100329 データシートの表示（PDF） - Fairchild Semiconductor

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100329

Low Power Octal ECL/TTL Bidirectional Translator with Register

Fairchild Semiconductor 

Test Circuitry (TTL-to-ECL)

Note 11: RT = 50Ω termination resistive load. When an input or output is being monitored by a scope, RTis supplied by the scope’s 50Ω input resistance.

When an input or output is not being monitored, an external 50Ω resistance must be applied to serve as RT.

Note 12: TTL and ECL force signals are brought to the DUT via 50Ω coax lines.

Note 13: VTTL is decoupled to ground with 0.1 µF, VEE is decoupled to ground with 0.01 µF and VCC is connected to ground.

FIGURE 1. TTL-to-ECL AC Test Circuit

Switching Waveforms (TTL-to-ECL)

FIGURE 2. TTL to ECL Transition—Propagation Delay and Transition Times

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