The MC100LVEL91 is a triple LVPECL input to ECL output translator. The device receives standard or low voltage differential PECL signals, determined by the VCC supply level, and translates them to differential -3.3 V to -5.0 V ECL output signals. (For translation from 5.0 V PECL to -5 V ECL output, see MC100EL91.)
To accomplish the level translation the LVEL91 requires three power rails. The V
supply should be connected to the positive supply, and the V
pin should be connected to the negative power supply. The GND pins are connected to the system ground plane. Both V
and V
should be bypassed to ground via 0.01 µF capacitors.
Under open input conditions, the Dbar input will be biased at V
/2 and the D input will be pulled to GND. This condition will force the Q output to a low, ensuring stability.
The V
pin, an internally generated voltage supply, is available to this device only. For single-ended input conditions, the unused differential input is connected to V
as a switching reference voltage.V
may also rebias AC coupled inputs. When used, decouple V
and V
via a 0.01 µF capacitor and limit current sourcing or sinking to 0.5 mA. When not used, V
should be left open.

• 620 ps Typical Propagation Delay
• The 100 Series Contains Temperature Compensation
• Operating Range: V
• = 3.8 V to 3.3 V; V
• = -3.0 V to -3.8 V; GND= 0 V
• Q Output will Default LOW with Inputs Open or at GND
• Pb-Free Packages are Available