EPM7256AEQI208-7N - 256-Macrocell 3.3V CPLD | Altera
Teilenummer: EPM7256AEQI208-7N ✗ Abgekündigt| Menge | Stückpreis | Gesamt |
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| 1 | $0 | $0,00 |
| 10 | $0 | $0,00 |
| 100 | $0 | $0,00 |
| 500 | $0 | $0,00 |
| 1.000 | $0 | $0,00 |
EPM7256AEQI208-7N Übersicht
A CPLD (Complex Programmable Logic Device) is a programmable logic IC built from an array of macrocells and a programmable interconnect matrix. Unlike an FPGA, which uses SRAM configuration and volatile lookup tables, the MAX 7000A family is EEPROM-based, so the configuration is retained without an external boot device. In the logic hierarchy, a CPLD sits between discrete glue logic and full FPGAs: CPLD -> programmable logic device (PLD) -> digital logic IC -> semiconductor.
Key features of the EPM7256AEQI208-7N include 256 macrocells organized into 16 logic array blocks, 164 I/O pins, a maximum internal frequency of 126.6 MHz, and a 7.5 ns pin-to-pin delay. The 3.3 V core keeps dynamic power low while remaining 5 V tolerant on I/O, simplifying mixed-voltage board design. EEPROM configuration means the device is live within microseconds of power-up, which is critical for power sequencing and bus arbitration logic.
The MAX 7000A architecture uses product-term logic with programmable interconnect, giving deterministic, predictable timing - a key advantage over SRAM-based FPGAs for control-path logic. The 208-pin PQFP package provides ample I/O for bus bridging and glue-logic consolidation.
Typical applications include PCI/ISA bus interface logic, DSP and microcontroller glue logic, power-up sequencing controllers, and legacy industrial control boards. The industrial temperature rating supports factory automation and telecom line-card environments.
When designing with this device, note that it is a mature, non-volatile part; verify lifecycle status before committing to new production, and confirm the 7.5 ns speed grade meets your critical path. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet.
Drop-in-Alternativen für EPM7256AEQI208-7N – gleiches Gehäuse, Pin-kompatibel. Bauteile mit anderem Gehäuse, die eine PCB-Überarbeitung erfordern, sind ausgeschlossen.
Varianten dieser Serie
Modelle derselben Serie, die drop-in-kompatibel sind mit EPM7256AEQI208-7N (gleiche Bauform und Footprint) – abweichend in Package, Operating Temperature, RoHS Status, Mounting Type, Maximum Internal Frequency.
Schnellvergleichstool – Wählen Sie Alternativbauteile für den Direktvergleich:
EPM7256AEQI208-7
✅ Drop-In📋 Referenzalternative (nicht im Katalog)
EPM7256AEQC208-5N
✅ Drop-In✓ Auf Lager
$11.5 / Stück
Datenblatt ansehen →EPM7256AEFI256-7
✅ Drop-In✓ Auf Lager
$18.75 / Stück
Datenblatt ansehen →EPM7256AEFC256-5N
✅ Drop-In✓ Auf Lager
$23.1 / Stück
Datenblatt ansehen →EPM7256AEFC100-7
✅ Drop-In✓ Auf Lager
$15.2 / Stück
Datenblatt ansehen →EPM7256AEFI100-7
✅ Drop-In✓ Auf Lager
$65.4 / Stück
Datenblatt ansehen →EPM7256AEQI208-7N Grenzwerte & elektrische Eigenschaften
| Family | MAX 7000A |
| Macrocells | 256 |
| Usable Gates | 5,000 |
| User I/O Pins | 164 |
| Logic Array Blocks | 16 |
| Pin-to-Pin Propagation Delay (tPD) | 7.5 ns |
| Maximum Internal Frequency | 126.6 MHz |
| Versorgungsspannung | 3.3 V |
| Configuration Technology | EEPROM (non-volatile) |
| Gehäuse | 208-pin PQFP (FQFP) |
| Number of Terminals | 208 |
| Terminal Form | Gull Wing |
| Package Shape | Square |
| Montageart | Surface Mount |
| Operating Temperature Grade | Industrial |
| Speed Grade | -7 |
| RoHS-Status | Compliant (N suffix) |
EPM7256AEQI208-7N square Pinbelegungsleitfaden
Pinbelegung für EPM7256AEQI208-7N (square-Gehäuse). Dieser digitale IC umfasst GPIO, Kommunikationsschnittstellen (UART, SPI, I2C) und Versorgungspins. Alternative Pin-Funktionen und Konfigurationsoptionen entnehmen Sie dem Herstellerdatenblatt. Unverzichtbar für Embedded-System-Design und PCB-Layout.
Keine detaillierten Pinbelegungsdaten verfügbar für EPM7256AEQI208-7N.
Siehe die Datenblatt für die vollständige Pin-Konfiguration.
Typische Anwendungen
EPM7256AEQI208-7N ist geeignet für 6 Anwendungs: PCI/ISA Bus Interface Logic, Power-Up Sequencing Controller, DSP and Microcontroller Glue Logic, Industrial Control and Automation, Telecom Line Card Logic, Legacy System Replacement and Repair.
PCI/ISA Bus Interface Logic
The EPM7256AEQI208-7N fits PCI and ISA bus interface logic because its 164 user I/O pins and 256 macrocells can absorb the address decoding, wait-state generation, and bus arbitration that would otherwise require dozens of discrete 74-series devices. Its 7.5 ns pin-to-pin delay keeps bus timing within the PCI 33 MHz setup/hold window, and the 3.3 V core with 5 V-tolerant I/O simplifies mixed-voltage backplane design. The EEPROM configuration means the interface logic is active within microseconds of power-up, before the host can issue configuration cycles. A typical implementation places the CPLD between the host bus and a peripheral controller, with the 208-pin PQFP soldered directly to the motherboard. The trade-off versus a modern FPGA is lower logic density, but deterministic timing and no boot device make it attractive for legacy line cards.
Empfohlen
Power-Up Sequencing Controller
The EPM7256AEQI208-7N is well suited to power-up sequencing because its EEPROM configuration is non-volatile and available immediately at power-on, unlike SRAM-based FPGAs that need a configuration PROM. With 256 macrocells it can implement multi-rail enable sequencing, reset stretching, and fault latching for boards with several voltage domains. The 3.3 V supply matches modern rail voltages, and the industrial temperature rating covers factory-floor environments. In a typical design the CPLD drives enable pins on DC-DC converters and monitors power-good signals, holding downstream devices in reset until all rails are valid. The 7.5 ns propagation delay ensures sequencing edges are crisp and deterministic. The main trade-off is that the CPLD itself must be powered from an always-on rail, so include a small LDO for its 3.3 V supply.
Empfohlen
DSP and Microcontroller Glue Logic
The EPM7256AEQI208-7N consolidates glue logic around DSPs and microcontrollers, replacing address decoders, chip-select generators, and handshake state machines. Its 256 macrocells and 164 I/O pins can bridge a 16-bit or 32-bit processor bus to multiple peripherals while implementing wait-state logic in the same device. The 126.6 MHz maximum internal frequency comfortably covers typical DSP interface clocks, and the 7.5 ns pin-to-pin delay keeps combinatorial paths short. Because the MAX 7000A architecture uses product-term logic with a programmable interconnect, timing is deterministic and easy to constrain, unlike SRAM FPGA routing. A common implementation places the CPLD between the DSP external memory interface and flash/SRAM, generating chip selects and refresh logic. The trade-off is fixed logic capacity, so budget macrocells carefully.
Empfohlen
Industrial Control and Automation
The EPM7256AEQI208-7N suits industrial control boards because its industrial temperature grade and EEPROM non-volatile configuration tolerate factory-floor conditions and instant-on requirements. It can implement PLC scan logic, encoder interfaces, and safety interlock state machines with deterministic 7.5 ns timing. The 164 I/O pins allow direct connection to opto-isolators, relay drivers, and sensor front ends without external multiplexing. The 3.3 V core keeps power dissipation low in sealed enclosures, and the 208-pin PQFP is robust for through-hole-adjacent assembly. In a typical design the CPLD sits between a host microcontroller and the field I/O, handling debounce, edge detection, and fault latching. The trade-off versus a modern FPGA is lower density, but for fixed control logic the deterministic timing and no-boot-device simplicity are decisive advantages.
Empfohlen
Telecom Line Card Logic
The EPM7256AEQI208-7N fits telecom line cards where deterministic timing and non-volatile configuration are essential for always-on operation. Its 256 macrocells can implement TDM timeslot assignment, framer interface logic, and alarm monitoring, while the 164 I/O pins connect to backplane connectors and line interface units. The 126.6 MHz internal frequency supports E1/T1 and SONET overhead processing, and the 7.5 ns pin-to-pin delay keeps backplane timing margins comfortable. EEPROM configuration means the card is functional immediately after hot-swap insertion, without waiting for a configuration download. A typical implementation places the CPLD between the backplane and the framer, handling clock domain crossing and status aggregation. The trade-off is that the MAX 7000A family is legacy, so new designs should evaluate migration to MAX II or MAX V.
Empfohlen
Legacy System Replacement and Repair
The EPM7256AEQI208-7N is frequently used to repair and sustain legacy systems where the original MAX 7000A CPLD is no longer stocked. Its 208-pin PQFP footprint matches existing boards, and the EEPROM configuration can be reprogrammed from the original JEDEC file, so no board redesign is needed. The 256 macrocells and 164 I/O pins match the original device, and the 7.5 ns speed grade preserves existing timing margins. For repair depots, the key advantage is that the part is a true drop-in for the EPM7256AEQI208-7 and other MAX 7000A variants in the same package. The trade-off is limited and fluctuating stock, so buyers should qualify multiple sources and consider the faster EPM7256AEQC208-5N as a fallback where the industrial temperature rating is not mandatory.
Empfohlen
Zusammenfassung der empfohlenen Produkte
Technische Referenzdaten für EPM7256AEQI208-7N – Vergleich, Designhinweise und Compliance-Informationen.
Auswahlhilfe
Vergleich mit Alternativen
| Parameter | Dieses Produkt | EPM7256AEQI208-7 | EPM7256AEQC208-5N | EPM7256AEFI256-7 | EPM7256AEFC100-7 |
|---|---|---|---|---|---|
| Package | 208-pin PQFP (FQFP) | 208-pin PQFP (FQFP) - same | 208-pin PQFP (FQFP) - same | 256-pin FineLine BGA | 100-pin PQFP |
| Brand | Altera | Altera | Altera | Altera | Altera |
| Macrocells | 256 | 256 | 256 | 256 | 256 |
| Pin-to-Pin Delay (tPD) | 7.5 ns | 7.5 ns | 5 ns | 7.5 ns | 7.5 ns |
| Supply Voltage | 3.3 V | 3.3 V | 3.3 V | 3.3 V | 3.3 V |
| Temperature Grade | Industrial | Industrial | Commercial | Industrial | Commercial |
| RoHS Compliant | Yes (N suffix) | No | Yes | No | No |
| Configuration Technology | EEPROM (non-volatile) | EEPROM (non-volatile) | EEPROM (non-volatile) | EEPROM (non-volatile) | EEPROM (non-volatile) |
Wichtigste Unterscheidungsmerkmale
- RoHS-compliant lead-free construction (vs. EPM7256AEQI208-7)
- Industrial temperature rating (vs. EPM7256AEQC208-5N)
- 208-pin PQFP footprint with 164 user I/O (vs. EPM7256AEFC100-7)
- Non-volatile EEPROM configuration (vs. SRAM-based FPGAs)
Designhinweise
Decouple every VCC pin of the EPM7256AEQI208-7N with a 0.1 uF ceramic capacitor placed within 5 mm of the pin, plus at least one 10 uF bulk capacitor per power plane. The MAX 7000A core draws transient current during macrocell switching, and the 208-pin PQFP has many VCC/GND pairs; missing decoupling on any pair can cause configuration or timing failures. Estimated: at 126.6 MHz with 50% macrocell utilization, core current is on the order of tens of milliamps, so a 3.3 V rail rated for at least 200 mA provides margin.
The 208-pin PQFP uses a 0.5 mm lead pitch, so use a solder mask defined pad geometry and a stencil aperture of 0.25 mm or less to avoid bridging. Route all 164 user I/O traces with controlled impedance if they carry high-speed signals, and keep the EEPROM configuration pins accessible on a test header for in-system reprogramming. Provide a solid ground plane under the device to control return paths.
Do not assume the EPM7256AEQI208-7N is pin-compatible with the 256-pin FineLine BGA variants (EPM7256AEFI256-7, EPM7256AEFC256-5N) - the package and land pattern differ completely. Also verify the speed grade: the -7 suffix means 7.5 ns tPD, and substituting a -10 or -15 part will violate timing. Finally, confirm the 'N' suffix for RoHS compliance if your assembly process requires lead-free soldering.
The EPM7256AEQI208-7N in the 208-pin PQFP has no exposed thermal pad, so heat is removed through the package body and leads. Estimated: at 3.3 V and typical core current of tens of milliamps, power dissipation is well under 1 W, so no heatsink is required in still air below 70 C ambient. Forced airflow is recommended if the board is densely populated or ambient exceeds 85 C.
Compliance-Informationen
The 'N' suffix on EPM7256AEQI208-7N indicates RoHS-compliant lead-free construction per distributor listings. REACH, halogen-free, and conflict-minerals status were not stated in the verified web data and are marked unknown.
