC EN VS 1µF 2 VGA OUTPUTS 2 EN SYNCH0, SYNCV0 SYNCH1, SYNCV1 SDA0, SCL0 SDA1, SCL1 RED GRN BLU 2 2 VGA PORT MAX14895E GND VESA is a service mark of the Video Electronics Standards Association Corporation. ����������������������������������������������������������������� 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. MAX14895E Enhanced VGA Port Protector ABSOLUTE MAXIMUM RATINGS (Voltages referenced to GND.) VCC, VS, EN, SDA0, SCL0.......................................-0.3V to +6V SDA1, SCL1................................................. -0.3V to (VS + 0.3V) EN, RED, GRN, BLU, SYNCH0, SYNCH1, SYNCV0, SYNCV1................. -0.3V to (VCC + 0.3V) Continuous Current through SDA_, SCL_........................ Q30mA Continuous Short-Circuit Current SYNCH1, SYNCV1...... Q20mA Continuous Power Dissipation (TA = +70NC) TQFN (derate 20.8mW/NC above +70NC)..................1667mW Operating Temperature Range........................... -40NC to +85NC Junction Temperature......................................................+150NC Storage Temperature Range............................. -65NC to +150NC Lead Temperature (soldering, 10s).................................+300NC Soldering Temperature (reflow).......................................+260NC 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. PACKAGE THERMAL CHARACTERISTICS (Note 1) TQFN Junction-to-Ambient Thermal Resistance (BJA)...........48NC/W Junction-to-Case Thermal Resistance (BJC)..................7NC/W Note 1: 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. ELECTRICAL CHARACTERISTICS (VCC = +4.75V to +5.25V, TA = -40NC to +85NC, unless otherwise noted. Typical values are at VCC = +5V, TA = +25NC.) (Note 2) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS 5.25 V 800 FA 8 FA 4.3 V POWER SUPPLY Power-Supply Range VCC 4.75 Quiescent Supply Current IQ EN = VCC, EN = GND, SYNCH0 = SYNCV0 = GND, SDA0 = SCL0 = unconnected Shutdown Supply Current ISHDN EN = GND, EN = VCC, SYNCH0 = SYNCV0 = GND, SDA0 = SCL0 = unconnected Undervoltage Lockout Threshold VUVLO VCC rising 430 Undervoltage Lockout Hysteresis Internal Logic Supply Voltage 0.1 VL V VCC = +4.75V to +5.25V, SDA1/SCL1 = unconnected, measure SDA0/SCL0 1.6 2.9 VCC = +4.75V to +5.25V, SDA0/SCL0 = 200kI to GND, measure SDA0/SCL0, SDA1/SCL1 = unconnected 1.6 2.8 V RED, GRN, BLU RED, GRN, BLU Capacitance COUT RED, GRN, BLU Leakage Current f = 1MHz, VRED, GRN, BLU = 1VP-P 2.2 -1 pF +1 FA SYNCH0, SYNCV0, EN, EN Input Logic-High VIH Input Logic-Low VIL 2.0 V 0.8 V ����������������������������������������������������������������� Maxim Integrated Products 2 *The parametric values (min, typ, max limits) shown in the Electrical Characteristics table supersede values quoted elsewhere in this data sheet. MAX14895E Enhanced VGA Port Protector ELECTRICAL CHARACTERISTICS* (continued) (VCC = +4.75V to +5.25V, TA = -40NC to +85NC, unless otherwise noted. Typical values are at VCC = +5V, TA = +25NC.) (Note 2) PARAMETER SYMBOL CONDITIONS MIN MAX UNITS -1 +1 FA 800 kI SYNCH0, SYNCV0 Leakage Current SYNCH0/SYNCV0 = GND or VCC EN, EN Input Resistance EN = VCC, EN = GND 200 2.4 TYP SYNCH1, SYNCV1 Output Logic-High VOH VCC = +4.75V, source 10mA Output Logic-Low VOL VCC = +4.75V, sink 10mA V 0.5 V Rising Time tR RL = 2.2kI, CL = 10pF, 10% to 90% of VCC (Note 3) 4 ns Falling Time tF RL = 2.2kI, CL = 10pF, 90% to 10% of VCC (Note 3) 4 ns Propagation Delay tPD RL = 2.2kI, CL = 10pF, EN = VCC, EN = GND (Figure 1) 16 ns Enable Time tEN RL = 2.2kI, CL = 10pF, VSYNCH1, VSYNCV1 = +4.75V (Figure 1) 17 Fs RON VSDA0 = VSCL0 = 0.5V, ILOAD = 10mA SDA_, SCL_ (DDC) On-Resistance 55 I SDA0, SCL0 Off-Leakage Current EN = GND, EN = VCC, SDA0 = SCL0 = VCC, SDA1 = SCL1 = GND -1 +1 FA SDA1, SCL1 Reverse-Leakage Current VCC = 0V, VS = +5.25V, VSDA1 = VSCL1 = +5.25V -10 +10 FA VCC = +4.75V, SDA0 = SCL0 = unconnected, EN = VCC , EN = GND, ILOAD = 100FA 1.25 4.0 kI SDA1, SCL1 Pullup Resistor RPULLUP 2.5 VS OUTPUT Forward Voltage Drop ILOAD = 60mA, VCC = 5V Reverse-Leakage Current VCC = 0V, VS = 5.25V Current Limit ILIM Discharge Resistor RVS 200 ILOAD = 1mA 300 0.25 V 10 FA 600 mA 500 I THERMAL SHUTDOWN Thermal Shutdown Threshold +150 NC Thermal Shutdown Hysteresis 10 NC HBM ±15 kV IEC 61000-4-2 Contact ±8 kV ESD PROTECTION SDA1, SCL1, SYNCH1, SYNCV1, RED, GRN, BLU, EN, VS Note 2: All devices are 100% production tested at TA = +25NC. Limits over the operating temperature range are guaranteed by design and not production tested. Note 3: Guaranteed by design. ����������������������������������������������������������������� Maxim Integrated Products 3 *The parametric values (min, typ, max limits) shown in the Electrical Characteristics table supersede values quoted elsewhere in this data sheet. MAX14895E Enhanced VGA Port Protector 2.4V VSYNCH0/VSYNCV0 50% 50% 0V OUTPUT HIGH VSYNCH1/VSYNCV1 50% 50% OUTPUT LOW tPHL tPLH tPD = MAX(tPLH, tPHL) 2.4V VEN 50% 0V 2.4V VEN 50% 0V OUTPUT HIGH VSYNCH1/VSYNCV1 50% OUTPUT LOW tEN Figure 1. Timing Diagram ����������������������������������������������������������������� Maxim Integrated Products 4 MAX14895E Enhanced VGA Port Protector Typical Operating Characteristics (VCC = +5V, TA = +25NC, unless otherwise noted.) SDA0, SCL0 ARE INTERCHANGEABLE 70 5.8 50 40 TA = +25°C 30 TA = +85°C 20 5.2 5.0 4.8 4.6 4.2 TA = -40°C 4.0 0 0.5 5.4 4.4 10 0 IOUT = 8mA 5.6 OUTPUT VOLTAGE (V) 60 1.0 1.5 2.0 2.5 -40 3.0 -15 10 35 60 85 TEMPERATURE (°C) VSDA0 (V) 1.0 0.9 MAX14895E toc03 HV BUFFER OUTPUT-VOLTAGE LOW vs. TEMPERATURE IOUT = 8mA 0.8 OUTPUT VOLTAGE (V) RON (Ω) 6.0 MAX14895E toc01 80 MAX14895E toc02 HV BUFFER OUTPUT-VOLTAGE HIGH vs. TEMPERATURE ON-RESISTANCE vs. SDA0 VOLTAGE 0.7 0.6 0.5 0.4 0.3 0.2 0.1 0 -40 -15 10 35 60 85 TEMPERATURE (°C) ����������������������������������������������������������������� Maxim Integrated Products 5 MAX14895E Enhanced VGA Port Protector SYNCH0 SCL1 SCL0 TOP VIEW SYNCH1 Pin Configuration 12 11 10 9 SYNCV0 13 SYNCV1 14 MAX14895E VCC 15 *EP 3 4 GND 1 RED 2 BLU + GRN EN 16 8 SDA1 7 SDA0 6 EN 5 VS TQFN (3mm x 3mm) *CONNECT EP TO GND. Pin Description PIN NAME 1 RED High-ESD Protection Diodes for RGB Signals FUNCTION 2 GRN High-ESD Protection Diodes for RGB Signals 3 BLU High-ESD Protection Diodes for RGB Signals 4 GND Ground 5 VS Supply Voltage Output with Current-Limit Switch. VS provides a current-limited voltage from VCC when the device is enabled. Bypass VS to GND with a 1FF or larger ceramic capacitor as close as possible to the device. 6 EN Active-Low Enable Input. Drive EN high and EN low to disable the device. EN is weakly pulled up internally. 7 SDA0 DDC Data Input from Graphics Controller 8 SDA1 DDC Data Output to VGA Monitor. Internally pulled up to VCC. 9 SCL0 DDC Clock Input from Graphics Controller 10 SCL1 11 SYNCH0 DDC Clock Output to VGA Monitor. Internally pulled up to VCC. Horizontal Sync Input 12 SYNCH1 Horizontal Sync Output 13 SYNCV0 Vertical Sync Input 14 SYNCV1 Vertical Sync Output 15 VCC Supply Voltage Input. Apply a voltage between +4.75V and +5.25V to VCC to power the device. Bypass VCC to GND with a 1FF or larger ceramic capacitor as close as possible to the device. 16 EN Active-High Enable Input. Drive EN low and EN high to disable the device. EN is weakly pulled down internally. — EP Exposed Pad. Connect EP to GND. For enhanced thermal dissipation, connect EP to a large ground plane. Do not use EP as the only ground connection. ����������������������������������������������������������������� Maxim Integrated Products 6 MAX14895E Enhanced VGA Port Protector Functional Diagram/Truth Table VCC THERMAL SHUTDOWN EN MAX14895E CURRENT-LIMIT SWITCH LOGIC EN VS SDA/SCL PULLUP RESISTOR SWITCHES HIGH ESD RPULLUP RVS HIGH ESD VS PULLUP-TO-GND SWITCHES RPULLUP SDA0 SDA1 HIGH ESD I2C LEVEL SHIFTER SCL1 SCL0 HIGH ESD SYNCH0 SYNCH1 HIGH ESD SYNCV0 SYNCV1 HIGH ESD RED GRN HIGH ESD BLU HIGH ESD HIGH ESD GND EN EN 0 0 DEVICE LOGIC Enable 0 1 Disable 1 0 Enable 1 1 Enable DEVICE LOGIC/ EVENT SYNCH_/SYNCV_ BUFFER I2C LEVEL SHIFTER CURRENT-LIMIT SWITCH SDA/SCL PULLUP RESISTOR SWITCHES VS PULL-TO-GND SWITCH Enable No Overcurrent On On On On Off Enable Overcurrent On On Current Limit On Off Enable Overcurrent Thermal Shutdown Output 0V Off Off Off On Disable Output 0V Off Off Off On VCC = 0V Off Off Off Off Off ����������������������������������������������������������������� Maxim Integrated Products 7 MAX14895E Enhanced VGA Port Protector Detailed Description The MAX14895E integrates level-translating buffers and features RED, GRN, and BLU port protection for VGA signals. Horizontal and vertical synchronization (SYNCH0, SYNCV0) inputs feature level-shifting buffers to support low-voltage CMOS or standard TTL-compatible graphics controllers. Each output can drive Q10mA and meets VESA specifications. The device also features I2C level shifting using two nMOS devices. The device generates its own internal bias supply to clamp SCL0 and SDA0 to a safe level, removing the need for another external supply. The device also provides a current-limited VCC output with power-off protection. This output can be used to switch power to a VGA connector or the VGA interface of a monitor. Horizontal/Vertical Sync Level Shifter SYNCH0 and SYNCV0 are buffered to provide level shifting and drive capability to meet the VESA specification. The level-shifted outputs (SYNCH1, SYNCV1) are pulled low when EN is low and EN is high, or when the device is in thermal shutdown (see the Functional Diagram/ Truth Table). Logic-level outputs (VOL, VOH) are 5V TTLcompatible. These two buffers are identical and each can drive either the horizontal or the vertical synch signal. Display Data Channel Switches The device incorporates two nMOS switches for I2C level shifting. The SDA0 and SCL0 terminals are voltage clamped to a diode drop less than the internal VL voltage. Voltage clamping provides protection and compatibility with the SDA0 and SCL0 signals and low-voltage ASICs. When power is off (VCC = 0V), SDA1 and SCL1 are protected against reverse-leakage current up to VS = +5.25V. The SDA_ and SCL_ switches are identical, and each switch can be used to route SDA_ or SCL_ signals. RGB Ports The device includes three terminals for RED, GRN, and BLU signals. These terminals provide high-level ESD protection to the RGB lines while keeping the capacitance on the RGB lines to a minimum. The RED, GRN, BLU terminals are identical, and any of the three terminals can be used to protect red, green, or blue video signals. EN, EN The device has dual complementary EN and EN enable inputs and can accept either active-low or active-high enable signals. Pull EN low and EN high to place the device in shutdown (see the Functional Diagram/Truth Table). VS Output The device provides a current-limited voltage on VS when the part is enabled. VS is used as the pullup voltage for internal pullup resistors on SDA1 and SCL1, and can be used as an external supply. The internal pullup resistors from SDA1 and SCL1 to VS are active when the device is enabled, and are disabled when the device is in thermal shutdown (see the Functional Diagram/Truth Table). The VS supply includes an internal resistor to discharge the supply when the device is in thermal shutdown or is disabled (see the Functional Diagram/Truth Table). VS is current limited to prevent damage to host devices. When power is off (VCC = 0V), VS is protected against reverseleakage current up to VS = +5.25V. Thermal Shutdown Thermal-shutdown circuitry protects the device from overheating. The device enters thermal shutdown when the junction temperature exceeds +150NC (typ) and returns to normal operation when the temperature drops by approximately +10NC (typ) below the thermal-shutdown threshold. When the device is in thermal shutdown, both SYNCH1 and SYNCV1 are pulled down to ground, the I2C level shifters are disabled, the SDA1 and SCL1 pullups are off, and the VS discharge resistor is on (see the Functional Diagram/Truth Table). Applications Information Power-Supply Decoupling Bypass VCC and VS to ground with 1FF ceramic capacitors as close as possible to the device. PCB Layout High-speed switches such as the MAX14895E require proper PCB layout for optimum performance. Ensure that impedance-controlled PCB traces for high-speed signals are matched in length and are as short as possible. Connect the exposed pad to a solid ground plane. ESD Protection As with all Maxim devices, ESD protection structures are incorporated on all terminals to protect against electrostatic discharges encountered during handling and assembly. Additionally, the device is protected to Q15kV on the RED, GRN, BLU, EN, VS, SYNCH1, SYNCV1, SCL1, and SDA1 terminals by the HBM. For optimum ESD performance, bypass VCC to ground with a 1FF ceramic capacitor. ����������������������������������������������������������������� Maxim Integrated Products 8 MAX14895E Enhanced VGA Port Protector ESD protection can be tested in various ways. The RED, GRN, BLU, EN, VS, SYNCH1, SYNCV1, SCL1, and SDA1 terminals of the device are characterized for protection to the following limits: • Q15kV using the HBM • Q8kV using IEC 61000-4-2 Contact Discharge Human Body Model Figure 2 shows the HBM. Figure 3 shows the current waveform it generates when discharged into a lowimpedance state. 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. IEC 61000-4-2 The IEC 6100-4-2 standard covers ESD testing and performance of finished equipment. However, it does not specifically refer to integrated circuits. The device assists in designing equipment to meet IEC 61000-4-2 without the need for additional ESD protection components. The major difference between tests done using the HBM and IEC 61000-4-2 is higher peak current in IEC 610004-2 because series resistance is lower in the IEC 610004-2 model. Hence, the ESD withstand voltage measured to IEC 61000-4-2 is generally lower than that measured using the HBM. Figure 4 shows the IEC 61000-4-2 model, and Figure 5 shows the current waveform for the IEC 61000-4-2 ESD Contact Discharge test. RC 1MΩ RD 1.5kΩ RC 50MΩ TO 100MΩ RD 330Ω CHARGE-CURRENTLIMIT RESISTOR DISCHARGE RESISTANCE CHARGE-CURRENTLIMIT RESISTOR DISCHARGE RESISTANCE HIGHVOLTAGE DC SOURCE CS 100pF STORAGE CAPACITOR DEVICE UNDER TEST Figure 2. Human Body ESD Test Model CS 150pF STORAGE CAPACITOR DEVICE UNDER TEST Figure 4. IEC 61000-4-2 ESD Test Model IPEAK (AMPS) IPEAK (AMPS) Ir 100% 90% HIGHVOLTAGE DC SOURCE 100% 90% PEAK-TO-PEAK RINGING (NOT DRAWN TO SCALE) 36.8% 10% 0 0 TIME tRL tDL 10% t tR = 0.7ns TO 1ns 30ns 60ns Figure 3. Human Body Current Waveform Figure 5. IEC 61000-4-2 ESD Generator Current Waveform ����������������������������������������������������������������� Maxim Integrated Products 9 MAX14895E Enhanced VGA Port Protector Ordering Information PART TEMP RANGE PIN-PACKAGE MAX14895EETE+T -40NC to +85NC 16 TQFN-EP* +Denotes lead(Pb)-free/RoHS-compliant package. T = Tape and reel. *EP = Exposed pad. Chip Information 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. 16 TQFN-EP T1633+4 21-0136 90-0031 PROCESS: BiCMOS ���������������������������������������������������������������� Maxim Integrated Products 10 MAX14895E Enhanced VGA Port Protector Revision History REVISION NUMBER REVISION DATE 0 3/11 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. 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