XC2C64A
Overview
The XC2C64A is a mid-range member of Xilinx's CoolRunner-II CPLD family, offering 64 macrocells in a compact, low-power package. As a non-volatile programmable logic device, it retains configuration when powered off and supports rapid in-system reprogramming. The device operates at 1.8V core voltage with 3.3V tolerant I/Os, making it suitable for mixed-voltage systems. Introduced in the early 2000s, the XC2C64A bridges the gap between discrete logic ICs and larger FPGAs. Its deterministic timing (pin-to-pin delays as fast as 3.5ns) and microwatt-level standby power consumption have made it popular for portable and always-on applications. The device is available in multiple packages including VQ44, QFG48, and CP56.
Structure and Working Principle
The XC2C64A architecture consists of four function blocks, each containing 16 macrocells with shared product terms. A programmable interconnect matrix routes signals between blocks, while I/O blocks handle voltage translation and three-state control. Each macrocell can implement combinatorial or registered logic with optional clock enable and reset controls. The device uses Xilinx's Advanced Interconnect Matrix (AIM) to provide predictable timing characteristics. Configuration is stored in Flash memory cells, allowing instant-on operation without external boot devices. During operation, the CPLD continuously monitors its inputs and generates outputs based on the programmed logic equations, typically consuming less than 100μA/MHz dynamic current.
Key Features
With 64 macrocells and up to 58 user I/Os (package-dependent), the XC2C64A provides sufficient density for bus interfacing, state machines, and simple data path control. Its 1.8V core voltage enables low dynamic power (typical ICC of 12mA at 25MHz), while 3.3V/2.5V I/O banks support legacy system integration. Notable features include hot-swap capability (I/O tolerance during power-up), data retention down to 1.5V, and IEEE 1532 compliant in-system programming. The device supports clock frequencies up to 200MHz and offers individual output slew rate control. Security features include bitstream encryption and a multi-level readback protection scheme to prevent IP theft.
Application Areas
In industrial systems, the XC2C64A commonly implements PLC signal conditioning, motor control logic, and sensor interface glue logic. Its deterministic timing makes it ideal for generating clean PWM signals or debouncing mechanical switches. Many automotive subsystems use it for LED matrix control and CAN bus message filtering. Consumer applications include HDMI/DVI level shifting, touch panel scanning logic, and power sequencing in set-top boxes. Telecom equipment employs the device for clock domain bridging and SD/SDIO card interface management. Medical devices leverage its low EMI characteristics for sensitive analog front-end control.
Maintenance and Precautions
While the XC2C64A requires no routine maintenance, designers should ensure power supply sequencing (core voltage before I/O voltage) to prevent latch-up. Unused inputs must be tied high or low to minimize current draw. The Flash memory withstands 10,000 program/erase cycles - for frequent reconfiguration, consider RAM-based alternatives. ESD precautions are critical - use grounded wrist straps when handling, and store in anti-static packaging. Thermal considerations are minimal (typical θJA of 40°C/W in VQ44 package), but sustained operation above 85°C ambient may require derating. For designs with frequent partial reconfiguration, monitor cumulative Flash wear using Xilinx's programming tools.
B2B Procurement Guide
When sourcing XC2C64A devices, verify package requirements (VQ44 for wave soldering, CP56 for space-constrained designs) and temperature grade (commercial 0°C to +70°C or industrial -40°C to +85°C). Lead times vary by distributor - authorized suppliers like Avnet and Arrow typically stock common variants, while grey market purchases risk counterfeit devices. Volume pricing breaks usually occur at 1k units, with additional discounts for tape-and-reel packaging. Consider purchasing ISE WebPACK licenses (free for small designs) or programming adapters for in-house configuration. For legacy system support, evaluate pin-compatible alternatives like Lattice's ispMACH 4000ZE family, though migration requires design retargeting.
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