ZHCSQ25E December 1982 – February 2022 SN54HC157 , SN74HC157
PRODUCTION DATA
6 Parameter Measurement Information
tpd is the maximum between tPLH and tPHL
Figure 6-1 Load Circuit
Figure 6-3 Voltage WaveformInput Rise and Fall Times
Figure 6-2 Voltage WaveformsPropagation Delay and Output Transition 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 charactersitics: 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.