GS2989 Datasheet, PDF (11/19 Pages) Gennum Corporation – Dual-Slew-Rate, Dual-Output Cable Driver with 3Gb/s Capability

Control of the slew rate is determined by the setting of the SD/HD input pin.
Table 4-2: Slew Rate Selection
SD/HD
0
1
Floating
Rise/Fall Time
SMPTE 424M & 292M compliant
SMPTE 259M compliant
SMPTE 259M compliant
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.
Table 4-3: Output Disable
DISABLE1
0
0
1 or Floating
1 or Floating
Floating
DISABLE2
0 or Floating
1
0 or Floating
1
Floating
SDO1/SDO1
SDO2/SDO2
All Chip Power Down
High-Impedance
Operational
Operational
High-Impedance
Operational
Operational
Operational
High-Impedance
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.
GS2989 Dual-Slew-Rate, Dual-Output Cable Driver
with 3Gb/s Capability
Data Sheet
52133 - 4
December 2010
11 of 19