EPM7256SRI208-10 - 256-Macrocell MAX 7000S CPLD | Intel
N.º de pieza: EPM7256SRI208-10 ✗ Fin de vida| Cant. | Precio unitario | Total |
|---|---|---|
| 1 | $42.5 | $42,50 |
| 10 | $38.25 | $382,50 |
| 100 | $34 | $3.400,00 |
| 500 | $30.6 | $15.300,00 |
| 1.000 | $27.2 | $27.200,00 |
EPM7256SRI208-10 Descripción general
A CPLD (Complex Programmable Logic Device) is a programmable logic IC built from an array of macrocells and a programmable interconnect matrix, used to implement custom combinational and sequential logic without a full custom ASIC. In the logic hierarchy, a CPLD sits between simple programmable logic devices (SPLDs/PALs) and FPGAs: it offers lower density than an FPGA but deterministic, non-volatile, single-cycle timing. The MAX 7000S family is based on Altera's second-generation MAX architecture, fabricated in advanced CMOS with EEPROM configuration, so the device retains its configuration without an external boot PROM.
Key differentiators include 256 macrocells organized into 16 logic array blocks, 164 user I/O pins, in-system programmability (ISP) via JTAG, and a 10 ns pin-to-pin delay that supports counter frequencies up to 100 MHz. The EEPROM-based architecture provides instant-on operation and high design security compared with SRAM-based FPGAs.
The device operates from a 5 V supply (4.5 V to 5.5 V internal) and is specified for the industrial temperature range. Its 208-pin RQFP package provides the I/O count needed for wide bus interfaces, address decoding, and state-machine consolidation. Because the MAX 7000S family is mature, the EPM7256SRI208-10 is now obsolete and is typically sourced from independent distributors or replaced by pin-compatible MAX 7000S speed/grade variants.
Typical applications include telecom line-card glue logic, industrial control backplanes, legacy bus bridging (ISA/PCI), and instrumentation state machines. When designing with this device, verify the 5 V supply tolerance and JTAG chain integrity, and confirm availability because the part is discontinued. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet.
Alternativas directas para EPM7256SRI208-10 — mismo encapsulado, compatible pin a pin. Se excluyen las piezas de otro encapsulado que requieren retrabajo de la PCB.
Variantes de esta serie
Modelos de la misma serie compatibles directamente con EPM7256SRI208-10 (mismo factor de forma y huella) — difiere en Package, Usable Gates, Operating Temperature, RoHS Status, Macrocells.
Herramienta de comparación rápida — seleccione piezas alternativas para compararlas lado a lado:
EPM7256SRI208-10N
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
EPM7256SRC208-10
✅ Sustitución directa✓ En stock
$27.2 / unidad
Ver hoja de datos →EPM7256SRC208-10N
✅ Sustitución directa✓ En stock
$27.2 / unidad
Ver hoja de datos →EPM7256SQC208-10
✅ Sustitución directa✓ En stock
$11.2 / unidad
Ver hoja de datos →EPM7256SQC208-12
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
EPM7256SQC208-15
✅ Sustitución directa✓ En stock
$3.65 / unidad
Ver hoja de datos →EPM7256SRI208-10 Valores máximos y características eléctricas
| Logic Family | MAX 7000S (EEPROM-based CPLD) |
| Macrocells | 256 |
| Logic Array Blocks | 16 |
| Usable Gates | 5,000 |
| User I/O Pins | 164 |
| Pin-to-Pin Propagation Delay (tPD) | 10 ns |
| Maximum Internal Frequency | 100 MHz |
| Supply Voltage (Internal) | 4.5 V to 5.5 V |
| Logic Family Technology | CMOS |
| Programmable Type | In-System Programmable (ISP) via JTAG |
| Encapsulado | 208-pin RQFP (PowerQuad) |
| Tipo de montaje | Surface Mount |
| Rango de temperatura de funcionamiento | Industrial (-40C to +85C) |
| Configuration Memory | EEPROM (non-volatile) |
| JTAG Boundary Scan | Yes (BST circuitry) |
| Packaging | Tray |
Guía de configuración de pines de EPM7256SRI208-10 208-pin rqfp (powerquad)
Configuración de pines para EPM7256SRI208-10 (encapsulado 208-pin rqfp (powerquad)). Este CI digital incluye GPIO, interfaces de comunicación (UART, SPI, I2C) y pines de alimentación. Consulte la hoja de datos del fabricante para conocer las funciones alternativas de los pines y las opciones de configuración. Esencial para el diseño de sistemas embebidos y el diseño de PCB.
No hay datos detallados de patillaje disponibles para EPM7256SRI208-10.
Consulte la hoja de datos para ver la configuración completa de patillas.
Aplicaciones típicas
EPM7256SRI208-10 es adecuado para 6 aplicacións: Telecom Line-Card Glue Logic, Industrial Control Backplane Logic, Legacy Bus Bridging (ISA/PCI), Instrumentation State Machines, Industrial Automation I/O Expansion, Legacy Equipment Repair and Spares.
Telecom Line-Card Glue Logic
The EPM7256SRI208-10 fits telecom line-card glue logic because its 164 user I/O pins and 256 macrocells can absorb address decoding, bus arbitration, and control state machines that would otherwise require dozens of discrete 74-series devices. Its 10 ns pin-to-pin delay supports the timing margins of legacy 5 V telecom backplanes, and EEPROM configuration gives instant-on operation so the card boots deterministically without an external configuration PROM. Placed between the backplane interface and the line-interface ASIC, it consolidates glue logic and reduces board area. The trade-off is that the part is obsolete, so designers should qualify a pin-compatible MAX 7000S variant before committing to volume production.
Recomendado
Industrial Control Backplane Logic
In industrial control backplanes, the EPM7256SRI208-10 provides the wide I/O count (164 pins) and 256 macrocells needed to implement custom bus protocols, chip-select decoding, and interlock state machines. Its industrial temperature rating (-40C to +85C) and 5 V CMOS I/O make it compatible with legacy industrial logic levels, while the 10 ns propagation delay keeps deterministic timing for safety interlocks. The device is typically placed between the host controller and the field I/O interface, replacing a board full of discrete logic. Because it is EEPROM-based, it retains configuration through power cycles, which is important for equipment that must restart into a known state without a host-assisted boot sequence.
Recomendado
Legacy Bus Bridging (ISA/PCI)
The EPM7256SRI208-10 is well suited to legacy bus bridging between ISA, PCI, and proprietary backplanes because its 164 I/O pins can directly interface wide address and data buses, and its 256 macrocells implement the protocol translation state machines. A 10 ns pin-to-pin delay supports the timing of 5 V legacy buses, and the 5 V CMOS I/O avoids level-shifter overhead. The CPLD is placed between the legacy bus connector and the modern host bridge, translating control and handshake signals. The main design consideration is that the part is obsolete, so a pin-compatible MAX 7000S replacement should be qualified; the EEPROM architecture also means no configuration flash is required on the board.
Recomendado
Instrumentation State Machines
For instrumentation state machines, the EPM7256SRI208-10 offers deterministic single-cycle timing (10 ns pin-to-pin) that is essential for trigger sequencing, sample-clock generation, and measurement handshakes. Its 256 macrocells can implement multiple concurrent state machines, while 164 I/O pins interface front-panel controls, ADCs, and display drivers. The 5 V supply and CMOS I/O match legacy instrument rails, and EEPROM configuration ensures the instrument powers up in a defined state. The device is typically placed at the center of the digital control board, coordinating acquisition and display logic. Because the part is obsolete, designers should plan a migration path to a pin-compatible MAX 7000S variant or a modern CPLD.
Recomendado
Industrial Automation I/O Expansion
The EPM7256SRI208-10 can serve as an I/O expansion and protocol-conversion device in industrial automation, where its 164 user I/O pins aggregate sensor inputs, relay drivers, and fieldbus interfaces into a single programmable device. The 256 macrocells implement debounce logic, PWM generation, and handshake state machines, while the 10 ns propagation delay keeps response times deterministic. Its industrial temperature range supports factory-floor environments, and the 5 V CMOS I/O interfaces directly with legacy 24 V field logic through standard drivers. The CPLD sits between the field I/O and the host PLC, reducing wiring and board count. The key trade-off is obsolescence, so a pin-compatible replacement should be qualified for long-life automation platforms.
Recomendado
Legacy Equipment Repair and Spares
The EPM7256SRI208-10 is frequently required for repair and spares of legacy equipment, where a failed CPLD must be replaced without redesigning the board. Because the part is obsolete, sourcing is the primary challenge, and pin-compatible MAX 7000S variants such as the EPM7256SRI208-10N, EPM7256SRC208-10, and EPM7256SQC208-10 allow a drop-in repair when the original is unavailable. The 208-pin RQFP footprint and identical 256-macrocell logic ensure the replacement fits the existing land pattern, and the EEPROM configuration can be reprogrammed with the original JEDEC file via JTAG. The main consideration is verifying the speed grade and temperature rating match the original application before substitution.
Recomendado
Resumen de productos recomendados
Datos de referencia de ingeniería para EPM7256SRI208-10 — comparación, orientación de diseño e información de cumplimiento.
Guía de selección
Comparación con alternativas
| Parámetro | Este producto | EPM7256SRI208-10N | EPM7256SRC208-10 | EPM7256SQC208-10 | EPM7256SQC208-12 |
|---|---|---|---|---|---|
| Package | 208-pin RQFP | 208-pin RQFP - same | 208-pin RQFP - same | 208-pin RQFP - same | 208-pin RQFP - same |
| Brand | Intel (Altera) | Intel (Altera) | Intel (Altera) | Intel (Altera) | Intel (Altera) |
| Macrocells | 256 | 256 | 256 | 256 | 256 |
| User I/O Pins | 164 | 164 | 164 | 164 | 164 |
| Pin-to-Pin Delay (tPD) | 10 ns | 10 ns | 10 ns | 10 ns | 12 ns |
| Supply Voltage | 4.5 V to 5.5 V | 4.5 V to 5.5 V | 4.5 V to 5.5 V | 4.5 V to 5.5 V | 4.5 V to 5.5 V |
| Temperature Grade | Industrial (-40C to +85C) | Industrial (-40C to +85C) | Commercial (0C to +70C) | Commercial (0C to +70C) | Commercial (0C to +70C) |
| Lifecycle Status | Obsolete | Obsolete | Obsolete | Obsolete | Obsolete |
Diferenciadores clave
- Industrial temperature range with 10 ns speed grade (frente a EPM7256SRC208-10)
- Lead-free option available as a true drop-in (frente a EPM7256SRI208-10N)
- Faster than the -12 and -15 speed grades (frente a EPM7256SQC208-12)
Notas de diseño
The EPM7256SRI208-10 requires a 5 V supply within 4.5 V to 5.5 V. Decouple each VCC pin with a 0.1 uF ceramic capacitor placed as close to the pin as possible, plus a bulk 10 uF capacitor per power plane. Because the device is EEPROM-based, it draws programming current during ISP; ensure the supply can source the transient without dropping below 4.5 V, or the configuration may fail. Estimated: at 100 MHz with typical I/O loading, core current is on the order of tens of milliamps, but verify against the Altera MAX 7000 family datasheet power estimation tables for your specific design.
Route the 208-pin RQFP on a board with a solid ground plane and keep high-speed I/O traces short and matched. Place the JTAG header (TCK, TMS, TDI, TDO) close to the device and keep TCK traces away from noisy switching nodes to avoid programming failures. Because the part is obsolete, verify the land pattern against the Altera MAX 7000 family datasheet mechanical drawing before committing the PCB, as RQFP footprint dimensions must match exactly for a drop-in replacement.
The most common pitfall is assuming availability: the EPM7256SRI208-10 is obsolete, so a pin-compatible MAX 7000S variant (for example EPM7256SRI208-10N or EPM7256SRC208-10) should be qualified before production. Also confirm the speed grade and temperature range match the original application, since substituting a slower -12 or -15 grade reduces timing margin. Finally, always reprogram the replacement with the original JEDEC file via JTAG and verify the device signature before soldering, as counterfeit or mislabeled obsolete parts are common in the independent market.
Información de cumplimiento
RoHS/REACH status not stated in the provided web data for the EPM7256SRI208-10. The lead-free variant EPM7256SRI208-10N is identified by its 'N' suffix. AEC-Q100 is not applicable to this commercial/industrial CPLD.
