EPM7256AETC144-7N - MAX 7000A CPLD, 256 Macrocells, 7.5ns | Intel
MPN： EPM7256AETC144-7N ✗ 停產EPM7256AETC144-7N 概覽
A CPLD (Complex Programmable Logic Device) is a non-volatile, flash- or EEPROM-based programmable logic device that sits between simple SPLDs/PLDs and FPGAs in the programmable-logic hierarchy. It contains multiple PAL-like logic array blocks (LABs) interconnected by a central programmable switch matrix. CPLDs are deterministic, boot in microseconds without external configuration memory, and are widely used for glue logic, bus interfacing, address decoding, state-machine control, and I/O expansion where predictable timing and instant-on behavior matter more than the very high logic density of an FPGA.
Key features include 16 logic array blocks (LABs), 256 macrocells distributed as 16 macrocells per LAB, JTAG-based in-system programmability, multi-voltage I/O support via JTAG-driven I/O standards, open-drain output option, programmable slew rate, and a commercial operating temperature range of 0 °C to 70 °C. The MAX 7000A architecture uses EEPROM configuration cells, so the device retains its logic when power is removed and requires no external boot PROM.
The device is fabricated on an advanced CMOS EEPROM process. Each macrocell contains a programmable AND/OR array, a flip-flop with selectable Clear/Preset/Clock, and an I/O control block with selectable registered or combinatorial output. The 7.5 ns pin-to-pin delay (commercial grade) and 4.5 ns fast-option parts (MAX 7000AE) suit applications where deterministic, nanosecond-range timing replaces discrete 74-series glue logic and reduces board area and BOM count.
Typical applications include I/O expansion and glue logic for microcontrollers/MPUs, address decoding for memory-mapped buses, bus protocol bridging, peripheral control in industrial and telecom equipment, and state-machine-driven control logic in printers, routers, and test gear. The commercial 0 °C to 70 °C window suits indoor equipment; industrial designs requiring −40 °C to +85 °C should select the EPM7256AETI144-7N variant instead.
When designing with the EPM7256AETC144-7N, observe the 3.0 V to 3.6 V supply window carefully and reserve the four JTAG pins (TDI, TDO, TMS, TCK) plus a dedicated TRST/DEV_OE option. Inputs above 3.6 V will stress the EEPROM I/O cells; for 5 V-tolerant inputs consider the MAX 7000AE family or add external level shifters.
直接替換替代品，適用於 EPM7256AETC144-7N — 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： EPM7256AETC144-7N （相同外形與佔位） — 差異在於 Package, Operating Temperature, Programming Interface, Configuration Memory, Maximum Internal Frequency.
EPM7256AETI144-7N
✅ 直接替換聯絡詢價
查看資料表 →EPM7256AETC144-5N
✅ 直接替換聯絡詢價
查看資料表 →EPM7256AETC144-10N
✅ 直接替換聯絡詢價
查看資料表 →EPM7256AETC144-10
✅ 直接替換聯絡詢價
查看資料表 →EPM7256AETI144-7
✅ 直接替換 ⚠️ 規格未經驗證聯絡詢價
查看資料表 →EPM7256AETC144-7N 最大額定值與電氣特性
| Series | MAX 7000A |
| Programmable Type | In System Programmable (EEPROM) |
| Number of Macrocells | 256 |
| Number of Logic Elements / Blocks (LABs) | 16 |
| Number of Usable Gates | 5,000 |
| Number of I/O | 120 (max user I/O) |
| Propagation Delay tpd(1) Max | 7.5 ns |
| Maximum Counter Frequency | 126.6 MHz |
| Supply Voltage - Internal | 3.0 V to 3.6 V |
| 工作溫度 | 0 °C to 70 °C (Commercial) |
| 封裝 / 外殼 | 144-LQFP (TQFP-144, 20x20 mm) |
| 安裝類型 | Surface Mount |
| Programming Interface | IEEE 1149.1 JTAG (ISP) |
| Configuration Memory | EEPROM (non-volatile) |
| RoHS 狀態 | Compliant |
EPM7256AETC144-7N 144-lqfp (tqfp-144, 20x20 mm) 腳位配置指南
EPM7256AETC144-7N（144-lqfp (tqfp-144, 20x20 mm) 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： EPM7256AETC144-7N.
請參閱 資料表 以查看完整腳位配置。
典型應用
EPM7256AETC144-7N 適用於 6 應用s: Microcontroller / MPU I/O Expansion, Address Decoding and Chip-Select Generation, Industrial Control and Factory Automation, Legacy Bus Protocol Bridging, Telecom and Networking Line-Card Glue Logic, Test and Measurement Equipment.
Microcontroller / MPU I/O Expansion
The EPM7256AETC144-7N is well suited to expanding the limited I/O of a microcontroller or microprocessor. With 120 user I/Os available on the 144-pin TQFP package and 256 macrocells, it adds parallel ports, keypad matrices, segment-LCD drive lines and sensor interfaces without burdening the host CPU. The 7.5 ns pin-to-pin delay and 126.6 MHz counter frequency ensure deterministic timing for handshaking and interrupt generation. Power sequencing is straightforward because the MAX 7000A's EEPROM configuration boots in microseconds and needs no external boot PROM.
推薦
Address Decoding and Chip-Select Generation
The EPM7256AETC144-7N consolidates wide address decoders that previously required multiple 74LS138/139 PLD packages into one 144-pin TQFP CPLD. Designers can map large memory regions for SRAM, DRAM, Flash and peripherals with sub-10 ns latency, freeing board area and shortening the BOM. The 5,000 usable gates are sufficient to implement several independent decode trees in one device, and JTAG-driven in-system programming makes late-stage address-map changes cheap. The 3.3 V I/O is compatible with most modern ARM and MIPS host buses.
推薦
Industrial Control and Factory Automation
For glue logic on PLC backplanes, motor-driver front-ends and sensor-conditioning boards, the EPM7256AETC144-7N delivers deterministic state-machine control, PWM generation and protocol bridging in a single CPLD. Designers should select the EPM7256AETI144-7N pin-compatible variant when the application operates in the −40 °C to +85 °C industrial window. The MAX 7000A's open-drain output option and programmable slew rate simplify interfacing to 24 V industrial buses through external level shifters, and JTAG boundary-scan speeds up board test on the production line.
推薦
Legacy Bus Protocol Bridging
The EPM7256AETC144-7N bridges legacy parallel buses (ISA, PC/104, VME) to modern processors without glue-logic sprawl. With 256 macrocells and 120 user I/Os it can implement full 16- or 32-bit bus transceivers, wait-state generators, interrupt controllers and DMA handshakes on one device. The 7.5 ns tpd keeps bus-cycle latency low and the JTAG port lets field engineers re-flash the bridge logic for new peripherals. Designers migrating from discrete 74FCT/74ABT logic packages find that one TQFP-144 CPLD replaces 8-15 discrete packages.
推薦
Telecom and Networking Line-Card Glue Logic
Inside telecom line cards the EPM7256AETC144-7N handles time-slot switching, framer-to-DSP handshaking, alarm-collection and clock-distribution functions. Its 256 macrocells are well-matched to a multi-channel serial-agile interface, while the 126.6 MHz maximum counter frequency supports common 77.76 MHz and 155 MHz telecom clocks divided down. The non-volatile EEPROM boot avoids external configuration memory and gives instant-on behavior required by hot-swap line cards; the commercial temperature grade suits temperature-controlled central-office environments.
推薦
Test and Measurement Equipment
The EPM7256AETC144-7N is ideal for the digital-control backplane of oscilloscopes, logic analyzers and bench-top instruments where deterministic timing is mandatory. The 256 macrocells can implement trigger sequencers, channel-multiplexer control, display-timing generators and front-panel scan matrices in one device, while the JTAG TAP supports built-in self-test routines. The 7.5 ns tpd aligns with sub-100 MHz sample-rate handshakes, and the commercial temperature grade is comfortable for indoor lab environments; field-deployable units should select the EPM7256AETI144-7N industrial variant instead.
推薦
推薦產品摘要
工程參考資料，適用於 EPM7256AETC144-7N — 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 | EPM7256AETI144-7N | EPM7256AETC144-5N | EPM7256AETC144-10N | EPM7256AETC144-10 | EPM7256AETI144-7 |
|---|---|---|---|---|---|---|
| Brand | Intel | Intel | Intel | Intel | Intel | Intel |
| Package | TQFP-144 (20x20 mm) | TQFP-144 (20x20 mm) - same | TQFP-144 (20x20 mm) - same | TQFP-144 (20x20 mm) - same | TQFP-144 (20x20 mm) - same | TQFP-144 (20x20 mm) - same |
| Macrocells | 256 | 256 | 256 | 256 | 256 | 256 |
| Pin-to-Pin Delay tpd(1) | 7.5 ns | 7.5 ns | 5.0 ns | 10.0 ns | 10.0 ns | 7.5 ns |
| Operating Temperature | 0C to +70C (Commercial) | -40C to +85C (Industrial) | 0C to +70C (Commercial) | 0C to +70C (Commercial) | 0C to +70C (Commercial) | -40C to +85C (Industrial) |
| Supply Voltage | 3.0 V to 3.6 V | 3.0 V to 3.6 V | 3.0 V to 3.6 V | 3.0 V to 3.6 V | 3.0 V to 3.6 V | 3.0 V to 3.6 V |
| Usable Gates | 5,000 | 5,000 | 5,000 | 5,000 | 5,000 | 5,000 |
| Lifecycle Status | Obsolete | Obsolete | Obsolete | Obsolete | Obsolete | Obsolete |
主要差異化特點
- Mid-density MAX 7000A device with 256 macrocells and 120 I/Os in TQFP-144 (對比EPM7128AETC144-7N)
- Faster 7.5 ns speed grade compared with the 10 ns mainstream grade (對比EPM7256AETC144-10N)
- Drop-in industrial-temperature alternative available without PCB rework (對比EPM7256AETI144-7N)
設計說明
Estimated: with VCC = 3.3 V, all 120 I/O switching at 10 MHz, 15 pF load, ICC is approximately 60-90 mA (vendor datasheet typical). Place a 0.1 uF X7R ceramic decoupling capacitor within 3 mm of every VCC/GND pair on the TQFP-144 footprint and add a single 10 uF bulk capacitor on each side of the package. The MAX 7000A EEPROM draws a brief (<= 200 ms per datasheet) programming current during JTAG in-system programming, so reserve at least 150 mA of headroom in your 3.3 V rail budget to avoid droop during ISP.
Reserve the four JTAG pins (TDI, TDO, TMS, TCK) on a dedicated 4-pin 2.54 mm header or 1.27 mm Tag-Connect footprint so engineers can re-program or boundary-scan the part on the bench and in production. The DEV_CLRn and DEV_OE pins must each have a defined logic level (pull-up or pull-down) at power-up; leaving them floating can cause random macrocell reset or tri-state behavior during boot. Keep high-speed outputs (counter clocks, address strobes) short and route them on the top layer over a continuous ground plane to control crosstalk and EMI.
Do not apply inputs above 3.6 V to the EPM7256AETC144-7N; the MAX 7000A I/O cells are not 5 V-tolerant and an over-voltage input can permanently damage the EEPROM sense circuitry. For designs that need 5 V interfacing, either select a 5 V MAX 7000 (non-A) variant or add external resistor-divider / level-shifter networks. Also confirm that VCC ramps monotonically between 0 V and 3.3 V at power-up; a slow or bouncing supply rail can put the device into an indeterminate state and cause POR-related macrocell glitches on the first clock cycle.
合規資訊
RoHS compliance per Altera/Intel product page. Halogen-free status not explicitly disclosed in the datasheet excerpts; AEC-Q100 not applicable as this is a commercial-grade CPLD.
