ATF1504ASVL-20JU44 CPLD | High-Performance 3.3V In-System Programmable Logic Device
The ATF1504ASVL-20JU44 from Atmel (now Microchip) is a high-density Complex Programmable Logic Device (CPLD) designed for demanding embedded applications requiring flexible logic integration. This 3.3V device features 64 macrocells organized in Advanced Logic Blocks (ALBs), delivering 1,500 usable gates with a fast 20ns pin-to-pin propagation delay. The 44-pin PLCC package (J-lead) offers robust mechanical stability for surface-mount applications across industrial temperature ranges (-40 C to +85 C). With 32 programmable I/O pins supporting 24mA sink/source current, it enables direct interfacing with processors, memories, and peripheral ICs without additional buffers.
Engineered for reliability, the ATF1504ASVL-20JU44 supports 10,000 in-system programming (ISP) cycles via IEEE 1149.1 JTAG interface, allowing field updates without physical removal. The 3.3V core voltage (with 5V-tolerant I/Os) reduces power consumption by 40% compared to 5V CPLDs while maintaining 5V system compatibility. Advanced power management features include programmable output slew rate control (5-15ns) to minimize EMI in noise-sensitive applications. The architecture utilizes Atmel's proven 0.35 m CMOS process with 100% tested reprogrammability, ensuring consistent performance over the product lifecycle.
Key specifications include 5ns logic array delays, 100MHz maximum operating frequency, and zero standby current in power-down mode. The device integrates 4 dedicated clock pins with programmable polarity, plus global and product-term clocking options for complex state machine designs. Security features include 128-bit encryption and a programmable security bit to prevent unauthorized readback of configuration data. Development is supported by industry-standard tools like Atmel's WinCUPL and third-party synthesis tools with optimized macrocell libraries.
This CPLD excels in protocol bridging, glue logic consolidation, and control plane applications. Typical implementations include UART/SPI interface conversion in industrial PLCs, automotive ECU signal conditioning, and medical device state machine control. The 20ns deterministic timing makes it ideal for real-time systems requiring precise event response, while the 32 I/Os enable compact designs replacing multiple discrete logic ICs. Compared to FPGAs, it offers instant-on operation without configuration memory, making it suitable for critical boot management functions.
As an active product in Microchip's mature CPLD portfolio, the ATF1504ASVL-20JU44 combines proven reliability with modern power efficiency. The PLCC-44 package (16.6 16.6mm) is compatible with automated pick-and-place assembly, while the industrial temperature rating ensures operation in harsh environments. Designers benefit from 15+ years of field deployment across telecommunications infrastructure, test equipment, and aerospace systems. For legacy 5V designs, pin-compatible 5V versions (ATF1504ASV) are available, simplifying migration to lower power architectures.
