ZHCSQU0C November 1998 – July 2022 CD54HC640 , CD54HCT640 , CD74HC640 , CD74HCT640
PRODUCTION DATA
6 Parameter Measurement Information
tPD is the maximum between tPLH and tPHL
tt is the maximum between tTLH and tTHL
Figure 6-1 HC transition times and propagation delay times, combination
logic
Figure 6-3 HC three-state propagation delay waveform
Figure 6-2 HCT transition times and propagation delay times, combination
logic
Figure 6-4 HCT three-state propagation delay waveform
NOTE: Open drain waveforms tPLZ and tPZL are the same as those for three-state shown on the left. The test circuit is output RL = 1kΩ to VCC, CL = 50pF.
Figure 6-5 HC and HCT three-state propagation delay test circuit