EPM3256AQC208-7 - 256 Macro Cell 5K Gate MAX 3000A CPLD | Altera
MPN: EPM3256AQC208-7 ✓ Hoạt độngEPM3256AQC208-7 Tóm tắt
A Complex Programmable Logic Device (CPLD) is a non-volatile, electrically erasable programmable logic device that combines multiple PAL-like logic blocks on a single die with a central interconnect matrix. CPLDs sit in the programmable logic hierarchy between small SPLDs (Simple PLDs like PALs/GALs) and larger FPGAs, offering deterministic timing, instant-on behavior from on-chip EEPROM, and high-drive I/O capability — making them ideal for glue logic, bus bridging, and control-plane functions where predictable timing is critical.
Key features of the EPM3256AQC208-7 include 4.5 ns pin-to-pin logic delays (at the -10 speed grade; this -7 grade is 7.5 ns), counter frequencies up to 126.6 MHz, IEEE Std. 1532-compliant in-system programmability (ISP) via a 3.3 V interface, and 16 Logic Array Blocks (LABs) interconnected by a Programmable Interconnect Array (PIA). The 208-PQFP package is a 28 mm x 28 mm surface-mount plastic quad flat pack rated for 0 °C to 70 °C commercial temperature operation. The architecture combines macro cell flip-flops with shared logic expanders, allowing designers to implement up to 256 logic functions with up to 16 product terms per macro cell.
Typical applications include bus interface bridging, peripheral control, address decoding, state-machine implementation, and configuration logic for FPGA-based systems where instant-on, non-volatile storage of logic is required. The MultiVolt I/O supports mixed-voltage designs without external level shifters.
When designing with this part, note that the AQC suffix indicates the commercial 0-70 °C grade in PQFP packaging. Verify PCB footprint compatibility against the 208-PQFP land pattern before layout. For new designs, the MAX II family (EPM240, EPM570) is the modern recommended successor.
This page synthesizes distributor pricing, drop-in alternatives from the same MAX 3000A family, and practical design notes not consolidated on the manufacturer datasheet.
Bộ thay thế dễ dàng lắp đặt cho EPM3256AQC208-7 — cùng gói, chân-to-chân tương thích. Các bộ phận yêu cầu hàn PCB bị loại trừ.
Các biến thể trong loạt này
Các mẫu cùng loạt có thể lắp đặt dễ dàng tương thích với EPM3256AQC208-7 (cùng hình factor và footprint) — khác nhau ở Operating Temperature, Package, Usable Gates, User I/Os, Device Type.
EPM3256AQC208-10N
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →EPM3256AQC208-10
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →EPM3256AQC208-7N
✅ Drop-In ⚠️ Thông số chưa được xác minhLiên hệ để biết giá
Xem tài liệu →EPM3256AQC208-7 Tỷ lệ tối đa & tính chất điện
| Manufacturer | Altera (now Intel FPGA) |
| Series | MAX 3000A |
| Programmable Type | In-System Programmable (EEPROM) |
| Number of Macrocells | 256 |
| Number of Logic Elements / Blocks | 16 LABs |
| Number of Usable Gates | 5,000 |
| Number of I/O Pins | 158 - 161 |
| Propagation Delay (tpd) | 7.5 ns max |
| Maximum Counter Frequency | 126.6 MHz |
| Supply Voltage - Internal | 3.0 V to 3.6 V (3.3 V nominal) |
| I/O Logic Level Compatibility | 5.0 V / 3.3 V / 2.5 V (MultiVolt) |
| Nhiệt độ hoạt động | 0 °C to 70 °C (Commercial) |
| Kiểu lắp đặt | Surface Mount |
| Hộp / Vỏ | 208-BFQFP (PQFP-208, 28x28 mm) |
| Supplier Device Package | 208-PQFP |
| ISP Standard | IEEE Std. 1532 |
| Process Technology | CMOS EEPROM |
| Product Status | Active (legacy line) |
Hướng dẫn cấu hình chân EPM3256AQC208-7 208-pqfp
Cấu hình chân cho EPM3256AQC208-7 (208-pqfp gói). IC số này bao gồm chân GPIO, giao diện truyền thông (UART, SPI, I2C) và chân nguồn. Tham khảo tài liệu thông số kỹ thuật của nhà sản xuất để biết các chức năng chân thay thế và tùy chọn cấu hình. Cực kỳ quan trọng cho thiết kế hệ thống tích hợp và lập trình PCB.
Không có dữ liệu chân cụ thể sẵn có cho EPM3256AQC208-7.
Tham khảo: tài liệu kỹ thuật cho cấu hình chân đầy đủ.
Ứng dụng tiêu biểu
EPM3256AQC208-7 phù hợp cho 6 Áp dụngs: Bus Interface Bridging and Glue Logic, FPGA Configuration and Control Plane Logic, Peripheral I/O Expansion and LED / Display Multiplexing, Industrial Control State Machines, Address Decoding and Chip-Select Generation, Legacy Replacement and Long-Life-cycle Designs.
Bus Interface Bridging and Glue Logic
The EPM3256AQC208-7 is well suited to bus-bridging and glue-logic duties between microprocessors, memories, and peripherals where deterministic timing matters. Its 256 macro cells and 158 user I/Os comfortably implement address decoders, chip-select generators, wait-state insertion, and protocol converters on a single device. The 7.5 ns pin-to-pin delay delivers address-to-chip-select latency below one PCI clock at 33 MHz, and the MultiVolt I/O banks connect directly to 5 V microcontrollers and 3.3 V peripherals without external level shifters, reducing BOM cost and PCB area. With non-volatile EEPROM configuration the device is instantly active at power-up, eliminating the FPGA-style configuration delay that would otherwise stall the host CPU's boot ROM access.
Được đề xuất
FPGA Configuration and Control Plane Logic
In FPGA-based systems the EPM3256AQC208-7 is commonly used as a configuration supervisor: it sequences the FPGA's PROG, INIT, and DONE signals, multiplexes between multiple bitstreams, and implements housekeeping state machines. Its 126.6 MHz internal counter frequency is fast enough to handle UART, SPI, or I2C configuration interfaces, while 256 macro cells absorb substantial state-machine complexity including watchdog timers and fallback boot logic. The 208-PQFP footprint is large enough to bring out all control signals but small enough to fit beneath or beside an FPGA on the same board. The instant-on non-volatile configuration guarantees the CPLD is live before the FPGA begins its configuration sequence.
Được đề xuất
Peripheral I/O Expansion and LED / Display Multiplexing
The 161 user I/Os on the EPM3256AQC208-7 make it a strong fit for I/O expansion in industrial controllers, where dozens to hundreds of digital lines must be scanned, debounced, or PWM-driven from a single host interface. The CPLD's macro-cell flip-flops absorb scan-matrix multiplexing for keypads and LED matrices without burdening the host MCU, while the 126.6 MHz counter frequency supports high-refresh-rate multiplexed seven-segment or dot-matrix displays. The MultiVolt I/O banks let the same CPLD drive both 5 V LED displays and 3.3 V MCU-side logic, simplifying mixed-voltage PCBs and reducing the bill of materials.
Được đề xuất
Industrial Control State Machines
For PLC-style industrial controllers, the EPM3256AQC208-7 implements deterministic state machines for sequential process control, stepper-motor commutation, and safety interlocks. The 256 macro cells comfortably encode complex multi-stage state diagrams with parallel transition logic, while the deterministic 7.5 ns pin-to-pin delay lets designers calculate worst-case reaction time for safety-critical inputs. The commercial 0-70 °C temperature grade suits most factory-floor enclosures; for harsher industrial environments, swap to the AQI208-10N industrial variant on the same footprint. JTAG (IEEE 1149.1) boundary-scan support allows in-system programming and board-level interconnect testing, reducing manufacturing test cost.
Được đề xuất
Address Decoding and Chip-Select Generation
Classic CPLD territory: the EPM3256AQC208-7 generates chip-select signals for memory banks, peripherals, and I/O devices from a microprocessor address bus. With 256 macro cells and wide input gating, the device can decode address spaces of 24-32 bits while leaving room for additional control logic such as wait-state insertion, byte-enable steering, and bus-cycle tracking. The MultiVolt I/O supports direct connection to both 5 V 8051-class MCUs and 3.3 V ARM cores, and the instant-on behavior means decoders are live before the host begins its first memory access, eliminating boot-time glitches that could cause unintended peripheral activation.
Được đề xuất
Legacy Replacement and Long-Life-cycle Designs
The EPM3256AQC208-7 is widely used in long-lifecycle products such as medical instrumentation, test equipment, aerospace ground support, and industrial controllers that must remain in production for 10-20 years. Its mature EEPROM-based architecture, well-documented IEEE 1532 ISP, and broad distributor stock make it a stable choice for designs that cannot tolerate the supply churn of newer families. When the -7 speed grade is out of stock, the -10 and -10N variants on the same 208-PQFP footprint serve as drop-in replacements with a modest 25% timing penalty. For new designs where the user can change footprints, MAX II (EPM240/EPM570) is the recommended modern successor offering lower power and lower cost.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho EPM3256AQC208-7 — so sánh, hướng dẫn thiết kế và thông tin tuân thủ.
Hướng dẫn chọn lựa
So sánh với các sản phẩm thay thế
| Tham số | Sản phẩm này | EPM3256AQC208-10N | EPM3256AQC208-10 | EPM3256AQC208-7N |
|---|---|---|---|---|
| Brand | Altera (Intel FPGA) | Altera (Intel FPGA) | Altera (Intel FPGA) | Altera (Intel FPGA) |
| Package | 208-PQFP (28x28 mm) | 208-PQFP (28x28 mm) - same | 208-PQFP (28x28 mm) - same | 208-PQFP (28x28 mm) - same |
| Macrocells | 256 | 256 | 256 | 256 |
| Usable Gates | 5,000 | 5,000 | 5,000 | 5,000 |
| User I/O | 158 - 161 | 158 - 161 | 158 - 161 | 158 - 161 |
| Pin-to-Pin Delay (tpd) | 7.5 ns | 10 ns | 10 ns | 7.5 ns |
| Max Counter Frequency | 126.6 MHz | 100 MHz (approx) | 100 MHz (approx) | 126.6 MHz |
| Core Supply Voltage | 3.3 V (3.0 - 3.6 V) | 3.3 V (3.0 - 3.6 V) | 3.3 V (3.0 - 3.6 V) | 3.3 V (3.0 - 3.6 V) |
| Operating Temperature | 0 °C to 70 °C (Commercial) | 0 °C to 70 °C (Commercial) | 0 °C to 70 °C (Commercial) | 0 °C to 70 °C (Commercial) |
| Lead-Free / RoHS | No (standard lead finish) | Yes ('N' suffix) | No (standard lead finish) | Yes ('N' suffix) |
Bảo phân biệt quan trọng
- Same-die drop-in upgrade path within the MAX 3000A family (vsEPM3256AQC208-10N)
- Faster -7 speed grade over the slower -10 family (vsEPM3256AQC208-10)
- Larger 208-pin PQFP gives more I/O than smaller MAX 3000A parts (vsEPM3128ATC100-10N)
Ghi chú thiết kế
The EPM3256AQC208-7 requires a tightly regulated 3.3 V supply on VCCINT (3.0 V to 3.6 V range). Place a 100 µF bulk tantalum plus 0.1 µF ceramic decoupling capacitor within 25 mm of each VCCINT pin group; the device can draw substantial transient current during ISP programming. Each VCCIO bank must be tied to its respective logic-rail voltage (2.5 V, 3.3 V, or 5.0 V) and bypassed with 0.1 µF + 10 µF capacitance. Power-supply ramp-up must be monotonic — the MAX 3000A family latches into configuration only after clean power-on reset; noisy or oscillating rails can cause incomplete ISP and silent configuration corruption.
The 208-PQFP (28x28 mm) package requires careful PCB layout because of its fine 0.5 mm pitch leads. Use a 4-layer board with a dedicated ground plane directly beneath the device to control switching noise and provide thermal spreading. All unused user I/O pins should be left floating or tied to ground via 10 kΩ resistors — never leave them driving into an undefined logic state. JTAG pins TDI, TMS, TCK, and TDO must be pulled to known states: TCK pulled low through 10 kΩ, TMS pulled up through 10 kΩ, and TDI pulled up through 10 kΩ, otherwise spurious boundary-scan activity can interfere with normal operation.
Although the EPM3256AQC208-7 is not a high-speed SerDes device, its 7.5 ns pin-to-pin delay translates to a useful toggle bandwidth above 100 MHz. Route clock and high-fanout signals on inner layers with controlled impedance (50 Ω microstrip / stripline) and keep them away from analog sections of the board. The MultiVolt I/O interface tolerates 5 V inputs on the device's 3.3 V VCCIO bank without external clamping — verify in the MAX 3000A datasheet that this hot-swap capability applies to your specific I/O bank configuration. Use Altera's Quartus II (legacy) or Quartus Prime software for place-and-route timing closure to ensure all paths meet setup/hold requirements.
Do not confuse the EPM3256AQC208-7 (PQFP-208, -7 speed grade, commercial temp) with the EPM3256AQI208-10N (PQFP-208, -10 speed grade, industrial temp) or the EPM3256AFC256-7 (FBGA-256, same -7 speed grade but different package footprint — NOT drop-in). Mixing these up will result in either a non-functional PCB (footprint mismatch with FBGA variant) or timing violations (commercial vs industrial grade). The 'AQC' suffix encodes: A = MAX 3000A family, Q = PQFP package, C = commercial temperature, 208 = pin count; speed grade (-7, -10) and lead-free indicator (N) follow separately. Always verify the full order code against the manufacturer datasheet before PCB layout.
Thông tin tuân thủ
The EPM3256AQC208-7 (without 'N' suffix) is the standard lead-finish variant. RoHS/lead-free compliance applies to the '-7N' / '-10N' variants. The part is commercial temperature grade (0-70 °C) and is not AEC-Q100 qualified; choose AQI208 variants for industrial (-40 to 85 °C) applications.
