MAX4885 19-0554 Rev 0 5/06 Complete VGA 1:2 or 2:1 Multiplexer General Description Features The MAX4885 integrates high-bandwidth analog +5V Single-Supply Operation switches and level-translating buffers to implement a Programmable Voltage Clamp for Open-Drain complete 1:2 or 2:1 multiplexer for VGA signals. The DDC Signals device provides switching for RGB, display data chan- nel (DDC), and horizontal and vertical synchronization Low 5 (typ) On-Resistance (R, G, B Signals) (HSYNC, VSYNC) signals. A low-noise charge pump Low 13pF (typ) On-Capacitance (R, G, B Signals) with internal capacitors provides a boosted gate-drive voltage to improve performance of the RGB switches. Break-Before-Make Switching Protects Against In the 1:2 multiplexer mode, HSYNC/VSYNC inputs fea- Circuit Shorts ture level-shifting buffers to support low-voltage CMOS 8kV HBM ESD Protection on Externally Routed or standard TTL-compatible graphics controllers. In the Pins 2:1 multiplexer mode, the output buffers for the HSYNC/VSYNC inputs are disabled, allowing bidirec- Low 300A Supply Current (Lower than 1A with tional signaling. In both modes, DDC signals are volt- Charge Pump Disabled) age-clamped to an external voltage to provide level Space-Saving, Lead-Free, 32-Pin (5mm x 5mm) translation and protection. The MAX4885 features a 5A shutdown mode and is ESD protected to 8kV TQFN Package Human Body Model (HBM) on externally routed pins. The MAX4885 is specified over the extended (-40C to +85C) temperature range, and is available in the 32- pin, 5mm x 5mm TQFN package. Ordering Information Applications PKG PART TEMP RANGE PIN-PACKAGE CODE Notebook Computers MAX4885ETJ+ -40C to +85C 32 TQFN-EP* T3255-4 Digital Projectors *EP = Exposed pad. Computer Monitors +Denotes lead-free package. Servers KVM Switches Pin Configuration Typical Operating Circuit TOP VIEW 24 23 22 21 20 19 18 17 +3.3V G1 25 16 G2 +5V 0.1F R1 26 15 R2 0.1F V V+ CL 27 14 DDCB2 DDCB1 28 13 DDCA2 MAX4885 DDCA1 3 3 R0, B0, G0 MAX4885 GRAPHICS R1, G1, B1 GND 29 12 GND 2 2 VGA CONTROLLER H1, V1 H0, V0 PORT 1 2 V+ 2 V+ 30 11 DDCA1, DDCB1 DDCA0, DDCB0 *EP 3 M 31 10 V CL SEL R2, G2, B2 DOCKING 2 VGA STATION M H2, V2 32 9 SEL EN PORT 2 2 EN DDCA2, DDCB2 12 3 45 6 7 8 GND TQFN *EXPOSED PADDLE CONNECTED TO GND 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. EVALUATION KIT AVAILABLE QP B1 R0 H1 G0 V1 B0 V+ H0 GND V0 V2 DDCA0 H2 DDCB0 B2Complete VGA 1:2 or 2:1 Multiplexer ABSOLUTE MAXIMUM RATINGS (All voltages referenced to GND.) Continuous Power Dissipation (T = +70C) A V , V .....................................................................-0.3V to +6V 32-Pin TQFN (derate 21.3mW/C above +70C) ........1702mW + CL R , G , B , DDCA , DDCB , SEL, M, Operating Temperature Range ...........................-40C to +85C EN, QP (Note 1) ...........................................-0.3V to V+ + 0.3V Storage Temperature Range .............................-65C to +150C H , V .......................................................................-0.3V to +6V Junction Temperature......................................................+150C Continuous Current Through RGB Switches ....................70mA Lead Temperature (soldering, 10s) .................................+300C Continuous Current Through HV, DDC Switches..........50mA Peak Current Through RGB Switches (pulsed at 1ms, 10% duty cycle).................................140mA Peak Current Through HV, DDC Switches (pulsed at 1ms, 10% duty cycle)..............................................................100mA Note 1: Signals exceeding V+ or GND are clamped by internal diodes. Limit forward-diode current to maximum current rating. 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 (V+ = +5.0V 10%, V = +3.3V 10%, T = T to T , QP = GND, unless otherwise noted. Typical values are at V+ = +5.0V, CL A MIN MAX V = +3.3V and T = +25C.) CL A PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Supply Voltage Range V+ 4.5 5.5 V Clamp Voltage Range V 2.7 V+ V CL QP = GND 0.3 0.5 mA V Quiescent Supply Current I V+ = +5.5V + + QP = V+ 1 A V Quiescent Supply Current I V = V+ = +5.5V 1 A CL CL CL V Shutdown Current I V+ = +5.5V, all digital inputs to V+ or GND 5A + +SHDN V = V+ = +5.5V, all digital inputs to V+ or CL V Shutdown Current I 1A CL CLSHDN GND RGB ANALOG SWITCHES QP = GND 5 7.5 0V < V < +2.5V, IN On-Resistance R ON I = -40mA IN QP = V+ 6 10 On-Resistance Matching R 0V < V < +2.5V, I = -40mA 0.5 1.5 ON IN IN On-Resistance Flatness R 0V < V < +2.5V, I = -40mA 0.02 0.75 FLAT(ON) IN IN Off-Leakage Current I R , G , B = 0V or +5.5V, EN = GND -1 +1 A L(OFF) On-Leakage Current I R , G , B = 0V or +5.5V, EN = V+ -1 +1 A L(ON) QP = GND 10 R , G , B = 0V, Charge Injection Q pC C = 1000pF L QP = V+ 8 HV MULTIPLEXER Input-Voltage Low V M = GND 0.8 V ILHV Input-Voltage High V M = GND 2.0 V IHHV High-Output Drive Current I V = V - 0.5V, M = GND -16 mA OHHV OUT + Low-Output Drive Current I V = +0.5V, M = GND +16 mA OLHV OUT On-Resistance R H = V = +2.5V, I = -40mA, M = V+ 15 ONHV IN Charge Injection Q H , V = 0V, M = V+, C = 1000pF 21 pC L 2 MAX4885