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| (R) ISL54103 Data Sheet June 22, 2006 FN6303.1 PRELIMINARY DDC Accelerator (DDCA) The ISL54103 DDC Accelerator (DDCA) is a dual active pull-up bus terminator designed to improve data transmission speed on the DDC 2-wire serial bus interfaces. The DDCA detects rising input transitions with two internal voltage references and two comparators per channel. After the voltage on a data line crosses the first threshold (VTRIPL), the boost pull-up current source is activated to speed transition. After the voltage crosses the second threshold (VTRIPH), the boost pull-up current source is de-activated, leaving an active pull-up current of 275A on the line. When both channels are HIGH, the pull-up current for both lines is reduced to 100A to save power. Internal logic ensures that the active and boost pull-up current sources are not activated during downward transitions. The level for VTRIPH is controlled by a bandgap voltage referred to VDD. This feature makes the switching behavior invariant for all power supply voltages between 2.7V and 5.5V. A noise filter on each channel prevents the circuit from responding to input transitions that do not exceed a voltage-time threshold. To activate the boost circuit, the input must exceed VTRIPL by 100Vns (typical) (See Figure 10). The DDCA permits operation of the bus at frequencies up to 100kHz, despite the capacitive loads of multiple devices and/or long PC board traces. Enhanced ESD protection on the accelerator pins are guaranteed to withstand 8kV ESD (HBM) events. The DDC Accelerator provides an essential function in DDC applications because of distributed capacitance of the DDC wires in long video cables. By incorporating DDCA, systems using DDC can reliably increase their bus load, allowing longer cables, without the risk of data corruption. Features * Active Termination for DDC Lines * Enhances System Bus Signal Rise Time * More Reliable HDCP Performance In Video Multiplexers and Cable Extenders * Increases Maximum Cable Length While Guaranteeing Data Integrity * 2.2mA Current Boost on Low to High Transitions * 8kV ESD Protection on SDA and SCL Pins * Wide Operating Voltage Range: 2.7V to 5.5V * Small Package - 5 Ld SOT-23 * Pb-free Plus Anneal Available (RoHS Compliant) Target Applications * Video Multiplexers * Video Cable Extenders * Video Distribution Amplifiers * Televisions * Computer Monitors * Projectors Pinout ISL54103 (5 LD SOT-23) TOP VIEW VDD GND N.C. 5 1 2 3 DDC1 4 DDC2 Ordering Information PART NUMBER ISL54103IHZ-T7 (Note) TAPE & REEL 7" TEMP RANGE (C) -40 to 85 PACKAGE 5 Ld SOT-23 (Pb-free) NOTE: Intersil Pb-free plus anneal products employ special Pb-free material sets; molding compounds/die attach materials and 100% matte tin plate termination finish, which are RoHS compliant and compatible with both SnPb and Pb-free soldering operations. Intersil Pb-free products are MSL classified at Pb-free peak reflow temperatures that meet or exceed the Pb-free requirements of IPC/JEDEC J STD-020. 1 CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures. 1-888-INTERSIL or 1-888-468-3774 | Intersil (and design) is a registered trademark of Intersil Americas Inc. Copyright Intersil Americas Inc. 2006. All Rights Reserved All other trademarks mentioned are the property of their respective owners. ISL54103 Pin Descriptions SOT-23 1 2 3 4 5 SYMBOL VDD GND N.C. DDC1 DDC2 Supply Voltage Ground No Connect Active Pull-Up for DDC Signal Active Pull-Up for DDC Signal DESCRIPTION System Diagram ISL54103 Video Source PC, DVD, Set Top Box, etc. VGA, DVI, HDMI VDD DDC1 DDC2 GND Display Device TV, Monitor, A/V Receiver, etc. VGA, DVI, HDMI SDA SCL BUS SIGNALS IC Block Diagram VDD 1.825mA 175A 100A VTRIPH= VDD-0.5V DDC1 VTRIPL= 0.75V VTRIPH= VDD-0.5V DDC2 VTRIPL= 8kV ESD Protection 8kV ESD Protection GND 0.75V Control + Control + 2 + + 1.825mA 175A 100A VDD FN6303.1 June 22, 2006 ISL54103 Absolute Maximum Ratings Supply Voltage Range . . . . . . . . . . . . . . . . . . . . . . . . . . . -1V to 6.5V Operating Junction Temperature . . . . . . . . . . . . . . . . . . . . . . +135C Storage Temperature Range . . . . . . . . . . . . . . . . . .-65C to +150C Voltage on Pins . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3V to VDD+0.3V Lead Temperature (soldering, 10s) . . . . . . . . . . . . . . . . . . . . . 300C ESD Min Other Pins (HBM) . . . . . . . . . . . . . . . . . . . . . . . . . . . .>2kV ESD DDC1 and DDC2 Pins (HBM) . . . . . . . . . . . . . . . . . . . . . .>8kV Recommended Operating Conditions Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .-40C to +85C Supply Voltage. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2.7V to 5.5V CAUTION: Absolute Maximum Ratings indicate limits beyond which permanent damage to the device and impaired reliability may occur. These are stress ratings provided for information only and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of this specification are not implied. For guaranteed specifications and test conditions, see Electrical Specifications. The guaranteed specifications apply only for the test conditions listed. Some performance characteristics may degrade when the device is not operated under the listed test conditions. Electrical Specifications SYMBOL Over all operating conditions unless otherwise specified, Typical values are measured at VDD = 3.3V and TA = +25C CONDITIONS MIN TYP MAX UNIT PARAMETER ANALOG PARAMETERS VDD Supply Voltage Range 2.7 0.05 DDC1 = DDC2 = Open DDC1 = DDC2 = VDD - 1.0V DDC1 = GND; DDC2 = Open DDC1 = Open; DDC2 = GND Boost Pull-Up Current (Figure 2) VTRIPL < DDC1 < VTRIPH, DDC2 = Open VTRIPL < DDC2 < VTRIPH, DDC1 = Open Input Voltage Threshold Low Input Voltage Threshold High DDC Max Frequency Noise Spike Suppression (Note Figure 1) (Figure 10) 20 125 125 1.6 1.6 0.65 VDD - 0.60 80 80 275 275 2.2 2.2 0.75 VDD - 0.50 0.85 VDD - 0.40 100 5.5 50 100 125 350 350 V V/ms A A A A mA mA V V kHz V-ns VDD RAMP VDD Ramp Rate IDD IOUT_SB IOUT_A1 IOUT_A2 IOUT_B1 IOUT_B2 VTRIPL VTRIPH fMAX NSS NOTES: Supply Current Standby Pull-Up Current Active Pull-Up Current 1. Measured as area under triangular waveform above VTRIPL, with time as base and VIN as height (See Figure 10). 3 FN6303.1 June 22, 2006 ISL54103 Typical Performance Curves 370 ACTIVE PULL-UP CURRENT, IOUT_A (A) 350 330 310 290 270 250 230 210 -60 VDD = 5.5V BOOST PULL-UP CURRENT, IOUT_B (A) 3.75 2.60 2.45 2.30 2.15 2.00 1.85 1.70 1.55 -60 VDD = 2.7V VDD = 5.5V VDD = 2.7V -40 -20 0 20 40 60 80 100 -40 -20 0 20 40 60 80 100 TEMPERATURE (C) TEMPERATURE (C) FIGURE 1. ACTIVE PULL-UP CURRENT, DDC PIN = 0V FIGURE 2. BOOST PULL-UP CURRENT, DDC PIN = VDD/2 120 STANDBY PULL-UP CURRENT, IOUT_SB (A) INPUT THRESHOLD LOW, VTRIPL (V) 110 100 90 VDD = 5.5V 80 70 60 50 40 -60 VDD = 2.7V 0.95 0.90 0.85 0.80 0.75 0.70 0.65 0.60 0.55 -60 VDD = 5.5V VDD = 2.7V -40 -20 0 20 40 60 80 100 -40 -20 0 20 40 60 80 100 TEMPERATURE (C) TEMPERATURE (C) FIGURE 3. STANDBY PULL-UP CURRENT, DDC1, 2 = VDD - 0.5V FIGURE 4. VTRIPL VOLTAGE 4 FN6303.1 June 22, 2006 ISL54103 Typical Performance Curves 0.70 INPUT THRESHOLD HIGH, VTRIPH (VDD-V) 0.65 0.60 0.55 VDD = 5.5V 0.50 VDD = 2.7V 0.45 0.40 0.35 0.30 -60 SUPPLY CURRENT, IDD (A) (Continued) 95 90 85 VDD = 5.5V 80 75 70 65 60 55 -60 VDD = 2.7V -40 -20 0 20 40 60 80 100 -40 -20 0 20 40 60 80 100 TEMPERATURE (C) TEMPERATURE (C) FIGURE 5. VTRIPH VOLTAGE FIGURE 6. IDD CURRENT, DDC1 = DDC2 = OPEN 3.5 BOOST PULL-UP CURRENT, IOUT_B (mA) 3.0 2.5 VDD = 5.0V 2.0 1.5 VDD = 2.7V 1.0 0.5 0 0 1 2 3 4 5 6 DDC VOLTAGE (V) FIGURE 7. BOOST PULL-UP CURRENT vs DDC VOLTAGE Functional Description DDC Overview DDC is a 2-wire serial communication standard based on the I2C standard. Devices communicate to each other using one clock (SCL) and one data (SDA) line. These are both bidirectional. Each signal is connected to a positive supply voltage via a current-source or pull-up resistor (see "System Diagram" on page 2). When the bus is free, both lines are HIGH. The output stages of all devices connected to the bus must have an open-drain or open-collector to perform the wired-AND function. Simple pull-up resistors on the clock and data lines work well unless there are long signal lines. The combined capacitance of long cables increases the rise time on the signal to such an extent that the communication becomes unreliable or fails to meet the bus timing specifications. Smaller value resistors can sometimes compensate for the extra capacitance, but this increases the current consumption when the signal lines are pulled LOW. ISL54103 Operation To improve the operation of the DDC where larger bus capacitance exists, the ISL54103 provides active pull-up using switched current sources. When the bus is idle and both lines are HIGH, a standby pull-up current of 100A is used to maintain the signal level while minimizing power FN6303.1 June 22, 2006 5 ISL54103 consumption. When either of the two signals is pulled LOW, an active pull-up current of 275A maintains a good VOL noise margin. When the bus line is released, it is pulled high by the ISL54103 active current until the voltage exceeds the VTRIPL level for a period of time. This voltage-time combination filters out noise on the signal line. Once the ISL54103 detects a valid rising edge, a 2.2mA boost current pulls the bus line high very quickly (see Figure 8). This boost current turns off when the input level reaches the VTRIPH threshold and the pull-up current returns to the active level. If both inputs are HIGH, the pull-up current drops to the standby level of 100A. With ISL54103 DDCA VTRIPH VDD VTRIPH With DDCA Without DDCA VTRIPL >20Vns (Typical) t Gnd DDC1 DDC2 FIGURE 10. NOISE SUPPRESSION. BOOST CURRENT APPLIED WHEN INPUT SIGNAL EXCEEDS 20Vns (TYPICAL) With RC Pullup VTRIPL R = 15.8K C = 200pF FIGURE 8. ISL54103 DDC SYSTEM BOOST PULL-UP COMPARED TO RESISTOR PULL-UP (VDD = 5.5V) With ISL54103 DDCA VTRIPH With RC Pullup VTRIPL R = 15.8K C = 200pF FIGURE 9. ISL54103 DDC SYSTEM BOOST PULL-UP COMPARED TO RESISTOR PULL-UP (VDD = 2.7V) 6 FN6303.1 June 22, 2006 ISL54103 Package Outline Drawing 5-Lead, SOT23, Package Code H5 0.007 (0.20) B 0.0006 (0.15) 0.054 (1.38) BSC 0.065 (1.65) 0.061 (1.55) 0.108 (2.75) BSC B C L 4X 0.35 H A-B D 0.35 C A-B D 2X N/2 TIPS 1 0.075 (1.90) BSC 3 12 REF. TYP. 0.118 (3.00) 0.110 (2.80) 0.033 (0.85) 0.035 (0.90) 0.038 (0.95) BSC Parting Line Seating Plane 0.0008 (0.02) 0.0040 (0.10) 0.043 (1.10) MAX 0-8C 0.575 REF. 0.10 R MIN. 0.20 in 0.10 R MIN. SEATING PLANE .019 (0.50) .012 (0.30) NOTES: 1. ALL DIMENSIONS IN INCHES (IN PARENTHESES IN MILLIMETERS) 2. PACKAGE DIMENSIONS EXCLUDE MOLDING FLASH 3. DIMENSIONING AND TOLERANCES PER ASME, Y14.5-1994 4. THIS PART IS COMPLIANT WITH JEDEC SPECIFICATION MO-193. 5. THIS PART IS FULL COMPLIANCE TO EIAJ SPECIFICATION SC-74 All Intersil U.S. products are manufactured, assembled and tested utilizing ISO9000 quality systems. Intersil Corporation's quality certifications can be viewed at www.intersil.com/design/quality Intersil products are sold by description only. Intersil Corporation reserves the right to make changes in circuit design, software and/or specifications at any time without notice. Accordingly, the reader is cautioned to verify that data sheets are current before placing orders. Information furnished by Intersil is believed to be accurate and reliable. However, no responsibility is assumed by Intersil or its subsidiaries for its use; nor for any infringements of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Intersil or its subsidiaries. For information regarding Intersil Corporation and its products, see www.intersil.com 7 FN6303.1 June 22, 2006 |
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