DS90LV027AH Datasheet, PDF (3/8 Pages) National Semiconductor (TI) – High Temperature LVDS Dual Differential Driver

Switching Characteristics (Continued)
Note 6: Generator waveform for all tests unless otherwise specified: f = 1 MHz, Z_O = 50Ω, t_r ≤ 1 ns, t_f ≤ 1 ns (10%-90%).
Note 7: The DS90LV027AH is a current mode device and only function with datasheet specification when a resistive load is applied to the drivers outputs.
Note 8: t_SKD1, |t_PHLD − t_PLHD|, is the magnitude difference in differential propagation delay time between the positive going edge and the negative going edge of
the same channel.
Note 9: t_SKD2 is the Differential Channel to Channel Skew of any event on the same device.
Note 10: t_SKD3, Differential Part to Part Skew, is defined as the difference between the minimum and maximum specified differential propagation delays. This
specification applies to devices at the same V_CC and within 5˚C of each other within the operating temperature range.
Note 11: t_SKD4, part to part skew, is the differential channel to channel skew of any event between devices. This specification applies to devices over recommended
operating temperature and voltage ranges, and across process distribution. t_SKD4 is defined as |Max − Min| differential propagation delay.
Note 12: f_MAX generator input conditions: t_r = t_f < 1 ns (0% to 100%), 50% duty cycle, 0V to 3V. Output criteria: duty cycle = 45%/55%, V_OD > 250mV, all channels
switching.
Parameter Measurement Information
20165104
FIGURE 1. Differential Driver DC Test Circuit
20165105
FIGURE 2. Differential Driver Propagation Delay and Transition Time Test Circuit
20165106
FIGURE 3. Differential Driver Propagation Delay and Transition Time Waveforms
3
www.national.com