F3856 overview
F3856 is a component documented by Fairchild Semiconductor. The PDF description identifies it as "Program Storage Unit." This guide condenses the most useful engineering information from the available PDF so that designers and sourcing teams can identify the checks that still need confirmation in the original document.
Datasheet snapshot
- Manufacturer: Fairchild Semiconductor
- Part number: F3856
- Category: IC
- Datasheet length: 24 Pages
Specifications and operating details
The following points were extracted from the PDF text. Check the associated conditions, notes and limits in the complete document before using a value in a design.
- The inter- ‘© Low Power Dissipation, Typically Less Than 275 mW rupt logic responds to requests from an external device and = @ +5 Vand +12 V Power Supplies internally from the timer.
- The PSU devices are manufactured using N-channel, iso- planar MOS technology; therefore, power dissipation is very low, typically less than 275 mW.
- ROM Addressing port addresses are H'08, H'09, H'0A,, and H'0B. ‘The F3851 8K PSU has 1024 bytes of read-only memory; the ‘When a logic 1 is output to 1/0 port A or B, it places a0 V F3856 16K PSU has 2048 bytes.
- In some instances, the abil- When data is input, a high level at the base of transistor (c) ity to mask bits of a port to logic 1 is useful. (Note that logic causes (c) to conduct and pull point Y low, with current flow 1 becomes a 0 V ele.
- The output on the latches becomes true after typically 500 ns of the trailing edge of this signal.
- Bit 3 at2MHz | at2MHz 4, At the end of the pulse, the timer stops counting and 1 2 1s 256 us provides an external interrupt, indicating the end of the 1 8 4us 1.024 ms pulse.
- The timer contents can now be read under pro- Q 82 16 us 4.095 ms gram control for calculating the pulse width.
Engineering review checklist
- Confirm supply rails, clock limits, memory size, peripheral mapping and I/O voltage compatibility.
- Check package pinout, boot configuration, programming interface and silicon-revision errata.
- Budget decoupling, thermal margin, startup timing and firmware recovery behavior before release.
Always confirm values against the latest manufacturer-controlled datasheet, especially when qualifying a substitute or releasing a production BOM.
View the complete PDF and model record
Open the F3856 datasheet and model details to review the complete PDF, document pages and available product information.
Source attribution
Adapted from the PDF associated with this DigiCamel model page.
Source model URL: https://www.digicamel.com/product.php?slug=f3856-fairchild-semiconductor