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SN74LS244: Input and output impedance range

Part Number: SN74LS244

Hi Team,

Customer is asking for device input.output impedance range of this device, can any expert help? Please help to correct or add if I miss anything.


VOH: (max & typ)

In Sat Region: Ro (min): VOH min / IOH max = 2V / 15mA = 133.3 Ω

In Active Region: Ro (typ): VOH typ / IOH typ = 3.4V / 3mA = 1133 Ω

VOL: (max)

In Sat Region: Ro (max): VOL max / IOL max = 0.5V / 24mA = 20.8 Ω

In Active Region: No Info.

VIH: (max)

Vi / IIH (max) = 2.7V / 20uA = 135K Ω

VIL: (max)

Vi / IIL (max) = 0.4V / 0.2mA =  2K Ω