Macintosh-HW
/
RASCSI
mirror of https://github.com/akuker/RASCSI.git
1
0
Fork 0
Code Issues Projects Releases Wiki Activity

Converted bus transceiver and linear regulator information into a table.

PhrAx 2020-08-18 00:08:32 -07:00
parent c9edf3fc9a
commit 5d9934e0d1
1 changed files with 11 additions and 26 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

37
Transceiver-Comparison.md

@ -1,33 +1,18 @@
The original RaSCSI uses the [SN74LS641](https://www.ti.com/lit/ds/symlink/sn74ls641.pdf) bus transceiver. However, with each device needed 4 of these @ $3.30 each, the amounts to a significant percentage of the cost. The following contains some notes regarding what other SCSI emulators have used.
- RaSCSI Original Version
- [SN74LS641-1](https://www.mouser.com/ProductDetail/Texas-Instruments/SN74LS641-1DW?qs=SL3LIuy2dWxXHvPKLk%252BfLw%3D%3D)
- [Data Sheet](https://www.ti.com/lit/ds/symlink/sn74ls641.pdf)
- Cost: $3.30
- Qty Needed: 4
- Note: VCC is 5v
- [Scuznet](https://github.com/saybur/scuznet)
- [SN74LVTH126DR](https://www.mouser.com/ProductDetail/Texas-Instruments/SN74LVTH126DR/?qs=sGAEpiMZZMtYFXwiBRPs0%252b5WI0cyeyLc)
- Cost: $0.64
- Qty Needed: 4
- Scsi2SD - According to [LC-SCSI](https://github.com/pgodwin/LC-SCSI/wiki)
- [SN74LVT245B](https://www.mouser.com/ProductDetail/Texas-Instruments/SN74LVT245BPWR?qs=afYny40WCj1v38f4br9Q%2Fg%3D%3D)
- [Data Sheet](https://www.ti.com/lit/ds/symlink/sn74lvt245b.pdf)
- Cost: $0.90
- Qty Needed: 4
- Note: VCC is 3.3v
- Potential Alternative - 74AHC245
- [74AHC245](https://datasheet.lcsc.com/szlcsc/Nexperia-74AHCT245PW-118_C173388.pdf)
- Cost: [$0.22](https://lcsc.com/product-detail/74-Series_Nexperia-74AHCT245PW-118_C173388.html)
- Qty Needed: 4
- Note: VCC is 5v
| Product | Chip and Datasheet | Cost ($) | Qty needed | Notes |
| - | - | - | - | - |
| RaSCSI Original Version | [SN74LS641-1](https://www.mouser.com/ProductDetail/Texas-Instruments/SN74LS641-1DW?qs=SL3LIuy2dWxXHvPKLk%252BfLw%3D%3D) | 3.30 | 4 | VCC is 5v |
| [Scuznet](https://github.com/saybur/scuznet) | [SN74LVTH126DR](https://www.mouser.com/ProductDetail/Texas-Instruments/SN74LVTH126DR/?qs=sGAEpiMZZMtYFXwiBRPs0%252b5WI0cyeyLc) | 0.64 | 4 | - |
| Scsi2SD - According to [LC-SCSI](https://github.com/pgodwin/LC-SCSI/wiki) | [SN74LVT245B](https://www.mouser.com/ProductDetail/Texas-Instruments/SN74LVT245BPWR?qs=afYny40WCj1v38f4br9Q%2Fg%3D%3D), [Data Sheet](https://www.ti.com/lit/ds/symlink/sn74lvt245b.pdf) | 0.90 | 4 | VCC is 3.3v |
| Potential Alternative - 74AHC245 | [74AHC245](https://datasheet.lcsc.com/szlcsc/Nexperia-74AHCT245PW-118_C173388.pdf) | [0.22](https://lcsc.com/product-detail/74-Series_Nexperia-74AHCT245PW-118_C173388.html) | 4 | VCC is 5v |
Other parts
- Linear Regulator (for active terminator)
- [LM1117SX](https://www.mouser.com/ProductDetail/Texas-Instruments/LM1117SX-ADJ-NOPB?qs=X1J7HmVL2ZFVdHO2uaroKA%3D%3D)
- LDO Voltage Regulators 800mA LDO Linear Reg
- Cost: $1.51
Some additional parts
| Part| Chip and Datasheet | Cost ($) | Qty needed | Notes |
| - | - | - | - | - |
| Linear Regulator (for active terminator) | [LM1117SX](https://www.mouser.com/ProductDetail/Texas-Instruments/LM1117SX-ADJ-NOPB?qs=X1J7HmVL2ZFVdHO2uaroKA%3D%3D) | 1.51 | 1 | 800mA LDO |
## Discussion