EPM7256SRI208-10 - 256-Macrocell MAX 7000S CPLD | Intel
MPN： EPM7256SRI208-10 ✗ 停產EPM7256SRI208-10 概覽
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.
直接替換替代品，適用於 EPM7256SRI208-10 — 相同封裝，腳位對腳位相容。需重新設計 PCB 的不同封裝零件不列入。
此系列的變體
與下列產品可直接替換的同系列型號： EPM7256SRI208-10 （相同外形與佔位） — 差異在於 Package, Usable Gates, Operating Temperature, RoHS Status, Macrocells.
EPM7256SRI208-10N
✅ 直接替換📋 參考替代品（不在目錄中）
EPM7256SRC208-10
✅ 直接替換聯絡詢價
查看資料表 →EPM7256SRC208-10N
✅ 直接替換聯絡詢價
查看資料表 →EPM7256SQC208-10
✅ 直接替換聯絡詢價
查看資料表 →EPM7256SQC208-12
✅ 直接替換📋 參考替代品（不在目錄中）
EPM7256SQC208-15
✅ 直接替換聯絡詢價
查看資料表 →EPM7256SRI208-10 最大額定值與電氣特性
| 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 |
| 封裝 | 208-pin RQFP (PowerQuad) |
| 安裝類型 | Surface Mount |
| 工作溫度範圍 | Industrial (-40C to +85C) |
| Configuration Memory | EEPROM (non-volatile) |
| JTAG Boundary Scan | Yes (BST circuitry) |
| Packaging | Tray |
EPM7256SRI208-10 208-pin rqfp (powerquad) 腳位配置指南
EPM7256SRI208-10（208-pin rqfp (powerquad) 封裝）的腳位配置。 此數位 IC 包含 GPIO、通訊介面（UART、SPI、I2C）與電源腳位。替代腳位功能與配置選項請參閱製造商資料表。對嵌入式系統設計與 PCB 佈局至關重要。
無詳細腳位定義資料： EPM7256SRI208-10.
請參閱 資料表 以查看完整腳位配置。
典型應用
EPM7256SRI208-10 適用於 6 應用s: 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.
推薦
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.
推薦
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.
推薦
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.
推薦
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.
推薦
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.
推薦
推薦產品摘要
工程參考資料，適用於 EPM7256SRI208-10 — 比較、設計指引及合規資訊。
選型指南
與替代品比較
| 參數 | 本產品 | 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 |
主要差異化特點
- Industrial temperature range with 10 ns speed grade (對比EPM7256SRC208-10)
- Lead-free option available as a true drop-in (對比EPM7256SRI208-10N)
- Faster than the -12 and -15 speed grades (對比EPM7256SQC208-12)
設計說明
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.
合規資訊
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.
