4 layers304.5 × 217.2 mm
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Trilobyte-CPU/8-bit-computer
A DIY 8-bit computer built mostly with discrete logic chips
478 parts2
4 layers42.7 × 39.4 mm
Flags Register
Trilobyte-CPU/8-bit-computer2A DIY 8-bit computer built mostly with discrete logic chips
- Size
- 42.7 × 39.4 mm
- Copper layers
- 4
- Thickness
- 1.6 mm
- Parts
- 20
- Nets
- 55
- Pads
- 157
- Tracks, vias
- 485, 67
- Pours
- 2
- Routed
- Yes
- KiCad
- KiCad 6 (file 20211014)
- Created
- 20 Apr 2021
- Updated
- 9 Nov 2022
Overview
Flags Register is an open-source printed circuit board by Trilobyte-CPU, from the Trilobyte-CPU/8-bit-computer repository on GitHub. It is a 4-layer board of 42.7 × 39.4 mm with 20 parts on 55 nets, routed with 485 tracks and 67 vias.
It is built around the 74LS245SC, 74LS02PC and 74LS157PC, with the 74LS173SC, 74LS32SC and 74LS86 among its other parts. Its parts include 7 ICs, 4 resistors, 4 diodes, 3 capacitors and 2 connectors.
Main components
674LS245SC
-0℃~+70℃ 12ns@5V,45pF 15mA 24mA 4.75V~5.25V 74LS 8 Bidirectional Output enable Schmitt trigger Tri-State - Buffers, Drivers, Receivers, Transceivers ROHSTexas InstrumentsBuffers, Drivers, Receivers, Transceivers
74LS02PC
DIP-140℃~+70℃ 15ns@5V,15pF 2 2.7V 2V 4 4.75V~5.25V 400uA 500mV 74LS 800mV 8mA 8mA NOR Gate DIP-14 Logic Gates ROHSonsemiLogic Gates
74LS157PC
PDIP-160℃~+70℃ 4.75V~5.25V Single Supply PDIP-16 Signal Switches, Multiplexers, Decoders ROHSTexas InstrumentsSignal Switches, Multiplexers, Decoders74LS173SC
CDIP-160℃~+70℃ 10ns 10ns 28mA 30MHz 4 4.75V~5.25V 40ns@5V,15pF 74LS Series Asynchronous D-Type Reset Rising Edge Tri-State CDIP-16 Flip FlopsTexas InstrumentsFlip Flops
74LS32SC
-- Logic Gates ROHSTexas InstrumentsLogic Gates74LS86
DIP-14-20℃~+75℃ 10mA 2.7V 23ns@5V,15pF 2V 400mV 400uA 5V 74LS 800mV 8mA XOR Gate DIP-14 Logic Gates ROHSHITLogic Gates
Parts
20| Qty | Value | Footprint | References |
|---|---|---|---|
| 4 | LED | LED_SMD:LED_0805_2012Metric | D1, D2, D3, D4 |
| 4 | R_US | Resistor_SMD:R_0805_2012Metric | R1, R2, R3, R4 |
| 3 | C | Capacitor_SMD:C_0805_2012Metric | C1, C2, C3 |
| 1 | 74LS02 | Package_SO:TSSOP-14_4.4x5mm_P0.65mm | U36 |
| 1 | 74LS08 | Package_SO:TSSOP-14_4.4x5mm_P0.65mm | U37 |
| 1 | 74LS157 | Package_SO:TSSOP-16_4.4x5mm_P0.65mm | U38 |
| 1 | 74LS173 | Package_SO:TSSOP-16_4.4x5mm_P0.65mm | U1 |
| 1 | 74LS245 | Package_SO:TSSOP-20_4.4x6.5mm_P0.65mm | U2 |
| 1 | 74LS32 | Package_SO:TSSOP-14_4.4x5mm_P0.65mm | U35 |
| 1 | 74LS86 | Package_SO:TSSOP-14_4.4x5mm_P0.65mm | U39 |
| 1 | Conn_01x13 | Connector_PinHeader_2.54mm:PinHeader_1x13_P2.54mm_Vertical | J1 |
| 1 | Conn_01x14 | Connector_PinHeader_2.54mm:PinHeader_1x14_P2.54mm_Vertical | J2 |
Questions
How big is the Flags Register PCB?
It measures 42.7 × 39.4 mm and has 4 copper layers, 1.6 mm thick.
What parts does the Flags Register use?
20 parts, built around the 74LS245SC, 74LS02PC, 74LS157PC and 74LS173SC. The full list of its parts is on this page, with links to each part's symbol and footprint where PCBKit's library has them.
Where can I download the Flags Register KiCad files?
From the Trilobyte-CPU/8-bit-computer repository on GitHub, at the commit this page was made from: the board is PCBs/03_MODULES/CPU-ALU/ALU-Flags-Register/Flags Register.kicad_pcb. PCBKit opens the board in the browser, with nothing to install.
Can I use the Flags Register design in my own project?
Its repository states no licence, so its author keeps all rights: ask Trilobyte-CPU before reusing the design.
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