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GS2989-INTE3Z Datasheet(PDF) 11 Page - Gennum Corporation |
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GS2989-INTE3Z Datasheet(HTML) 11 Page - Gennum Corporation |
11 / 19 page GS2989 Dual-Slew-Rate, Dual-Output Cable Driver with 3Gb/s Capability Data Sheet 52133 - 4 December 2010 11 of 19 Control of the slew rate is determined by the setting of the SD/HD input pin. 4.4 Output Disable The GS2989 supports an output disable function for each serial data differential output. Control of this function is determined by the setting of the DISABLE1 and DISABLE2 control pins. The serial output disables (DISABLE1 and DISABLE2), disable power to the current mode serial data output drivers. When asserted LOW, the SDO/SDO output drivers are powered-down. When DISABLE1 and DISABLE2 are driven LOW simultaneously, the entire device is powered down, and the power consumption is minimized. 4.5 Output Signal Presence Indicator (OSP) The GS2989 supports an output signal presence indicator function. The output signal presence pin (OSP) is an active-low output that indicates when a valid output signal has been detected at the pre-driver output. The output signal presence function measures signal-edge energy to indicate that the pre-driver to the serial data outputs is toggling. Table 4-2: Slew Rate Selection SD/HD Rise/Fall Time 0 SMPTE 424M & 292M compliant 1 SMPTE 259M compliant Floating SMPTE 259M compliant Table 4-3: Output Disable DISABLE1 DISABLE2 SDO1/SDO1 SDO2/SDO2 0 0 or Floating All Chip Power Down 0 1 High-Impedance Operational 1 or Floating 0 or Floating Operational High-Impedance 1 or Floating 1 Operational Operational Floating Floating Operational High-Impedance |
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