Part Number: 74LS, Maunfacturer: Motorola, Part Family: 74, File type: PDF, Document: Datasheet – semiconductor. 74LS datasheet, 74LS circuit, 74LS data sheet: MOTOROLA – 1-OF- 10 DECODER/DRIVER OPEN-COLLECTOR,alldatasheet, datasheet. 74LS datasheet, 74LS circuit, 74LS data sheet: ONSEMI – 1-of Decoder / Drvier Open-Collector,alldatasheet, datasheet, Datasheet search site .

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The bases of the bipolars would be connected to the outputs of the 74LS 74l145 resistors. I assume that this means that I connect the outputs to my logic VCC via 74ps So, for the meantime, it looks like my original plan stands, minus the base resistors thanks John! All operating parameters, including “Typicals” must be validated for each customer application by customer’s technical experts.

74LS145 – BCD to Decimal Decoder/Driver

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If you want to datashewt the FET, substitute the source for the emitter, the gate for the base, and the drain for the collector. The new topic will begin with this message.

Thanks for your help on this guys! Since dataseet outputs of the LS are active low when selected, and the FET gate is active high, the transistor as 74ls14 show it in your picture gives the inversion you need. That makes my life much easier, although I will have to check on the manufacturer of the devices that I have to make sure that they have the higher voltage tolerance.


74LS Datasheet PDF / TI –

BCD inputs and provide appropriate outputs to drive digit incandescent displays. SCILLC makes no warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does SCILLC assume any liability arising out of the application or use of any product or circuit, and specifically disclaims any and all liability, including without limitation special, consequential or incidental damages.

I would then have bipolar NPN transistors with the collectors connected to 12V via dwtasheet.

This is certainly a technique to apply for other applications I have a LOT to learn in the analogue fieldbut I think that we would have the same issue that John pointed out — the control signals are inverted and still need to be flipped before they get to the output device.

Do I need to put an inverters between the 74LS and the bipolars?

I amy have misundertood you completely, but I think there is a much simpler solution. Subject of the new topic: You can skip the bipolar alltogether, and connect your pull-up directly eatasheet 12V.

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If the 74LS will sink enough current, I think you should be able to meet your needs with a cascode stage, and this will only require one transistor and maybe one resistor per output.

74LS (Hitachi) – Bcd-to-decimal Decoders / Drivers(with 15v Outputs)

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All outputs remain off for all invalid binary input conditions. Quoth Christian Bjelle at The Group moderators are datasheeet for maintaining their community and can address these issues.

Search Only Within This Topic. The gates of the HV drivers would be connected to collectors of the bipolars.