DS90CF388AVJDX/NOPB

DS90C387A,DS90CF388A DS90C387A/DS90CF388A Dual Pixel LVDS Display Interface / FPD-Link Literature Number: SNLS065D DS90C387A/DS90CF388A Dual Pixel LVDS Display Interface / FPD-Link General Description The DS90C387A/DS90CF388A transmitter/receiver pair is designed to support dual pixel data transmission between Host and Flat Panel Display up to QXGA resolutions. The transmitter converts 48 bits (Dual Pixel 24-bit color) of CMOS/TTL data and 3 control bits into 8 LVDS (Low Voltage Differential Signalling) data streams. At a maximum dual pixel rate of 112MHz, LVDS data line speed is 784Mbps, providing a total throughput of 5.7Gbps (714 Megabytes per second). The LDI chipset is improved over prior generations of FPDLink devices and offers higher bandwidth support and longer cable drive. To increase bandwidth, the maximum pixel clock rate is increased to 112 MHz and 8 serialized LVDS outputs are provided. Cable drive is enhanced with a user selectable pre-emphasis feature that provides additional output current during transitions to counteract cable loading effects. The DS90C387A transmitter provides a second LVDS output clock. Both LVDS clocks are identical. This feature supports backward compatibility with the previous generation of FPDLink Receivers - the second clock allows the transmitter to interface to panels using a ’dual pixel’ configuration of two 24-bit or 18-bit FPD-Link receivers. This chipset is an ideal means to solve EMI and cable size problems for high-resolution flat panel applications. It pro- vides a reliable interface based on LVDS technology that delivers the bandwidth needed for high-resolution panels while maximizing bit times, and keeping clock rates low to reduce EMI and shielding requirements. For more details, please refer to the “Applications Information” section of this datasheet. Features n n n n n n n n n n n Supports SVGA through QXGA panel resolutions 32.5 to 112/170MHz clock support Drives long, low cost cables Up to 5.7 Gbps bandwidth Pre-emphasis reduces cable loading effects Dual pixel architecture supports interface to GUI and timing controller; optional single pixel transmitter inputs support single pixel GUI interface Transmitter rejects cycle-to-cycle jitter 5V tolerant on data and control input pins Programmable transmitter data and control strobe select (rising or falling edge strobe) Backward compatible with FPD-Link Compatible with ANSI/TIA/EIA-644-1995 LVDS Standard Generalized Transmitter Block Diagram 10132002 TRI-STATE ® is a registered trademark of National Semiconductor Corporation. © 2006 National Semiconductor Corporation DS101320 www.national.com DS90C387A/DS90CF388A Dual Pixel LVDS Display Interface / FPD-Link February 2006 DS90C387A/DS90CF388A Generalized Receiver Block Diagram 10132003 Generalized Block Diagrams 10132001 www.national.com 2 Package Derating: If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. Supply Voltage (VCC) CMOS/TTL Output Voltage 18.2mW/˚C above +25˚C DS90CF388 A 18.2mW/˚C above +25˚C ESD Rating: −0.3V to +4V CMOS/TTL Input Voltage DS90C387 A DS90C387A −0.3V to +5.5V > 6 kV > 300 V (HBM, 1.5kΩ, 100pF) (EIAJ, 0Ω, 200pF) −0.3V to (VCC + 0.3V) DS90CF388A LVDS Receiver Input Voltage −0.3V to +3.6V LVDS Driver Output Voltage −0.3V to +3.6V LVDS Output Short Circuit Duration Continuous Recommended Operating Conditions Junction Temperature +150˚C Min Nom Max Units Storage Temperature −65˚C to +150˚C Supply Voltage (VCC) 3.0 3.3 3.6 V Operating Free Air Temperature (TA) −10 +25 +70 ˚C > 2 kV > 200 V (HBM, 1.5kΩ, 100pF) (EIAJ, 0Ω, 200pF) Lead Temperature (Soldering, 4 sec.) +260˚C Maximum Package Power Dissipation Capacity @ 25˚C Receiver Input Range 100 TQFP Package: 0 Supply Noise Voltage (VCC) DS90C387A 2.8W DS90CF388A 2.8W 2.4 V 100 mVp-p Electrical Characteristics Over recommended operating supply and temperature ranges unless otherwise specified. Symbol Parameter Conditions Min Typ Max Units CMOS/TTL DC SPECIFICATIONS (Tx inputs, Rx outputs, control inputs and outputs) VIH High Level Input Voltage 2.0 VCC V VIL Low Level Input Voltage GND 0.8 V VOH High Level Output Voltage IOH = −0.4 mA 2.7 2.9 V IOH = −2 mA 2.7 2.85 V VOL Low Level Output Voltage IOL = 2 mA 0.1 0.3 V VCL Input Clamp Voltage ICL = −18 mA −0.79 −1.5 V IIN Input Current VIN = 0.4V, 2.5V or VCC +1.8 +15 µA IOS Output Short Circuit Current VOUT = 0V −120 mA 450 mV 35 mV VIN = GND −15 0 µA LVDS DRIVER DC SPECIFICATIONS VOD Differential Output Voltage ∆VOD Change in VOD between Complimentary Output States RL = 100Ω 250 VOS Offset Voltage ∆VOS Change in VOS between Complimentary Output States 1.125 IOS Output Short Circuit Current VOUT = 0V, RL = 100Ω IOZ Output TRI-STATE ® Current PD = 0V, VOUT = 0V or VCC 345 1.25 1.375 V 35 mV −3.5 −10 mA ±1 ± 10 µA LVDS RECEIVER DC SPECIFICATIONS VTH Differential Input High Threshold VTL Differential Input Low Threshold IIN Input Current VCM = +1.2V +100 −100 VIN = +2.4V, VCC = 3.6V VIN = 0V, VCC = 3.6V 3 mV mV ± 10 ± 10 µA µA www.national.com DS90C387A/DS90CF388A Absolute Maximum Ratings (Note 1) DS90C387A/DS90CF388A Electrical Characteristics (Continued) Over recommended operating supply and temperature ranges unless otherwise specified. Symbol Parameter Conditions Min Typ Max Units 115 160 mA 145 200 mA 165 230 mA 210 260 mA f = 32.5 MHz 92 140 mA f = 65 MHz 100 150 mA f = 85 MHz 110 170 mA f = 112 MHz 130 190 mA 4.8 50 µA TRANSMITTER SUPPLY CURRENT ICCTW Transmitter Supply Current Worst Case Transmitter Supply Current 16 Grayscale ICCTZ Transmitter Supply Current Power Down RL = 100Ω, CL = 5 f = 32.5 MHz pF, f = 65 MHz Worst Case Pattern f = 85 MHz (Figures 1, 3), DUAL=High f = 112 MHz (48-bit RGB) 100Ω, CL = 5 pF, 16 Grayscale Pattern (Figures 2, 3), DUAL=High (48-bit RGB) PD = Low Driver Outputs in TRI-STATE under Powerdown Mode RECEIVER SUPPLY CURRENT ICCRW ICCRG ICCRZ Receiver Supply Current Worst Case Receiver Support Current 16 Grayscale Receiver Supply Current Power Down CL = 8 pF, Worst Case Pattern (Figures 1, 4), DUAL = High (48-bit RGB) f = 32.5 MHz 100 140 mA f = 65 MHz 150 200 mA f = 85 MHz 170 220 mA f = 112 MHz 185 240 mA CL = 8 pF, 16 Grayscale Pattern (Figures 2, 4), DUAL = High (48-bit RGB) f = 32.5 MHz 45 80 mA f = 65 MHz 60 110 mA f = 85 MHz 85 130 mA f = 112 MHz 110 160 mA 255 300 µA PD = Low Receiver Outputs stay low during Powerdown mode. Note 1: “Absolute Maximum Ratings” are those values beyond which the safety of the device cannot be guaranteed. They are not meant to imply that the device should be operated at these limits. The tables of “Electrical Characteristics” specify conditions for device operation. Note 2: Typical values are given for VCC = 3.3V and T A = +25˚C. Note 3: Current into device pins is defined as positive. Current out of device pins is defined as negative. Voltages are referenced to ground unless otherwise specified (except VOD and ∆VOD). www.national.com 4 Over recommended operating supply and temperature ranges unless otherwise specified. Symbol Parameter TCIT TxCLK IN Transition Time (Figure 5) TCIP TxCLK IN Period (Figure 6) DUAL=Gnd or Vcc DUAL=1/2Vcc Min Typ Max Units 1.0 2.0 3.0 ns ns 1.0 1.5 1.7 DUAL=Gnd or Vcc 8.928 T 30.77 ns DUAL=1/2Vcc 5.88 15.38 ns ns TCIH TxCLK in High Time (Figure 6) 0.35T 0.5T 0.65T TCIL TxCLK in Low Time (Figure 6) 0.35T 0.5T 0.65T ns TXIT TxIN Transition Time 6.0 ns 1.5 Transmitter Switching Characteristics Over recommended operating supply and temperature ranges unless otherwise specified. Symbol LLHT Typ Max Units LVDS Low-to-High Transition Time (Figure 3), PRE = 0.75V (disabled) Parameter Min 0.14 0.7 ns LVDS Low-to-High Transition Time (Figure 3), PRE = Vcc (max) 0.11 0.6 ns LHLT LVDS High-to-Low Transition Time (Figure 3), PRE = 0.75V (disabled) 0.16 0.8 ns 0.11 0.7 TBIT Transmitter Output Bit Width DUAL=Gnd or Vcc TPPOS Transmitter Pulse Positions - Normalized f = 33 to 70 MHz −250 0 +250 ps f = 70 to 112 MHz −200 0 +200 ps LVDS High-to-Low Transition Time (Figure 3), PRE = Vcc (max) 1/7 TCIP DUAL=1/2Vcc ns ns 2/7 TCIP ns TCCS TxOUT Channel to Channel Skew TSTC TxIN Setup to TxCLK IN (Figure 6) 2.7 100 ps ns THTC TxIN Hold to TxCLK IN (Figure 6) 0 ns TJCC Transmitter Jitter Cycle-to-cycle (Figures 13, 14) (Note 5), DUAL=Vcc f = 112 MHz 85 100 ps f = 85 MHz 60 75 ps f = 65 MHz 70 80 ps f = 56 MHz 100 120 ps f = 32.5 MHz 75 110 ps TPLLS Transmitter Phase Lock Loop Set (Figure 8) 10 ms TPDD Transmitter Powerdown Delay (Figure 10) 100 ns 5 www.national.com DS90C387A/DS90CF388A Recommended Transmitter Input Characteristics DS90C387A/DS90CF388A Receiver Switching Characteristics Over recommended operating supply and temperature ranges unless otherwise specified. Symbol Typ Max Units CLHT CMOS/TTL Low-to-High Transition Time (Figure 4), Rx data out Parameter 1.52 2.0 ns CMOS/TTL Low-to-High Transition Time (Figure 4), Rx clock out 0.5 1.0 ns CHLT CMOS/TTL High-to-Low Transition Time (Figure 4), Rx data out 1.7 2.0 ns CMOS/TTL High-to-Low Transition Time (Figure 4), Rx clock out 0.5 1.0 ns T 30.77 ns RCOP RxCLK OUT Period (Figure 7) RCOH RxCLK OUT High Time (Figure 7)(Note 4) Min 8.928 f = 112 MHz 3.5 f = 85 MHz 4.5 ns ns 3.5 ns RCOL RxCLK OUT Low Time (Figure 7)(Note 4) f = 112 MHz f = 85 MHz 4.5 ns RSRC RxOUT Setup to RxCLK OUT (Figure 7)(Note 4) f = 112 MHz 2.4 ns f = 85 MHz 3.0 ns RHRC RxOUT Hold to RxCLK OUT (Figure 7)(Note 4) f = 112 MHz 3.4 ns f = 85 MHz 4.75 RPLLS Receiver Phase Lock Loop Set (Figure 9) 10 ms RPDD Receiver Powerdown Delay (Figure 11) 1 µs RSKM Receiver Skew Margin (Figure 12) (Notes 4, 6), ns f = 112 MHz 170 f = 100 MHz 170 240 ps ps f = 85MHz 300 350 ps f = 66MHz 300 350 ps Note 4: The Minimum and Maximum Limits are based on statistical analysis of the device performance over voltage and temperature ranges. This parameter is functionally tested on Automatic Test Equipment (ATE). ATE is limited to 85MHz. A sample of characterization parts have been bench tested at 112MHz to verify functional performance. Note 5: The limits are based on bench characterization of the device’s jitter response over the power supply voltage range. Output clock jitter is measured with a cycle-to-cycle jitter of ± 3ns applied to the input clock signal while data inputs are switching (see figures 15 and 16). A jitter event of 3ns, represents worse case jump in the clock edge from most graphics VGA chips currently available. This parameter is used when calculating system margin as described in AN-1059. Note 6: Receiver Skew Margin is defined as the valid data sampling region at the receiver inputs. This margin takes into account transmitter output pulse positions (min and max) and the receiver input setup and hold time (internal data sampling window - RSPOS). This margin allows for LVDS interconnect skew, inter-symbol interference (both dependent on type/length of cable) and clock jitter. RSKM ≥ cable skew (type, length) + source clock jitter (cycle to cycle). www.national.com 6 DS90C387A/DS90CF388A AC Timing Diagrams 10132010 FIGURE 1. “Worst Case” Test Pattern 10132011 FIGURE 2. “16 Grayscale” Test Pattern (Notes 7, 8, 9) Note 7: The worst case test pattern produces a maximum toggling of digital circuits, LVDS I/O and CMOS/TTL I/O. Note 8: The 16 grayscale test pattern tests device power consumption for a “typical” LCD display pattern. The test pattern approximates signal switching needed to produce groups of 16 vertical stripes across the display. Note 9: Figures 1, 2 show a falling edge data strobe (TxCLK IN/RxCLK OUT). 7 www.national.com DS90C387A/DS90CF388A AC Timing Diagrams (Continued) 10132012 FIGURE 3. DS90C387A (Transmitter) LVDS Output Load and Transition Times 10132013 FIGURE 4. DS90CF388A (Receiver) CMOS/TTL Output Load and Transition Times 10132014 FIGURE 5. DS90C387A (Transmitter) Input Clock Transition Time 10132015 FIGURE 6. DS90C387A (Transmitter) Setup/Hold and High/Low Times (Falling Edge Strobe) www.national.com 8 DS90C387A/DS90CF388A AC Timing Diagrams (Continued) 10132016 FIGURE 7. DS90CF388A (Receiver) Setup/Hold and High/Low Times 10132019 FIGURE 8. DS90C387A (Transmitter) Phase Lock Loop Set Time 10132020 FIGURE 9. DS90CF388A (Receiver) Phase Lock Loop Set Time 9 www.national.com DS90C387A/DS90CF388A AC Timing Diagrams (Continued) 10132021 FIGURE 10. Transmitter Power Down Delay 10132022 FIGURE 11. Receiver Power Down Delay 10132025 C — Setup and Hold Time (Internal data sampling window) defined by RSPOS (receiver input strobe position) min and max TPPOS — Transmitter output pulse position (min and max) RSKM ≥ Cable Skew (type, length) + LVDS Source Clock Jitter (cycle to cycle) + ISI (Inter-symbol interference) j Cable Skew — typically 10 ps to 40 ps per foot, media dependent j TJCC — Cycle-to-cycle LVDS Output jitter (TJCC) is less than 100 ps (worse case estimate). j ISI is dependent on interconnect length; may be zero See Applications Informations section for more details. FIGURE 12. Receiver Skew Margin www.national.com 10 DS90C387A/DS90CF388A AC Timing Diagrams (Continued) 10132027 FIGURE 13. TJCC Test Setup - DS90C387A 10132028 FIGURE 14. Timing Diagram of the Input Cycle-to-Cycle Clock Jitter 11 www.national.com DS90C387A/DS90CF388A DS90C387A Pin Descriptions — FPD Link Transmitter Pin Name I/O No. Description Rn, Gn, Bn, DE, HSYNC, VSYNC I 51 TTL level input. This includes: 16 Red, 16 Green, 16 Blue, and 3 control lines HSYNC, VSYNC, DE (Data Enable).(Note 10) AnP O 8 Positive LVDS differential data output. AnM O 8 Negative LVDS differential data output. CLKIN I 1 TTL level clock input. R_FB I 1 Programmable data strobe select. Rising data strobe edge selected when input is high. (Note 10) R_FDE I 1 Programmable control (DE) strobe select. Tied high for data active when DE is high. (Note 10) CLK1P O 1 Positive LVDS differential clock output. CLK1M O 1 Negative LVDS differential clock output. PD I 1 TTL level input. Assertion (low input) tri-states the outputs, ensuring low current at power down. (Note 10) PLLSEL I 1 PLL range select. This pin must be tied to VCC for auto-range. NC or tied to Ground is reserved for future use. Typical shift point is between 55 and 68 MHz. (Notes 10, 11) PRE I 1 Pre-emphasis level select. Pre-emphasis is active when input is tied to VCC through external pull-up resistor. Resistor value determines pre-emphasis level (see table in application section). For normal LVDS drive level (No pre-emphasis) leave this pin open (do not tie to ground).(Note 10) DUAL I 1 Three-mode select for dual pixel, single pixel, or single pixel input to dual pixel output operation. Single pixel mode when input is low (only LVDS channels A0 thru A3 and CLK1 are active) for power savings. Dual mode is active when input is high. Single in - dual out when input is at 1/2 Vcc. (Note 10) VCC I 4 Power supply pins for TTL inputs and digital circuitry. GND I 6 Ground pins for TTL inputs and digital circuitry. PLLVCC I 2 Power supply pin for PLL circuitry. PLLGND I 3 Ground pins for PLL circuitry. LVDSVCC I 3 Power supply pin for LVDS outputs. LVDSGND I 4 Ground pins for LVDS outputs. CLK2P/NC O 1 Additional positive LVDS differential clock output. Identical to CLK1P. No connect if not used. CLK2M/NC O 1 Additional negative LVDS differential clock output. Identical to CLK1M. No connect if not used. Note 10: Inputs default to “low” when left open due to internal pull-down resistor. Note 11: The PLL range shift point is in the 55 - 68 MHz range, typically the shift will occur during the lock time. www.national.com 12 Pin Name I/O No. Description AnP I 8 AnM I 8 Negative LVDS differential data inputs. Rn, Gn, Bn, DE, HSYNC, VSYNC O 51 TTL level data outputs. This includes: 16 Red, 16 Green, 16 Blue, and 3 control lines — HSYNC (LP), VSYNC (FLM), DE (Data Enable). RxCLK INP I 1 Positive LVDS differential clock input. RxCLK INM I 1 Negative LVDS differential clock input. RxCLK OUT O 1 TTL level clock output. The falling edge acts as data strobe. R_FDE I 1 Programmable control (DE) strobe select. Tied high for data active when DE is high. (Note 10) PLLSEL I 1 PLL range select. This pin must be tied to VCC for auto-range. NC or tied to Ground is reserved for future use. Typical shift point is between 55 and 68 MHz. (Notes 10, 11) PD I 1 TTL level input. When asserted (low input) the receiver data outputs are low and clock output is high. (Note 10) STOPCLK O 1 Indicates receiver clock input signal is not present with a logic high. With a clock input present, a low logic is indicated. VCC I 6 Power supply pins for TTL outputs and digital circuitry. GND I 10 Ground pins for TTL outputs and digital circuitry PLLVCC I 1 Power supply for PLL circuitry. PLLGND I 2 Ground pin for PLL circuitry. Positive LVDS differential data inputs. LVDSVCC I 2 Power supply pin for LVDS inputs. LVDSGND I 3 Ground pins for LVDS inputs. 2 No Connect. Make NO Connection to these pins - leave these pins open, do not tie to ground or VCC. CNTLE, CNTLF 13 www.national.com DS90C387A/DS90CF388A DS90CF388A Pin Descriptions — FPD Link Receiver DS90C387A/DS90CF388A LVDS Interface / TFT Data (Color) Mapping Different color mapping options exist. See National Application Notes 1127 and 1163 for details. only. Also, the DE signal is mapped to two LVDS sub symbols. The DS90CF388A only samples the DE bit on channel A2. Two FPD-Link receivers may also be used in place of the DS90CF388A, since the DS90C387A provides two LVDS clocks. If this is the case, the FPD-Link receiver datasheet needs to be consulted for recovery mapping information. In this application, it is possible to recover two signals of: DE, B17 and B27 from the transmitter. There are two reserved bits (RES). The DS90CF388A ignores these bits. If using separate FPD-Link receivers, the corresponding receiver outputs for these two bits should be left open (NC). The LVDS Clock waveshape is shown in Figure 15. Note that the rising edge of the LVDS clock occurs two LVDS sub symbols before the current cycle of data. The clock is compose of a 4 LVDS sub symbol HIGH time and a 3 LVDS sub symbol LOW time. The respective pin (transmitter and receiver) names are show in Figure 15. As stated above these names are not the color mapping information (MSB/LSB) but pin names only. Inputs B17 and B27 are double wide bits. If using the DS90CF388A, this bits are sampled in the back half of the bit 10132026 FIGURE 15. TTL Data Inputs Mapped to LVDS Outputs 387A/388A www.national.com 14 HOW TO CONFIGURE THE DS90C387A AND DS90CF388A FOR MOST COMMON APPLICATION TRANSMITTER FEATURES The transmitter is designed to reject cycle-to-cycle jitter which may be seen at the transmitter input clock. Very low cycle-to-cycle jitter is passed on to the transmitter outputs. This significantly reduces the impact of jitter provided by the input clock source, and improves the accuracy of data sampling. The transmitter is offered with programmable edge data strobes for convenient interface with a variety of graphics controllers. The transmitter can be programmed for rising edge strobe or falling edge strobe through a dedicated pin. A rising edge transmitter will inter-operate with a falling edge receiver without any translation logic. 1. To configure for single input pixel-to-dual pixel output application, the DS90C387 “DUAL” pin must be set to 1/2 Vcc=1.65V. This may be implemented using pull-up and pull-down resistors of 10kΩ. In this configuration, the input signals (single pixel) are split into odd and even pixel (dual pixels) starting with the odd (first) pixel outputs A0-to-A3 the next even (second) pixel outputs to A4-to-A7. The splitting of the data signal also starts with DE (data enable) transitioning from logic low to high indicating active data. The "R_FDE" pin must be set high in this case. The number of clock cycles during blanking must be an EVEN number. This configuration will allow the user to interface to an LDI receiver (DS90CF388A) or to two FPD-Link ’notebook’ receivers (DS90CF384A or DS90CF386). 2. To configure for single pixel or dual pixel application using the DS90C387A/DS90CF388A, the “DUAL” pin must be set to Vcc (dual) or Gnd (single). In dual mode, the transmitterDS90C387A has two LVDS clock outputs enabling an interface to two FPD-Link ’notebook’ receivers (DS90CF384A or DS90CF386). In single mode, outputs A4-to-A7 and CLK2 are disabled which reduces power dissipation. PRE-EMPHASIS Pre-Emphasis adds extra current during LVDS logic transition to reduce the cable loading effects. Pre-emphasis strength is set via a DC voltage level applied from min to max (0.75V to Vcc) at the “PRE” pin. A higher input voltage on the ”PRE” pin increases the magnitude of dynamic current during data transition. The “PRE” pin requires one pull-up resistor (Rpre) to Vcc in order to set the DC level. There is an internal resistor network, which cause a voltage drop. Please refer to the tables below to set the voltage level. The DS90CF388A is able to support single or dual pixel interface up to 112MHz operating frequency. This receiver may also be used to interface to a VGA controller with an integrated LVDS transmitter. TABLE 1. Pre-Emphasis DC Voltage Level With (Rpre) Rpre Resulting PRE Voltage Effects 1MΩ or NC 0.75V Standard LVDS 50kΩ 1.0V 9kΩ 1.5V 3kΩ 2.0V 1kΩ 2.6V 100Ω Vcc 50% pre-emphasis 100% pre-emphasis TABLE 2. Pre-Emphasis Needed Per Cable Length Frequency PRE Voltage Typical cable length 112MHz 1.0V 2 meters 112MHz 1.5V 5 meters 80MHz 1.0V 2 meters 80MHz 1.2V 7 meters 65MHz 1.5V 10 meters 56MHz 1.0V 10 meters Note 12: This is based on testing with standard shield twisted pair cable. The amount of pre-emphasis will vary depending on the type of cable, length and operating frequency. RSKM - RECEIVER SKEW MARGIN RSKM is a chipset parameter and is explained in AN-1059 in detail. It is the difference between the transmitter’s pulse position and the receiver’s strobe window. RSKM must be greater than the summation of: Interconnect skew, LVDS Source Clock Jitter (TJCC), and ISI (if any). See Figure 12. Interconnect skew includes PCB traces differences, connector skew and cable skew for a cable application. PCB trace and connector skew can be compensated for in the design of the system. Cable skew is media type and length dependant. POWER DOWN Both transmitter and receiver provide a power down feature. When asserted current draw through the supply pins is minimized and the PLLs are shut down. The transmitter outputs are in TRI-STATE when in power down mode. The receiver outputs are forced to a active LOW state when in the power down mode. (See Pin Description Tables). The PD pin should be driven HIGH to enable the device once VCC is stable. 15 www.national.com DS90C387A/DS90CF388A Applications Information DS90C387A/DS90CF388A Applications Information cycle-to-cycle basis, is also provided to reduce ISI (InterSymbol Interference). With pre-emphasis and DC balancing, a low distortion eye-pattern is provided at the receiver end of the cable. A cable deskew capability has been added to deskew long cables of pair-to-pair skew of up to +/−1 LVDS data bit time (up to 80 MHz Clock Rate). These three enhancements allow cables 5+ meters in length to be driven depending upon media and clock rate. (Continued) DS90C387/DS90CF388 The DS90C387A/CF388A chipset is electrically similar to the DS90C387/CF388. The DS90C387/CF388 is intended for improved support of longer cable drive. Cable drive is enhanced with a user selectable pre-emphasis feature that provides additional output current during transitions to counteract cable loading effects. Optional DC balancing on a Configuration Table TABLE 3. Transmitter / Receiver configuration table Pin R_FB (Tx only) R_FDE (both Tx and Rx) DUAL (Tx only) www.national.com Condition Configuration R_FB = VCC Rising Edge Data Strobe R_FB = GND Falling Edge Data Strobe R_FDE = VCC Active data DE = High R_FDE = GND Active data DE = Low DUAL=VCC 48-bit color (dual pixel) support DUAL=1/2VCC Single-to-dual support DUAL=Gnd 24-bit color (single pixel) support 16 DS90C387A/DS90CF388A Pin Diagram Transmitter-DS90C387A 10132006 17 www.national.com DS90C387A/DS90CF388A Pin Diagram Receiver-DS90CF388A 10132007 www.national.com 18 inches (millimeters) unless otherwise noted Dimensions show in millimeters Order Number DS90C387AVJD and DS90CF388AVJD NS Package Number VJD100A National does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and National reserves the right at any time without notice to change said circuitry and specifications. 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