EPM7256SRC208-10 - MAX 7000S CPLD 256 Macrocell 10ns | Intel
부품 번호: EPM7256SRC208-10 ✗ 단종| 수량 | 단가 | 합계 |
|---|---|---|
| 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 |
EPM7256SRC208-10 개요
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 distributes logic in fine-grained lookup tables and routing fabric, a CPLD concentrates wide AND/OR product terms in each macrocell, giving deterministic, non-volatile, single-cycle timing. In the logic hierarchy, a CPLD sits between discrete glue logic and FPGAs: CPLD -> programmable logic device (PLD) -> digital logic IC -> semiconductor. The MAX 7000S family uses EEPROM configuration cells, so the design is retained without an external configuration PROM.
Key features include 256 macrocells organized into 16 logic array blocks (LABs), 164 user I/O pins, a 10 ns tPD (speed grade -10), and 100 MHz maximum operating frequency. The device supports in-system programmability (ISP) through the JTAG port, allowing field upgrades without removing the part from the board. The 208-pin RQFP package with exposed pad provides a compact 28x28 mm footprint for designs that would otherwise require dozens of 74-series glue-logic packages.
The MAX 7000S architecture uses a programmable interconnect array (PIA) to route signals between LABs, with each macrocell containing a flip-flop and programmable product-term logic. This architecture delivers predictable, fixed propagation delays independent of routing, which is critical for bus-interface and state-machine designs where timing closure must be guaranteed. The EEPROM process also provides excellent retention and immunity to single-event upsets compared with SRAM-based FPGAs.
Typical applications include PCI/ISA bus bridging, address decoding and chip-select generation, glue-logic consolidation in industrial controllers, legacy system maintenance, and prototyping of state machines. The 5 V supply and 5 V-tolerant I/O make it a natural fit for interfacing modern 3.3 V logic to legacy 5 V peripherals.
When designing with this device, note that the part is obsolete and should be designed out for new projects; for existing designs, ensure the JTAG chain is accessible for ISP and provide adequate decoupling on each VCC pin. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet.
드롭인 대체품: EPM7256SRC208-10 — 동일 패키지, 핀 호환. PCB 재작업이 필요한 다른 패키지 부품은 제외됩니다.
이 시리즈의 변형
다음과 드롭인 호환되는 동일 시리즈 모델: EPM7256SRC208-10 (동일 폼 팩터 및 풋프린트) — 차이점: Package, RoHS Status, Operating Temperature Range, Speed Grade, Operating Temperature.
빠른 비교 도구 — 나란히 비교할 대체 부품을 선택하십시오:
EPM7256SQC208-10
✅ 드롭인✓ 재고 있음
$11.2 / 개
데이터시트 보기 →EPM7256SQC208-7
✅ 드롭인✓ 재고 있음
가격 문의
데이터시트 보기 →EPM7256SQC208-15
✅ 드롭인✓ 재고 있음
$3.65 / 개
데이터시트 보기 →EPM7256SQC208-15N
✅ 드롭인✓ 재고 있음
가격 문의
데이터시트 보기 →EPM7256SQC208-7N
✅ 드롭인✓ 재고 있음
$27.2 / 개
데이터시트 보기 →EPM7256SQI208-10
✅ 드롭인✓ 재고 있음
$0.4 / 개
데이터시트 보기 →EPM7256SRC208-10 최대 정격 & 전기적 특성
| Family | MAX 7000S |
| Device Type | CPLD (Complex Programmable Logic Device) |
| Number of Macrocells | 256 |
| Number of Logic Array Blocks (LABs) | 16 |
| Number of Gates | 5000 |
| Number of User I/O Pins | 164 |
| Maximum Propagation Delay (tPD) | 10 ns |
| Maximum Operating Frequency | 100 MHz |
| Supply Voltage (Internal) | 4.75 V to 5.25 V |
| Programmable Type | In System Programmable (ISP, JTAG) |
| Configuration Technology | EEPROM |
| 패키지 | 208-pin RQFP (BFQFP) exposed pad, 28x28 mm |
| 실장 유형 | Surface Mount |
| 동작 온도 | 0C to +70C (TA, commercial) |
| Terminal Form | Gull Wing |
| Package Shape | Square |
| Product Status | Obsolete |
EPM7256SRC208-10 핀 구성
| 핀 1 | I/O — User I/O pin (per datasheet) |
| 핀 2 | I/O — User I/O pin (per datasheet) |
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| 핀 53 | GND — Ground (per datasheet) |
| 핀 54 | VCC — 5 V supply (per datasheet) |
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| 핀 105 | GND — Ground (per datasheet) |
| 핀 106 | VCC — 5 V supply (per datasheet) |
| 핀 107 | I/O — User I/O pin (per datasheet) |
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| 핀 156 | I/O — User I/O pin (per datasheet) |
| 핀 157 | GND — Ground (per datasheet) |
| 핀 158 | VCC — 5 V supply (per datasheet) |
| 핀 159 | I/O — User I/O pin (per datasheet) |
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일반적인 애플리케이션
EPM7256SRC208-10 적합 용도: 6 애플리케이션s: PCI/ISA Bus Bridging, Industrial Control Glue Logic, Legacy System Maintenance and Repair, Address Decoding and Chip-Select Logic, State Machine Implementation, Prototyping and Educational Logic Design.
PCI/ISA Bus Bridging
The EPM7256SRC208-10 fits PCI and ISA bus-bridge designs because its 164 user I/O pins and 256 macrocells can absorb the address, data, and control glue logic that would otherwise require dozens of discrete 74-series packages. Its 10 ns pin-to-pin delay supports bus cycles in the tens-of-megahertz range, and the EEPROM configuration retains the bridge logic without an external configuration PROM. Placed between the host bus and a peripheral controller, the CPLD performs address decoding, wait-state generation, and interrupt steering. The trade-off is that the 5 V supply and 208-pin RQFP footprint are large by modern standards, and the device is obsolete, so this application is limited to legacy board maintenance rather than new designs.
추천
Industrial Control Glue Logic
In industrial controllers, the EPM7256SRC208-10 consolidates chip-select generation, address decoding, and handshake logic for multiple peripherals into one 256-macrocell device. Its 5,000 gates and 164 I/O pins allow a single CPLD to replace a board full of 74HC logic, reducing component count and improving reliability. The 4.75-5.25 V supply matches legacy 5 V sensors and actuators, and the 10 ns tPD gives deterministic timing for state machines. The EEPROM configuration survives power cycles without a battery or configuration flash. The main consideration is thermal: the 208-pin RQFP exposed pad must be soldered to a copper area to dissipate the CPLD's switching power, and the obsolete status means spare parts must be sourced from remaining stock.
추천
Legacy System Maintenance and Repair
The EPM7256SRC208-10 is widely used to keep legacy telecom, industrial, and test equipment running after the original manufacturer has discontinued support. Because the device is in-system programmable via JTAG, a failed CPLD can be replaced and reprogrammed in the field using the original JEDEC programming file, restoring the board without a full redesign. The 208-pin RQFP exposed-pad package matches the original footprint, so repair is a true drop-in operation. The key risk is counterfeit or re-marked parts from the secondary market, so buyers should source from authorized distributors and verify date codes. Where the exact part cannot be found, EPM7256SQC208-10 provides functional equivalence at the cost of a package change.
추천
Address Decoding and Chip-Select Logic
The EPM7256SRC208-10 excels at address decoding and chip-select generation because its macrocell architecture implements wide AND/OR product terms in a single 10 ns delay stage. A 256-macrocell device can decode dozens of memory-mapped peripherals simultaneously, each with its own chip-select and wait-state logic, replacing a cascade of 74-series decoders that would add propagation delay and board area. The 164 I/O pins allow direct connection to address, data, and control buses without external buffers. Designers should register critical chip-select outputs in the macrocell flip-flops to eliminate decode glitches, and should distribute VCC decoupling across all supply pins to control ground bounce during simultaneous output switching.
추천
State Machine Implementation
The EPM7256SRC208-10 implements complex finite-state machines with up to 256 registered macrocells, each containing a flip-flop and programmable product-term logic. Because the MAX 7000S interconnect array delivers fixed, predictable delays, state-machine timing is deterministic and does not depend on routing, unlike SRAM-based FPGAs. This makes the device suitable for protocol engines, sequencers, and control FSMs running at up to 100 MHz. The EEPROM configuration means the state machine is live immediately at power-up, with no configuration load time. Designers should register all state outputs and use the global clock and clear networks to minimize skew, and should keep the number of product terms per transition within the macrocell limit to avoid cascaded expansion delays.
추천
Prototyping and Educational Logic Design
The EPM7256SRC208-10 is a useful platform for teaching programmable-logic design because its 256 macrocells and 164 I/O pins are large enough for realistic projects while the MAX 7000S architecture remains simple enough to understand at the product-term level. Students can implement counters, decoders, and state machines in Quartus or MAX+PLUS II and program the device in-system over JTAG, observing results immediately. The 5 V supply and 5 V-tolerant I/O interface directly with breadboard logic and legacy test equipment. The main drawback is that the device is obsolete and the 208-pin RQFP package requires a fine-pitch soldering or socket solution, so educational programs should consider migrating to an active MAX II or MAX V device.
추천
추천 제품 요약
엔지니어링 참조 데이터: EPM7256SRC208-10 — 비교, 설계 지침 및 규정 준수 정보.
선택 가이드
대체품과의 비교
| 파라미터 | 이 제품 | EPM7256SQC208-10 | EPM7256SQC208-7 | EPM7256SQC208-15 | EPM7256SQI208-10 |
|---|---|---|---|---|---|
| Package | 208-pin RQFP (BFQFP) exposed pad | 208-pin PQFP | 208-pin PQFP | 208-pin PQFP | 208-pin PQFP |
| Brand | Intel | Intel | Intel | Intel | Intel |
| Number of Macrocells | 256 | 256 | 256 | 256 | 256 |
| Number of User I/O | 164 | 164 | 164 | 164 | 164 |
| Maximum Propagation Delay (tPD) | 10 ns | 10 ns | 7.5 ns | 15 ns | 10 ns |
| Supply Voltage | 4.75 V to 5.25 V | 4.75 V to 5.25 V | 4.75 V to 5.25 V | 4.75 V to 5.25 V | 4.75 V to 5.25 V |
| Operating Temperature | 0C to +70C (commercial) | 0C to +70C (commercial) | 0C to +70C (commercial) | 0C to +70C (commercial) | -40C to +85C (industrial) |
| Programmable Type | In System Programmable (JTAG) | In System Programmable (JTAG) | In System Programmable (JTAG) | In System Programmable (JTAG) | In System Programmable (JTAG) |
| Number of Gates | 5000 | 5000 | 5000 | 5000 | 5000 |
| Product Status | Obsolete | Obsolete | Obsolete | Obsolete | Obsolete |
주요 차별점
- RQFP exposed-pad footprint (vs EPM7256SQC208-10)
- 10 ns speed grade balance (vs EPM7256SQC208-7)
- Commercial temperature grade (vs EPM7256SQI208-10)
설계 노트
Decouple every VCC pin of the EPM7256SRC208-10 with a 0.1 uF ceramic capacitor placed as close to the pin as possible, plus at least one 10 uF bulk capacitor per supply rail. The MAX 7000S family switches many outputs simultaneously, and inadequate decoupling causes ground bounce and false clocking. Estimated: with 164 I/O switching at 5 V into 50 pF loads at 50 MHz, transient supply current can exceed several hundred milliamps, so low-ESL ceramic capacitors and a solid ground plane are essential.
The 208-pin RQFP package has an exposed thermal pad that must be soldered to a copper area on the PCB. Estimated: at 5 V and 100 MHz with typical toggle rates, the device can dissipate 1-2 W; without a thermal pad connection the junction temperature may exceed the 0C to +70C commercial rating. Use a thermal via array under the pad and connect it to the ground plane. Confirm the actual power estimate with Intel's power calculator for the MAX 7000S family.
Route the JTAG signals (TCK, TMS, TDI, TDO) as short, controlled-impedance traces and keep them away from high-speed I/O to avoid corrupting in-system programming. Provide a 10-pin JTAG header with proper VCC and GND references. Because the EPM7256SRC208-10 is obsolete, also design a test point or header for the configuration file so that a replacement device can be reprogrammed in the field without desoldering.
Do not assume EPM7256SQC208-10 is a footprint drop-in for EPM7256SRC208-10. The SRC suffix denotes the 208-pin RQFP exposed-pad package while SQC denotes the 208-pin PQFP; the land patterns differ. Verify the package drawing before substituting. Also confirm the speed grade: a -15 part has 15 ns tPD versus 10 ns for the -10, which can break timing in existing designs.
규정 준수 정보
Compliance data was not present in the verified web data for EPM7256SRC208-10. The lead-free (N) suffix variants such as EPM7256SQC208-7N and EPM7256SQC208-15N indicate lead-free construction, but the base part's RoHS/REACH status must be confirmed with the manufacturer or distributor.
