2 layers27.9 × 16.5 mm
2 layers51 × 64 mm
A bi-directional high-speed TTL-Compatible level shifter board 5V ⇄ 3V3 for tinkering
- Size
- 51 × 64 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 18
- Nets
- 64
- Pads
- 253
- Tracks, vias
- 623, 5
- Pours
- 2
- Routed
- Yes
- KiCad
- KiCad 5 (file 20171130)
- Created
- 9 Sep 2020
- Updated
- 14 Mar 2021
Overview
LLCB is an open-source printed circuit board by jbilander, from the jbilander/Logic-level-converter-board repository on GitHub, published under the GPL-2.0 licence. It is a 2-layer board of 51 × 64 mm with 18 parts on 64 nets, routed with 623 tracks and 5 vias.
It is built around the SN74CBTD16211DL. Its parts include 9 connectors, 2 capacitors, 1 resistor, 1 IC and 1 diode.
Main components
1README
README.mdLogic-level-converter-board
A bi-directional high-speed TTL-Compatible level shifter board 5V ⇄ 3V3 for tinkering
| PART | Value | Description |
|---|---|---|
| D1 | 2.54 mm pin pitch | LED Diode (optional Power on/off indicator) |
| R1 | 100-330 Ohm | 1206 (populate if D1, calculate suitable resistor value to use with D1) |
| C1 | 10-100 uF | 1210 |
| C2 | 0.1 uF | 1206 |
| U1 | SN74CBTD16211 https://www.ti.com/lit/ds/symlink/sn74cbtd16211.pdf | TSSOP-56_6.1x14mm_P0.5mm |
| Pushbutton switch SW_7x7x12mm_DPDT | ||
| Barrel Jack 5.5x2.1mm | ||
| Power +5V center pin positive or via pinheader (verify polarity before connecting) | ||
| 2.54 mm jumpers to enable/disable /1OE (first 12-bits) and /2OE (second 12-bits), either enable via jumper to GND or disable via VCC. | ||
| 2.54 mm jumpers to disable unused inputs via jumper to GND. | ||
| A lot of 2.54mm pinheader strips. |
Happy Tinkerin'
Parts
18| Qty | Value | Footprint | References |
|---|---|---|---|
| 2 | Conn_01x24 | Connector_PinHeader_2.54mm:PinHeader_1x24_P2.54mm_Vertical | J2, J4 |
| 2 | Conn_02x06_Odd_Even | Connector_PinHeader_2.54mm:PinHeader_2x06_P2.54mm_Vertical | J7, J8 |
| 2 | Conn_02x24_Odd_Even | Connector_PinHeader_2.54mm:PinHeader_2x24_P2.54mm_Vertical | J1, J3 |
| 2 | Jumper_3_Open | Connector_PinHeader_2.54mm:PinHeader_1x03_P2.54mm_Vertical | JP1, JP2 |
| 1 | Barrel_Jack_Switch | Connector_BarrelJack:BarrelJack_Horizontal | J5 |
| 1 | C | Capacitor_SMD:C_1206_3216Metric_Pad1.42x1.75mm_HandSolder | C2 |
| 1 | C | Capacitor_SMD:C_1210_3225Metric_Pad1.42x2.65mm_HandSolder | C1 |
| 1 | Conn_02x01 | Connector_PinHeader_2.54mm:PinHeader_2x01_P2.54mm_Vertical | J6 |
| 1 | Conn_02x02_Odd_Even | Connector_PinHeader_2.54mm:PinHeader_2x02_P2.54mm_Vertical | J9 |
| 1 | LED | LED_THT:LED_D3.0mm | D1 |
| 1 | R | Resistor_SMD:R_1206_3216Metric_Pad1.42x1.75mm_HandSolder | R1 |
| 1 | SN74CBTD16211 | Package_SO:TSSOP-56_6.1x14mm_P0.5mm | U1 |
| 1 | SW_Push_DPDT | Button_Switch_THT:SW_Push_THT_7x7x12mm_DPDT | SW1 |
The 17 most common of 18 parts.
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Questions
How big is the LLCB PCB?
It measures 51 × 64 mm and has 2 copper layers, 1.6 mm thick.
What parts does the LLCB use?
18 parts, built around the SN74CBTD16211DL. 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 LLCB KiCad files?
From the jbilander/Logic-level-converter-board repository on GitHub, at the commit this page was made from: the board is KiCad/LLCB.kicad_pcb. PCBKit opens the board in the browser, with nothing to install.
Can I use the LLCB design in my own project?
Its repository publishes it under the GPL-2.0 licence: you may reuse it on that licence's terms (keep the author's notice, and for a copyleft licence share your changes alike).