5 Parameter Measurement Information

tpd is the maximum between tPLH and tPHL

Figure 5-1. Load Circuit

Figure 5-2. Voltage Waveforms

Propagation Delay and Output Transition Times

Figure 5-3. Voltage Waveform

Input Rise and Fall Times

A. CL includes probe and test-fixture capacitance.

B. Phase relationships between waveforms were chosen arbitrarily. All input pulses are supplied by generators

having the following characteristics: PRR ≤ 1 MHz, ZO = 50 Ω, tr = 6 ns, tf = 6 ns.

C. The outputs are measured one at a time with one input transition per measurement.

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SN54HC157, SN74HC157

SCLS113F – DECEMBER 1982 – REVISED FEBRUARY 2025

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