100324 Datasheet, PDF (6/8 Pages) National Semiconductor (TI) – Low Power Hex TTL-to-ECL Translator

Test Circuit
Note:
• V_CC, V_CCA = 0V, V_EE = −4.5V, V_TTL = +5.0V, V_IH = +3.0V
• L1, L2 and L3 = equal length 50Ω impedance lines
• R_T = 50Ω terminator internal to scope
• Decoupling 0.1 µF from GND to V_CC, V_EE and V_TTL
• All unused outputs are loaded with 50Ω to −2V or with equivalent ECL terminator network
• C_L = Fixture and stray capacitance ≤ 3 pF
FIGURE 1. AC Test Circuit
Switching Waveform
FIGURE 2. Propagation Delay and Transition Times
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