EPM7256SRC208-15N - MAX 7000S CPLD 256 Macro | Altera
MPN: EPM7256SRC208-15N ✗ סוף ייצורEPM7256SRC208-15N סקירה
A CPLD (Complex Programmable Logic Device) is a programmable logic IC that combines multiple logic blocks, macrocells, and a programmable interconnect array on a single die. CPLDs sit between simple PAL/GAL devices and full FPGAs in the programmable logic hierarchy: they offer non-volatile configuration, deterministic timing, and instant-on operation, making them ideal for glue logic, bus interfacing, and state machines. The MAX 7000S family is built on Altera's second-generation MAX architecture using EEPROM cells, so configuration is retained without an external boot device.
Key features of the EPM7256SRC208-15N include 256 macrocells organized into 16 logic array blocks (LABs), 164 I/O pins, 5,000 usable gates, and a maximum counter frequency of 76.9 MHz. The 15 ns pin-to-pin delay provides predictable, fixed timing without the routing-dependent variability of SRAM-based FPGAs. The device supports in-system programmability (ISP) via the IEEE 1149.1 JTAG interface, allowing field upgrades without removing the part from the board.
The MAX 7000S architecture uses a programmable interconnect array (PIA) to route signals between LABs, giving deterministic propagation delays. Each macrocell contains a flip-flop with independent clock, clear, and preset controls, plus product-term logic for combinatorial functions. The EEPROM process provides high noise immunity and 5 V TTL/CMOS-compatible I/O, simplifying interfacing to legacy 5 V logic.
Typical applications include PCI bus glue logic, ISA/PC-104 interface controllers, industrial automation state machines, telecommunications line-card control, test-and-measurement instrumentation, and legacy system replacement where 5 V logic and non-volatile configuration are required.
When designing with this CPLD, ensure the 5 V supply is well decoupled with 0.1 uF ceramic capacitors on every VCC pin, and reserve the JTAG pins for in-system programming. The 208-pin RQFP package requires careful thermal and signal-integrity layout for the 164 I/O pins.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet, providing engineers with a single reference for selection, replacement, and layout decisions.
חלופות תחליף ישיר עבור EPM7256SRC208-15N — אותו מארז, תואם פין-לפין. חלקים במארז שונה הדורשים עיבוד מחדש של ה-PCB אינם נכללים.
וריאנטים בסדרה זו
דגמים מאותה סדרה התואמים Drop-in עם EPM7256SRC208-15N (אותו גורם צורה וטביעת רגל) — שונים ב Package, RoHS Status, Operating Temperature, Pin-to-Pin Delay (tPD), Speed Grade.
EPM7256SRC208-10N
✅ Drop-Inצור קשר לקבלת מחיר
הצג גיליון נתונים ←EPM7256SRC208-10
✅ Drop-Inצור קשר לקבלת מחיר
הצג גיליון נתונים ←EPM7256SQC208-10
✅ Drop-Inצור קשר לקבלת מחיר
הצג גיליון נתונים ←EPM7256SQC208-15N
✅ Drop-Inצור קשר לקבלת מחיר
הצג גיליון נתונים ←EPM7256SQC208-15
✅ Drop-Inצור קשר לקבלת מחיר
הצג גיליון נתונים ←EPM7256SQC208-7N
✅ Drop-Inצור קשר לקבלת מחיר
הצג גיליון נתונים ←EPM7256SRC208-15N דירוגים מרביים ומאפיינים חשמליים
| Series | MAX 7000S |
| Macrocells | 256 |
| Usable Gates | 5,000 |
| User I/O Pins | 164 |
| Logic Array Blocks (LABs) | 16 |
| Pin-to-Pin Delay (tPD) | 15 ns |
| Maximum Counter Frequency | 76.9 MHz |
| מתח אספקה | 5 V |
| Configuration Memory | EEPROM (non-volatile) |
| מארז | 208-pin RQFP (PowerQuad Flat Pack) |
| סוג הרכבה | Surface Mount |
| טמפרטורת פעולה | 0C to +70C (commercial) |
| In-System Programmability | Yes (IEEE 1149.1 JTAG) |
| I/O Standard | 5 V TTL/CMOS compatible |
| סטטוס RoHS | Compliant (N suffix) |
| Lead Free | Yes (N suffix) |
| Number of Terminals | 208 |
תצורת פינים של EPM7256SRC208-15N
| פין 1 | I/O — User I/O pin |
| פין 2 | I/O — User I/O pin |
| פין 3 | I/O — User I/O pin |
| פין 4 | I/O — User I/O pin |
| פין 5 | I/O — User I/O pin |
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| פין 9 | I/O — User I/O pin |
| פין 10 | I/O — User I/O pin |
| פין 11 | I/O — User I/O pin |
| פין 12 | I/O — User I/O pin |
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| פין 30 | I/O — User I/O pin |
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| פין 48 | I/O — User I/O pin |
| פין 49 | I/O — User I/O pin |
| פין 50 | I/O — User I/O pin |
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| פין 52 | I/O — User I/O pin |
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| פין 54 | I/O — User I/O pin |
| פין 55 | I/O — User I/O pin |
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| פין 58 | I/O — User I/O pin |
| פין 59 | I/O — User I/O pin |
| פין 60 | I/O — User I/O pin |
| פין 61 | I/O — User I/O pin |
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| פין 64 | I/O — User I/O pin |
| פין 65 | I/O — User I/O pin |
| פין 66 | I/O — User I/O pin |
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| פין 68 | I/O — User I/O pin |
| פין 69 | I/O — User I/O pin |
| פין 70 | I/O — User I/O pin |
| פין 71 | I/O — User I/O pin |
| פין 72 | I/O — User I/O pin |
| פין 73 | I/O — User I/O pin |
| פין 74 | I/O — User I/O pin |
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| פין 89 | I/O — User I/O pin |
| פין 90 | I/O — User I/O pin |
| פין 91 | I/O — User I/O pin |
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| פין 98 | I/O — User I/O pin |
| פין 99 | I/O — User I/O pin |
| פין 100 | I/O — User I/O pin |
| פין 101 | I/O — User I/O pin |
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| פין 103 | I/O — User I/O pin |
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| פין 105 | I/O — User I/O pin |
| פין 106 | I/O — User I/O pin |
| פין 107 | I/O — User I/O pin |
| פין 108 | I/O — User I/O pin |
| פין 109 | I/O — User I/O pin |
| פין 110 | I/O — User I/O pin |
| פין 111 | I/O — User I/O pin |
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| פין 114 | I/O — User I/O pin |
| פין 115 | I/O — User I/O pin |
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| פין 127 | I/O — User I/O pin |
| פין 128 | I/O — User I/O pin |
| פין 129 | I/O — User I/O pin |
| פין 130 | I/O — User I/O pin |
| פין 131 | I/O — User I/O pin |
| פין 132 | I/O — User I/O pin |
| פין 133 | I/O — User I/O pin |
| פין 134 | I/O — User I/O pin |
| פין 135 | I/O — User I/O pin |
| פין 136 | I/O — User I/O pin |
| פין 137 | I/O — User I/O pin |
| פין 138 | I/O — User I/O pin |
| פין 139 | I/O — User I/O pin |
| פין 140 | I/O — User I/O pin |
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| פין 145 | I/O — User I/O pin |
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| פין 147 | I/O — User I/O pin |
| פין 148 | I/O — User I/O pin |
| פין 149 | I/O — User I/O pin |
| פין 150 | I/O — User I/O pin |
| פין 151 | I/O — User I/O pin |
| פין 152 | I/O — User I/O pin |
| פין 153 | I/O — User I/O pin |
| פין 154 | I/O — User I/O pin |
| פין 155 | I/O — User I/O pin |
| פין 156 | I/O — User I/O pin |
| פין 157 | I/O — User I/O pin |
| פין 158 | I/O — User I/O pin |
| פין 159 | I/O — User I/O pin |
| פין 160 | I/O — User I/O pin |
| פין 161 | I/O — User I/O pin |
| פין 162 | I/O — User I/O pin |
| פין 163 | I/O — User I/O pin |
| פין 164 | I/O — User I/O pin |
| פין 165 | VCC — 5 V power supply |
| פין 166 | GND — Ground |
| פין 167 | VCC — 5 V power supply |
| פין 168 | GND — Ground |
| פין 169 | VCC — 5 V power supply |
| פין 170 | GND — Ground |
| פין 171 | VCC — 5 V power supply |
| פין 172 | GND — Ground |
| פין 173 | VCC — 5 V power supply |
| פין 174 | GND — Ground |
| פין 175 | VCC — 5 V power supply |
| פין 176 | GND — Ground |
| פין 177 | VCC — 5 V power supply |
| פין 178 | GND — Ground |
| פין 179 | VCC — 5 V power supply |
| פין 180 | GND — Ground |
| פין 181 | VCC — 5 V power supply |
| פין 182 | GND — Ground |
| פין 183 | VCC — 5 V power supply |
| פין 184 | GND — Ground |
| פין 185 | VCC — 5 V power supply |
| פין 186 | GND — Ground |
| פין 187 | VCC — 5 V power supply |
| פין 188 | GND — Ground |
| פין 189 | VCC — 5 V power supply |
| פין 190 | GND — Ground |
| פין 191 | VCC — 5 V power supply |
| פין 192 | GND — Ground |
| פין 193 | VCC — 5 V power supply |
| פין 194 | GND — Ground |
| פין 195 | VCC — 5 V power supply |
| פין 196 | GND — Ground |
| פין 197 | VCC — 5 V power supply |
| פין 198 | GND — Ground |
| פין 199 | VCC — 5 V power supply |
| פין 200 | GND — Ground |
| פין 201 | VCC — 5 V power supply |
| פין 202 | GND — Ground |
| פין 203 | VCC — 5 V power supply |
| פין 204 | GND — Ground |
| פין 205 | TDI — JTAG test data input |
| פין 206 | TDO — JTAG test data output |
| פין 207 | TMS — JTAG test mode select |
| פין 208 | TCK — JTAG test clock |
יישומים טיפוסיים
EPM7256SRC208-15N מתאים עבור 6 יישוםs: PCI Bus Glue Logic, Industrial Automation State Machine, Telecommunications Line-Card Control, Test and Measurement Instrumentation, Legacy System Replacement and Repair, Military and Aerospace Avionics Control.
PCI Bus Glue Logic
The EPM7256SRC208-15N fits PCI bus glue logic because its 164 user I/O pins and 15 ns pin-to-pin delay meet the 33 MHz PCI timing budget, while the 5 V TTL/CMOS-compatible I/O interfaces directly to legacy PCI controllers without level shifters. The device implements address decoding, wait-state generation, and interrupt steering between a host bridge and peripheral devices. Placed between the PCI bus and peripheral ASICs, it replaces dozens of discrete 74-series logic gates, reducing board area and power. Unlike SRAM-based FPGAs, the EEPROM configuration is instant-on, so the CPLD is active before the host processor boots, which is essential for PCI configuration cycles. The 256 macrocells provide ample product-term logic for complex decode functions, and JTAG ISP allows field firmware updates without removing the part.
מומלץ
Industrial Automation State Machine
The EPM7256SRC208-15N is well suited to industrial automation state machines because its 256 macrocells and 76.9 MHz counter frequency handle multi-state control logic with deterministic 15 ns timing, and the 5 V I/O interfaces directly to industrial sensors and relay drivers. The CPLD implements sequence control, encoder decoding, and safety interlock logic on a factory floor controller. Its EEPROM configuration retains the state machine definition through power cycles without a battery or boot PROM, which is critical in harsh industrial environments where instant-on recovery is required. The 164 I/O pins allow direct connection to limit switches, pneumatic valves, and motor contactors. Unlike a microcontroller, the CPLD executes all logic in parallel, giving fixed-latency response independent of program flow, which simplifies worst-case timing analysis for safety functions.
מומלץ
Telecommunications Line-Card Control
The EPM7256SRC208-15N serves telecommunications line-card control because its 164 I/O pins and 256 macrocells manage TDM framing, timeslot assignment, and alarm monitoring across multiple line interfaces, while the 15 ns pin-to-pin delay supports the tight timing of E1/T1 and SONET overhead processing. The CPLD sits between line interface units and a backplane controller, implementing glue logic that would otherwise require multiple discrete devices. The 5 V supply and TTL-compatible I/O match legacy telecom backplane signaling, and the non-volatile EEPROM configuration ensures the line card is operational immediately after hot-swap insertion, avoiding the configuration latency of SRAM FPGAs. The 76.9 MHz counter frequency provides headroom for clock division and pulse generation. JTAG ISP enables remote firmware upgrades through the backplane, reducing field service costs.
מומלץ
Test and Measurement Instrumentation
The EPM7256SRC208-15N is used in test and measurement instrumentation because its deterministic 15 ns pin-to-pin delay and 76.9 MHz counter frequency enable precise trigger generation, event counting, and timing control in oscilloscopes, logic analyzers, and automated test equipment. The 256 macrocells implement pattern generators, state sequencers, and bus capture logic, while the 164 I/O pins interface to measurement front-ends and host processors. The 5 V TTL/CMOS I/O matches the signaling of legacy instrument buses such as GPIB and VME. Because the EEPROM configuration is non-volatile, the instrument boots instantly without a configuration PROM, which is important for benchtop equipment that must be ready immediately. The CPLD's parallel architecture guarantees fixed-latency response, simplifying calibration and repeatability analysis in precision measurement applications.
מומלץ
Legacy System Replacement and Repair
The EPM7256SRC208-15N is a key part for legacy system replacement and repair because it is an obsolete MAX 7000S CPLD still required to maintain 5 V designs in service. Its 208-pin RQFP package and 164 I/O pins match the original footprint, so a failed device can be replaced without PCB redesign. The EEPROM configuration preserves the original logic design, and JTAG ISP allows reprogramming from an existing JEDEC file. Engineers maintaining industrial controllers, medical equipment, and aerospace systems rely on this part to extend product life cycles. Because the device is obsolete, drop-in alternatives such as the EPM7256SRC208-10N and EPM7256SQC208-15N provide second-source options. The 5 V supply and TTL-compatible I/O ensure compatibility with surrounding legacy logic.
מומלץ
Military and Aerospace Avionics Control
The EPM7256SRC208-15N is used in military and aerospace avionics control because its non-volatile EEPROM configuration provides instant-on operation and immunity to radiation-induced configuration loss that affects SRAM FPGAs. The 256 macrocells implement flight-control sequencing, actuator interface logic, and sensor data routing, while the 164 I/O pins connect to avionics buses and discrete I/O. The 15 ns pin-to-pin delay gives deterministic timing for safety-critical functions, and the 5 V TTL/CMOS I/O matches legacy avionics signaling. The 208-pin RQFP package is available in commercial temperature grades; extended-temperature variants should be selected for avionics use. Because the part is obsolete, designers should qualify drop-in alternatives such as the EPM7256SRC208-10N to ensure long-term supply for avionics programs.
מומלץ
סיכום מוצרים מומלצים
נתוני עזר הנדסיים עבור EPM7256SRC208-15N — השוואה, הנחיות תכנון ומידע על תאימות.
מדריך בחירה
השוואה עם חלופות
| פרמטר | מוצר זה | EPM7256SRC208-10N | EPM7256SRC208-10 | EPM7256SQC208-10 | EPM7256SQC208-15N |
|---|---|---|---|---|---|
| Package | 208-pin RQFP | 208-pin RQFP - same | 208-pin RQFP - same | 208-pin PQFP | 208-pin PQFP |
| Brand | Altera | Altera | Altera | Altera | Altera |
| Pin-to-Pin Delay (tPD) | 15 ns | 10 ns | 10 ns | 10 ns | 15 ns |
| Macrocells | 256 | 256 | 256 | 256 | 256 |
| User I/O Pins | 164 | 164 | 164 | 164 | 164 |
| Supply Voltage | 5 V | 5 V | 5 V | 5 V | 5 V |
| Max Counter Frequency | 76.9 MHz | 100 MHz | 100 MHz | 100 MHz | 76.9 MHz |
| Lead Free | Yes (N suffix) | Yes (N suffix) | No | No | Yes (N suffix) |
| Configuration Memory | EEPROM (non-volatile) | EEPROM (non-volatile) | EEPROM (non-volatile) | EEPROM (non-volatile) | EEPROM (non-volatile) |
| JTAG ISP | Yes (IEEE 1149.1) | Yes (IEEE 1149.1) | Yes (IEEE 1149.1) | Yes (IEEE 1149.1) | Yes (IEEE 1149.1) |
מבדילים עיקריים
- Non-volatile EEPROM configuration (לעומתSRAM-based FPGAs)
- Deterministic 15 ns pin-to-pin timing (לעומתEPM7256SRC208-10N)
- 5 V TTL/CMOS-compatible I/O (לעומתEPM7256SQC208-10)
הערות תכנון
Decouple every VCC pin of the EPM7256SRC208-15N with a 0.1 uF ceramic capacitor placed as close to the pin as possible, plus at least one 10 uF bulk capacitor per power plane. The MAX 7000S device draws transient current during logic switching, and inadequate decoupling causes ground bounce and false switching on the 164 I/O pins. Use a low-inductance ground plane and keep the decoupling loop area minimal.
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. Terminate TCK with a series resistor if reflections occur. Reserve a 10-pin JTAG header on the board so the EEPROM configuration can be updated in the field without removing the 208-pin RQFP package.
The EPM7256SRC208-15N is obsolete, so verify distributor stock before committing to production. Do not substitute a different package (for example PQFP for RQFP) without confirming the land pattern, because the RQFP and PQFP footprints are not identical. When migrating to the EPM7256SRC208-10N, re-run static timing analysis because the faster speed grade changes setup and hold margins.
מידע על תאימות
The N suffix indicates lead-free/RoHS-compliant construction. REACH, halogen-free, and conflict-minerals status were not stated in the provided data and are marked unknown.