Elexol 3rd Generation Low Cost
USB Data I/O Module
Need to get data into or out of a USB port? Here’s what you need...
• 24 independently programmable Input/Output pins grouped into 3 ports.
• Single module high-speed digital Input/Output solution.
• Up to 128 modules can be connected to a single PC with capabilities of
• Easy to connect by 0.1" pitch headers to suit standard IDC connectors.
• Integrated Type-B USB connector.
• On-board unique serial number in EEPROM and custom programmable
• Both USB enumeration information and microcontroller can be re-
programmed to suit customer needs.
• Module powered by the USB from the PC.
Just some of our range of USB and MP3 modules...
USB MOD3 - USB MOD4 - USB MOD5 - MP3 MOD4 -
USB Plug and Play Serial USB Plug and Play Parallel Integrated module based on the FTDI VS1001 chip. Converts
Development Module (2nd 8-bit FIFO Development Module FT2232C Dual Channel USB UART / clocked serial data (MP3) to
Gen). 1000k baud (RS232) and (2nd Gen). Up to 8 Million bits FIFO IC. Features two Multi-purpose stereo audio out. Suitable for
3000k baud. (RS422 / RS485) (1Megabyte) per second. controllers that can be configured in driving headphones.
several different modes.
Visit our website www.orteches.com
Ortech Education Systems
1119 - 9th Ave. S. • Moorhead, MN 56560
FIGURE 20. Functional diagram of the
74LS21 dual four-input AND gate IC.
FIGURE 21. Functional diagram of the 4082B
dual four-input AND gate IC.
four input TTL AND gates wired for
use as two input types. Note that
the fan-in of a TTL AND gate is an
almost constant 1, irrespective of
the number of inputs used. Thus,
CMOS or TTL AND gates can be
converted into non-inverting
buffers by simply shorting all of
their inputs together. Figure 24
shows examples of TTL AND gates
used as simple buffers.
A useful feature of AND gate ICs is
that their gates can be directly cascaded, with the output of one gate feeding
directly into one input of another gate,
to make compound AND gates with
any desired number of inputs. Figure
25, for example, shows how two input
FIGURE 23. Methods of
disabling unwanted TTL inputs,
to make a two-input AND gate.
disabling unwanted T TL
FIGURE 24. Methods of using
TTL AND gates as simple
AND gates can be cascaded
to make three, four, or five
input AND gates, and Figure
26 shows three three input or
two four input gates cascaded
to make a single seven input
AND gate. NV
FIGURE 25. Ways of using two input
AND gates to make (a) three input, (b)
four input, or (c) five input AND gates.
FIGURE 26. Ways of using (a) three
input or (b) four input AND gates to
make a seven input AND gate.