EPM7256SQC208-15 - 256-Macrocell MAX 7000S CPLD, 15ns | Altera
MPN： EPM7256SQC208-15 ✗ 停產EPM7256SQC208-15 概覽
A CPLD (Complex Programmable Logic Device) is a non-volatile programmable logic device that combines multiple PAL-like macrocell blocks with a programmable interconnect matrix. Architecturally, CPLDs sit between simple SPLDs/PALs and larger FPGAs in the programmable logic hierarchy: like SPLDs they offer instant-on, deterministic, flash- or EPROM-backed configuration, but like FPGAs they integrate hundreds to thousands of gates with predictable timing. The MAX 7000S family uses Altera's second-generation MAX architecture with EEPROM-based configuration cells, eliminating the need for an external boot PROM and enabling in-system programmability (ISP) via JTAG.
Key features of the EPM7256SQC208-15 include 256 macrocells distributed across 16 LABs, a global clock network, programmable power management with pin-controlled turbo-bit disable for low-power standby, JTAG-compliant boundary-scan (IEEE 1149.1), and four pin-compatible speed grades (7, 10, 12, 15 ns). The 'C' in the part number designates the commercial 0C to +70C operating range; '15' denotes the 15 ns pin-to-pin delay.
Typical applications include bus-bridging logic between microprocessors and peripherals, address decoding and chip-select generation in embedded systems, glue logic in telecommunications and networking equipment, industrial control state machines, and replacement of multiple discrete 74-series logic ICs. The 164 user I/Os comfortably support wide data and address buses plus control signals for legacy parallel interfaces.
When designing with the EPM7256SQC208-15, ensure 5V tolerance compatibility for the I/O banks, provide proper decoupling on VCCINT/VCCIO pins, and use the Altera MAX+PLUS II or Quartus II design tools for synthesis, fitting, and JTAG programming. Designers migrating to lower-density footprints should consider the speed-grade variants (EPM7256SQC208-10 for 10 ns, EPM7256SQC208-7 for 7 ns) which are pin-compatible drop-in upgrades.
直接替換替代品，適用於 EPM7256SQC208-15 — 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： EPM7256SQC208-15 （相同外形與佔位） — 差異在於 Package, Speed Grade, Operating Temperature Range, RoHS Status, Device Type.
EPM7256SQC208-10
✅ 直接替換聯絡詢價
查看資料表 →EPM7256SQC208-7
✅ 直接替換聯絡詢價
查看資料表 →EPM7256BQC208-7
✅ 直接替換聯絡詢價
查看資料表 →EPM7256AQC208-7
✅ 直接替換聯絡詢價
查看資料表 →EPM7256SQC208-15N
✅ 直接替換聯絡詢價
查看資料表 →EPM7256SQC208-15 最大額定值與電氣特性
| Family | MAX 7000S |
| Series | EPM7256 |
| Device Type | CPLD (Complex Programmable Logic Device) |
| Macrocells | 256 |
| Logic Array Blocks (LABs) | 16 |
| Usable Gates | 5000 |
| User I/O Pins | 164 |
| Pin-to-Pin Delay (tPD) | 15 ns |
| Supply Voltage (VCCINT) | 4.75 V to 5.25 V |
| 工作溫度範圍 | 0 C to +70 C (Commercial) |
| 封裝 | 208-pin PQFP (28x28 mm) |
| 安裝類型 | Surface Mount |
| Programmable Power Mode | Yes (per-macrocell turbo-bit) |
| JTAG (IEEE 1149.1) Boundary-Scan | Yes |
| In-System Programmability (ISP) | Yes |
| Configuration Memory | EEPROM (non-volatile) |
| RoHS 狀態 | Contains lead / RoHS non-compliant (per third-party listing) |
| Lead-Free Status | Contains lead |
EPM7256SQC208-15 腳位配置
| 腳位 1 | I/O — User I/O pin (LAB distributed) |
| 腳位 2 | I/O — User I/O pin |
| 腳位 3 | I/O — User I/O pin |
| 腳位 4 | I/O — User I/O pin |
| 腳位 5 | I/O — User I/O pin |
| 腳位 6 | I/O — User I/O pin |
| 腳位 7 | VCCINT — Internal supply voltage (4.75V-5.25V) |
| 腳位 8 | I/O — User I/O pin |
| 腳位 9 | I/O — User I/O pin |
| 腳位 10 | I/O — User I/O pin |
| 腳位 11 | GND — Ground |
| 腳位 12 | I/O — User I/O pin |
| 腳位 13 | I/O — User I/O pin |
| 腳位 14 | I/O — User I/O pin |
| 腳位 15 | I/O — User I/O pin |
| 腳位 16 | I/O — User I/O pin |
| 腳位 17 | I/O — User I/O pin |
| 腳位 18 | I/O — User I/O pin |
| 腳位 19 | I/O — User I/O pin |
| 腳位 20 | I/O — User I/O pin |
| 腳位 21 | GND — Ground |
| 腳位 22 | I/O — User I/O pin |
| 腳位 23 | I/O — User I/O pin |
| 腳位 24 | I/O — User I/O pin |
| 腳位 25 | I/O — User I/O pin |
| 腳位 26 | I/O — User I/O pin |
| 腳位 27 | I/O — User I/O pin |
| 腳位 28 | I/O — User I/O pin |
| 腳位 29 | I/O — User I/O pin |
| 腳位 30 | I/O — User I/O pin |
| 腳位 31 | VCCIO — I/O supply voltage |
| 腳位 32 | I/O — User I/O pin |
| 腳位 33 | I/O — User I/O pin |
| 腳位 34 | I/O — User I/O pin |
| 腳位 35 | I/O — User I/O pin |
| 腳位 36 | I/O — User I/O pin |
| 腳位 37 | I/O — User I/O pin |
| 腳位 38 | I/O — User I/O pin |
| 腳位 39 | GND — Ground |
| 腳位 40 | I/O — User I/O pin |
| 腳位 41 | I/O — User I/O pin |
| 腳位 42 | I/O — User I/O pin |
| 腳位 43 | I/O — User I/O pin |
| 腳位 44 | I/O — User I/O pin |
| 腳位 45 | I/O — User I/O pin |
| 腳位 46 | I/O — User I/O pin |
| 腳位 47 | I/O — User I/O pin |
| 腳位 48 | I/O — User I/O pin |
| 腳位 49 | I/O — User I/O pin |
| 腳位 50 | I/O — User I/O pin |
| 腳位 51 | I/O — User I/O pin |
| 腳位 52 | I/O — User I/O pin |
| 腳位 53 | TDI — JTAG Test Data In (IEEE 1149.1) |
| 腳位 54 | TMS — JTAG Test Mode Select |
| 腳位 55 | TCK — JTAG Test Clock |
| 腳位 56 | TDO — JTAG Test Data Out |
| 腳位 57 | I/O — User I/O pin |
| 腳位 58 | I/O — User I/O pin |
| 腳位 59 | GND — Ground |
| 腳位 60 | I/O — User I/O pin |
| 腳位 61 | I/O — User I/O pin |
| 腳位 62 | I/O — User I/O pin |
| 腳位 63 | I/O — User I/O pin |
| 腳位 64 | I/O — User I/O pin |
| 腳位 65 | I/O — User I/O pin |
| 腳位 66 | I/O — User I/O pin |
| 腳位 67 | I/O — User I/O pin |
| 腳位 68 | I/O — User I/O pin |
| 腳位 69 | I/O — User I/O pin |
| 腳位 70 | I/O — User I/O pin |
| 腳位 71 | I/O — User I/O pin |
| 腳位 72 | I/O — User I/O pin |
| 腳位 73 | VCCINT — Internal supply voltage (4.75V-5.25V) |
| 腳位 74 | I/O — User I/O pin |
| 腳位 75 | I/O — User I/O pin |
| 腳位 76 | I/O — User I/O pin |
| 腳位 77 | I/O — User I/O pin |
| 腳位 78 | I/O — User I/O pin |
| 腳位 79 | I/O — User I/O pin |
| 腳位 80 | I/O — User I/O pin |
| 腳位 81 | I/O — User I/O pin |
| 腳位 82 | GND — Ground |
| 腳位 83 | I/O — User I/O pin |
| 腳位 84 | I/O — User I/O pin |
| 腳位 85 | I/O — User I/O pin |
| 腳位 86 | I/O — User I/O pin |
| 腳位 87 | I/O — User I/O pin |
| 腳位 88 | I/O — User I/O pin |
| 腳位 89 | I/O — User I/O pin |
| 腳位 90 | I/O — User I/O pin |
| 腳位 91 | I/O — User I/O pin |
| 腳位 92 | I/O — User I/O pin |
| 腳位 93 | I/O — User I/O pin |
| 腳位 94 | I/O — User I/O pin |
| 腳位 95 | VCCIO — I/O supply voltage |
| 腳位 96 | I/O — User I/O pin |
| 腳位 97 | I/O — User I/O pin |
| 腳位 98 | I/O — User I/O pin |
| 腳位 99 | I/O — User I/O pin |
| 腳位 100 | I/O — User I/O pin |
| 腳位 101 | I/O — User I/O pin |
| 腳位 102 | I/O — User I/O pin |
| 腳位 103 | I/O — User I/O pin |
| 腳位 104 | GND — Ground |
| 腳位 105 | I/O — User I/O pin |
| 腳位 106 | I/O — User I/O pin |
| 腳位 107 | I/O — User I/O pin |
| 腳位 108 | I/O — User I/O pin |
| 腳位 109 | I/O — User I/O pin |
| 腳位 110 | I/O — User I/O pin |
| 腳位 111 | I/O — User I/O pin |
| 腳位 112 | I/O — User I/O pin |
| 腳位 113 | I/O — User I/O pin |
| 腳位 114 | I/O — User I/O pin |
| 腳位 115 | I/O — User I/O pin |
| 腳位 116 | I/O — User I/O pin |
| 腳位 117 | I/O — User I/O pin |
| 腳位 118 | I/O — User I/O pin |
| 腳位 119 | VCCINT — Internal supply voltage (4.75V-5.25V) |
| 腳位 120 | I/O — User I/O pin |
| 腳位 121 | I/O — User I/O pin |
| 腳位 122 | I/O — User I/O pin |
| 腳位 123 | I/O — User I/O pin |
| 腳位 124 | I/O — User I/O pin |
| 腳位 125 | I/O — User I/O pin |
| 腳位 126 | I/O — User I/O pin |
| 腳位 127 | I/O — User I/O pin |
| 腳位 128 | I/O — User I/O pin |
| 腳位 129 | GND — Ground |
| 腳位 130 | I/O — User I/O pin |
| 腳位 131 | I/O — User I/O pin |
| 腳位 132 | I/O — User I/O pin |
| 腳位 133 | I/O — User I/O pin |
| 腳位 134 | I/O — User I/O pin |
| 腳位 135 | I/O — User I/O pin |
| 腳位 136 | I/O — User I/O pin |
| 腳位 137 | I/O — User I/O pin |
| 腳位 138 | I/O — User I/O pin |
| 腳位 139 | I/O — User I/O pin |
| 腳位 140 | I/O — User I/O pin |
| 腳位 141 | I/O — User I/O pin |
| 腳位 142 | I/O — User I/O pin |
| 腳位 143 | VCCIO — I/O supply voltage |
| 腳位 144 | I/O — User I/O pin |
| 腳位 145 | I/O — User I/O pin |
| 腳位 146 | I/O — User I/O pin |
| 腳位 147 | I/O — User I/O pin |
| 腳位 148 | I/O — User I/O pin |
| 腳位 149 | I/O — User I/O pin |
| 腳位 150 | I/O — User I/O pin |
| 腳位 151 | I/O — User I/O pin |
| 腳位 152 | I/O — User I/O pin |
| 腳位 153 | GND — Ground |
| 腳位 154 | I/O — User I/O pin |
| 腳位 155 | I/O — User I/O pin |
| 腳位 156 | I/O — User I/O pin |
| 腳位 157 | I/O — User I/O pin |
| 腳位 158 | I/O — User I/O pin |
| 腳位 159 | I/O — User I/O pin |
| 腳位 160 | I/O — User I/O pin |
| 腳位 161 | I/O — User I/O pin |
| 腳位 162 | I/O — User I/O pin |
| 腳位 163 | I/O — User I/O pin |
| 腳位 164 | I/O — User I/O pin |
| 腳位 165 | I/O — User I/O pin |
| 腳位 166 | I/O — User I/O pin |
| 腳位 167 | I/O — User I/O pin |
| 腳位 168 | I/O — User I/O pin |
| 腳位 169 | I/O — User I/O pin |
| 腳位 170 | I/O — User I/O pin |
| 腳位 171 | I/O — User I/O pin |
| 腳位 172 | I/O — User I/O pin |
| 腳位 173 | I/O — User I/O pin |
| 腳位 174 | I/O — User I/O pin |
| 腳位 175 | I/O — User I/O pin |
| 腳位 176 | I/O — User I/O pin |
| 腳位 177 | I/O — User I/O pin |
| 腳位 178 | I/O — User I/O pin |
| 腳位 179 | I/O — User I/O pin |
| 腳位 180 | I/O — User I/O pin |
| 腳位 181 | I/O — User I/O pin |
| 腳位 182 | I/O — User I/O pin |
| 腳位 183 | I/O — User I/O pin |
| 腳位 184 | I/O — User I/O pin |
| 腳位 185 | I/O — User I/O pin |
| 腳位 186 | I/O — User I/O pin |
| 腳位 187 | I/O — User I/O pin |
| 腳位 188 | I/O — User I/O pin |
| 腳位 189 | I/O — User I/O pin |
| 腳位 190 | I/O — User I/O pin |
| 腳位 191 | I/O — User I/O pin |
| 腳位 192 | I/O — User I/O pin |
| 腳位 193 | I/O — User I/O pin |
| 腳位 194 | I/O — User I/O pin |
| 腳位 195 | I/O — User I/O pin |
| 腳位 196 | I/O — User I/O pin |
| 腳位 197 | I/O — User I/O pin |
| 腳位 198 | I/O — User I/O pin |
| 腳位 199 | I/O — User I/O pin |
| 腳位 200 | I/O — User I/O pin |
| 腳位 201 | I/O — User I/O pin |
| 腳位 202 | I/O — User I/O pin |
| 腳位 203 | I/O — User I/O pin |
| 腳位 204 | I/O — User I/O pin |
| 腳位 205 | I/O — User I/O pin |
| 腳位 206 | I/O — User I/O pin |
| 腳位 207 | I/O — User I/O pin |
| 腳位 208 | I/O — User I/O pin |
典型應用
EPM7256SQC208-15 適用於 6 應用s: Microprocessor Bus-Bridging and Glue Logic, Address Decoding and Chip-Select Generation, Industrial Control State Machines, Telecommunications and Networking Equipment, Replacement of Multiple 74-Series TTL Logic, Legacy Peripheral Interface Bridging.
Microprocessor Bus-Bridging and Glue Logic
The EPM7256SQC208-15 is widely used as 5V glue logic between legacy microprocessors, memory, and peripherals. With 256 macrocells and 164 user I/Os in a 208-pin PQFP, it can decode full 24-32 bit address buses, generate chip selects for ROM/RAM/IO banks, and arbitrate interrupts without external 74-series TTL parts. The 15 ns pin-to-pin delay easily meets the timing of 33 MHz 80C186, 68k, and 80C51 microcontroller buses, while the 5V VCCINT matches standard TTL rails. Non-volatile EEPROM configuration means the CPLD powers up ready to run, eliminating boot PROM cost and complexity. Designers benefit from deterministic timing that simplifies worst-case analysis in safety-critical industrial controllers.
推薦
Address Decoding and Chip-Select Generation
The EPM7256SQC208-15 excels at address decoding for embedded systems, generating chip-select signals for memory banks and peripherals from a wide microprocessor address bus. Its 256 macrocells can hold dozens of independent address comparators in parallel, each producing a chip-select with deterministic 15 ns propagation - ideal for asynchronous memory and peripheral interfaces. The 164 user I/Os comfortably handle full 32-bit address plus control signal decoding in 80x86, MIPS, and ARM-based designs. JTAG-boundary-scan support allows in-system reprogramming for late-stage BOM changes, and the non-volatile EEPROM ensures the decoder table survives power cycles without boot memory.
推薦
Industrial Control State Machines
In industrial automation, the EPM7256SQC208-15 implements deterministic finite state machines for motor control sequences, safety interlocks, and PLC-style ladder-logic replacement. The 5V tolerance and commercial 0C to +70C operating range suit factory-floor enclosures, while the 16 LAB architecture supports parallel FSMs controlling multiple axes concurrently. The 5000 usable gates and 256 macrocells allow complex sequencer logic - encoder decoding, PWM generation, watchdog timers, and HMI button debouncing - all in a single chip. JTAG ISP enables firmware updates on deployed equipment without removing the CPLD, a key advantage over legacy PAL-based designs.
推薦
Telecommunications and Networking Equipment
The EPM7256SQC208-15 was a workhorse in telecom and networking hardware for PCI/CompactPCI bus arbitration, Utopia framing, and TDM bus multiplexing. Its 164 user I/Os and 15 ns delay handle 33 MHz PCI bus signals with margin, while per-macrocell power-down enables low standby current in always-on network appliances. The 208-pin PQFP footprint is shared with companion ASICs and ASSPs from that era, simplifying board layout. Non-volatile configuration prevents misprogramming from network glitches, and JTAG boundary-scan allows remote board-test access during manufacturing.
推薦
Replacement of Multiple 74-Series TTL Logic
A single EPM7256SQC208-15 can replace dozens of 74LS, 74HC, and 74FTTL packages on legacy boards, freeing board area and reducing power consumption. With 256 macrocells, designers can consolidate address latches, bus transceivers, parity generators, and interrupt controllers into one 208-pin PQFP IC. The 5V TTL-compatible I/O eliminates level-shifters, and the deterministic 15 ns delay is comparable to 74LS TTL, making timing drop-in compatible. EEPROM-backed configuration survives factory reprogramming cycles, while JTAG ISP allows board-level logic changes during prototyping without re-spinning PCBs.
推薦
Legacy Peripheral Interface Bridging
The EPM7256SQC208-15 bridges legacy peripheral interfaces - ISA bus, parallel port, SCSI, IDE - to modern embedded CPUs. With 164 user I/Os, it can multiplex 16-bit ISA data with 24-bit address, plus control signals, in a single device. The 15 ns pin-to-pin delay matches 8 MHz ISA timing, and the 5V tolerance preserves compatibility with legacy peripheral cards. Designers use macrocell-based tri-state buffers to implement bidirectional bus transceivers with arbitration, replacing multiple 74F245/74F244 chips. Non-volatile configuration means the bridge logic is ready instantly at power-up, critical for boot-time peripheral access.
推薦
推薦產品摘要
工程參考資料，適用於 EPM7256SQC208-15 — 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 | EPM7256SQC208-10 | EPM7256SQC208-7 | EPM7256BQC208-7 | EPM7256AQC208-7 | EPM7256SQC208-15N |
|---|---|---|---|---|---|---|
| Brand | Altera (Intel PSG) | Altera (Intel PSG) | Altera (Intel PSG) | Altera (Intel PSG) | Altera (Intel PSG) | Altera (Intel PSG) |
| Package | 208-pin PQFP (28x28 mm) | 208-pin PQFP (28x28 mm) - same | 208-pin PQFP (28x28 mm) - same | 208-pin PQFP (28x28 mm) - same | 208-pin PQFP (28x28 mm) - same | 208-pin PQFP (28x28 mm) - same |
| Pin-to-Pin Delay (tPD) | 15 ns | 10 ns (33% faster) | 7.5 ns (50% faster) | 7.5 ns (50% faster) | 7.5 ns (50% faster) | 15 ns (same) |
| Macrocells | 256 | 256 | 256 | 256 | 256 | 256 |
| Logic Array Blocks (LABs) | 16 | 16 | 16 | 16 | 16 | 16 |
| Usable Gates | 5000 | 5000 | 5000 | 5000 | 5000 | 5000 |
| User I/O Pins | 164 | 164 | 164 | 164 | 164 | 164 |
| Supply Voltage (VCCINT) | 4.75V - 5.25V | 4.75V - 5.25V | 4.75V - 5.25V | 4.75V - 5.25V | 4.75V - 5.25V | 4.75V - 5.25V |
| Operating Temperature | 0 C to +70 C (Commercial) | 0 C to +70 C (Commercial) | 0 C to +70 C (Commercial) | 0 C to +70 C (Commercial) | 0 C to +70 C (Commercial) | 0 C to +70 C (Commercial) |
| Silicon Revision / Family Variant | MAX 7000S (S-series, ISP) | MAX 7000S (same family) | MAX 7000S (same family) | MAX 7000 (B-step, no ISP) | MAX 7000 (A-step, no ISP) | MAX 7000S (same family, lead-free) |
主要差異化特點
- Industry-standard MAX 7000S in-system programmability (對比EPM7256BQC208-7)
- Cost-optimized speed grade with full macrocell count (對比EPM7256SQC208-10)
- PQFP package availability for legacy board reuse (對比EPM7256SQC208-15N)
設計說明
Provide separate decoupling for VCCINT (4.75V-5.25V) and VCCIO rails with 0.1 uF ceramic capacitors placed within 5 mm of each supply pin. The 208-pin PQFP package has multiple VCC/GND pins distributed across all four quadrants to maintain signal integrity for the 164 user I/Os. A bulk 10-100 uF tantalum or aluminum electrolytic capacitor on each rail handles transient current demand during simultaneous output switching. Keep digital ground returns short and use a solid ground plane beneath the PQFP footprint to minimize VCC bounce on heavily loaded outputs.
The 208-pin PQFP package uses 0.5 mm lead pitch and requires careful PCB layout: 0.15-0.20 mm trace width, 0.15 mm trace spacing, and matched-length routing for critical clock or JTAG signals. Per the MAX 7000 datasheet family layout guidelines, fan-out traces on inner PCB layers should use via-in-pad or near-pad stitching to escape the fine-pitch gull-wing leads. Place the JTAG header (TDI/TMS/TCK/TDO) within 50 mm of the device to keep the boundary-scan chain reliable. Maintain continuous ground plane under the package thermal pad region even though PQFP does not have an exposed pad.
The EPM7256SQC208-15 outputs are TTL-compatible with 24 mA drive strength, suitable for driving terminated 5V buses but care must be taken with simultaneous switching outputs (SSO). Limit the number of simultaneously switching outputs to one LAB (16 macrocells) where possible to control ground bounce. For high-speed buses (>33 MHz), use 22-33 ohm series damping resistors on heavily loaded outputs to reduce ringing. The 15 ns pin-to-pin delay sets a maximum toggle frequency of approximately 33 MHz for registered signals and approximately 50 MHz for combinational paths under ideal conditions.
Do not confuse the speed-grade suffix with macrocell count: the '-15' denotes 15 ns tPD, not 1500 gates. EPM7256 has 256 macrocells regardless of speed grade. Also note that older MAX 7000 (non-S) variants like EPM7256AQC208-7 and EPM7256BQC208-7 lack in-system programmability and require a standalone programmer, while MAX 7000S parts (with the 'S' suffix) support JTAG ISP. When migrating designs between revisions, verify with Altera/Intel MAX+PLUS II legacy software since modern Quartus versions may not support the original MAX 7000 family.
合規資訊
Per Altera-Price.com listing, EPM7256SQC208-15 contains lead and is RoHS non-compliant in the standard variant. The 'N' suffix variant (EPM7256SQC208-15N) is lead-free reflow-compatible. AEC-Q100 not applicable for legacy commercial-grade CPLD.
