You want to use the XC2C256-7TQ144C. It is a complex programmable logic device from Xilinx. This cpld works fast and uses little power. It is made to work with a 1.8V supply. You get 256 macrocells and 16 logic elements. There are up to 118 I/O pins. This makes it good for many programmable logic device designs. The device has a short delay time of 6.7 ns. It also lets you program it while it is in the system. This helps you build circuits that work well. This cpld is now obsolete. You should always check the datasheet for correct Pinout and technical facts.
Here is a quick look at the main specifications for this cpld:
| Specification | Details |
|---|---|
| Macrocells | 256 |
| Logic Elements | 16 |
| I/O Pins | 118 |
| Voltage Supply | 1.7V ~ 1.9V |
| Delay Time (Max) | 6.7 ns |
Key Takeaways
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The XC2C256-7TQ144C CPLD has 256 macrocells and 118 I/O pins. This makes it good for many programmable logic designs.
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This CPLD uses a low power supply of 1.8V. It has a quiescent current of just 13 µA. This helps save energy in projects.
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You program the XC2C256-7TQ144C with the JTAG interface. This lets you update it on the board without taking it out.
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Always check the datasheet for correct pinout and specifications. This helps you avoid mistakes in your design.
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The XC2C256-7TQ144C is not made anymore, but it is still helpful. People use it for glue logic and state machines in electronics projects.
Pinout
Pin Arrangement
You will find the XC2C256-7TQ144C CPLD in a TQFP-144 package. This means the chip has 144 pins arranged around its four sides. Each pin has a specific job. Some pins supply power, some connect to ground, and others let you program or use the device. The pinout for this CPLD spreads the user I/O pins evenly. This helps you route signals easily on your circuit board.
The TQFP-144 package keeps the chip flat and easy to mount. You can see the pin numbers marked on the package. The power pins (VCC, VCCIO1, VCCIO2, VAUX) and ground pins (GND) sit at key spots to keep the device stable. The JTAG pins (TDI, TDO, TMS, TCK) group together for easy access during programming. Most of the other pins serve as user I/O. You can use these for inputs or outputs in your design.
Here is a simple table to help you understand the main pin types:
| Pin Type | Description |
|---|---|
| Power Pins | VCC, VCCIO1, VCCIO2, VAUX, GND |
| JTAG Pins | TDI, TDO, TMS, TCK |
| User I/O Pins | Configurable as inputs or outputs, evenly distributed for flexible routing |
Tip: Always check the datasheet for the full pinout and exact pin numbers. This helps you avoid mistakes in your design.
Pin Functions
You can use the XC2C256-7TQ144C CPLD pins in many ways. The power pins give the chip the voltage it needs to work. VCC and VAUX supply the main power. VCCIO1 and VCCIO2 let you set the voltage for different groups of I/O pins. GND pins connect to ground and keep the device stable.
The JTAG pins help you program and test the CPLD. TDI (Test Data In), TDO (Test Data Out), TMS (Test Mode Select), and TCK (Test Clock) form the JTAG interface. You use these pins to load your logic design into the chip.
Most of the pins are user I/O. You can set these as inputs or outputs. This gives you a lot of freedom in your circuit. The pinout lets you connect switches, LEDs, sensors, or other chips. The even spread of user I/O pins makes routing signals on your board much easier.
You should always plan your pin configuration before you start wiring your board. This helps you avoid crossing wires and keeps your design neat. The datasheet gives you a full list of pin numbers and their functions. You can use this list to double-check your work.
Note: The XC2C256-7TQ144C pinout supports flexible logic designs. You can change the function of most pins through your programming tools.
CPLD Features
Logic Resources
You get many useful features when you use the XC2C256-7TQ144C cpld from xilinx. This cpld gives you 256 macrocells and 16 logic elements. These features help you build complex circuits. The cpld has eight function blocks. Each block lets you create different logic functions. You can use the Advanced Interconnect Matrix (AIM) to connect these blocks. This feature makes your design flexible. The cpld also supports 40 true and complementary outputs. These features help you drive signals in both directions. Fast pin-to-pin delays, as low as 5.7 ns, make your circuits respond quickly. You can count on these features for high-speed designs.
Power and Voltage
The cpld works best with a 1.8V supply. This feature helps you save power. The cpld uses very little current when it is not active. You see a quiescent current of only 13 µA. This is one of the lowest in the industry. You can use this feature to build energy-saving devices. The cpld also supports different I/O voltages. You can set the voltage for each group of pins. This feature gives you more control over your design.
- The XC2C256-7TQ144C cpld has a quiescent current of 13 µA, which is noted as one of the lowest in the industry.
You should also know the commercial operating range for this cpld. This feature tells you the safe temperature for the device. You can see the range in the table below:
| Operating Temperature | 0 °C ~ 70 °C (TA) |
This feature helps you keep your cpld reliable in normal working conditions. If you use the cpld outside this range, you may see problems.
I/O Standards
The cpld supports many I/O standards. This feature lets you connect the cpld to other chips easily. You can use the cpld with both 1.8V and 3.3V logic. The cpld features flexible pin assignments. You can set each pin as an input or output. This feature helps you match the cpld to your circuit needs. The cpld also supports in-system programming. This feature lets you update your design without removing the chip. You get all these features in a small TQFP-144 package from xilinx. These features make the cpld a good choice for many projects, even though it is now obsolete.
Note: Always check the datasheet for the latest features and details before you start your design.
Specifications
You should know the main specifications before using the XC2C256-7TQ144C CPLD. These details help you design your circuit and stop mistakes. The datasheet has all the important facts, but this section gives you a simple summary.
Electrical Specs
Check the electrical specifications first. These tell you how much power the CPLD needs and how it works with other parts. The device uses a core voltage of 1.8V. You can set the I/O voltage to 1.5V, 1.8V, 2.5V, or 3.3V. This depends on what your system needs. The typical quiescent current is only 13 µA. This means the chip saves energy when it is not working. The highest supply current changes based on your logic design and how many pins you use.
| Parameter | Value |
|---|---|
| Core Voltage | 1.7V – 1.9V |
| I/O Voltage | 1.5V – 3.3V |
| Quiescent Current | 13 µA (typical) |
| Max I/O Pins | 118 |
Tip: Always use a power supply that matches these numbers. This keeps your CPLD safe.
Timing Specs
Timing specifications show how fast your CPLD can work. The pin-to-pin delay can be as low as 5.7 ns. This means signals move quickly through the device. The clock-to-output time is also short. Your circuit can respond fast. Use these timing numbers to plan your logic and avoid timing mistakes.
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Pin-to-pin delay: 5.7 ns (typical)
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Maximum operating frequency: 263 MHz
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Setup time: 1.7 ns
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Hold time: 0 ns
You can find more timing details in the datasheet if you need them.
Environmental Ratings
You must check the environmental specifications to make sure your CPLD works in your project. The XC2C256-7TQ144C works in a temperature range from 0°C to 70°C. The device can handle normal humidity in most labs and offices. Do not use this CPLD in very hot or cold places. Always follow these numbers to keep your design working well.
| Parameter | Value |
|---|---|
| Operating Temperature | 0°C to 70°C |
| Storage Temperature | -65°C to 150°C |
| Humidity | 5% to 95% RH |
Note: Always check the datasheet for all the specifications before you finish your design.
Programming
Methods
You can program the XC2C256-7TQ144C cpld using several methods. The most common way is through the JTAG interface. This method lets you load your logic design into the cpld while it stays on your board. You do not need to remove the chip for programming. You can also use in-system programming, which means you update the cpld without taking apart your project. This makes the programming process fast and easy.
Tip: Always program the cpld within the recommended temperature and voltage ranges. This keeps your device safe and working well.
Tools
You need the right tools for programming the cpld. The main tool is the Xilinx ISE software. This software lets you create your logic design and prepare it for the cpld. You also need a JTAG cable, such as the Xilinx Platform Cable USB. This cable connects your computer to the cpld. Some users choose third-party JTAG programmers, but you should check if they support the XC2C256-7TQ144C.
| Tool | Purpose |
|---|---|
| Xilinx ISE | Design and programming |
| JTAG Cable | Connects PC to cpld |
| Power Supply | Provides correct voltage |
Steps
Follow these steps for programming the cpld:
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Open Xilinx ISE and create your logic design.
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Compile your design and generate the programming file.
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Connect the JTAG cable to your cpld and computer.
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Power up your board with the correct voltage.
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Use the ISE software to start the programming process.
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Wait for the software to confirm that programming is complete.
Note: Always double-check your connections before you start programming.
Troubleshooting
If you have problems during programming, check these things first:
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Make sure the cpld has the correct power supply.
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Check all JTAG connections for loose wires.
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Confirm that you use the right programming file.
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Try a different USB port or cable if the cpld does not respond.
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Restart the Xilinx ISE software if you see errors.
If you still have trouble, look at the cpld datasheet or visit the Xilinx support forums. You can often solve programming issues by following these simple checks.
Applications
Use Cases
You can use the XC2C256-7TQ144C cpld in many types of electronic projects. This cpld works well when you need to control signals or make custom logic circuits. Many engineers use this device for glue logic. Glue logic helps connect different chips on a board. You can also use the cpld for address decoding in memory systems. This makes sure each part of your circuit talks to the right place.
Some people use this cpld for simple state machines. State machines help control steps in a process, like turning on lights in order. You can also use the cpld to replace older logic chips. This helps you save space and power on your board. The cpld from xilinx fits well in test equipment, communication devices, and industrial controls.
Tip: If you need to update your logic after building your board, the cpld lets you reprogram it without removing it.
Example Designs
You can find many example designs that use the XC2C256-7TQ144C cpld. Here are some ideas to help you get started:
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LED Controller: Use the cpld to turn LEDs on and off in a pattern.
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Signal Multiplexer: Build a circuit that chooses one signal from many inputs.
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Custom Timer: Make a timer that counts and sends signals at set times.
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Bus Interface: Connect two different data buses using the cpld as a bridge.
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Simple Arithmetic Unit: Create a small math circuit for adding or subtracting numbers.
You can use xilinx tools to design and test these circuits. Many online resources show step-by-step guides for these projects. Try starting with a simple design and then add more features as you learn.
Note: Always check your design with a simulation before programming the cpld. This helps you find mistakes early.
Advantages & Disadvantages
Benefits
There are many good things about using the XC2C256-7TQ144C cpld in your project. This chip uses Fast Zero Power technology, so it saves energy. You can use it in battery-powered gadgets or portable tools. The chip lets you put lots of logic on one device. You can make finite state machines and timing circuits easily. This makes it simple to solve many logic problems with just one chip.
Another great thing is that it starts working right away. The non-volatile design means the cpld works as soon as you turn it on. You do not have to wait for it to set up. This is helpful for systems that need to work fast.
Here is a table that lists the main benefits:
| Advantage | Description |
|---|---|
| Low Power Consumption | Uses Fast Zero Power technology for energy savings. |
| Integration Capabilities | Handles state machines and timing control for flexible designs. |
| Immediate Activation | Non-volatile design allows instant logic control after power-up. |
Tip: This cpld is great for projects that need to start quickly and use little power.
Limitations
You should know about the limits before picking the XC2C256-7TQ144C cpld. It has less logic space than bigger cplds or FPGAs. You cannot use it for very big or complex designs. The cpld does not have DSP, RAM, or fast transceivers built in. If you need those, you must pick a different chip.
This cpld is getting old, so it may be hard to find new ones soon. It does not work as fast as some other chips. You might see problems if you try to use it for very high-speed jobs. It is also not as flexible for tricky or odd designs.
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Smaller logic space than bigger cplds or FPGAs
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No built-in DSP, RAM, or fast transceivers
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Harder to find as it gets older
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Not as fast for high-speed projects
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Less flexible for tricky or odd designs
Note: Always think about what your project needs before you choose this cpld. If you need more features or speed, you should look at other chips.
Packaging
TQFP-144 Details
You will find the XC2C256-7TQ144C CPLD in a TQFP-144 package. TQFP stands for Thin Quad Flat Package. This type of package has leads on all four sides. The TQFP-144 package makes the chip easy to mount on your circuit board. You can use surface-mount technology to attach it. This helps you save space and keep your design neat.
The TQFP-144 package has 144 pins. These pins spread out evenly around the chip. You can connect many signals to your CPLD. The package is thin and flat, so it fits well in slim devices. You can see the size and shape in the table below:
| Specification | Value |
|---|---|
| Number of Pins | 144 |
| Package Height (Max) | 1.4 mm |
| Package Thickness (Nominal) | 1.0 mm |
| Lead Length | 0.45 mm ~ 0.75 mm |
| Lead Width | 0.17 mm ~ 0.27 mm |
| Mounting Type | Surface Mount |
| Supplier Device Package | 144-TQFP (20 × 20) |
Tip: The TQFP-144 package measures 20 mm by 20 mm. This size helps you plan your PCB layout.
You should handle the chip carefully. The leads are thin and can bend if you press too hard. Always use the right tools when you place the chip on your board.
Part Number
You can find the right chip by looking at the part number. The part number for this CPLD is XC2C256-7TQ144C. Each part of this code gives you important information:
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XC2C256: This shows the family and the number of macrocells (256).
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7: This number tells you the speed grade. A lower number means a faster chip.
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TQ144: This means the chip uses a TQFP package with 144 pins.
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C: This letter shows the commercial temperature range.
When you order or search for this CPLD, use the full part number. This helps you get the exact chip you need for your project.
Note: Always double-check the part number before you buy. This makes sure you get the right package and features for your design.
Datasheet
You can get the official datasheet for the XC2C256-7TQ144C CPLD online. The datasheet has all the technical facts you need for your project.
These files help you check pinouts, voltage, and package details. The datasheet also explains how to connect and program the CPLD.
Reading Tips
Read the datasheet closely so you do not make mistakes. Start with the product overview. This part tells you the main features and what the CPLD can do. Next, look at the pin setup and electrical specs. These pages help you set up power and connect signals.
The table below lists important sections you should look at:
| Product Attribute --- Attribute Value | | --- --- | | Manufacturer --- AMD Xilinx | | Voltage Supply (Internal) --- 1.7V ~ 1.9V | | Package / Case --- 144-LQFP | | Supplier Device Package --- 144-TQFP (20x20) | | Series --- CoolRunner II | | Number of Macrocells --- 256 | | Number of I/O --- 118 | | Max Delay Time tpd(1) --- 6.7 ns |
You should also look at the timing diagrams and programming steps. These parts show how fast the CPLD works and how to load your logic design. If you want to use the CPLD in controls, cars, or electronics, check for application notes in the datasheet.
Tip: Use bookmarks or notes to mark important pages in the datasheet. This helps you find key information fast when you need it.
The datasheet helps you compare good and bad points. The CPLD uses little power, works fast, and is easy to program. You should also notice the small temperature range and make sure your project fits these limits.
You now know the basics of the XC2C256-7TQ144C CPLD.
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The Advanced Interconnect Matrix lets you place logic in many ways.
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You get 256 macrocells and can program it with JTAG.
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Programming uses design steps like making your logic, placing it, and loading with JTAG.
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The datasheet gives you all the details and programming tips.
To keep going, do these steps:
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Make your logic and get it ready for this CPLD.
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Put your logic into macrocells and make your design better.
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Create the file you need for programming.
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Use JTAG to put your design onto the chip.
Always check the datasheet for help and for older projects.
Written by Jack Elliott from AIChipLink.
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