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Updated Transceiver Comparison (markdown)

akuker 2022-02-11 21:55:30 -06:00
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Transceiver-Comparison.md

@ -11,9 +11,9 @@ The original RaSCSI uses the [SN74LS641](https://www.ti.com/lit/ds/symlink/sn74l
| Unsuitable | [SN74LS245DW](https://www.ti.com/lit/ds/symlink/sn74ls245.pdf?HQS=TI-null-null-mousermode-df-pf-null-wwe&ts=1599280883179&ref_url=https%253A%252F%252Fwww.mouser.ca%252F) | 1.34| 4 | Can only sink 24mA, SCSI protocol requires 48mA |
| Unsuitable| [SN7406DRG4](https://www.ti.com/lit/ds/symlink/sn7406.pdf?HQS=TI-null-null-digikeymode-df-pf-null-wwe&ts=1599282149626)| 1.34 | 4 | Can only sink 40mA. Will require new layout and increase in chip count as it has less i/o than above. |
| Potential Candidate | [SN74ALS245A-1](https://www.ti.com/lit/ds/symlink/sn74als245a.pdf) | [$1.42 US](https://www.mouser.com/ProductDetail/Texas-Instruments/SN74ALS245A-1NSR?qs=zhgwDAIOVxtxt0cXsshpuw%3D%3D) | 4 | VCC 5v, -1 unit will sink 48mA |
| | [SN74F245DW](https://www.ti.com/lit/ds/symlink/sn74f245.pdf?)| [$1.11 US](https://www.mouser.com/ProductDetail/Texas-Instruments/SN74F245DW?qs=rshUhwi3fbYzYsqSsk5U6A%3D%3D) | 4 | Low state current can sink 48mA|
| | [SN74ABT245B](https://www.ti.com/lit/ds/symlink/sn74abt245b.pdf) | [$1.00 - $1.30 US](https://www.mouser.com/c/semiconductors/logic-ics/bus-transceivers/?m=Texas%20Instruments&series=SN74ABT245B) | |
| | [74HCT245D](https://assets.nexperia.com/documents/data-sheet/74HC_HCT245.pdf) | [$0.69 US](https://www.mouser.com/ProductDetail/Nexperia/74HCT245D653?qs=P62ublwmbi%2FKRO6CQW%252BPyg%3D%3D) | |
| 4 | [SN74F245DW](https://www.ti.com/lit/ds/symlink/sn74f245.pdf?)| [$1.11 US](https://www.mouser.com/ProductDetail/Texas-Instruments/SN74F245DW?qs=rshUhwi3fbYzYsqSsk5U6A%3D%3D) | 4 | Low state current can sink 48mA|
| 4 | [SN74ABT245B](https://www.ti.com/lit/ds/symlink/sn74abt245b.pdf) | [$1.00 - $1.30 US](https://www.mouser.com/c/semiconductors/logic-ics/bus-transceivers/?m=Texas%20Instruments&series=SN74ABT245B) | |
| 4 | [74HCT245D](https://assets.nexperia.com/documents/data-sheet/74HC_HCT245.pdf) | [$0.69 US](https://www.mouser.com/ProductDetail/Nexperia/74HCT245D653?qs=P62ublwmbi%2FKRO6CQW%252BPyg%3D%3D) | VCC is 5v. Datasheet reads input clamping current -20mA |
Note: as of 2020-08-04 the **SN74LS641-1** is the transceiver suggested when building the RaSCSI.