2 layers102.6 × 366 mm
Cpu input output control
Trilobyte-CPU/8-bit-computer
A DIY 8-bit computer built mostly with discrete logic chips
80 parts2
4 layers304.5 × 217.2 mm
Latest Full Backplane
Trilobyte-CPU/8-bit-computer2A DIY 8-bit computer built mostly with discrete logic chips
- Size
- 304.5 × 217.2 mm
- Copper layers
- 4
- Thickness
- 0.57 mm
- Parts
- 478
- Nets
- 527
- Pads
- 3,236
- Tracks, vias
- 13,048, 1,433
- Pours
- 12
- Routed
- Yes
- KiCad
- KiCad 6 (file 20211014)
- Created
- 20 Apr 2021
- Updated
- 9 Nov 2022
Overview
Latest Full Backplane 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 304.5 × 217.2 mm with 478 parts on 527 nets, routed with 13,048 tracks and 1,433 vias.
It is built around the 74LS245SC, 74HC245D and 74LS574N, with the 74LS193P-E, 74HC173D and 74LS32SC among its other parts. Its parts include 143 resistors, 128 ICs, 118 diodes, 50 capacitors and 35 connectors.
Main components
1274LS245SC
-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
74HC245D
SO-20-300mil-40℃~+125℃ 1 160uA 2V~6V 7.8mA 7.8mA 74HC 8 9ns@4.5V,50pF Bidirectional Tri-State SOIC-20-300mil Buffers, Drivers, Receivers, Transceivers ROHSNexperiaBuffers, Drivers, Receivers, Transceivers74LS574N
-0ns 0℃~+70℃ 1 2.6mA 20ns 24mA 28ns@5V,45pF 35MHz 4.75V~5.25V 74LS Series 8 D-Type Rising Edge Tri-State - Flip Flops ROHSRochester Electronics, LLCFlip Flops
74LS193P-E
DIP-1674LS Programmable divide ratio、Reset function、Cascade counter、Synchronous counting、Multi-mode counting DIP-16 Counters, Dividers ROHSRenesas ElectronicsCounters, Dividers
74HC173D
SOIC-16-40℃~+125℃ 1 2V~6V 3.5pF 30ns@6V,50pF 4 4uA 7.8mA 7.8mA 74HC Series 95MHz D-Type Reset Rising Edge SOP-16 Flip Flops ROHSNexperiaFlip Flops
74LS32SC
-- Logic Gates ROHSTexas InstrumentsLogic Gates
74LS86
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
74LS00SC
-0℃~+70℃ 15ns@5V,50pF 2 2.7V 2V 4 4.75V~5.25V 400uA 500mV 74LS 800mV 8mA NAND Gate - Logic Gates ROHSTexas InstrumentsLogic Gates
IS61C5128AS-25TLI
SOIC-32-10.2mm-40℃~+85℃ 15mA 25ns 4.5V~5.5V 4Mbit 900uA Auto power-down function Parallel Port (Parallel) SOIC-32-10.2mm SRAM ROHSISSISRAM74HC02
-- Logic Gates ROHSonsemiLogic Gates
74HC08D
SOP-14-40℃~+125℃ 1.5V~4.2V 1.9V、3.7V、5.2V 100mV、400mV 2 27ns@4.5V,50pF 2V~6V 2uA 4 5.2mA 5.2mA 500mV~1.8V 74HC Series AND Gate SOIC-14 Logic Gates ROHSNexperiaLogic Gates74LS04PC
PDIP-140℃~+70℃ 4.75V~5.25V 6 6.6mA 74LS PDIP-14 InvertersonsemiInverters
Parts
478| Qty | Value | Footprint | References |
|---|---|---|---|
| 76 | LED | LED_SMD:LED_0805_2012Metric | D1, D1, D1, D1, D10, D10, D10, D11, D11, D12, D12, D13, D13, D14, D15, D16 +60 |
| 56 | R_US | Resistor_SMD:R_0805_2012Metric | R1, R1, R1, R1, R2, R2, R2, R10, R11, R12, R13, R14, R15, R18, R19, R20 +40 |
| 54 | R_Small | Resistor_SMD:R_0805_2012Metric | R1, R1, R10, R10, R11, R11, R12, R12, R13, R13, R14, R14, R15, R15, R16, R16 +38 |
| 48 | C | Capacitor_SMD:C_0805_2012Metric | C1, C1, C1, C1, C1, C1, C1, C1, C1, C1, C2, C2, C2, C2, C2, C2 +32 |
| 42 | LED | LED_SMD:LED_1206_3216Metric | D1, D1, D10, D10, D11, D11, D12, D12, D13, D13, D14, D14, D15, D15, D16, D16 +26 |
| 33 | R_Small_US | Resistor_SMD:R_0805_2012Metric | R1, R10, R10, R10, R11, R11, R11, R12, R12, R12, R13, R13, R13, R14, R14, R15 +17 |
| 18 | 74LS574 | Package_SO:SO-20_5.3x12.6mm_P1.27mm | U1, U1, U1, U2, U4, U4, U4, U4, U5, U6, U6, U6, U7, U12, U13, U14 +2 |
| 17 | 74LS245 | Package_SO:TSSOP-20_4.4x6.5mm_P0.65mm | U1, U2, U5, U5, U6, U6, U7, U8, U9, U10, U11, U11, U15, U16, U17, U18 +1 |
| 10 | Conn_01x08 | Connector_PinHeader_2.54mm:PinHeader_1x08_P2.54mm_Vertical | J1, J1, J1, J1, J2, J2, J2, J3, J3, J4 |
| 8 | 74LS08 | Package_SO:TSSOP-14_4.4x5mm_P0.65mm | U1, U1, U2, U3, U4, U9, U33, U37 |
| 8 | 74LS193 | Package_SO:SO-16_5.3x10.2mm_P1.27mm | U2, U2, U3, U3, U5, U5, U7, U7 |
| 6 | 74HC173 | Package_SO:SO-16_3.9x9.9mm_P1.27mm | U12, U13, U16, U17, U20, U21 |
| 6 | 74HC245 | Package_SO:SO-20_12.8x7.5mm_P1.27mm | U14, U15, U18, U19, U22, U23 |
| 6 | Conn_01x16 | Connector_PinHeader_2.54mm:PinHeader_1x16_P2.54mm_Vertical | J2, J2, J2, J3, J3, J3 |
| 5 | 74LS32 | Package_SO:TSSOP-14_4.4x5mm_P0.65mm | U3, U4, U5, U34, U35 |
| 5 | 74LS86 | Package_SO:TSSOP-14_4.4x5mm_P0.65mm | U3, U4, U7, U8, U39 |
| 4 | 74LS00 | Package_SO:TSSOP-14_4.4x5mm_P0.65mm | U7, U8, U20, U21 |
| 4 | Conn_01x08 | Connector_PinSocket_2.54mm:PinSocket_1x08_P2.54mm_Vertical | J1, J2, J4, J6 |
| 4 | Conn_01x11 | Connector_PinHeader_2.54mm:PinHeader_1x11_P2.54mm_Vertical | J3, J3, J4, J4 |
| 4 | IS61C5128AS-25TLI | Package_SO:TSOP-II-32_21.0x10.2mm_P1.27mm | U4, U5, U6, U7 |
| 3 | 74HC02 | Package_SO:TSSOP-14_4.4x5mm_P0.65mm | U2, U5, U9 |
| 3 | 74HC08 | Package_SO:TSSOP-14_4.4x5mm_P0.65mm | U3, U6, U14 |
| 3 | 74LS04 | Package_SO:TSSOP-14_4.4x5mm_P0.65mm | U2, U12, U32 |
| 3 | 74LS138 | Package_SO:TSSOP-16_4.4x5mm_P0.65mm | U2, U3, U19 |
| 3 | 74LS157 | Package_SO:TSSOP-16_4.4x5mm_P0.65mm | U1, U2, U38 |
| 3 | Conn_01x07 | Connector_PinHeader_2.54mm:PinHeader_1x07_P2.54mm_Vertical | J1, J3, J3 |
| 2 | 74HC04 | Package_SO:TSSOP-14_4.4x5mm_P0.65mm | U1, U4 |
| 2 | 74HC161 | Package_SO:SOIC-16_3.9x9.9mm_P1.27mm | U3, U10 |
| 2 | 74HC173 | Package_SO:SOIC-16_3.9x9.9mm_P1.27mm | U8, U9 |
| 2 | 74HC245 | Package_SO:SOIC-20W_7.5x12.8mm_P1.27mm | U6, U7 |
| 2 | 74HC32 | Package_SO:TSSOP-14_4.4x5mm_P0.65mm | U7, U12 |
| 2 | 74HC574 | Package_SO:SO-20_5.3x12.6mm_P1.27mm | U9, U10 |
| 2 | 74LS283 | Package_SO:SOIC-16W_5.3x10.2mm_P1.27mm | U5, U6 |
| 2 | CD4072 | Package_SO:SOIC-14_3.9x8.7mm_P1.27mm | U10, U11 |
| 2 | Conn_01x13 | Connector_PinHeader_2.54mm:PinHeader_1x13_P2.54mm_Vertical | J1, J2 |
| 1 | 4072 | Package_SO:SO-14_3.9x8.65mm_P1.27mm | U2 |
| 1 | 4072 | Package_SO:SOIC-14_3.9x8.7mm_P1.27mm | U2 |
| 1 | 74HC00 | Package_SO:TSSOP-14_4.4x5mm_P0.65mm | U1 |
| 1 | 74HC04 | Package_SO:SOIC-14_3.9x8.7mm_P1.27mm | U1 |
| 1 | 74HC08 | Package_SO:SOIC-14_3.9x8.7mm_P1.27mm | U5 |
| 1 | 74HC139 | Package_SO:TSSOP-16_4.4x5mm_P0.65mm | U3 |
| 1 | 74HC154 | Package_SO:SOIC-24W_7.5x15.4mm_P1.27mm | U13 |
| 1 | 74HC245 | Package_SO:TSSOP-20_4.4x6.5mm_P0.65mm | U8 |
| 1 | 74HC32 | Package_SO:SOIC-14_3.9x8.7mm_P1.27mm | U4 |
| 1 | 74HC640 | Package_SO:SO-20_5.3x12.6mm_P1.27mm | U6 |
| 1 | 74HC86 | Package_SO:TSSOP-14_4.4x5mm_P0.65mm | U8 |
| 1 | 74LS02 | Package_SO:TSSOP-14_4.4x5mm_P0.65mm | U36 |
| 1 | 74LS154 | Package_SO:SOIC-24W_7.5x15.4mm_P1.27mm | U3 |
| 1 | 74LS173 | Package_SO:TSSOP-16_4.4x5mm_P0.65mm | U1 |
| 1 | 74LS21 | Package_SO:SOIC-14_3.9x8.7mm_P1.27mm | U10 |
| 1 | C_Polarized | Capacitor_SMD:CP_Elec_5x5.9 | C5 |
| 1 | C_Polarized_US | Capacitor_THT:CP_Radial_D4.0mm_P2.00mm | C5 |
| 1 | Conn_01x04 | Connector_PinHeader_2.54mm:PinHeader_1x04_P2.54mm_Vertical | J4 |
| 1 | Conn_01x09 | Connector_PinHeader_2.54mm:PinHeader_1x09_P2.54mm_Vertical | J4 |
| 1 | Conn_01x12 | Connector_PinSocket_2.54mm:PinSocket_1x11_P2.54mm_Vertical | J5 |
| 1 | Conn_01x13 | Connector_PinSocket_2.54mm:PinSocket_1x13_P2.54mm_Vertical | JC |
| 1 | Conn_01x14 | Connector_PinHeader_2.54mm:PinHeader_1x14_P2.54mm_Vertical | J2 |
| 1 | Conn_01x16 | Connector_PinSocket_2.54mm:PinSocket_1x16_P2.54mm_Vertical | J1 |
| 1 | PLCC32_28_28C256 | Stephenv6:PLCC-32-SOCKET-Microchip-32J-10_2001-B-IPC_A | U11 |
| 1 | SW_Push | Button_Switch_THT:SW_PUSH_6mm | SW1 |
| 1 | Screw_Terminal_01x02 | TerminalBlock_Phoenix:TerminalBlock_Phoenix_MPT-0,5-2-2.54_1x02_P2.54mm_Horizontal | J4 |
The 476 most common of 478 parts.
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Questions
How big is the Latest Full Backplane PCB?
It measures 304.5 × 217.2 mm and has 4 copper layers, 0.57 mm thick.
What parts does the Latest Full Backplane use?
478 parts, built around the 74LS245SC, 74HC245D, 74LS574N and 74LS193P-E. 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 Latest Full Backplane KiCad files?
From the Trilobyte-CPU/8-bit-computer repository on GitHub, at the commit this page was made from: the board is PCBs/99_IN PROGRESS/Latest-Full-Backplane/Latest-Full-Backplane.kicad_pcb. PCBKit opens the board in the browser, with nothing to install.
Can I use the Latest Full Backplane design in my own project?
Its repository states no licence, so its author keeps all rights: ask Trilobyte-CPU before reusing the design.