74LSN from Signetics High Technology, Inc.. Find the PDF Datasheet, Specifications and Distributor Information. Ordering information. 74HC; 74HCT Dual 2-to-4 line decoder/ demultiplexer. Rev. 4 — 11 December Product data sheet. Table 1. Ordering. These Schottky-clamped circuits are designed to be used in high-performance memory-decoding or data-routing appli- cations requiring very short propagation .

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Motherboard schematic for the original Nintendo Entertainment System. Completed netting of all pins attached to IC’s U1 – U Questionable assignments on a few pins though, would like review some more.

Nintendo’s custom pin expansion header has been replaced with a 50 pin ribbon cable connector. Currently the CIC host reset line is wired to expansion pin Need to check if the NPN transistor I used in the schematic is a valid substitute for what Nintendo used.

Both console and cartridge chips. I need to go back and change the package size used in CIC clk circuit.

74LSN Datasheet catalog

I’m numbering the passive components as I add them to my schematic, for now disregarding the numbering system obtained from the old schematics see my research post.


As is, the design is a hybrid of the famicom and NES. So really I’ve building a clone motherboard that requires 4 of the original chips: CIC chip optional All of the other parts I find equivalents for, with the criteria that mouser.

Eventually I’d like to create forks of the schematic, one faithful to the famicom, one faithful to the NES, and various other ones integrating mods. That being said once the hybrid schematic is complete I’ll probably start playing with the board layout of my clone first, and shelve the reference schematic 74ls1139n for later.

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Regarding the CIC lockout chip. In this scenario the CIC, which is wired to the physical reset switch, will still reset the CPU when it senses that the reset button is pushed. I had considered omitting the CIC completely but I think it could be re-purposed. It was intended to be a DRM mechanism, but it also ended up being a mechanism that wouldn’t allow you to play games with possibly bad cartridge connections.


I’d like to turn it into a mechanism that merely indicates a connection issue, one that still allows you to play despite the warning.

(PDF) SN74LS139N Datasheet download

They protect the CPU and hex inverters from damage while plugging in controllers. Each controller port is connected to two of the arrays.

I beleive I have found a replacement part that combines both array types into a single package. So we only need one array per controller port now.

74ls datasheet & applicatoin notes – Datasheet Archive

About Us Contact Hackaday. Resistors RM1 10K 11x 12x? IC1 30p C1 0. P6 av out P7 usb power port P8 60 pin famicom cartridge connector P9 famicom expansion port P10 mic in? The following pins are not connected to dstasheet Both console and cartridge chips I need to go back and change the package size used in CIC clk circuit. Parts added in update: SOT23 aka TO eagle part substitute: