Hex inverter/buffer drivers (open-collector)
TYPICAL PROPAGATION DELAYS VERSUS LOAD FOR OPEN COLLECTOR OUTPUTS
Load resistor (Ω)
When using Open-Collector parts, the value of the pull-up resistor greatly affects the value of the tPLH. For example, changing the specified
pull-up resistor value from 500Ω to 100Ω will improve the tPLH up to 50% with only a slight increase in the tPHL. However, if the value of the
pull-up resistor is changed, the user must make certain that the total IOL current through the resistor and the total IIL’s of the receivers does not
exceed the IOL maximum specification.
July 24, 1992