www.fairchildsemi.com

10

Test Circuitry (ECL-to-TTL)

Notes:

being monitored, and external 50

Ω resistance must be applied to serve as R

The TTL 3-STATE pull up switch is connected to

+7V only for ZL and LZ tests.

TTL and ECL force signals are brought to the DUT via 50

Ω coax lines.

FIGURE 3. ECL-to-TTL AC Test Circuit

Note:

DIR is LOW, and OE is HIGH

FIGURE 4. ECL-to-TTL Transition—Propagation Delay and Transition Times