Wide Logictranceivers with Hysteresis

I just designed one in, 74LVC244:

The NXP datasheet explicitly states "Schmitt-trigger action at all inputs" while TI doesn't. So I had the unfortunate situation of releasing one mfg and not another. But don't expect much detail even from the NXP datasheet, it ain't like in them good old days no more.

Hey, my design-in rate for NXP now went from 0% to 0.1%! Despite the fact that they seem unable to design a good web site.

Joerg wrote: ...

No specification about the hysteresis and no tranceiver, but thanks for the pointer (and I remember you mentioned the part in a similar thread that my search keywords didn't bring up...).

Bye

Well, I use it as a transceiver (back-to-back). It's fairly easy because they split them in half. As for the hysteresis, as I said, specsmanship ain't what it used to be. However, Philips always had excellent family specs so you might want to look those up. As long as NXP hasn't blown the access to that.

Chances are there may not be a Schmitt transceiver with layout-friendly pin-out and a defined hysteresis level. Or as they say in Germany you might have to bake one ;-)

Joerg wrote: ...

I already considered to use the XC2C32A in 44-VQFP package. You can program the Input for 500mV Hysteresis, Bus-Hold, Pullup or none. At 1E@1 pieces comparable to a SN74LVC16245ADGGR at 0.91@1, disregarding the need for the

At least module transceiver ( inout [15:0] busa, inout [15:0] busb, input dir ); assign busa = (dir)? busb: 16'bz; assign busb = (dir)? 16'bz: busa; endmodule

fits in the XC2c32a and implements a 16 bit transceiver with Direction input.

I wonder why so few modern logic series offer hysteresis as inputs option.

Cheers

That is what I have wondered about since the start of my career. I mean, it ain't rocket science to implement it. I was never fond of programmables. The first ones (PALs) were extremely inefficient when it came to power consumption while the newer ones are typically single-sourced and have rather short production life spans.