I'm looking for a pair of otherwise interchangeable 8 bit output shift registers where one has open drain (or open collector) outputs, and the other has "normal logic outputs" (ie a pull up transistor and a pull down transistor, I've seen the term tri-state used, though I'm not certain that's exactly what I need). Can anyone suggest suitable parts?
I'm planning to build a PCB using large mosfets as final outputs, and these shift registers to drive them. I will only decide whether to use N-Chan or P-chan mosfets as high side or low side switches when I populate each board, the overall supply voltage to the mosfets will be anywhere from 3V up to 20 volts (I'm aware of the input voltage limits on mosfets).
For N-Chan mosfets I will use a "normal" shift register to drive the mosfet to 5v, or turn the mosfet off at 0v.
For P-Chan mosfets I will use a the open drain on the shift register to drive the mosfet down to ground, or let a pull up resistor float it up to supply voltage to turn it off.
I can find plenty of "normal" shift registers and a few open drain ones, but none of the parametric search tools are set up for telling me which have the same pinouts, and I'm not familiar enough with the parts to know which parts are a good place to look at. Many of the data sheets completely omit the details of the output circuitry.
Additionally I need latching and ideally PDIP, though I'll make the brave jump to SMD if I really have to. I'd like them to be cost effective, and I intend to run them at 5V, though 3.3v compatibility would be nice.
The closest I've found is the TI sn74ls595 and sn74ls596 which would do the job perfectly but are so old the datasheet on TI's site is scanned in and they cost a fortune to source. An alternative would be a way to use a normal a normal 595 shift register against a 20v pull up, but I'm confident that wouldn't end well without using a row of 8 transistors in the middle, and that's a parts count issue I'd rather avoid.
[edited to fix mosfet naming]
