5 Parameter Measurement Information

Load Circuit and Voltage Waveforms

Figure 5-1. Load Circuit

Figure 5-2. Voltage Waveforms

Propagation Delay And Output Transition Times

Figure 5-3. Voltage Waveforms

Enable and Disable Times For 3-State Outputs

Figure 5-4. Voltage Waveform Input Rise and Fall Times

A. CL includes probe and test-fixture capacitance.

B. Waveform 1 is for an output with internal conditions such that the output is low except when disabled by the

output control.

Waveform 2 is for an output with internal conditions such that the output is high except when disabled by the

output control.

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

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

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

E. tPLZ and tPHZ are the same as tdis.

F. tPZL and tPZH are the same as ten.

G. tPLH and tPHL are the same as tpd.

www.ti.com

SN74HC253-Q1

SCLS519B – JULY 2003 – REVISED JANUARY 2025

Copyright © 2025 Texas Instruments Incorporated

Submit Document Feedback

7

Product Folder Links: SN74HC253-Q1