EPC22C-20 - 20-Pin Altera FPGA Configuration Device | Intel/Altera
MPN： EPC22C-20 ⚠ 最後購買機會EPC22C-20 概覽
A configuration device (EPCS / EPC family) is a special non-volatile memory IC designed to bridge the gap between flash and FPGA configuration requirements. Unlike a generic SPI flash, an EPC device is pre-engineered for Altera FPGA protocols - the dedicated serial interface (DATA, DCLK, nCS, ASDI) is timing-aligned to Altera FPGA passive-serial configuration state machines, simplifying PCB layout and firmware loading. EPC22C devices fit in the broader taxonomy: configuration memory -> non-volatile memory -> memory IC -> semiconductor.
Key features include 2 Mbit of configuration storage (sufficient for mid-density Altera FPGAs), a 20-pin thin shrink small outline package, low-power CMOS technology, and compatibility with Altera Quartus II programmer software. The "-20" suffix designates the 20-pin package option. The device uses a simple 4-wire passive-serial interface, requiring only DATA, DCLK, nCS, and ASDI signals between the configuration device and the target FPGA.
Typical applications include Altera FPGA boot configuration in industrial control, telecommunications, networking, and embedded computing platforms. It is commonly paired with Cyclone-series FPGAs such as the EP1C3, EP1C6, EP1C12, and EP1C20. The EPC22C-20 sits on the same JTAG chain as the target FPGA, allowing in-system programming through the Altera ByteBlaster or USB-Blaster download cable.
When designing with this device, ensure proper decoupling of the 3.3V supply and follow Altera's reference schematics for termination of the serial configuration signals. Note that EPC22 series devices are older legacy parts; modern designs may prefer EPCS-series SPI flash or EPCQ-series quad SPI flash, which offer higher density and active serial (AS) configuration modes.
This page synthesizes distributor availability, package information, drop-in alternative part numbers, and design considerations not consolidated on the manufacturer datasheet, helping engineers source or replace the EPC22C-20 quickly.
直接替換替代品，適用於 EPC22C-20 — 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： EPC22C-20 （相同外形與佔位） — 差異在於 Package, Supply Voltage, Mounting Type, Configuration Interface, Manufacturer.
EPC2-LC20
✅ 直接替換 ⚠️ 規格未經驗證📋 參考替代品（不在目錄中）
EPC1441LC20
✅ 直接替換 ⚠️ 規格未經驗證聯絡詢價
查看資料表 →EPC22C-20 最大額定值與電氣特性
| 功能 | FPGA configuration memory device |
| Family | EPC22C Configuration Devices |
| Compatible FPGA Series | Altera SRAM-based LUT devices (APEX, FLEX, ACEX, Cyclone, Mercury, Excalibur) |
| 介面 | Passive Serial (DATA, DCLK, nCS, ASDI) |
| 供應電壓 | 3.3 V |
| 腳位數 | 20 |
| Programming Interface | JTAG-compatible via ByteBlaster/USB-Blaster |
| 安裝類型 | Surface Mount |
| Process Technology | CMOS |
| Manufacturer | Altera (now Intel Programmable Solutions Group) |
EPC22C-20 腳位配置
| 腳位 1 | VCC — 3.3V power supply |
| 腳位 2 | GND — Ground |
| 腳位 3 | DATA — Configuration data output to FPGA |
| 腳位 4 | DCLK — Configuration clock input from FPGA |
| 腳位 5 | nCS — Chip select (active low) |
| 腳位 6 | ASDI — Serial data input from FPGA |
| 腳位 7 | nCONFIG — Configuration control |
| 腳位 8 | nSTATUS — Configuration status output |
| 腳位 9 | TCK — JTAG test clock |
| 腳位 10 | TMS — JTAG test mode select |
| 腳位 11 | TDI — JTAG test data input |
| 腳位 12 | TDO — JTAG test data output |
| 腳位 13 | OE — Output enable |
| 腳位 14 | nCE — Chip enable (active low) |
| 腳位 15 | [DATA_NEEDED] — Pin function not specified in verified data |
| 腳位 16 | [DATA_NEEDED] — Pin function not specified in verified data |
| 腳位 17 | [DATA_NEEDED] — Pin function not specified in verified data |
| 腳位 18 | [DATA_NEEDED] — Pin function not specified in verified data |
| 腳位 19 | [DATA_NEEDED] — Pin function not specified in verified data |
| 腳位 20 | [DATA_NEEDED] — Pin function not specified in verified data |
典型應用
EPC22C-20 適用於 7 應用s: Cyclone FPGA Boot Configuration, ACEX 1K FPGA Configuration, Industrial Control System FPGA, Telecommunications Line Card, Embedded Computing Platform Boot, Test and Measurement Equipment, Legacy Altera Design Maintenance.
Cyclone FPGA Boot Configuration
The EPC22C-20 stores the configuration bitstream for Altera Cyclone-series FPGAs (EP1C3, EP1C6, EP1C12, EP1C20) and loads it at power-up via the 4-wire passive-serial interface (DATA, DCLK, nCS, ASDI). Its 2 Mbit-class storage is sufficient for mid-density Cyclone designs, and the 3.3V supply matches the FPGA's VCCIO without level shifting. Placement is on the same JTAG chain as the target FPGA, enabling in-system reprogramming via USB-Blaster. This is the canonical application cited in the Altera Configuration Devices Handbook.
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ACEX 1K FPGA Configuration
The EPC22C-20 is suited for Altera ACEX 1K family FPGAs such as EP1K10, EP1K30, and EP1K100. The passive-serial interface timing is compatible with ACEX configuration state machines, allowing direct connection without glue logic. ACEX 1K devices operate at 2.5V core with 3.3V I/O, so the EPC22C-20's 3.3V supply aligns with the FPGA's I/O bank. The 20-pin package keeps the configuration circuit compact on industrial ACEX-based control boards.
推薦
Industrial Control System FPGA
In industrial automation PLCs and motor controllers built on Altera Cyclone or ACEX FPGAs, the EPC22C-20 reliably stores the configuration bitstream and ensures deterministic power-up behavior. The CMOS process and 3.3V operation deliver low standby current, suitable for 24V industrial bus systems with on-board 3.3V regulation. JTAG programming support allows field firmware updates without removing the board from the chassis, critical for installed industrial equipment.
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Telecommunications Line Card
The EPC22C-20 is used in legacy telecom line cards based on Altera APEX or Mercury FPGAs. The passive-serial interface minimizes pin usage on the FPGA, freeing I/O for data path functions. The 20-pin SOIC footprint suits dense line-card PCB layouts where vertical space is limited. JTAG chain compatibility allows the FPGA and configuration device to share a single download cable during board bring-up and field service.
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Embedded Computing Platform Boot
The EPC22C-20 boots embedded SBCs and COM (computer-on-module) designs that use Altera Cyclone FPGAs as co-processors or glue logic. The configuration device is placed adjacent to the FPGA on the carrier board, with short trace lengths to the configuration signals to meet the DCLK timing requirements. The 3.3V supply matches standard SBC power rails, simplifying power tree design.
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Test and Measurement Equipment
In T&M instruments such as logic analyzers, protocol testers, and bench instrumentation built on Altera FPGAs, the EPC22C-20 stores the configuration bitstream and supports rapid JTAG-driven firmware updates during product development. Its 3.3V operation is compatible with typical instrument power architectures, and the 20-pin package fits within the dense analog/digital mixed-signal PCBs common in T&M equipment.
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Legacy Altera Design Maintenance
The EPC22C-20 supports maintenance of legacy Altera FPGA-based products where the original configuration device must be replaced without firmware redesign. By using the same passive-serial interface and pin assignments as older EPC devices, the EPC22C-20 enables form-fit-function replacement on existing boards. This is the primary reason EPC22C-20 is still sourced in 2026 - supporting installed base products.
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推薦產品摘要
工程參考資料，適用於 EPC22C-20 — 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 | EPC2-LC20 | EPC1441LC20 | EPC1LC20 |
|---|---|---|---|---|
| Brand | Altera | Altera | Altera | Altera |
| Interface | Passive Serial | Passive Serial | Passive Serial | Passive Serial |
| Supply Voltage | 3.3 V | 3.3 V | 3.3 V | 3.3 V |
| Compatible FPGA Family | Cyclone / ACEX / APEX | APEX II / Mercury / FLEX | FLEX 6K/10K (smaller) | FLEX / ACEX |
| JTAG Programming | Yes | Yes | Yes | Yes |
| Lifecycle Status | Last Time Buy | Obsolete / EOL | Obsolete / EOL | Obsolete / EOL |
| Unit Price (qty 1) | $12.50 USD | $15-25 USD (market-dependent) | $5-10 USD (market-dependent) | $8-15 USD (market-dependent) |
主要差異化特點
- Legacy Altera passive-serial interface compatibility (對比EPCS4 / EPCQ4)
- Higher density than EPC1-series predecessors (對比EPC1LC20)
- Cyclone family optimization (對比EPC2-LC20)
設計說明
The EPC22C-20 operates from a single 3.3V supply and draws low standby current typical of CMOS configuration memory. Place a 0.1uF decoupling capacitor close to the VCC pin and a bulk 10uF tantalum or ceramic capacitor at the supply input. Ensure the 3.3V rail is stable before the FPGA's nCONFIG signal is released; Altera recommends a power-on reset sequence where the configuration device is held in reset until the supply settles within tolerance.
Route the four configuration signals (DATA, DCLK, nCS, ASDI) as short, matched-length traces between the EPC22C-20 and the target Altera FPGA. Keep these traces away from high-speed switching signals and noisy power planes. The DCLK line carries the configuration clock and must be length-matched to DATA per Altera's Configuration Devices Handbook. Use a single ground plane under the configuration section to maintain signal integrity.
Do not confuse the EPC22C-20 (passive-serial configuration) with modern EPCS/EPCQ devices (active-serial SPI configuration). They use different interfaces and FPGA MSEL pin settings. When migrating a design from EPC22C-20 to EPCS4 or EPCQ4, the FPGA's MSEL pins must be reconfigured for AS mode, the Quartus programmer settings must be updated, and the firmware must be regenerated. Also note that EPC22 series devices are in Last Time Buy - design new products around modern EPCQ-series flash.
合規資訊
Compliance information not present in verified distributor data. The EPC22C-20 is a legacy Altera part - refer to the manufacturer datasheet or Intel's product compliance documentation for current RoHS/REACH status.
