
Zx spectrum lower memory module
lostretrotapes/zx-spectrum-modern-memory
A work in progress to create a PCB to replace the upper and lower RAM chips in the 48k Spectrum with a modern replacement

The SN74ACT00NSR is a logic Gate made by Texas Instruments in a SO-14-208mil package with 14 pins. -40℃~+85℃ 2 20uA 24mA 24mA 3.7V、4.7V 4 4.5V~5.5V 500mV 74ACT 9.5ns@5V NAND Gate SO-14-208mil Logic Gates ROHS.
PCBKit's library has its KiCad symbol (74xx:7400, from KiCad's library) and its footprint (EasyEDA_Cloud:SOIC-14_L10.0-W5.5-P1.27-LS7.8-BL, from EasyEDA), ready for a KiCad board. JLCPCB lists it (part C2869425). 1 open-source board in 1 repository on GitHub use it.
| Pin | Name | Type |
|---|---|---|
| 1 | — | Input |
| 2 | — | Input |
| 3 | — | Output |
| 4 | — | Input |
| 5 | — | Input |
| 6 | — | Output |
| 7 | GND | Power in |
| 8 | — | Output |
| 9 | — | Input |
| 10 | — | Input |
| 11 | — | Output |
| 12 | — | Input |
| 13 | — | Input |
| 14 | VCC | Power in |

lostretrotapes/zx-spectrum-modern-memory
A work in progress to create a PCB to replace the upper and lower RAM chips in the 48k Spectrum with a modern replacement
<iframe src="https://pcbkit.io/embed/parts/ti/SN74ACT00NSR" title="SN74ACT00NSR in PCBKit" width="100%" height="480" style="border:0;border-radius:12px" allow="fullscreen" loading="lazy"></iframe><img src="https://pcbkit.io/embed/parts/ti/SN74ACT00NSR.jpg" alt="SN74ACT00NSR" width="1200" height="900">[](https://pcbkit.io/parts/ti/SN74ACT00NSR)Yes. The symbol is 74xx:7400 and the footprint EasyEDA_Cloud:SOIC-14_L10.0-W5.5-P1.27-LS7.8-BL, both drawn on this page. PCBKit places them on a board for you when you design with it.
SO-14-208mil, with 14 pins. Its footprint is drawn on this page.
Texas Instruments publishes it: the Datasheet link on this page opens it.
JLCPCB lists it as part C2869425, with 0 in stock; the sellers' links on this page open their listings.
Parts like it in the library: the CD4078BNSR by Texas Instruments, the SN74LS20NSR by Texas Instruments, the SN74HC20NSR by Texas Instruments and the SN74HC21NSR by Texas Instruments. Check their datasheets: a part that fits the footprint may still differ in its ratings.
1 board in 1 repository on GitHub; the most starred are listed on this page, with their KiCad files.