74x Family Characteristics
I've split this into three pages. Below you will find what the abbreviations used in the tables mean:
Abbreviation: Meaning:
f toggle frequency
VIH logic level 1 input voltage
VIL logic level 0 input voltage
VOH logic level 1 output voltage
tPLH prop delay from low to high
tPHL prop delay from high to low
tPZH prop delay from high impedance to high
VOL logic level 0 output voltage, IOH, IOL, IIH, IIL similarly.
tPZL prop delay from high impedance to low, tPHZ, tPLZ similarly

                                    * for VOH, assume VCC=5 V
                                    ** for VOH, assume VCC=4.5 V

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