6 Parameter Measurement Information

tPD is the maximum between tPLH and tPHL

tt is the maximum between tTLH and tTHL

Figure 6-1. HC and HCT transition times and

propagation delay times, combination logic

Figure 6-2. HCT transition times and tpopationg

delay times, combination logic

Figure 6-3. HC three-state propagation delay

waveform

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

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CD54HC243, CD74HC243, CD54HCT243, CD74HCT243

SCHS168E – NOVEMBER 1998 – REVISED MARCH 2022

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