FPGA & CPLD
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EPF8820ARI208-1 - FLEX 8000 FPGA, 672 LEs, 5V, 208-RQFP | Altera
The Altera (now Intel) EPF8820ARI208-1 is a member of the FLEX 8000 family of SRAM-based Field-Programmable Gate Arrays (FPGAs) fabricated on a 0.42 µm CMOS process. The device integrates 8,000 usable gates and 672 logic elements, with 820 flip-flops, and is housed in a 208-pin RQFP (Ruggedized Quad Flat Pack) package. It operates from a nominal 5V supply with an input range of 4.5V to 5.5V. A Field-Programmable Gate Array (FPGA) is a type of programmable logic device (PLD) that combines the architectural density of gate arrays with the design flexibility of in-system programmability. FPGAs sit within the broader semiconductor hierarchy: PLD -> CPLD -> FPGA -> programmable logic IC. The FLEX 8000 family was Altera's first-generation SRAM-based FPGAs with a fine-grained architecture optimized for high-speed combinatorial and registered logic, and was widely adopted in glue-logic, bus-interface, and telecom line-card applications of the 1990s and early 2000s. Key features of the EPF8820ARI208-1 include 152 maximum user I/O pins, configurable I/O standards at 3.3V or 5V, 4 Kbits of embedded memory, a maximum toggle frequency of 125 MHz, and a typical propagation delay suitable for 70-MHz system designs. The device is in-system programmable via a JTAG/IEEE 1149.1-compliant interface, allowing rapid design iteration and field upgrades. Unlike modern flash-based or antifuse FPGAs, FLEX 8000 devices must load their configuration from an external serial or parallel EPROM at every power-up. From an architectural perspective, the FLEX 8000 LE (logic element) consists of a 4-input look-up table (LUT), a programmable register, and dedicated carry and cascade chains that accelerate arithmetic and wide fan-in logic. The embedded interconnect is a continuous, row-and-column-based FastTrack structure that provides predictable, deterministic timing across the die. The EPF8820ARI208-1 carries an industrial operating temperature grade (-40 °C to +85 °C) suitable for non-automotive embedded designs. Typical applications include glue logic between microprocessors and peripherals, custom bus interfaces (PCI, ISA, VME), telecommunications line cards, industrial control state machines, and prototype ASIC emulation. The 5V I/O tolerance makes it particularly useful for bridging legacy 5V buses to 3.3V ASICs and microcontrollers of that era. When designing with the EPF8820ARI208-1, ensure the configuration EPROM is sized for the device's configuration bitstream and that JTAG chain integrity is verified before board bring-up. Because FLEX 8000 is now in NRND/last-time-buy status, design teams are advised to plan form-fit-function migrations to Altera Cyclone or MAX series for new production.
EPF8820ARI208-2 - FLEX 8000 FPGA, 672 Logic Elements | Altera
The Altera EPF8820ARI208-2 is a member of the FLEX 8000 family of SRAM-based Field Programmable Gate Arrays (FPGAs) housed in a 208-pin RQFP/RFP package. It provides 672 logic elements (LEs) and a maximum of 152 user I/O pins, with logic capacity suitable for glue logic, state-machine control, and small to mid-complexity datapath designs in industrial, telecommunications, and embedded systems. The device integrates 6 embedded array blocks (EABs) totaling approximately 16 Kbits of SRAM, configurable as RAM, ROM, or FIFO. Architecture highlights include FastTrack interconnect, look-up table (LUT) based logic, and a fine-grained, register-rich fabric. An FPGA (Field Programmable Gate Array) is a reprogrammable semiconductor device whose logic function is defined by configuration bitstream rather than fixed metal mask. FPGAs sit at the top of the programmable logic hierarchy: programmable logic device (PLD) -> complex PLD (CPLD) -> FPGA. SRAM-based FPGAs such as the FLEX 8000 family are volatile and must be reconfigured at every power-up from an external memory (EPROM) or Altera serial configuration device (EPC1, EPC1213, EPC1064, EPC1441). Key features of the EPF8820ARI208-2 include 672 logic elements, 152 maximum user I/O pins, 6 embedded array blocks (EABs) of 2 Kbits each, in-system reprogrammability via JTAG, and a typical gate count of 8,000 usable gates. The -2 speed grade indicates a moderate-speed bin of the silicon, suitable for cost-sensitive commercial designs. The device supports multiple I/O standards including TTL and CMOS, allowing flexible interfacing to legacy and modern logic families. The FLEX 8000 architecture uses a four-input LUT per logic element with a dedicated register, providing predictable timing and a register-to-logic ratio well-suited for pipelined datapaths. The FastTrack continuous routing fabric and row/column interconnect provide predictable delays independent of placement, simplifying static timing closure in mid-complexity designs. Typical applications include industrial control logic, telecommunications interface glue, prototyping platforms for ASIC emulation, and educational hardware design. The wide I/O count (152 user pins) allows direct connection to parallel buses, memory interfaces, and multiple peripheral buses without external bus expander logic. The SRAM configuration also enables rapid design iteration via JTAG or EPC device reprogramming. When designing with the EPF8820ARI208-2, ensure an external configuration memory is selected because the SRAM configuration is volatile. The 208-pin package provides ample I/O but requires a 4-layer PCB with controlled-impedance traces for stable operation above 50 MHz. JTAG programming via the Altera ByteBlaster or compatible download cable is the standard development flow. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet, providing a one-stop engineering reference for sourcing and integrating this legacy FLEX 8000 FPGA.
EPF8820ARI208-2N - FLEX 8000 FPGA, 208-Pin RQFP | Altera
The Altera EPF8820ARI208-2N is a member of the FLEX 8000 family of SRAM-based programmable logic devices, delivering approximately 8,820 usable gates with 504 logic elements and a maximum of 78 user I/O pins in a 208-pin RQFP (Plastic Quad Flat Pack) surface-mount package. The "-2N" speed grade designation places it in Altera's mid-tier performance bin, while the trailing "N" indicates lead-free / lead-bearing compliant assembly per Altera's packaging nomenclature from the mid-1990s. The FLEX 8000 series was Altera's first architecture to combine FastTrack Interconnect with embedded logic array blocks (LABs), and this variant was widely adopted in telecommunications, industrial control, and glue-logic designs of the late 1990s and early 2000s. A Field-Programmable Gate Array (FPGA) is a type of integrated circuit that can be configured by the customer after manufacturing to implement arbitrary digital logic. FPGAs sit in the programmable logic hierarchy beneath ASICs (Application-Specific Integrated Circuits) but above simple PLDs (Programmable Logic Devices), offering a balance of density, performance, and time-to-market flexibility. The FLEX 8000 family specifically targets glue-logic, bus interfacing, and state-machine applications where discrete TTL or CPLD integration would be too large or too slow. EPF8820ARI208-2N operates on 5.0 V core supply and is supported by the MAX+PLUS II and Quartus design toolchains. Key features of this device include FastTrack continuous routing architecture, four dedicated input pins, a global Clear signal, programmable output slew-rate control, and JTAG-compliant boundary-scan support per IEEE Std 1149.1. Each LAB contains eight logic elements (LEs), each LE consisting of a 4-input LUT, a programmable register, and carry/chain logic for arithmetic operations. The 208-pin RQFP package provides ample signal margin for legacy bus architectures including PCI, ISA, and VME. Typical applications include telecommunications backplane glue logic, industrial motor-control state machines, legacy PCI interface bridges, and military/aerospace digital subsystems. The -2 speed grade is the most commonly specified FLEX 8000 variant, offering a balance of timing margin and cost for non-critical-path designs. When designing with this device, engineers should note that the FLEX 8000 family is NRND (Not Recommended for New Designs) - modern Cyclone or MAX series devices are recommended for new projects. Existing designs should verify pinout compatibility before migration and consult Altera's migration guides for footprint and timing deltas. Designers should also provision 5.0 V tolerance on I/O banks interfacing with legacy 5 V logic families.
EPF8820ARI208-3 - 672 LE FLEX 8000 FPGA, 208-PQFP | Altera
The Altera (Intel) EPF8820ARI208-3 is a member of the FLEX 8000 family of CMOS Field-Programmable Gate Arrays (FPGAs), delivering 672 logic elements (LEs) in a 208-pin Plastic Quad Flat Pack (PQFP/RQFP) package with industrial-grade temperature rating. The device integrates 152 user I/O lines plus 4 dedicated inputs, supports configurable I/O standards at 3.3 V or 5 V, and reaches a maximum internal clock frequency of 385 MHz. An FPGA (Field-Programmable Gate Array) is a type of programmable logic device that allows designers to configure arbitrary digital logic after manufacturing using a combination of look-up tables (LUTs), programmable interconnect, and I/O cells. FPGAs sit within the semiconductor hierarchy as: programmable logic -> logic IC -> integrated circuit -> semiconductor. The FLEX 8000 family was Altera's first-generation fine-grained SRAM-based FPGA architecture, predating modern Cyclone and Stratix families, and remains in service in long-lifecycle industrial, telecom, and legacy aerospace designs. Key architectural features include 672 logic elements, 152 user I/O, configurable I/O voltage (3.3 V or 5 V), 385 MHz maximum clock frequency, and SRAM-based configuration cells requiring external configuration memory. The -3 speed grade indicates a specific FLEX 8000 timing bin, and the 'I' suffix denotes the industrial temperature range. Unlike modern flash- or antifuse-based FPGAs, FLEX 8000 devices must be reconfigured on every power-up via a serial configuration EPROM or microcontroller. Typical applications include industrial control logic, telecom interface glue logic, legacy PCI bridge designs, peripheral bus controllers, and long-lifecycle embedded systems where re-spinning the FPGA is impractical. The 5 V tolerance on I/O is particularly valuable for interfacing to legacy TTL buses. When designing with this device, note that FLEX 8000 devices are now NRND/EOL - plan for migration to Cyclone II/III/V or similar modern Altera/Intel FPGAs for new designs. Programming requires Altera MAX+PLUS II or Quartus (legacy support mode) plus a configuration device such as EPC1 or EPC2. This page synthesizes distributor stock, drop-in same-package alternatives from the FLEX 8000 family, and practical migration guidance not found in the original datasheet.
EPF8820ARI208-3N - 672 LEs FLEX 8000 FPGA, 208-PQFP | Intel / Altera
The Intel / Altera EPF8820ARI208-3N is a member of the legacy FLEX 8000 programmable logic device family, featuring 672 logic elements (LEs), 16 logic array blocks (LABs), and 672 dedicated flip-flops, packaged in a 208-pin Plastic Quad Flat Pack (PQFP/RQFP) with industrial temperature grading. The FLEX 8000 family was the first Altera SRAM-based FPGA architecture to combine the fine-grained logic and high register count of FPGAs with the high-speed, predictable interconnect delays of EPLDs, providing up to 50,000 usable gates. The "ARI208" suffix denotes a 208-pin RQFP package, "A" indicates the FLEX 8000A speed-grade enhancement, "R" denotes tape-and-reel packaging, and "I" specifies the industrial operating temperature range. The "-3N" suffix marks a specific speed grade and lead-free finish. A Field Programmable Gate Array (FPGA) is a semiconductor integrated circuit built around an array of configurable logic blocks (CLBs), programmable interconnect, and configurable I/O cells, all controlled by SRAM-based configuration memory. FPGAs occupy the highest tier in the programmable logic hierarchy - sitting between discrete logic ICs and ASICs - and are widely used for high-density glue logic, prototyping, DSP, and parallel processing where time-to-market and in-system reprogrammability are paramount. The FLEX 8000 family, launched in the mid-1990s, established many of the architectural conventions still used in modern Altera/Intel FPGA families. Key architectural features include configurable I/O standards supporting both 3.3V and 5V operation, embedded logic array blocks with cascade-chain interconnect for high-speed wide-input functions, and JTAG-based in-system programming via the ByteBlaster or BitBlaster download cables. Each logic element contains a 4-input look-up table (LUT) plus a programmable flip-flop, and each LAB aggregates 8 LEs plus local interconnect. The device also integrates a global ClearN signal, four dedicated clock inputs, and a configurable output enable per I/O pin. Typical applications for the EPF8820ARI208-3N include industrial control glue logic, legacy telecom interface cards, bus-bridging and protocol-conversion logic, test and measurement front-ends, and migration of older Altera designs that require a true drop-in replacement on existing PQFP-208 PCB footprints. The wide 3.3V/5V I/O tolerance and -40C to +85C industrial temperature range also support factory-automation and instrumentation designs. Many engineers keep FLEX 8000 stocks for maintaining long-life industrial equipment where a board re-spin is cost-prohibitive. A critical design consideration is the device's 5V/3.3V dual-voltage I/O - engineers must consult the datasheet's VCCINT and VCCIO pin assignments before laying out mixed-voltage rails, because mis-wiring can permanently damage the input buffers. Because the FLEX 8000 family is EOL with no new designs recommended for production, new designs should target Cyclone IV/V or MAX series unless a true drop-in is required for repair/maintenance. The configuration memory is volatile, so an external PROM or microcontroller is required to load the bitstream at power-up. This page synthesizes distributor availability, drop-in alternatives, and practical design notes not typically found in the manufacturer datasheet.
EPF8820ARI208-4 - FLEX 8000 FPGA, 8K Gates, 5V, 208-RQFP | Intel / Altera
The Intel / Altera EPF8820ARI208-4 is a member of the FLEX 8000 family of SRAM-based, in-system programmable CMOS FPGAs, integrating approximately 8,000 usable gates, 672 logic cells, and 820 flip-flops into a 208-pin ceramic RQFP package rated for industrial temperature operation. It is fabricated on a 0.42 µm CMOS process and operates at a nominal 5 V supply (4.5 V to 5.5 V) with configurable I/O that supports either 3.3 V or 5 V interface levels, allowing direct bridging between legacy 5 V buses and modern 3.3 V peripherals. The device delivers up to 125 MHz internal performance and uses Altera's patented FastTrack Interconnect architecture with continuous, predictable routing delays that simplify static timing closure. An FPGA (Field Programmable Gate Array) is a programmable logic device that combines configurable logic blocks, programmable interconnect, and I/O cells on a single die, allowing engineers to implement custom digital logic without the cost or lead-time of an ASIC. The FLEX 8000 family sits within the hierarchy of programmable logic devices (PLD) and specifically within the SRAM-based FPGA segment - it is volatile and must be configured from an external EPROM, Flash, or microcontroller on every power-up. This makes FLEX 8000 parts well suited to prototyping, low-volume designs, and systems requiring in-system updates via JTAG. Key features of the EPF8820ARI208-4 include a high-density interconnect structure with four row- and column-based interconnect channels, multi-level routing resources (direct, local, row, and column), and built-in JTAG boundary-scan (IEEE Std 1149.1) for board-level testability. The architecture provides bidirectional I/O pins with tri-state control, programmable slew-rate and pull-up options, and dedicated clock and global control signal networks supporting low-skew distribution across the die. Typical applications for the EPF8820ARI208-4 include industrial glue logic, bus-interface bridges between 5 V and 3.3 V domains, replacement of multiple 74-series discrete logic ICs, state-machine controllers for instrumentation, and legacy system modernization where deterministic routing delays ease timing closure in industrial-grade hardware. Designers also leverage this part in telecom line-card controllers and aerospace test fixtures where ceramic RQFP and industrial temperature ratings are mandatory. When designing with the EPF8820ARI208-4, ensure that a configuration source (EPC configuration EPROM, Flash, or controller) is always present because the SRAM cells lose configuration at every power-down. JTAG signals TCK, TMS, TDI, and TDO must be pulled correctly per IEEE 1149.1, and unused I/O pins should be set to tri-state to minimize supply noise. Ceramic RQFP packages should be socketed or hand-soldered with care, as the lead finish and larger thermal mass differ from plastic QFP. This page synthesizes distributor pricing, FLEX 8000 family drop-in alternatives, pinout, and lifecycle notes for the EPF8820ARI208-4 in a single reference - information that the Altera datasheet and distributor listings alone do not aggregate.
EPF8820ARI208-4H - 8K Gates FLEX 8000 PLD, 208-Pin PQFP | Altera
The Altera EPF8820ARI208-4H is a loadable Programmable Logic Device (PLD) from the FLEX 8000 family, delivering 8,000 usable gates, 672 logic cells, and 820 flip-flops in a 208-pin Plastic Quad Flatpack (PQFP) package with 0.5 mm terminal pitch. Built on a 0.42 micrometer CMOS process, the device operates from a 4.5 V to 5.5 V supply with a typical nominal voltage of 5 V, supports configurable I/O operation at either 3.3 V or 5 V, and is characterized for the industrial temperature grade. The architecture combines 4 dedicated inputs with 148 I/O lines (totaling 152 inputs) and propagation delay of 5.5 ns at the -4 speed grade, enabling 125 MHz operation in glue-logic, bus-interface, and state-machine roles. What is a FLEX 8000 Programmable Logic Device? FLEX 8000 is Altera's first-generation SRAM-based PLD family, positioned hierarchically as a PLD -> programmable logic -> logic IC -> integrated circuit. It preceded modern FPGAs by combining look-up-table based logic elements with continuous interconnect, giving engineers ASIC-like density without mask costs. FLEX 8000 parts run on 5 V with 3.3 V-capable I/O, bridging legacy TTL systems and newer 3.3 V peripherals; later FPGAs (Cyclone, MAX) replaced FLEX 8000 but kept the same pin-compatible footprints for many packages, simplifying upgrades. Key features include 8K equivalent gates, 672 logic elements, 820 flip-flops, 152 inputs (4 dedicated + 148 I/O), propagation delay of 5.5 ns, 125 MHz internal performance, in-system programmability via SRAM configuration, and JTAG support. The RQFP-208 package offers gull-wing leads suitable for surface-mount assembly on standard 0.5 mm-pitch land patterns. Technically, FLEX 8000 uses a row-and-column interconnect fabric with embedded array blocks (EABs) for memory functions; the EPF8820 includes eight EABs of 2 Kbits each. The 4 dedicated inputs feed a fast global clock network shared across all logic elements, while 148 bidirectional I/O pins are organized in I/O banks supporting either 3.3 V or 5 V reference standards. The -4H speed grade in this MPN indicates an enhanced -4 speed bin, and the 'H' suffix denotes a specific thermal or test-screen characteristic; refer to the manufacturer datasheet for the exact 'H' definition. Typical applications include legacy telecommunications backplanes, industrial bus bridges (PCI, VME, ISA), protocol converters, and glue-logic consolidation on 5 V motherboards. Its 5 V tolerance and 3.3 V I/O capability also make it suitable for mixed-voltage systems. When designing with the EPF8820ARI208-4H, ensure the 5 V supply is well-decoupled near the VCC pins, keep configuration data stable at power-up, and verify JTAG chain integrity for in-field updates. The PQFP-208 footprint allows direct reuse of legacy FLEX 8000 layout patterns. This page synthesizes current distributor pricing, drop-in same-family alternatives, and practical design notes that complement the official Altera datasheet.
EPF8820ARI208-4N - FLEX 8000 FPGA 8K Gates 672 Cells 5V RQFP-208 | Altera
The Altera (Intel PSG) EPF8820ARI208-4N is a member of the legacy FLEX 8000 family of SRAM-based Field-Programmable Gate Arrays (FPGAs), integrating 8K usable gates, 672 logic cells, and 820 flip-flops into a 208-pin RQFP (Power Quad Flat Pack) package. It is fabricated on a 0.42 µm CMOS process and operates from a nominal 5 V supply (4.5 V to 5.5 V), with configurable I/O standards at 3.3 V or 5 V. The device is rated for industrial temperature operation and supports system clock frequencies up to 125 MHz. An FPGA (Field-Programmable Gate Array) is a semiconductor device built around an array of configurable logic blocks (CLBs), programmable interconnect, and programmable I/O cells. It sits in the broader hierarchy of programmable logic devices (PLD) -> CPLD/FPGA -> programmable logic -> digital IC -> semiconductor. FPGAs allow designers to implement custom digital logic, glue functions, state machines, and modest datapath blocks after PCB fabrication, eliminating mask and NRE costs. The FLEX 8000 family specifically targets high-volume, cost-sensitive glue-logic and bus-interface applications where small-to-medium gate counts and 5 V tolerance are required. Key features of the EPF8820ARI208-4N include 8K typical gates (672 logic elements), 820 flip-flops, embedded array blocks (EABs) for memory, configurable I/O supporting 3.3 V and 5 V levels, in-system programmability through a JTAG/IEEE 1149.1 interface, and a maximum operating frequency of 125 MHz. The RQFP-208 package provides 152 user I/O pins and a Gull-wing lead form suitable for surface-mount assembly. Technically, the device uses a continuous FastTrack interconnect routing architecture with segmented horizontal and vertical paths, providing predictable timing delays regardless of place-and-route. Each logic element combines a 4-input look-up table (LUT), a programmable register, and a carry/chain structure. Embedded Array Blocks (EABs) can be configured as 256×8, 512×4, 1024×2, or 2048×1 memory blocks, enabling on-chip RAM/ROM for FIFO and lookup-table functions. Typical applications include industrial glue-logic replacement, bus-interface bridging (ISA, PCI, VME), legacy telecommunications backplane controllers, military/aerospace retrofits, and educational development platforms. The 5 V tolerant I/Os make it a natural fit for legacy 5 V systems that cannot tolerate modern 1.8 V/2.5 V/3.3 V FPGAs. When designing with this part, note that it is a legacy device on Altera/Intel PSG's product lifecycle. New designs should evaluate Cyclone IV or Cyclone 10 LP for 3.3 V I/O compatibility, but those are not pin-compatible drop-in upgrades. Existing designs using this part should plan for EOL/EOS risk and verify long-term supply with distributors. This page synthesizes distributor pricing, drop-in same-package alternatives drawn from the Altera FLEX 8000 family, and practical design notes not found in the manufacturer datasheet.
EPF8820ARQ208-3N - FLEX 8000 FPGA 8K Gates 672 Cells 5V RQFP-208
The Intel (formerly Altera) EPF8820ARQ208-3N is a FLEX 8000 family Field-Programmable Gate Array (FPGA) delivering 8,000 typical gates, 672 logic cells, and 152 user I/O pins in a 208-pin Power Quad Flat Pack (RQFP) package. Built on a 0.42 µm CMOS SRAM process and rated for 5V operation, this device supports system clock rates up to 125 MHz and is configured at power-up from an industry-standard parallel EPROM, an Altera serial configuration device (EPC1, EPC1064, EPC1213, EPC1441), or a system controller. The -3N speed grade indicates the commercial temperature range and a specific timing bin, with the 'N' suffix denoting lead-free / NiPdAu lead finish. A Field-Programmable Gate Array (FPGA) is a type of programmable logic device (PLD) that contains an array of configurable logic blocks (CLBs), programmable interconnects, and configurable I/O cells, all of which are defined by SRAM configuration bits loaded at power-up. FPGAs sit at the top of the digital logic hierarchy: programmable logic device (PLD) -> FPGA -> high-density SRAM-based FPGA. The FLEX 8000 series was Altera's first-generation family to combine fine-grained logic elements with continuous interconnect, enabling integration of 32-bit buses and high-pin-count glue-logic functions that previously required multiple TTL/CMOS devices. Key features include 8,000 typical gates (approximately 16,000 maximum gates), 672 logic elements (LEs), 152 user I/O pins, and embedded SRAM configuration memory. The device operates from a single 5 V supply with 3.3 V or 5 V I/O compatibility and provides in-system programmability (ISP) via the serial configuration interface. Continuous FastTrack interconnect delivers predictable timing across the die, and the four FastRow interconnect structures support high-speed row-to-row signal paths. The architecture is supported by the MAX+PLUS II and Quartus design environments for schematic, VHDL, and Verilog entry. Typical applications include 32-bit bus integration, peripheral bridging, custom microcontroller peripherals, glue-logic replacement for TTL/CMOS designs, industrial control interfaces, telecommunications line cards, and legacy 5V system upgrades. The high I/O count (152 signals) makes it well-suited to designs that need to consolidate multiple standard logic devices into a single package while maintaining 5V-tolerant I/O for direct connection to legacy buses. When designing with this part, pay attention to the I/O supply voltage (5 V VCCIO is required for 5V TTL inputs), and ensure the configuration scheme (EPC1/EPC2 serial or parallel EPROM) matches the board's boot infrastructure. The 208-pin RQFP has an exposed thermal pad that should be soldered to a copper pour to meet the commercial 0 to 70 °C operating range. The FLEX 8000 family is now mature and approaching end-of-life; users designing new boards should plan around the ACTEL/ProASIC3, Lattice ispMACH, or modern Cyclone families. However, the EPF8820ARQ208-3N remains widely available on the secondary market for sustaining legacy designs. This page synthesises distributor stock, same-package drop-in alternatives within the FLEX 8000 family, and practical design notes not found in the original datasheet, giving engineers a single reference for procurement, replacement, and obsolescence planning.
EPF8820ATC100-2 - FLEX 8000 FPGA 672 LC, TQFP-100 | Altera
The Altera EPF8820ATC100-2 is a member of the FLEX 8000 family of SRAM-based Field-Programmable Gate Arrays, delivering 672 logic elements (LEs) in a 100-pin Thin Quad Flat Pack (TQFP-100) package. It supports a maximum of 124 user I/O pins and offers on-chip RAM of approximately 6,144 RAM bits, providing a flexible fabric for glue logic, bus interfacing, and custom state-machine integration in legacy and industrial designs. An FPGA (Field-Programmable Gate Array) is a semiconductor integrated circuit composed of an array of configurable logic blocks, programmable interconnect, and I/O cells that can be reconfigured by the customer after manufacturing. FPGAs sit hierarchically under programmable logic devices (PLDs), parallel to CPLDs (Complex PLDs), and are widely used to implement glue logic, custom peripherals, and parallel DSP operations. The FLEX 8000 family is Altera's classic SRAM-based FPGA line, requiring an external configuration memory device (typically an EPC or serial flash) on every power-up because the SRAM cells are volatile. Key features of the EPF8820ATC100-2 include 672 logic elements, 124 maximum user I/O pins, 6 Kbits of embedded RAM, and a -2 speed grade representing the medium-speed bin of the family. The TQFP-100 surface-mount package with 0.5 mm pitch enables standard reflow assembly and is one of the most widely footprint-supported packages in legacy designs. The device operates from a 5 V tolerant I/O supply and a 3.3 V core supply on earlier FLEX 8000 revisions. Architecturally, the EPF8820ATC100-2 uses Altera's classic Logic Element (LE) structure, each consisting of a 4-input look-up table (LUT), a programmable register, and a carry chain for arithmetic. FastRow and FastColumn interconnect lines route signals between LEs and I/O elements with deterministic delays defined by the Quartus/MAX+PLUS II toolchain. The device is configured via the passive serial (PS), passive parallel synchronous (PPS), or active serial (AS) modes, and is in-system programmable through the JTAG-compatible interface. Typical applications include industrial control glue logic, telecommunications backplane interfacing, legacy peripheral emulation, prototyping bridges, and educational FPGA platforms. Engineers often select this part for drop-in replacement of original FLEX 8000 designs where a long-lifecycle pin-compatible Altera/Intel part is required. When designing with this part, provide a stable configuration source (EPC1, EPC2, or compatible flash) and decouple the 5 V and 3.3 V rails with 0.1 uF and 10 uF capacitors near the package. Note that the FLEX 8000 family has been superseded by newer Cyclone and MAX families; new designs should consider Cyclone IV or MAX V for long-term supply assurance. This page synthesizes distributor pricing, package-level drop-in alternatives, and practical design notes that complement the legacy Altera datasheet, helping procurement and design engineers confirm supply options quickly.
EPF8820ATC100-2N - FLEX 8000 FPGA, 672 LEs, TQFP-100 | Altera
The Intel (Altera) EPF8820ATC100-2N is a member of the FLEX 8000 family of SRAM-based FPGAs, delivering 672 Logic Elements (LEs), 8 FastTrack Interconnect rows, and 672 flipflops in a 100-pin TQFP (TC100) surface-mount package with industrial operating temperature range. Built on a 0.42 µm CMOS SRAM process, it provides configurable logic blocks (LABs) of 8 LEs each and supports in-system reconfiguration via standard configuration EPROMs or Altera EPC1/EPC1213/EPC1064/EPC1441 serial devices. The FLEX 8000 family combines the architectural advantages of both erasable programmable logic devices (EPLDs) and field-programmable gate arrays (FPGAs). As a CPLD/FPGA hybrid class, FLEX 8000 devices occupy the mid-density programmable logic hierarchy between small PLDs and high-end SRAM FPGAs: they fit above simple gate arrays (PAL/GAL), alongside early-generation CPLDs, and below modern high-density FPGAs in both logic capacity and pin count. Key features include 8 Embedded Array Blocks (EABs) for implementing RAM, ROM, or FIFO functions, tri-state buffer emulation on every I/O pin for bus-oriented designs, and a -2 speed grade suitable for commercial logic integration. The device supports JTAG boundary-scan testing, conforms to PCI bus interface standards with appropriate clamping, and provides 5V-tolerant I/O on the 5.0V VCCIO variant. The TQFP-100 (TC100) 14x14 mm package offers a thermal resistance theta_JA of approximately 47 C/W with standard PCB copper. Typical applications include legacy industrial control systems, glue-logic replacement for discrete 74-series TTL, PCI bus interface bridges, multi-drop bus arbitration, and embedded controller co-processing. The 672-LE capacity suits designs that exceed simple PLD capability but do not require modern high-density FPGAs, making the FLEX 8000 family a cost-effective upgrade path for mature designs. When designing with this device, ensure configuration is loaded from a valid serial or parallel EPROM at every power-up. Provide a clean 5V core supply with decoupling capacitors placed close to VCC pins, and respect setup/hold times for the -2 speed grade. The TC100 package requires a 1.0 mm pitch PCB land pattern and standard reflow profile for surface-mount assembly.
EPF8820ATC144-1 - FLEX 8000 FPGA, 672 Cells, 112 I/O, 144-TQFP | Altera
The Altera (now Intel) EPF8820ATC144-1 is a member of the FLEX 8000 family of CMOS SRAM-based Field Programmable Gate Arrays (FPGAs) housed in a 144-pin Thin Quad Flat Pack (TQFP) package. It provides 672 logic cells across 84 Logic Array Blocks (LABs), 112 user I/O pins, and an equivalent gate count of approximately 8,000 usable gates, operating from a 5V supply. The trailing "-1" speed grade indicates the slowest of the FLEX 8000 speed bins, suitable for cost-sensitive, non-timing-critical applications. An FPGA (Field Programmable Gate Array) is a type of integrated circuit containing an array of programmable logic blocks, interconnect resources, and configurable I/O cells that engineers can customize after manufacture. FPGAs sit between fixed-function ASICs and CPLDs in the programmable logic hierarchy, offering higher logic density than CPLDs while remaining factory-reprogrammable. The FLEX 8000 family is configured at system power-up from an industry-standard parallel EPROM, an Altera serial configuration device (EPC1, EPC1064, EPC1213, or EPC1441), or a system controller, and supports MultiVolt I/O for interfacing with 3.3V or 5.0V logic rails. Key features include in-circuit reconfigurability (ICR) via external configuration devices, MultiVolt I/O pin operation, a built-in Joint Test Action Group (JTAG) boundary-scan test interface per IEEE Std. 1149.1, and global routing resources for clock and control distribution. The EPF8820ATC144-1 is fabricated on a 5V CMOS process with SRAM configuration memory and is specified for the commercial operating temperature range of 0C to 70C. Typical applications include glue logic replacement, custom state-machine controllers, bus-interface bridging, and peripheral emulation in industrial control, telecom, and embedded computing systems. The FLEX 8000 architecture is register-rich, with the EPF8820A device providing up to 1,500 flip-flops, making it well-suited to pipelined datapath and small processor glue-logic roles. When designing with this device, ensure that the configuration scheme is selected and validated before PCB fabrication because FLEX 8000 devices are SRAM-based and lose configuration when power is removed. Plan for a non-volatile configuration memory on the board, and verify that JTAG chain ordering, voltage-level translation, and decoupling are sized for the 5V supply rail. For new designs consider Cyclone IV or Cyclone V as modern, lower-power successors. This page synthesizes distributor stock and pricing, pin-compatible drop-in alternatives within the FLEX 8000 family, and practical design notes not consolidated on the manufacturer datasheet.
EPF8820ATC144-10 - 672-Cell FLEX 8000 FPGA, 144-LQFP, 10ns | Altera
The Altera EPF8820ATC144-10 is a member of the FLEX 8000 family of CMOS SRAM-based FPGAs, integrating approximately 8,000 usable gates, 672 logic cells, and 84 Logic Array Blocks (LABs) in a 144-pin LQFP (Low-profile Quad Flat Pack) package. Speed grade -10 corresponds to a 10 ns pin-to-pin propagation delay through the logic element, making it the slowest member of the EPF8820A speed-grade ladder. The device is fabricated on a 0.42 µm CMOS process and operates from a 5 V supply with MultiVolt I/O capability allowing 3.3 V or 5.0 V interface voltages on all packages except specific 84-pin variants. What is an FPGA? A Field-Programmable Gate Array (FPGA) is a semiconductor device containing configurable logic blocks, programmable interconnect, and I/O cells that can be re-programmed after manufacturing to implement arbitrary digital functions. Within the taxonomy, the EPF8820ATC144-10 sits inside the broader hierarchy: FPGA -> programmable logic device (PLD) -> logic IC -> integrated circuit. The FLEX 8000 family pioneered Altera's fine-grained LAB architecture for medium-density glue-logic and bus-interface applications in the 1990s, before being superseded by FLEX 10K and Cyclone families. Key features include 112 user I/O pins, in-circuit reconfigurability (ICR) via external serial or parallel EPROM, and configuration support through Altera EPC1, EPC1213, EPC1064, and EPC1441 configuration devices. The 144-pin LQFP package has a 0.5 mm terminal pitch and supports surface-mount assembly with standard JEDEC footprints. Operating temperature range is commercial 0 °C to 70 °C. Architecturally, the EPF8820ATC144-10 uses CMOS SRAM configuration memory, meaning the design bitstream must be reloaded at every power-up from an external non-volatile store. This makes it suitable for prototyping and volume production where the design may evolve, and the same PCB can host different gateware revisions. Typical applications include industrial glue logic, bus-interface bridges (ISA, PCI, VME), prototyping platforms for ASIC replacement, and legacy system upgrades where 5 V-tolerant I/O is required. The MultiVolt I/O feature is particularly useful when bridging between 3.3 V peripherals and 5 V backplanes. For new designs the FLEX 8000 family is obsolete; engineers should evaluate Altera/Intel MAX II, MAX V, or Cyclone IV for new designs, while the EPF8820ATC144-10 remains useful for maintaining installed equipment. When designing with this part, ensure the configuration EPROM is sized correctly for the bitstream and that JTAG or Altera ByteBlaster programming access is reserved on the PCB for factory programming and field updates. Use I/O registers in the LABs for registered outputs to meet timing on the 10 ns grade. This page synthesizes distributor pricing, drop-in speed-grade alternatives, and application guidance not consolidated on a single manufacturer page.
EPF8820ATC144-11 - FLEX 8000 FPGA 8K Gates 144-TQFP | Altera
The Intel (formerly Altera) EPF8820ATC144-11 is a member of the FLEX 8000 family of CMOS SRAM-based Field Programmable Gate Arrays, integrating 8,000 usable gates and 672 logic cells in a 144-pin TQFP (Plastic Thin Quad Flat Pack) package. Speed grade -11 indicates a specific propagation-delay bin, with the wider FLEX 8000 family operating up to 125 MHz internally and supporting 112 user I/O in this TQFP-144 form factor. Supply voltage is 5.0 V nominal with MultiVolt I/O capability (3.3 V or 5.0 V tolerance). A Field Programmable Gate Array (FPGA) is a programmable logic device (PLD) whose logic and interconnections are configured by CMOS SRAM cells, distinguishing it from CPLDs (which use non-volatile fuses or flash) and ASICs (custom-masked). Architecturally, an FPGA sits between a CPLD and a hard-masked ASIC in the programmable-logic taxonomy, and within the FLEX 8000 family it provides higher register counts than the smaller EPF8282A and lower density than the EPF81188A / EPF81500A. The FLEX 8000 family uses a fine-grained, register-rich architecture optimized for register-intensive datapaths and in-circuit reconfigurability. Key features of the EPF8820ATC144-11 include: 8,000 usable gates, 672 logic cells, 112 user I/O pins, 125 MHz internal operation, 0.42 µm CMOS SRAM process, MultiVolt I/O interface, in-circuit reconfigurability (ICR) via external serial/parallel EPROM or Altera EPC1/EPC1213/EPC1064/EPC1441 configuration devices, JTAG boundary-scan support, and a commercial operating temperature range of 0 °C to 70 °C. The 144-pin TQFP package measures 20 mm × 20 mm with 0.5 mm pitch. The FLEX 8000 architecture is built from Logic Array Blocks (LABs) interconnected by a continuous FastTrack interconnect. Each LAB contains multiple Logic Elements (LEs) — the basic building blocks comprising a 4-input look-up table, a programmable register, and a carry chain for arithmetic. This register-rich architecture makes FLEX 8000 well-suited to state machines, datapath controllers, and bus-interface glue logic rather than purely combinational designs. Typical applications include glue-logic integration on legacy 5 V ISA/PCI motherboards, industrial control PLCs, telecommunications backplane glue logic, prototyping for ASIC migration, military/aerospace legacy systems, and educational FPGA development platforms. The MultiVolt I/O allows direct interfacing with both 3.3 V and 5.0 V devices without level shifters. When designing with this device, ensure the chosen configuration device (EPC1, EPC1213, EPC1064, or EPC1441) matches the bitstream size. JTAG programming requires the TCK/TMS/TDO/TDI pins to be pulled correctly and a BSDL file from the FLEX 8000 family datasheet. This page synthesizes distributor stock, drop-in Altera/Intel alternatives, and configuration-design guidance beyond the bare datasheet — covering compatibility with the FLEX 8000 family lineup and modern supply-chain alternatives.
EPF8820ATC144-12 - FLEX 8000 FPGA 8K Gates 144-TQFP | Altera
The Altera (Intel) EPF8820ATC144-12 is a member of the FLEX 8000 family of SRAM-based Field-Programmable Gate Arrays, delivering approximately 8,000 usable gates in a 144-pin TQFP (Thin Quad Flat Pack) package. The device integrates 672 logic cells organized into 84 Logic Array Blocks (LABs) and provides 112 user I/O pins, supporting 5.0V core and MultiVolt I/O operation for 3.3V or 5.0V interface compatibility. The -12 speed grade denotes the slowest timing bin in the FLEX 8000 lineup, optimized for cost-sensitive designs where maximum clock frequency is not the primary constraint. An FPGA (Field-Programmable Gate Array) is a type of programmable logic device (PLD) that allows designers to configure digital logic functions after manufacture. FPGAs sit in the semiconductor hierarchy as follows: FPGA -> programmable logic device -> logic IC -> integrated circuit. The FLEX 8000 family uses a continuous SRAM configuration cell architecture, which enables in-system reconfiguration and rapid prototyping without requiring external boot ROM in development environments. The architecture supports MultiVolt I/O, which is particularly valuable for mixed-voltage systems where the FPGA bridges 5V peripherals and 3.3V ASICs. Key features include 8,000 typical gates (4,500 usable gates), 672 logic elements, 84 LABs, 112 maximum user I/O pins, 5V VCCINT with selectable 3.3V/5.0V VCCIO, fine-grained Look-Up Table (LUT) based logic, fast interconnect routing, and JTAG-based boundary-scan testing. The -12 speed grade offers relaxed timing margins, making it suitable for glue logic, bus interfacing, and state-machine replacement applications where timing closure is straightforward. The FLEX 8000 architecture employs a hierarchical routing structure with FastTrack interconnect, which provides predictable timing and efficient silicon utilization. Configuration data is loaded at system power-up from an industry-standard parallel EPROM, an Altera serial configuration device (EPC1, EPC1213, EPC1064, or EPC1441), or a system controller. The CMOS SRAM configuration approach enables unlimited reconfiguration cycles, supporting iterative development flows and field upgrades. Typical applications include telecommunications interface cards, industrial control systems, glue logic between microprocessors and peripherals, legacy system replacement, and prototyping platforms for ASIC emulation. The 144-pin TQFP package supports both surface-mount manufacturing and hand-soldering for low-volume or repair scenarios, making the EPF8820ATC144-12 a flexible choice for both production and development environments. When designing with this device, note that the -12 speed grade is the slowest in the family; engineers targeting higher clock frequencies should select -10 or -4 speed grades. The MultiVolt I/O feature requires explicit VCCIO selection (3.3V or 5.0V) per bank, and configuration time depends on the selected configuration device and clock source. This page synthesizes distributor pricing, drop-in same-package speed-grade alternatives, and design considerations not consolidated in the original Altera FLEX 8000 datasheet, providing an independent reference for engineers sourcing legacy Altera/Intel FPGA inventory.
EPF8820ATC144-15 - FLEX 8000 FPGA 8K Gates 672 Cells | Altera
The Altera EPF8820ATC144-15 is a member of the FLEX 8000 family of CMOS SRAM-based Field Programmable Gate Arrays, providing approximately 8,000 usable gates, 672 logic elements (also called registers), and 112 user I/O pins in a 144-pin TQFP (also referred to as LQFP) package. The "-15" speed grade denotes a tpd (pin-to-pin delay) of approximately 15 ns, which positions it in the mid-speed tier of the FLEX 8000 series and makes it suitable for control logic, glue logic, and bus-interface bridges running at moderate clock rates. The device operates from a 5 V core supply and supports MultiVolt I/O, allowing 3.3 V or 5 V interfacing on the same silicon. A Field Programmable Gate Array (FPGA) is a semiconductor device whose logic and interconnections are configured by the user via SRAM configuration memory, placing FPGAs in the broader hierarchy of programmable logic devices (PLDs) -> FPGAs -> CMOS programmable logic. The FLEX 8000 family pioneered fine-grained logic element architecture with FastTrack continuous interconnect routing, sitting between classic EPLDs and later Cyclone-class devices in Altera's product lineage. The FLEX 8000 architecture is designed for high pin count and register-rich designs. Key features of the EPF8820ATC144-15 include in-system reconfigurability via serial or parallel configuration devices (EPC1, EPC1064, EPC1213, EPC1441), JTAG support via the IEEE 1149.1 boundary-scan interface, and MultiVolt I/O for mixed-voltage system integration. The 144-pin TQFP package is JEDEC-compliant and surface-mountable, supporting industrial-grade thermal ranges. The CMOS SRAM technology provides low static power and unlimited re-programmability, in-circuit reconfigurability (ICR) being a hallmark of the FLEX 8000 family. Architecturally, the EPF8820ATC144-15 implements 672 logic elements arranged into Logic Array Blocks (LABs), each LAB containing eight LEs with a local interconnect. The device is fabricated on a 5 V CMOS process with four-layer metal interconnect, with FastTrack routing providing predictable timing. Per the FLEX 8000 datasheet family, the -15 speed grade supports internal clock frequencies up to 125 MHz depending on design density, making it well suited for controller, bus-interface, and coprocessor roles. Typical applications include bus-interface bridging (e.g., between 5 V and 3.3 V domains), TTL integration for legacy system consolidation, coprocessor functions for microprocessor systems, high-speed controllers in industrial equipment, and digital signal processing glue logic. The 112 user I/Os are sufficient to integrate multiple 32-bit buses within a single device, replacing several discrete TTL packages. Designers select this part when they need a cost-effective 5 V FPGA with moderate logic density and a manageable TQFP footprint. When designing with the EPF8820ATC144-15, verify that your timing closure requirements fall within the 15 ns speed grade budget; if your design requires tighter timing, consider -3, -4, or -10 speed grade variants in the same package. The MultiVolt I/O feature allows mixed-voltage interfacing but requires careful VCCIO rail planning. Because the FLEX 8000 family is mature, lead time and inventory on the secondary market should be verified before committing to a new design. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet, helping engineers select the right speed grade and package variant for legacy 5 V FPGA designs.
EPF8820ATC144-2 - FLEX 8000 FPGA, 672 Cells, 112 I/O, 144-LQFP | Intel
The Intel (formerly Altera) EPF8820ATC144-2 is a member of the FLEX 8000 family of high-density CMOS SRAM-based Field Programmable Gate Arrays, offering 672 logic cells and approximately 8,000 usable gates in a 144-pin LQFP (TQFP) package. The -2 speed grade balances device performance against power consumption for cost-sensitive commercial designs, with 112 user I/O pins for interface connectivity. The part operates from a 5V supply across the commercial 0C to 70C temperature range. A Field-Programmable Gate Array (FPGA) is a type of programmable logic device (PLD) built around an array of configurable logic blocks (CLBs) embedded in a programmable interconnect fabric. In the FLEX 8000 hierarchy, the device sits under FLEX 10K as a register-rich, register-rich CMOS PLD family offering system-level features such as in-circuit reconfigurability (ICR) via external configuration devices or intelligent controllers, and full PCI Local Bus Specification compliance. This category positions FLEX 8000 between classic CPLDs (lower density, faster I/O) and modern FPGAs (higher density, embedded memory). Key features include 84 Logic Array Blocks (LABs), 112 user I/O pins, multiVolt I/O support, and compatibility with industry-standard configuration EPROMs and Altera serial configuration devices (EPC1, EPC1064, EPC1213, EPC1441). The architecture is built on a 0.42 micrometer CMOS process, supporting PCI-compliant I/O signalling for plug-and-play peripheral designs. Typical applications include PCI bus interface glue logic, industrial control state machines, glue logic for legacy microprocessor systems, prototyping of custom ASICs, and bus-bridging in embedded designs. Designers also use FLEX 8000 parts for replacing multiple discrete PLDs and 74-series TTL in single-chip form factors. When designing with the EPF8820ATC144-2, ensure external configuration memory is sized for the bitstream and that JTAG or passive serial configuration is supported by the system controller. The LQFP-144 package allows hand-soldering and inspection, simplifying prototyping and low-volume production. Always verify PCI signalling compliance against the target revision of the PCI Local Bus Specification. This page synthesises distributor inventory, drop-in same-package alternatives from the Site MPN catalogue, and practical configuration guidance not consolidated in the legacy FLEX 8000 datasheet.
EPF8820ATC144-2N - FLEX 8000 FPGA 8K Gates 144-TQFP | Altera
The Altera (Intel) EPF8820ATC144-2N is a FLEX 8000 family Field-Programmable Gate Array (FPGA) delivering 8,000 usable gates, 672 logic elements, and 112 user I/Os in a 144-pin Thin Quad Flat Pack (TQFP) package. Built on a 0.42 µm CMOS SRAM process and operating from a 5 V supply, it supports in-circuit reconfigurability through external configuration EPROMs or Altera EPC1/EPC1064/EPC1213/EPC1441 serial configuration devices, enabling system-level flexibility for prototyping and field updates. A Field-Programmable Gate Array (FPGA) is a programmable logic device (PLD) containing an array of configurable logic blocks (CLBs), programmable interconnect, and I/O cells that an engineer can program to implement arbitrary digital logic, glue logic, bus interfaces, state machines, and signal-processing datapaths. Within the broader taxonomy, FPGAs sit alongside CPLDs in the programmable logic hierarchy and are categorized under Integrated Circuits > FPGA & CPLD. FLEX 8000 was Altera's register-rich, high-density family positioned between simpler Classic EPLDs and the larger FLEX 10K family that introduced embedded array blocks. Key features of the EPF8820ATC144-2N include 84 logic array blocks (LABs), 112 maximum user I/O pins, and a maximum toggle frequency of 125 MHz. The device supports multi-voltage I/O operation (TTL and CMOS interfaces) and offers fast in-system configuration via the FLEX configuration scheme. The high-pin-count 144-TQFP package integrates multiple 32-bit buses into a single device, allowing dense glue-logic and peripheral-bridge designs. The EPF8820ATC144-2N uses Altera's classic 4-input look-up table (LUT) architecture with a continuous routing network, providing predictable timing and good register-to-logic ratios suited for state machines, datapath registers, and address decoding. The 5 V core is robust for legacy industrial interfaces and TTL buses. Typical applications include TTL and bus integration (PCI bridges, ISA glue logic), high-speed controllers, coprocessor functions, DSP preprocessing, wide-data-path manipulation, and address/data translation between mismatched processor peripherals. The 112 I/Os comfortably handle 32-bit datapaths plus control. When designing with this part, ensure correct configuration mode selection (FLEX configuration scheme), proper decoupling of the 5 V rail, and observance of TQFP-144 PCB land pattern guidelines for reliable hand or reflow soldering. This page consolidates distributor stock, drop-in alternatives, and application notes not always present in the bare datasheet PDF, serving engineers searching for a FLEX 8000 FPGA cross-reference.
EPF8820ATC144-3 - FLEX 8000 FPGA, 672 LE, 144-LQFP | Intel/Altera
The Intel (formerly Altera) EPF8820ATC144-3 is a member of the FLEX 8000 family of high-density CMOS SRAM-based Field Programmable Gate Arrays (FPGAs), delivering approximately 8,820 usable logic elements with 672 logic elements (LEs), 84 Logic Array Blocks (LABs), and 112 user I/Os, all housed in a 144-pin LQFP (also referred to as TQFP 20x20 mm) package. It supports a single 5.0 V supply rail (VCCINT 4.75 V-5.25 V) with selectable VCCIO for 3.3 V or 5.0 V I/O standards, includes 16,000 usable gates with up to 1,500 registers, and operates over the commercial 0 C to +70 C temperature range. What is a FLEX 8000 FPGA? The FLEX (Flexible Logic Element matriX) 8000 family is a register-rich, low-cost, high-density CMOS programmable logic family based on a look-up table architecture with embedded SRAM configuration memory. In the broader hierarchy, it sits below programmable logic devices (PLDs) and field-programmable gate arrays (FPGAs), which are themselves a class of semiconductor integrated circuits that implement arbitrary digital logic via user-programmable configuration rather than fixed mask-defined interconnects. FLEX 8000 devices introduced system-level features such as in-circuit reconfigurability (ICR) via external configuration devices, multi-volt I/O, and built-in JTAG boundary-scan testing. Key features include in-system programmability through the IEEE 1149.1 (JTAG) interface or Altera EPC serial configuration devices, multi-volt I/O supporting both 3.3 V and 5.0 V interfaces, and interconnect-rich fine-grained architecture based on continuous FastTrack routing. The architecture combines 4-input look-up tables in each LE with a dedicated carry chain for arithmetic and a cascade chain for wide fan-in functions, enabling high logic density at low cost. Configuration RAM is volatile and must be reloaded at every power-up, supporting in-circuit reconfigurability for field upgrades. Typical applications include glue-logic replacement on legacy 5 V PCI, ISA, and VME boards, industrial control and factory automation controllers, telecommunications interface glue logic, and high-volume consumer equipment that benefits from logic integration. The device is also widely used in educational hardware and retro-computing projects that require an authentic 5 V-era FPGA. The -3 speed grade offers a balance of speed and cost suitable for most general-purpose designs operating below 100 MHz internal frequencies. When designing with this device, observe the 5.0 V VCCINT requirement - this part is NOT 3.3 V core tolerant like modern FPGAs. Use level shifters on I/O banks when interfacing with 3.3 V logic, and budget configuration time during power-up. Configuration data must be loaded from an external serial or parallel PROM on every POR event.
EPF8820ATC144-3N - FLEX 8000 FPGA, 8K Gates, 672 Cells | Intel
The Intel (Altera) EPF8820ATC144-3N is a member of the FLEX 8000 family of CMOS SRAM-based Field-Programmable Gate Arrays, delivering approximately 8,000 usable gates and 672 logic cells in a 144-pin TQFP (also described as 144-LFQFP) surface-mount package. It is fabricated on a 0.42 µm process node and operates from a 5 V supply within the commercial 0 °C to 70 °C temperature range. The -3 speed grade positions this device in the mid-tier of the FLEX 8000 performance spectrum, with an internal counter frequency benchmark commonly cited around 125 MHz. What is a FLEX 8000 FPGA? The FLEX (Flexible Logic Element matriX) 8000 is a register-rich, in-system reconfigurable programmable logic family from Altera (now Intel FPGA). FPGAs in general sit within the broader taxonomy of programmable logic devices (PLD) and belong to the digital semiconductor hierarchy: logic IC -> PLD -> CPLD/FPGA -> SRAM-based FPGA. FLEX 8000 devices are configured at system power-up by loading SRAM configuration bits from an external EPROM or from Altera EPC-series serial configuration devices (EPC1, EPC1064, EPC1213, EPC1441). The architecture provides two dedicated high-speed signal paths, carry chains and cascade chains, used to accelerate arithmetic and wide fan-in logic functions. The architecture combines a flexible logic element (LE) matrix with continuous FastTrack interconnect rows and columns. Each LE contains a 4-input look-up table (LUT) for combinatorial logic and a programmable flip-flop for sequential logic. The flip-flop clock, clear, and preset control signals can be driven by dedicated input pins, by general-purpose I/O, or by any internal logic. For purely combinatorial functions the flip-flop can be bypassed, allowing the LUT output to flow directly to the device pin. Typical applications include glue logic replacement, interface bridging, bus protocol conversion, and small to medium state-machine controllers in industrial, telecom, and embedded systems. The 152 user I/Os and 5 V tolerance make this part particularly suitable for legacy 5 V system designs where modern low-voltage FPGAs cannot be directly interfaced. System-level features include in-circuit reconfigurability (ICR) via external configuration devices, allowing field upgrades without removing the device from the board. Designers should consider the device's 5 V core supply requirement, the need for an external configuration memory, and the inherent volatility of SRAM-based configuration, which means the bitstream must be reloaded after every power cycle. Compared with lower-density CPLDs, the FLEX 8000 family offers significantly higher logic capacity and richer register resources at the cost of a larger footprint and external configuration logic. This page synthesizes distributor pricing, verified drop-in FLEX 8000 alternatives in the same 144-pin TQFP footprint, and practical configuration-design notes that go beyond the manufacturer datasheet.
EPF8820ATC144-4 - FLEX 8000 FPGA, 672 Cells, 144-TQFP | Intel
The Intel (formerly Altera) EPF8820ATC144-4 is a member of the FLEX 8000 family of SRAM-based Field Programmable Gate Arrays (FPGAs) housed in a 144-pin Thin Quad Flat Pack (TQFP) package. It integrates approximately 8,000 usable gates, 672 logic elements across 84 Logic Array Blocks (LABs), and 112 user I/O pins, fabricated on a 0.42 µm CMOS SRAM process with four input Look-Up Tables (LUTs). It operates from a 5 V core supply, supports MultiVolt I/O interfacing at 3.3 V or 5.0 V, and is offered in a -4 speed grade rated for commercial temperature operation. A Field Programmable Gate Array (FPGA) is a programmable logic device (PLD) subclass that uses an array of configurable logic blocks (CLBs / LABs), programmable interconnect, and configurable I/O cells to implement arbitrary digital logic. Within the broader taxonomy, the FLEX 8000 belongs to: FPGA → programmable logic device (PLD) → digital integrated circuit → semiconductor. FPGAs are reconfigurable in-system and are used wherever custom ASIC-like logic density and parallelism are required without the NRE cost of a mask-programmed device. Key features of the EPF8820ATC144-4 include 8K equivalent gates, 672 logic cells, 84 LABs, 112 user I/O, embedded SRAM configuration memory, MultiVolt I/O support, and on-chip JTAG-based boundary-scan test (IEEE 1149.1) for production programming. Configuration is loaded at power-up via serial or parallel PROM using Intel configuration devices such as EPC1, EPC1064, EPC1213, and EPC1441. The FLEX 8000 architecture separates logic, interconnect, and I/O into distinct structures with continuous FastTrack interconnect rows and columns, providing predictable timing across the device. The LUT-based logic element supports wide-input combinational and registered functions, while the SRAM-based configuration enables unlimited in-system re-programmability. A global clear and clock network distributes reset and clock signals across all LABs. Typical applications include industrial control glue logic, telecommunications interface bridging, test and measurement instrumentation, and legacy system prototyping. It also appears in legacy 5 V industrial bus systems where modern low-voltage FPGAs are incompatible, and in educational hardware platforms requiring a low-density, 5 V tolerant programmable device. When designing with the EPF8820ATC144-4, plan for external configuration memory (an EPC1, EPC1064, or EPC1441 serial PROM) and respect the 5 V VCCINT supply requirement. Note that this part is from a discontinued legacy family; production availability is limited to remaining distributor stock, and new designs should evaluate Intel's modern MAX II, MAX V, or Cyclone families as alternatives.
EPF8820ATC144-4N - 8K Gates, 125MHz FLEX 8000 FPGA | Intel / Altera
The Intel / Altera EPF8820ATC144-4N is a member of the FLEX 8000 family of CMOS SRAM-based Field-Programmable Gate Arrays (FPGAs), delivering 8,000 usable gates, 672 logic cells, and 84 Logic Array Blocks (LABs) with up to 112 user I/Os in a 144-pin Thin Quad Flat Pack (TQFP) package. The device is fabricated on a 0.42 µm CMOS process, operates from a single 5 V supply, and supports system clock rates up to 125 MHz, making it a high-density register-rich programmable logic solution for glue logic, bus interfacing, and state-machine control in legacy industrial and telecom designs. An FPGA is a semiconductor device built around an array of configurable logic blocks (CLBs / LABs in Altera terminology) interconnected by a programmable routing matrix and surrounded by user I/O cells. FPGAs differ from CPLDs in offering distributed flip-flops, block RAM, and richer routing, enabling implementation of wide datapath functions, FIFOs, and pipeline stages that exceed the macrocell capacity of a CPLD. The FLEX 8000 family in particular pioneered Altera's continuous FastTrack interconnect, balancing predictable timing with high logic density. Key specifications of the EPF8820ATC144-4N include 8,000 usable gates, 672 logic elements, 84 LABs, 112 user I/Os, 5 V single-supply operation, 0.42 µm CMOS technology, and a maximum internal operating frequency of 125 MHz. The device is configured at power-up via an industry-standard parallel EPROM or an Altera serial configuration device (EPC1, EPC1064, EPC1213, or EPC1441). Built-in JTAG (IEEE 1149.1) boundary-scan support and in-circuit reconfigurability simplify board-level test and field upgrades. The architecture centers on a symmetrical array of LABs connected by the FastTrack continuous interconnect hierarchy, providing fast and predictable connections between adjacent and diagonal blocks. Each LAB contains multiple logic elements (LEs), each consisting of a 4-input look-up table, a programmable flip-flop, and dedicated carry and cascade chains. The I/O ring supports a wide range of standards (TTL, CMOS) and is organized as input, output, or bidirectional cells with individual enable and clocking options. Typical applications of the EPF8820ATC144-4N include telecommunications line cards, industrial control and factory automation, glue logic on legacy VME/PCI bus systems, ASIC prototyping, and instrumentation front-ends. The wide operating temperature range (commercial, 0 to 70 °C) and TQFP-144 footprint allow direct drop-in use in designs originally specified around FLEX 8000 logic density. When designing, verify that your configuration scheme (serial vs parallel), JTAG chain, and I/O voltage standards match the FLEX 8000 reference design; pair the device with EPC1441 or EPC1064 configuration PROMs and a low-skew global clock buffer for multi-clock domains. This page synthesizes distributor inventory, drop-in same-package alternatives from the FLEX 8000 family, and practical design notes not found in the manufacturer datasheet alone.
EPF8820ATC144-6 - 8K Gates, 125MHz FLEX 8000 FPGA | Altera
The Altera EPF8820ATC144-6 is a member of the FLEX 8000 programmable logic device family, delivering approximately 8,000 usable gates, 672 logic cells, and 112 user I/Os in a 144-pin TQFP (LFQFP) package. Operating from a 5V supply at a 125MHz internal frequency, this CMOS SRAM-based FPGA provides low-cost, high-density register-rich programmable logic with in-circuit reconfigurability. A Field Programmable Gate Array (FPGA) is a semiconductor IC built around an array of configurable logic blocks (CLBs), programmable routing channels, and programmable I/O cells. FPGAs sit at the top of the digital logic hierarchy: programmable logic device (PLD) -> complex PLD (CPLD) -> FPGA -> SoC FPGA. The FLEX 8000 family targets glue-logic, bus-interface, and state-machine consolidation roles where discrete 74-series logic or a CPLD would otherwise consume excessive board area. Key features include 84 Logic Array Blocks (LABs) with 8 logic elements per LAB, 4 dedicated input pins, MultiVolt I/O supporting 3.3V or 5.0V interface (144-pin packages), and configuration via industry-standard parallel EPROM or Altera serial configuration devices (EPC1, EPC1213, EPC1064, EPC1441). The -6 speed grade specifies a worst-case propagation delay of approximately 1.9ns. The FLEX 8000 architecture uses continuous SRAM configuration memory, allowing in-system reconfiguration (ICR) via a controller or configuration device. Each LAB contains an expansion product-term array and a carry chain for arithmetic functions; interconnect uses FastTrack routing with row and column channels. Die size and process technology make this device the lowest-density FLEX 8000 variant, suitable for designs that exceed CPLD capacity but do not require modern high-logic-count FPGAs. Typical applications include bus-interface bridging (PCI, ISA, VME), glue-logic consolidation in industrial controllers, state-machine replacement, address decoding and interrupt handling in embedded systems, and legacy 5V peripheral interfacing where MultiVolt I/O removes the need for level shifters. Production-intent designs targeting this part typically migrate to newer Cyclone or MAX families today. Design considerations include dedicated VCCINT and VCCIO rail separation for 3.3V/5.0V I/O, mandatory configuration device selection (EPC1, EPC2, EPC1441), and JTAG support via nCONFIG, nSTATUS, and CONF_DONE pins. The -6 speed grade represents one of the slower grades in the family; faster -3 or -2 grades are usable when timing margins are tight. This page synthesizes Altera FLEX 8000 specifications, parametric drop-in alternatives within the same speed/package family, and design notes not consolidated in the original datasheet.
EPF8820ATC144-7 - FLEX 8000 FPGA 672-Cell 7ns TQFP-144 | Altera
The Altera (now Intel) EPF8820ATC144-7 is a member of the classic FLEX 8000 programmable logic family, delivering 8,000 usable gates and 672 logic cells in a 144-pin TQFP package. The "-7" suffix denotes a 7ns pin-to-pin propagation delay speed grade, making it the slowest commercial bin of the EPF8820A device. According to Altera FLEX 8000 datasheet, the family is built on a 0.42 µm CMOS SRAM process and supports in-circuit reconfigurability (ICR) via external EPC1, EPC1064, EPC1213, or EPC1441 configuration EPROMs. A field-programmable gate array (FPGA) is a semiconductor IC containing an array of configurable logic blocks (CLBs), programmable routing channels, and programmable I/O cells. Designers describe logic at the register-transfer level using HDLs (VHDL or Verilog) and the synthesis toolchain maps the design into the bitstream that configures SRAM look-up tables, flip-flops, and interconnect. FPGAs sit in the broader programmable logic hierarchy: PLD (programmable logic device) is the umbrella term, SPLD/CPLD represent simpler non-volatile architectures, while SRAM-based FPGAs like FLEX 8000 offer the highest logic density and re-programmability. Key features of the EPF8820ATC144-7 include 84 Logic Array Blocks (LABs), 112 user I/O pins, a 5V core supply with MultiVolt I/O support (3.3V or 5.0V on the I/O bank for all packages except 84-pin variants), and JTAG-based boundary-scan testing per IEEE 1149.1. The architecture uses continuous FastTrack interconnect routing and incorporates embedded RAM blocks and a per-pin tri-state buffer for bus-oriented designs. The TQFP-144 footprint exposes 112 user I/Os while leaving the remaining pins for power, ground, configuration, and JTAG signals. Typical applications include glue-logic integration, peripheral bus bridging (ISA-to-PCI bridges in legacy PCs), industrial control state machines, prototyping ASICs, and replacement of multiple TTL/CMOS 74-series packages. Engineers also deploy the EPF8820ATC144-7 in telecommunications line cards, test equipment front-ends, and avionics subsystems where 5V tolerance and through-hole-compatible surface-mount packages are required. The FLEX 8000 family was a workhorse of late-1990s and early-2000s designs, and many systems still rely on these parts for long-life-cycle support. When designing with the EPF8820ATC144-7, ensure your Quartus II or MAX+PLUS II toolchain targets the FLEX 8000 device family and that the configuration EPROM (EPC1/EPC1064/EPC1441) is correctly selected for the device density. Watch the -7 speed grade carefully - it is the slowest EPF8820A bin and may not meet timing budgets that the -3 or -4 grades can. The part is now in NRND (Not Recommended for New Designs) lifecycle, so consider Cyclone or MAX families for new projects.