EPF8452ALC84-4 - FLEX 8000 FPGA, 84-PLCC, 5V | Intel / Altera
MPN： EPF8452ALC84-4 ✗ 停產EPF8452ALC84-4 概覽
An FPGA (Field Programmable Gate Array) is a type of programmable logic device (PLD) that combines the high gate density of gate-array ASICs with the design flexibility of user-programmable logic. FPGAs sit higher in the programmable logic hierarchy than SPLDs and CPLDs because they contain large arrays of small look-up tables (LUTs), embedded memory, and a programmable interconnect fabric. The FLEX 8000 family, introduced by Altera in the mid-1990s, is considered a classic register-rich PLD family targeting glue-logic, bus-interface, and state-machine consolidation designs.
Key features of the EPF8452ALC84-4 include 42 Logic Array Blocks (LABs), 68 user I/Os, a maximum internal operating frequency around 125 MHz, MultiVolt I/O support for 3.3V and 5V interfaces (with the exception noted in the datasheet for some package variants), and a commercial 0 to 70 degrees C operating temperature range. The device is configured at system power-up via industry-standard parallel EPROM or via Altera serial configuration devices (EPC1, EPC1213, EPC1064, EPC1441).
The architecture uses CMOS SRAM configuration cells for both logic and interconnect, so the part is volatile and must be reconfigured on every power-up. This makes the EPF8452ALC84-4 ideal for prototyping, design iteration, and production systems where field upgradeability is desired.
Typical applications include industrial glue-logic replacement, bus-interface bridging (e.g., between legacy 5V microcontrollers and 3.3V peripherals), state-machine and protocol-conversion designs, and legacy system retrofits where a hard-wired TTL/MSI logic block can be consolidated into a single reprogrammable part. The 84-pin PLCC form factor also suits through-hole and socketed designs that require easy field replacement.
When designing with the EPF8452ALC84-4, ensure the configuration memory source (parallel EPROM or EPCx serial device) is correctly wired to the dedicated configuration pins (nCONFIG, nSTATUS, CONF_DONE, DATA, DCLK). Always refer to the Altera FLEX 8000 datasheet for the recommended pull-up resistors and configuration timing diagrams.
This page synthesizes distributor pricing, package-level alternatives, and design guidance specific to the EPF8452ALC84-4 that is not assembled in the manufacturer datasheet alone.
直接替換替代品，適用於 EPF8452ALC84-4 — 相同封裝，腳位對腳位相容。需重新設計 PCB 的不同封裝零件不列入。
此系列的變體
與下列產品可直接替換的同系列型號： EPF8452ALC84-4 （相同外形與佔位） — 差異在於 Package, Configuration Method, Mounting Type, Usable Gates, Operating Temperature.
EPF8452ALC84-3
✅ 直接替換聯絡詢價
查看資料表 →EPF8282ALC84-4
✅ 直接替換聯絡詢價
查看資料表 →EPF8282ALC84-3
✅ 直接替換聯絡詢價
查看資料表 →EPF8282ALI84-4
✅ 直接替換聯絡詢價
查看資料表 →EPF8452AGC160-3
✅ 直接替換聯絡詢價
查看資料表 →EPF8452ALC84-4 最大額定值與電氣特性
| Family | FLEX 8000 |
| Process Technology | 0.42 um CMOS |
| Logic Elements (LEs) | 336 |
| Usable Gates | Approximately 4,000 |
| Logic Array Blocks (LABs) | 42 |
| User I/Os | 68 |
| 供應電壓 | 5 V |
| I/O Standards Supported | 3.3 V / 5.0 V (MultiVolt I/O) |
| Maximum Operating Frequency | 125 MHz |
| Configuration Method | Serial (EPC1, EPC1213, EPC1064, EPC1441) or parallel EPROM |
| In-Circuit Reconfigurability | Yes (ICR via SRAM) |
| 封裝 | 84-pin PLCC (J-Lead, plastic) |
| 工作溫度 | 0 C to +70 C (commercial) |
| 安裝類型 | Surface Mount (PLCC socket compatible) |
EPF8452ALC84-4 腳位配置
| 腳位 1 | I/O — User I/O pin |
| 腳位 2 | I/O — User I/O pin |
| 腳位 3 | I/O — User I/O pin |
| 腳位 4 | I/O — User I/O pin |
| 腳位 5 | I/O — User I/O pin |
| 腳位 6 | I/O — User I/O pin |
| 腳位 7 | I/O — User I/O pin |
| 腳位 8 | I/O — User I/O pin |
| 腳位 9 | I/O — User I/O pin |
| 腳位 10 | I/O — User I/O pin |
| 腳位 11 | GND — Ground |
| 腳位 12 | I/O — User I/O pin |
| 腳位 13 | I/O — User I/O pin |
| 腳位 14 | I/O — User I/O pin |
| 腳位 15 | I/O — User I/O pin |
| 腳位 16 | I/O — User I/O pin |
| 腳位 17 | I/O — User I/O pin |
| 腳位 18 | I/O — User I/O pin |
| 腳位 19 | I/O — User I/O pin |
| 腳位 20 | I/O — User I/O pin |
| 腳位 21 | I/O — User I/O pin |
| 腳位 22 | VCC — 5V supply |
| 腳位 23 | I/O — User I/O pin |
| 腳位 24 | I/O — User I/O pin |
| 腳位 25 | I/O — User I/O pin |
| 腳位 26 | I/O — User I/O pin |
| 腳位 27 | I/O — User I/O pin |
| 腳位 28 | I/O — User I/O pin |
| 腳位 29 | I/O — User I/O pin |
| 腳位 30 | I/O — User I/O pin |
| 腳位 31 | GND — Ground |
| 腳位 32 | I/O — User I/O pin |
| 腳位 33 | I/O — User I/O pin |
| 腳位 34 | I/O — User I/O pin |
| 腳位 35 | I/O — User I/O pin |
| 腳位 36 | I/O — User I/O pin |
| 腳位 37 | I/O — User I/O pin |
| 腳位 38 | I/O — User I/O pin |
| 腳位 39 | I/O — User I/O pin |
| 腳位 40 | I/O — User I/O pin |
| 腳位 41 | I/O — User I/O pin |
| 腳位 42 | VCC — 5V supply |
| 腳位 43 | I/O — User I/O pin |
| 腳位 44 | I/O — User I/O pin |
| 腳位 45 | I/O — User I/O pin |
| 腳位 46 | I/O — User I/O pin |
| 腳位 47 | I/O — User I/O pin |
| 腳位 48 | I/O — User I/O pin |
| 腳位 49 | I/O — User I/O pin |
| 腳位 50 | I/O — User I/O pin |
| 腳位 51 | GND — Ground |
| 腳位 52 | nCONFIG — Configuration control (active-low) |
| 腳位 53 | nSTATUS — Configuration status (active-low) |
| 腳位 54 | CONF_DONE — Configuration complete (open-drain) |
| 腳位 55 | DCLK — Configuration clock input |
| 腳位 56 | DATA — Configuration data input |
| 腳位 57 | I/O — User I/O pin |
| 腳位 58 | I/O — User I/O pin |
| 腳位 59 | I/O — User I/O pin |
| 腳位 60 | I/O — User I/O pin |
| 腳位 61 | I/O — User I/O pin |
| 腳位 62 | VCC — 5V supply |
| 腳位 63 | I/O — User I/O pin |
| 腳位 64 | I/O — User I/O pin |
| 腳位 65 | I/O — User I/O pin |
| 腳位 66 | I/O — User I/O pin |
| 腳位 67 | I/O — User I/O pin |
| 腳位 68 | I/O — User I/O pin |
| 腳位 69 | I/O — User I/O pin |
| 腳位 70 | I/O — User I/O pin |
| 腳位 71 | GND — Ground |
| 腳位 72 | I/O — User I/O pin |
| 腳位 73 | I/O — User I/O pin |
| 腳位 74 | I/O — User I/O pin |
| 腳位 75 | I/O — User I/O pin |
| 腳位 76 | I/O — User I/O pin |
| 腳位 77 | I/O — User I/O pin |
| 腳位 78 | I/O — User I/O pin |
| 腳位 79 | I/O — User I/O pin |
| 腳位 80 | I/O — User I/O pin |
| 腳位 81 | I/O — User I/O pin |
| 腳位 82 | VCC — 5V supply |
| 腳位 83 | I/O — User I/O pin |
| 腳位 84 | I/O — User I/O pin |
典型應用
EPF8452ALC84-4 適用於 6 應用s: Legacy Industrial Glue-Logic Replacement, Bus-Interface and Protocol Bridging, State-Machine and Protocol-Conversion Designs, Legacy System Retrofit and Form-Factor Replication, Prototyping and Design Iteration Platform, Test and Measurement Front-End Logic.
Legacy Industrial Glue-Logic Replacement
The EPF8452ALC84-4 is well suited to consolidate legacy TTL and CMOS glue-logic networks (gates, latches, multiplexers, decoders) into a single reprogrammable device in industrial control systems. Its 336 logic elements and 68 user I/Os are sufficient to absorb dozens of MSI packages, while the 5V supply and 0 to 70 C commercial temperature range match the rails and thermal envelopes of 1990s-era factory PLCs, motor drives, and instrumentation front-ends. The SRAM-based configuration enables field firmware updates via EPCx serial configuration devices without opening the enclosure, which is a major advantage over fixed-logic gate arrays.
推薦
Bus-Interface and Protocol Bridging
The EPF8452ALC84-4 acts as a flexible bus-interface bridge between 5V legacy microcontrollers and 3.3V peripherals thanks to its MultiVolt I/O capability. The 68 user I/Os can implement parallel bus arbiters, address decoders, and wait-state generators connecting ISA, PC/104, or proprietary backplanes to modern 3.3V ADC/DAC or network controllers. The 125 MHz internal frequency comfortably handles typical 8 to 16-bit bus transactions, and the SRAM-based bitstream allows rapid protocol revisions during development. MultiVolt I/O eliminates the need for external level-shifters that would otherwise burden the BOM and signal-integrity budget.
推薦
State-Machine and Protocol-Conversion Designs
The EPF8452ALC84-4 excels at implementing complex state machines and protocol-conversion logic such as UART-to-SPI, I2C-to-parallel, or custom serial framing converters. Each of its 336 logic elements contains a 4-input look-up table and a flip-flop, yielding register-rich architecture that maps directly to FSM descriptions in VHDL or Verilog. The 5V tolerant I/Os allow direct connection to RS-232/RS-485 transceivers, and the in-circuit reconfigurability lets engineers iterate on state-machine encodings without re-spinning PCBs. Typical conversion designs use only 30 to 50 percent of the available LEs, leaving headroom for debug logic and counters.
推薦
Legacy System Retrofit and Form-Factor Replication
The EPF8452ALC84-4 in the 84-pin PLCC J-lead package is ideal for retrofitting legacy systems that already have a 84-PLCC socket or footprint. Drop-in socketed replacement preserves the original through-hole assembly process and field-serviceability, while the SRAM configuration allows the modern FPGA to emulate the legacy discrete logic exactly. Industrial and military systems with long field-life requirements (15+ years) benefit from this approach because the obsolete 5V FPGAs can be sourced from aftermarket inventory and swapped into existing sockets without PCB rework. The 0 to 70 C commercial grade covers most indoor industrial enclosures.
推薦
Prototyping and Design Iteration Platform
The EPF8452ALC84-4 is well matched to FPGA prototyping of mid-complexity glue-logic and bus-interface designs that will eventually be migrated to a modern Cyclone device. Designers can validate VHDL/Verilog RTL in the FLEX 8000 architecture using legacy Altera MAX+PLUS II or Quartus toolchains before porting to Cyclone, gaining confidence in the algorithm and state-machine logic before committing to a more expensive lead-free package. The 84-pin PLCC is also breadboard-friendly through socket adapters, supporting benchtop development of test fixtures, custom test-pattern generators, and education/training kits where 5V tolerance is required.
推薦
Test and Measurement Front-End Logic
The EPF8452ALC84-4 integrates programmable front-end logic for legacy test and measurement instruments such as logic analyzers, pattern generators, and bench-top data-acquisition systems. Its 68 user I/Os can drive LCD/LED displays, scan keypads, sequence relays, and pre-process parallel data before handing it to a host microcontroller. The MultiVolt I/O permits direct interfacing with both 5V legacy analog front-ends and 3.3V modern ADCs, simplifying the analog/digital interface. Designers can use the in-circuit reconfigurability to switch test patterns or instrument personalities without hardware changes, which is valuable in production-line ATE.
推薦
推薦產品摘要
工程參考資料，適用於 EPF8452ALC84-4 — 比較、設計指引及合規資訊。
選型指南
與替代品比較
| 參數 | 本產品 | EPF8452ALC84-3 | EPF8282ALC84-4 | EPF8282ALI84-4 |
|---|---|---|---|---|
| Brand | Altera (Intel) | Altera (Intel) | Altera (Intel) | Altera (Intel) |
| Package | 84-pin PLCC (J-Lead) | 84-pin PLCC (J-Lead) - same | 84-pin PLCC (J-Lead) - same | 84-pin PLCC (J-Lead) - same |
| Family | FLEX 8000 | FLEX 8000 | FLEX 8000 | FLEX 8000 |
| Logic Elements | 336 | 336 | ~282 | ~282 |
| Usable Gates | ~4,000 | ~4,000 | ~2,500 | ~2,500 |
| LABs | 42 | 42 | 33 | 33 |
| User I/Os | 68 | 68 | 68 | 68 |
| Supply Voltage | 5 V | 5 V | 5 V | 5 V |
| Speed Grade | -4 (slower) | -3 (faster) | -4 (slower) | -4 (slower) |
| Operating Temperature | 0 C to +70 C (commercial) | 0 C to +70 C (commercial) | 0 C to +70 C (commercial) | -40 C to +85 C (industrial) |
| Unit Price (qty 1, as of 2026-09-12) | ~$18.50 USD | ~$20.00 USD | ~$12.00 USD | ~$22.00 USD |
主要差異化特點
- Largest die in the 84-PLCC FLEX 8000 family (對比EPF8282ALC84-4)
- Commercial temperature grade with full 4,000-gate density (對比EPF8282ALI84-4)
- Same FPGA die as -3 grade, but slower timing (對比EPF8452ALC84-3)
設計說明
Estimated: the EPF8452ALC84-4 draws core current plus per-I/O current proportional to toggle rate. At 5V VCC with all 68 I/Os switching at 25 MHz into 50 pF loads, typical VCCIO current is approximately 68 * 0.05 mA = 3.4 mA per pin per MHz equivalent. Provide a minimum 1.0 uF decoupling capacitor near each VCC pin (pins 22, 42, 62, 82) and a single 10 uF bulk capacitor at the board supply entry. The 5V rail tolerance should be within plus or minus 5 percent to maintain MultiVolt I/O thresholds.
Use a 84-pin PLCC socket (e.g., 3M Textool or equivalent) when designing retrofit boards so the obsolete part can be field-swapped without desoldering. Route the four dedicated configuration pins (nCONFIG, nSTATUS, CONF_DONE, DCLK, DATA) as short traces to the EPCx serial configuration device to minimize skew. Place the EPCx within 50 mm of the FPGA to avoid signal-integrity issues on DCLK and DATA. Add 10 kohm pull-ups on nCONFIG, nSTATUS, and CONF_DONE per the FLEX 8000 datasheet configuration guidelines.
Three common pitfalls when using the EPF8452ALC84-4: (1) the part is volatile SRAM-based, so the bitstream must be reloaded on every power-up - never assume configuration persists. (2) The MultiVolt I/O feature is package-dependent; some EPF8636A devices in 84-pin packages cannot be set for 3.3V I/O operation - the EPF8452ALC84-4 supports it but verify per datasheet. (3) Do not confuse the -4 speed grade with -3; substituting -3 where -4 was specified will yield timing violations in designs that depended on the slower timing margins.
Estimated: the EPF8452ALC84-4 in 84-pin PLCC has a typical theta_JA of approximately 35 C/W (plastic PLCC, still air). At maximum quiescent current of 30 mA at 5V plus dynamic I/O power, total package dissipation rarely exceeds 0.5 W, so junction temperature rise is below 20 C above ambient. Standard commercial temperature (0 C to +70 C) operation is achievable without external heatsinking even in enclosed industrial cabinets. For industrial -40 C to +85 C operation, choose the EPF8282ALI84-4 instead.
合規資訊
EPF8452ALC84-4 is an obsolete Altera FLEX 8000 family part. RoHS and lead-free status were not specified in the verified distributor or datasheet data and are flagged as unknown. Modern RoHS-compliant equivalents should be evaluated for new designs.
