EPM7256SRC208-7 - 256-Macrocell 5V CPLD | Altera | 208-Pin RQFP
부품 번호: EPM7256SRC208-7 ✗ 단종| 수량 | 단가 | 합계 |
|---|---|---|
| 1 | $0 | $0.00 |
| 10 | $0 | $0.00 |
| 100 | $0 | $0.00 |
| 500 | $0 | $0.00 |
| 1,000 | $0 | $0.00 |
EPM7256SRC208-7 개요
A CPLD (Complex Programmable Logic Device) is a programmable logic IC built from an array of macrocells connected by a programmable interconnect matrix. Unlike an FPGA, which uses fine-grained lookup tables and routing, a CPLD uses wide AND-OR macrocells that implement sum-of-products logic in a single pass, giving deterministic, non-volatile timing. In the product hierarchy, the EPM7256S sits under CPLD -> programmable logic device (PLD) -> digital logic IC -> semiconductor. The MAX 7000S family is EEPROM-based, so configuration is retained without an external boot device.
Key differentiators include 256 macrocells (the largest MAX 7000S density), 164 I/Os, 7.5 ns tPD, 128.2 MHz fMAX, and 5 V EEPROM non-volatile configuration. The -7 speed grade is the fastest standard grade in the family, and the 208-pin RQFP footprint is shared across the EPM7256S speed and temperature variants, allowing board reuse.
Architecturally, the device uses EEPROM-based programmable interconnect and macrocells with programmable output enable, global clocking, and fast input registers. The 5 V core and I/O simplify interfacing to legacy TTL/CMOS logic without level shifters, and the non-volatile array eliminates configuration PROMs and boot delays.
Typical applications include legacy bus bridging (ISA/PCI glue logic), industrial control backplanes, telecom line-card address decoding, and test equipment that must remain pin-compatible with existing 5 V designs. The 164 I/Os support wide parallel buses, and the 7.5 ns delay supports state machines up to roughly 100 MHz.
A key design consideration is that the MAX 7000S family is a mature, non-recommended-for-new-design product; new designs should evaluate MAX V or MAX 10, but existing 5 V boards can continue to use the EPM7256SRC208-7 as a drop-in. Verify the 208-pin RQFP land pattern and thermal pad before layout.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet, giving engineers a single reference for replacement and lifecycle decisions.
드롭인 대체품: EPM7256SRC208-7 — 동일 패키지, 핀 호환. PCB 재작업이 필요한 다른 패키지 부품은 제외됩니다.
이 시리즈의 변형
다음과 드롭인 호환되는 동일 시리즈 모델: EPM7256SRC208-7 (동일 폼 팩터 및 풋프린트) — 차이점: Package, Usable Gates, Device Type, Operating Temperature, Series.
빠른 비교 도구 — 나란히 비교할 대체 부품을 선택하십시오:
EPM7256SRC208-10
✅ 드롭인✓ 재고 있음
$27.2 / 개
데이터시트 보기 →EPM7256SRC208-15N
✅ 드롭인✓ 재고 있음
$27.2 / 개
데이터시트 보기 →EPM7256SRC208-7N
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
EPM7256SQC208-7
✅ 드롭인✓ 재고 있음
가격 문의
데이터시트 보기 →EPM7256SQC208-10
✅ 드롭인✓ 재고 있음
$11.2 / 개
데이터시트 보기 →EPM7256SQC208-15
✅ 드롭인✓ 재고 있음
$3.65 / 개
데이터시트 보기 →EPM7256SRC208-7 최대 정격 & 전기적 특성
| Family | MAX 7000S |
| Device Type | EEPROM-based Complex Programmable Logic Device (CPLD) |
| Macrocells | 256 |
| Usable Gates | 5,000 |
| User I/O Pins | 164 |
| Pin-to-Pin Propagation Delay (tPD) | 7.5 ns |
| Maximum Internal Frequency (fMAX) | 128.2 MHz |
| Supply Voltage (VCCINT/VCCIO) | 5 V |
| Configuration Memory | EEPROM (non-volatile) |
| 패키지 | 208-pin RQFP (PowerQuad Flat Pack) |
| Package Code | FQFP |
| Terminal Form | Gull Wing |
| Number of Terminals | 208 |
| 실장 유형 | Surface Mount |
| Operating Temperature Grade | Commercial (0C to +70C) |
| Speed Grade | -7 (fastest standard grade) |
| Packaging | Tray |
EPM7256SRC208-7 fqfp 핀 구성 가이드
EPM7256SRC208-7(fqfp 패키지)의 핀 구성입니다. 이 디지털 IC에는 GPIO, 통신 인터페이스(UART, SPI, I2C), 전원 핀이 포함되어 있습니다. 대체 핀 기능과 구성 옵션은 제조사 데이터시트를 참조하십시오. 임베디드 시스템 설계와 PCB 레이아웃에 필수적입니다.
다음에 대한 상세 핀아웃 데이터 없음: EPM7256SRC208-7.
다음을 참조하십시오: 데이터시트 전체 핀 구성은 다음을 참조하십시오.
일반적인 애플리케이션
EPM7256SRC208-7 적합 용도: 6 애플리케이션s: Legacy 5 V Bus Glue Logic, Industrial Control Backplane Logic, Telecom Line-Card Address Decoding, Test and Measurement Instrumentation, Legacy Equipment Spares and Repair, Industrial Automation I/O Expansion.
Legacy 5 V Bus Glue Logic
The EPM7256SRC208-7 fits legacy 5 V bus glue logic because its 5 V core and I/O interface directly to TTL/CMOS backplanes without level shifters, and its 164 I/Os can absorb wide address and data buses. With 7.5 ns pin-to-pin delay and 128.2 MHz fMAX, it implements address decoding, wait-state generation, and chip-select logic fast enough for ISA and early PCI timing. Designers replace dozens of 74-series gates with one 208-pin RQFP device, cutting board area and part count. The EEPROM array is non-volatile, so the logic is live at power-up with no configuration PROM. A trade-off is that the 5 V core dissipates more power than modern 1.8 V CPLDs, so provide adequate copper for thermal relief.
추천
Industrial Control Backplane Logic
In industrial control backplanes, the EPM7256SRC208-7 consolidates board-select, interrupt arbitration, and handshake logic into a single non-volatile CPLD. Its 256 macrocells and 164 I/Os handle multi-slot address decoding, while the 7.5 ns propagation delay keeps backplane cycle times short. Because the MAX 7000S array is EEPROM-based, the logic survives power cycling without a boot device, which is critical for factory equipment that must restart deterministically. The 5 V interface matches legacy industrial I/O racks directly. Designers should note the commercial temperature grade (0C to +70C); for wider ambient ranges, verify the specific grade or add thermal management. The 208-pin RQFP footprint is shared across speed grades, simplifying spares planning.
추천
Telecom Line-Card Address Decoding
The EPM7256SRC208-7 suits telecom line-card address decoding because its 164 I/Os can map wide backplane buses and its 128.2 MHz fMAX supports fast state machines. The device implements slot-ID comparison, chip-select fan-out, and interrupt aggregation in one 208-pin RQFP package, replacing discrete logic and reducing line-card footprint. Non-volatile EEPROM configuration means the card is functional immediately after power-up, avoiding the configuration latency of SRAM-based FPGAs. The 5 V I/O matches legacy telecom backplanes. A design consideration is that the MAX 7000S family is mature, so new line-card designs should evaluate MAX V while existing cards can continue using the EPM7256SRC208-7 as a drop-in. Confirm the RQFP land pattern and thermal pad before layout.
추천
Test and Measurement Instrumentation
The EPM7256SRC208-7 is used in test and measurement instrumentation for trigger logic, counter control, and front-panel interface glue. Its 7.5 ns pin-to-pin delay supports timing-critical trigger paths, and 256 macrocells implement multiple counters and state machines in one device. The 5 V I/O interfaces directly to legacy instrument buses, and the non-volatile EEPROM array ensures the instrument boots into a known logic state without configuration memory. The 208-pin RQFP package provides 164 I/Os for wide data paths. Designers should account for the commercial temperature grade and provide adequate decoupling on the 5 V rail. Because the family is mature, keep a qualified drop-in such as EPM7256SRC208-10 or EPM7256SRC208-7N in the approved-vendor list for long-life instruments.
추천
Legacy Equipment Spares and Repair
The EPM7256SRC208-7 is a common spare for legacy equipment repair because it is a socket-compatible MAX 7000S CPLD in the 208-pin RQFP package. Repair depots stock the -7, -10, and -15 speed grades and the lead-free -7N variant, all of which share the same 256-macrocell die and pinout, so a single board can be repaired with any available grade. The non-volatile EEPROM configuration means a replacement device retains its programmed logic without a configuration file, simplifying field replacement. A key consideration is authenticity: because the family is mature, source parts from franchised or traceable channels and verify date codes. Confirm the RQFP land pattern and exposed pad before rework.
추천
Industrial Automation I/O Expansion
The EPM7256SRC208-7 supports industrial automation I/O expansion by implementing parallel I/O expansion, debounce logic, and handshake state machines in a single non-volatile CPLD. Its 164 I/Os can drive multiple I/O modules, and 256 macrocells absorb the glue logic that would otherwise require several discrete devices. The 5 V interface matches legacy automation racks, and the EEPROM array keeps the logic live at power-up for deterministic machine startup. The 7.5 ns delay supports fast handshake cycles. Designers should note the commercial temperature grade and add thermal relief for the 5 V core. For new designs, evaluate MAX V or MAX 10; for existing racks, the EPM7256SRC208-7 remains a drop-in with same-family alternatives available.
추천
추천 제품 요약
엔지니어링 참조 데이터: EPM7256SRC208-7 — 비교, 설계 지침 및 규정 준수 정보.
선택 가이드
대체품과의 비교
| 파라미터 | 이 제품 | EPM7256SRC208-10 | EPM7256SRC208-15 | EPM7256SRC208-7N | EPM7256SQC208-7 |
|---|---|---|---|---|---|
| Package | 208-pin RQFP | 208-pin RQFP - same | 208-pin RQFP - same | 208-pin RQFP - same | 208-pin PQFP |
| Brand | Altera | Altera | Altera | Altera | Altera |
| Macrocells | 256 | 256 | 256 | 256 | 256 |
| User I/O Pins | 164 | 164 | 164 | 164 | 164 |
| Pin-to-Pin Delay (tPD) | 7.5 ns | 10 ns | 15 ns | 7.5 ns | 7.5 ns |
| Supply Voltage | 5 V | 5 V | 5 V | 5 V | 5 V |
| Configuration Memory | EEPROM (non-volatile) | EEPROM (non-volatile) | EEPROM (non-volatile) | EEPROM (non-volatile) | EEPROM (non-volatile) |
| Speed Grade | -7 | -10 | -15 | -7 | -7 |
주요 차별점
- Fastest standard MAX 7000S speed grade (vs EPM7256SRC208-10)
- Non-volatile EEPROM configuration (vs EPM7256SQC208-7)
- Lead-free drop-in available (vs EPM7256SRC208-7N)
설계 노트
Decouple every VCC pin of the EPM7256SRC208-7 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 5 V EEPROM-based MAX 7000S core draws transient current during macrocell switching; inadequate decoupling causes ground bounce and erratic logic. Estimated: at 128.2 MHz with 164 I/Os switching, supply transients can exceed 200 mV without local decoupling. Follow the MAX 7000 family recommended decoupling scheme.
The 208-pin RQFP uses a gull-wing lead frame with an exposed thermal pad. Solder the exposed pad to a matching copper land connected to ground with multiple vias to spread heat and provide a low-impedance return. Verify the land pattern against the MAX 7000 family package drawing before layout, and confirm pin 1 orientation. Estimated: the exposed pad improves thermal resistance by roughly 20-30% versus a non-pad RQFP, based on typical package behavior.
Do not assume the EPM7256SRC208-7 is pin-compatible with the PQFP EPM7256SQC208-7 without checking the land pattern: both are 208-pin but the RQFP and PQFP bodies differ. Also confirm the speed grade before substituting a -10 or -15 part, since slower grades reduce timing margin. Finally, the MAX 7000S family is mature; source from traceable channels and verify date codes to avoid counterfeit devices.
규정 준수 정보
Compliance data for EPM7256SRC208-7 was not present in the verified web data. The -7N variant is understood to be the lead-free (RoHS) version, but this was not confirmed by the retrieved sources. Verify compliance with the manufacturer or distributor before design release.