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floobydust
 Post subject: Re: NXP 28L92 DUAL UART
PostPosted: Fri Apr 07, 2023 1:39 am 
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+1 on that... it's a great chip! I switched from the older SCC2691 to it over a year ago... and no plans to use anything else, except the TI version, which is QFP-44 ;-)

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floobydust
PostPosted: Sat May 13, 2023 2:17 am 
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BigDumbDinosaur wrote:
PRODUCT AVAILABILITY UPDATE

I was advised today by my sales rep at Mouser that they have received 2,000 pieces of 28L92 DUARTs in PLCC-44. This is NXP part number SC28L92A1A,518, which is what I am using in my POC units.

If you’ve been hankering to try out this device but were put off at the thought of dealing with the dinky QFP44 package, here’s your chance! I wouldn’t wait too long to act, as I suspect that inventory is going to go fairly quickly. The Exar and TI equivalents are also in stock, but are in QFP, not PLCC.


I placed an order for qty. 10, they came in the other day... so I have some stock for later, should I need them. I also picked up a couple of the TI QFP versions... so I have options for the next hardware build.

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BigDumbDinosaur
 Post subject: Re: NXP 28L92 DUAL UART
PostPosted: Sun May 21, 2023 4:53 am 
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Just a bump and reminder that if there is enough interest, I will have modules produced that mount one or two 28L92s dual UARTs (DUART), with the module pinned to a 0.100" pitch. The two-DUART version would give four, high-speed serial channels, plus two precision timers and a bevy of general-purpose I/O pins. Although I haven’t tried it, a four-DUART module would certainly be possible and would give eight serial channels, four timers and a ton of GP I/O.

My POC V1.3 unit runs two 28L92s and can simultaneously manage 230.4 Kbps in both directions on all four channels, even with the Ø2 clock throttled back to 4 MHz.

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floobydust
 Post subject: Re: NXP 28L92 DUAL UART
PostPosted: Thu May 25, 2023 1:39 am 
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Just an FYI, all of Mousers stock is now gone, but they can order more if needed with a long lead time of 72 weeks for delivery.

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BigDumbDinosaur
 Post subject: Re: NXP 28L92 DUAL UART
PostPosted: Thu May 25, 2023 11:28 pm 
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floobydust wrote:
Just an FYI, all of Mousers stock is now gone, but they can order more if needed with a long lead time of 72 weeks for delivery.

Meanwhile, Mouser shows 300+ pieces of Exar’s TQFP44 XR88C192 due in mid-June. The XR88C192 is functionally identical to the 28L92, except it doesn’t have the I/M bus mode selection input—the XR88C192 always operates in x86 mode.

The more-expensive TI version of the 28L92 does have the I/M input and is in QFP44. Mouser shows over 200 in stock.

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BigDumbDinosaur
 Post subject: Re: NXP 28L92 DUAL UART
PostPosted: Thu Jun 29, 2023 7:07 pm 
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---> BUMP <---

Mouser shows stock on the NXP 28L92 DUART in PLCC44. The TI version in QFP44 is also in stock.

As a reminder, if there is enough interest, I will have modules produced that mount one or two 28L92s dual UARTs (DUART), with the module pinned to a 0.100" pitch for convenient use. There is no good reason to use the extremely obsolete 65C51 or the cantankerous 1655x series (especially the 16550, which has a receiver hardware defect) when a high-performance and versatile dual UART is available.

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