4 layers215 × 150 mm
Mackerel-30-proto
crmaykish/mackerel-68k
A series of single-board Motorola 68k computers with support for modern Linux
133 parts96MIT
Overview
The XR68C681J-F is an UART made by MaxLinear in a PLCC-44(16.59x16.59) package with 44 pins. 1Mbps 2 5V Timer/Counter、Internal Oscillator PLCC-44(16.59x16.59) UART ROHS.
PCBKit's library has its KiCad symbol (EasyEDA_Cloud:XR68C681CJ-F, from EasyEDA) and its footprint (EasyEDA_Cloud:PLCC-44_L16.6-W16.6-P1.27-LS17.5-T, from EasyEDA), ready for a KiCad board. JLCPCB lists it (part C1523639). 4 open-source boards in 2 repositories on GitHub use it.
Symbol
Footprint
Parameters
4- Data Rate(Max)
- 1Mbps
- Features
- Timer/Counter, Internal Oscillator, Low-power mode, Hardware flow control support
- Number of Channels
- 2
- Voltage - Supply
- 5V
Order codes
1- XR68C681J-FLCSC C1523639
Pinout
44| Pin | Name | Type |
|---|---|---|
| 1 | NC | Unspecified |
| 2 | A1 | Unspecified |
| 3 | IP3 | Unspecified |
| 4 | A2 | Unspecified |
| 5 | IN1 | Unspecified |
| 6 | A3 | Unspecified |
| 7 | A4 | Unspecified |
| 8 | IP0 | Unspecified |
| 9 | R#/W# | Unspecified |
| 10 | DTALK# | Unspecified |
| 11 | RXDB | Unspecified |
| 12 | NC | Unspecified |
| 13 | TXDB | Unspecified |
| 14 | OP1 | Unspecified |
| 15 | OP3 | Unspecified |
| 16 | OP5 | Unspecified |
| 17 | OP7 | Unspecified |
| 18 | D1 | Unspecified |
| 19 | D3 | Unspecified |
| 20 | D5 | Unspecified |
| 21 | D7 | Unspecified |
| 22 | GND | Unspecified |
| 23 | NC | Unspecified |
| 24 | INTR | Unspecified |
| 25 | D6 | Unspecified |
| 26 | D4 | Unspecified |
| 27 | D2 | Unspecified |
| 28 | D0 | Unspecified |
| 29 | OP6 | Unspecified |
| 30 | OP4 | Unspecified |
| 31 | OP2 | Unspecified |
| 32 | OP0 | Unspecified |
| 33 | TXDA | Unspecified |
| 34 | NC | Unspecified |
| 35 | RXDA | Unspecified |
| 36 | X1/CLK | Unspecified |
| 37 | X2 | Unspecified |
| 38 | RESET# | Unspecified |
| 39 | CS | Unspecified |
| 40 | IP2 | Unspecified |
| 41 | IACK# | Unspecified |
| 42 | IP5 | Unspecified |
| 43 | IP4 | Unspecified |
| 44 | VCC | Unspecified |
Open-source boards using it
All 4- 4 layers150 × 114 mm
Mackerel-10-v1
crmaykish/mackerel-68k
A series of single-board Motorola 68k computers with support for modern Linux
65 parts96MIT - 4 layers180 × 120 mm
Crmaykish mackerel-68k mackerel-08-v1
punkfab/pcb-corpus
235 real KiCad boards from open-source hardware repositories, prepared as a placement and routing benchmark
86 parts1 - 4 layers210 × 170 mm
Crmaykish mackerel-68k mackerel-10-v1
punkfab/pcb-corpus
235 real KiCad boards from open-source hardware repositories, prepared as a placement and routing benchmark
114 parts1
Show this part on your page
<iframe src="https://pcbkit.io/embed/parts/maxlinear/XR68C681J-F" title="XR68C681J-F in PCBKit" width="100%" height="480" style="border:0;border-radius:12px" allow="fullscreen" loading="lazy"></iframe><img src="https://pcbkit.io/embed/parts/maxlinear/XR68C681J-F.jpg" alt="XR68C681J-F" width="1200" height="900">[](https://pcbkit.io/parts/maxlinear/XR68C681J-F)Questions
Is there a KiCad symbol and footprint for the XR68C681J-F?
Yes. The symbol is EasyEDA_Cloud:XR68C681CJ-F and the footprint EasyEDA_Cloud:PLCC-44_L16.6-W16.6-P1.27-LS17.5-T, both drawn on this page. PCBKit places them on a board for you when you design with it.
What package is the XR68C681J-F?
PLCC-44(16.59x16.59), with 44 pins. Its footprint is drawn on this page.
Where is the XR68C681J-F datasheet?
MaxLinear publishes it: the Datasheet link on this page opens it.
Where can I order the XR68C681J-F?
JLCPCB lists it as part C1523639, with 0 in stock; the sellers' links on this page open their listings.
What can replace the XR68C681J-F?
Parts like it in the library: the ST16C2550IJ44-F by MaxLinear, the ST16C550CJ44-F by MaxLinear, the ST16C550CJ44TR-F by MaxLinear and the ST16C550IJ44-F by MaxLinear. Check their datasheets: a part that fits the footprint may still differ in its ratings.
Which open-source boards use the XR68C681J-F?
4 boards in 2 repositories on GitHub; the most starred are listed on this page, with their KiCad files.
Parts like it
8
ST16C2550IJ44-F
PLCC-44(16.59x16.59)16Byte 2 2.97V~5.5V 4Mbps RS-485、RS-232 Timer/Counter、Internal Oscillator、With False Start Bit Detection、with Modem Control PLCC-44(16.59x16.59) UART ROHSMaxLinearUARTST16C550CJ44-F
PLCC-44(16.59x16.59)0℃~+70℃ 1 1.2mA 1.5Mbps 16Byte 2.97V~5.5V Timer/Counter、With False Start Bit Detection、with Modem Control UART PLCC-44(16.59x16.59) UART ROHSMaxLinearUARTST16C550CJ44TR-F
PLCC-44(16.59x16.59)-40℃~+85℃ 1 1.2mA 1.5Mbps 16Byte 2.97V~5.5V Timer/Counter、With False Start Bit Detection、with Modem Control UART PLCC-44(16.59x16.59) UART ROHSMaxLinearUARTST16C550IJ44-F
PLCC-44(16.6x16.6)1 16Byte 2.97V~5.5V Timer/Counter、With False Start Bit Detection、with Modem Control PLCC-44(16.6x16.6) UART ROHSMaxLinearUARTXR16C2850CJTR-F
PLCC-44(16.59x16.59)128Byte 2 2.97V~5.5V 6.25Mbps RS-485、RS-232 Timer/Counter、Internal Oscillator、With False Start Bit Detection、with Modem Control、With automatic flow control、With IrDA Encoder/Decoder PLCC-44(16.59x16.59) UART ROHSMaxLinearUARTXR16C2852CJ-F
PLCC-44(16.6x16.6)128Byte 2 2.97V~5.5V Low-power mode、Hardware flow control support、Software flow control support、Internal loopback/self-test mode、Automatic RS-485 direction control PLCC-44(16.6x16.6) UART ROHSMaxLinearUARTXR16C2852IJ-F
PLCC-44(16.59x16.59)128Byte 2 2.97V~5.5V 3.125Mbps Internal Oscillator、With False Start Bit Detection、with Modem Control、With automatic flow control、With IrDA Encoder/Decoder、Hardware flow control support、Software flow control support、Fractional baud rate generator、Internal loopback/self-test mode、Automatic RS-485 direction control PLCC-44(16.59x16.59) UART ROHSMaxLinearUARTXR16C850CJ-F
PLCC-44(16.59x16.59)1 128Byte 2.97V~5.5V 2Mbps Printer Port、Timer/Counter、Internal Oscillator、With False Start Bit Detection、with Modem Control、With automatic flow control、With IrDA Encoder/Decoder、Hardware flow control support、Software flow control support、Automatic RS-485 direction control PLCC-44(16.59x16.59) UART ROHSMaxLinearUART