ZHCSQ25E December 1982 – February 2022 SN54HC157 , SN74HC157
PRODUCTION DATA
请参考 PDF 数据表获取器件具体的封装图。
tpd is the maximum between tPLH and tPHL
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.