Is this inverter logic gate TTL compatible?

[KJ-90]

I was wondering if this circuit online at http://www.nutsvolts.com/magazine/article/understanding_digital_logic_ics_part_1 in Figure 2a has a standard TTL compatible input and output. I'm not sure if the circuit will work from a standard TTL power supply of +5V. If the inputs and outputs aren't TTL compatible, what resistor values should I use ( assume I'm driving one TTL load ) and what silicon NPN transistor should I use? I need to have resistor values for both standard and full pull up output. If you are wondering why I'm using this circuit, it is for a vintage technology reproduction project.

[fourtytwo42]

They are compatible with 5V logic but do not have the same input thresholds, output currents, propagation delay's nor slew rates however that doesn't stop you using them in conjunction with 74xx gates.

[T3sl4co1l]

In practice, probably.

It would match up much better with a base-emitter resistor.  This is necessary for clean operation of most switching BJT circuits, but is often omitted out of simplicity (or laziness, or ignorance).

The problem is that V_IL is around 0.5V, lesser than TTL's 0.8V.

Tim

[Audioguru]

The text shows that the transistor with resistors is an RTL circuit, not a TTL circuit. Both logic families are very old, Cmos is used today.
Why do you want an RTL circuit to work in a TTL circuit? They are both completely different. If you want a TTL inverter then buy an IC that has them.

[matseng]

And without a Baker clamp or a well-choosen pulldown resistor at the base you won't have much joy if you're trying to invert a signal at about 100khz or more. Being saturated the transistor will happily stay in conduction for a long time after the input switched to low.

[Audioguru]

How many of us have seen an RTL circuit in operation? I haven't.
I used DTL about 50 years ago, then TTL a few years later. I discovered Cmos logic about 40 years ago and have used it ever since.