EPM7256AQC208-7 - MAX 7000A CPLD 256 Macrocells | Altera
Référence : EPM7256AQC208-7 ✗ Fin de vie| Qté | Prix unitaire | Total |
|---|---|---|
| 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 |
EPM7256AQC208-7 Présentation
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 volatile SRAM configuration, a CPLD uses non-volatile EEPROM cells and coarse-grained macrocells, giving it deterministic timing, instant-on operation, and high immunity to single-event upsets. In the product hierarchy, the EPM7256AQC208-7 sits within CPLD -> programmable logic device (PLD) -> embedded programmable logic -> digital integrated circuit.
Key features include 256 macrocells organized into 16 logic array blocks (LABs), 5,000 usable gates, in-system programmability (ISP) via the IEEE 1149.1 JTAG interface, and MultiVolt I/O that allows the 3.3 V core to interface directly with 5.0 V, 3.3 V, and 2.5 V logic levels. The 7 ns speed grade supports 125 MHz counter operation and 227.3 MHz internal toggle rates, sufficient for PCI bus interfacing, DMA control, and high-speed state machines.
The MAX 7000A architecture uses EEPROM configuration cells, so the device retains its configuration without an external boot PROM and is immediately active at power-up. Each macrocell provides programmable flip-flops with independent clock, clear, and preset, plus product-term allocation that can be shared across macrocells to implement wide combinatorial functions. The 208-pin PQFP provides 164 user I/O pins, giving high pin-count density for address decoding, chip-select generation, and peripheral expansion.
Typical applications include industrial control and factory automation glue logic, legacy PCI/ISA bus bridging, telecommunications line-card control, test and measurement instrumentation, and lighting control systems. The wide 3.0-3.6 V supply and 5 V-tolerant I/O make it suitable for mixed-voltage retrofits of older 5 V designs.
When designing with this device, note that the MAX 7000A family is a mature, non-volatile CPLD family; designs should be compiled with Quartus II 13.0sp1 or earlier, the last toolchain release supporting MAX 7000A. This page synthesizes distributor availability, drop-in alternatives, and practical design notes not found in the manufacturer datasheet.
Alternatives de remplacement direct pour EPM7256AQC208-7 — même boîtier, compatible broche à broche. Les références à boîtier différent nécessitant une retouche du PCB sont exclues.
Variantes de cette série
Modèles de la même série directement compatibles avec EPM7256AQC208-7 (même facteur de forme et même empreinte) — différant par Package, RoHS Status, Family, User I/O Pins, Operating Temperature Range.
Outil de comparaison rapide — sélectionnez des références alternatives pour une comparaison côte à côte :
EPM7256AQC208-7N
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
EPM7256AQC208-10
✅ Remplacement direct ⚠️ Spécifications non vérifiées📋 Alternative de référence (hors catalogue)
EPM7256AQC208-10N
✅ Remplacement direct ⚠️ Spécifications non vérifiées📋 Alternative de référence (hors catalogue)
EPM7256AQC208-5
✅ Remplacement direct ⚠️ Spécifications non vérifiées📋 Alternative de référence (hors catalogue)
EPM7256AQC208-15
✅ Remplacement direct ⚠️ Spécifications non vérifiées📋 Alternative de référence (hors catalogue)
EPM7256AEQC208-7N
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
EPM7256AQC208-7 Valeurs maximales et caractéristiques électriques
| Family | MAX 7000A |
| Programmable Type | In System Programmable (ISP), EEPROM-based |
| Macrocells | 256 |
| Usable Gates | 5,000 |
| Logic Array Blocks (LABs) | 16 |
| Maximum User I/O Pins | 164 |
| Pin-to-Pin Logic Delay (tPD) | 7 ns |
| Maximum Counter Frequency | 125 MHz |
| Internal Toggle Frequency | 227.3 MHz |
| Supply Voltage - Internal | 3.0 V to 3.6 V |
| I/O Voltage Compatibility | 5.0 V, 3.3 V, 2.5 V (MultiVolt I/O) |
| Boîtier | 208-Pin PQFP (28 x 28 mm) |
| Supplier Device Package | 208-PQFP (28x28) |
| Type de montage | Surface Mount |
| Plage de température de fonctionnement | 0C to +70C (commercial) |
| JTAG Interface | IEEE 1149.1 (JTAG) boundary scan |
| Configuration Memory | EEPROM (non-volatile) |
| Speed Grade | -7 |
Configuration des broches de EPM7256AQC208-7
| Broche 1 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Broche 2 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Broche 3 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Broche 4 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Broche 5 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Broche 6 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Broche 7 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Broche 8 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Broche 9 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Broche 10 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Broche 11 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Broche 12 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Broche 13 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Broche 14 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Broche 15 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Broche 16 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Broche 17 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Broche 18 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Broche 19 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Broche 20 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Broche 21 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Broche 22 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Broche 23 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Broche 24 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Broche 25 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Broche 26 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Broche 27 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Broche 28 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Broche 29 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Broche 30 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Broche 31 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Broche 32 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Broche 33 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Broche 34 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Broche 35 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Broche 36 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Broche 37 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Broche 38 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Broche 39 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Broche 40 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Broche 41 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Broche 42 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Broche 43 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Broche 44 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Broche 45 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Broche 46 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Broche 47 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Broche 48 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Broche 49 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Broche 50 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Broche 51 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Broche 52 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Broche 53 | GND — Ground |
| Broche 54 | VCCINT — Internal 3.3 V core supply |
| Broche 55 | GND — Ground |
| Broche 56 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Broche 57 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Broche 58 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Broche 59 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Broche 60 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Broche 61 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Broche 62 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Broche 63 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Broche 64 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Broche 65 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Broche 66 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Broche 67 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Broche 68 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Broche 69 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Broche 70 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Broche 71 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Broche 72 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Broche 73 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Broche 74 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Broche 75 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Broche 76 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Broche 77 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Broche 78 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Broche 79 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Broche 80 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Broche 81 | I/O — General-purpose user I/O (MultiVolt compatible) |
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| Broche 85 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Broche 86 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Broche 87 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Broche 88 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Broche 89 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Broche 90 | I/O — General-purpose user I/O (MultiVolt compatible) |
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| Broche 99 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Broche 100 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Broche 101 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Broche 102 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Broche 103 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Broche 104 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Broche 105 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Broche 106 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Broche 107 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Broche 108 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Broche 109 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Broche 110 | I/O — General-purpose user I/O (MultiVolt compatible) |
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| Broche 112 | I/O — General-purpose user I/O (MultiVolt compatible) |
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| Broche 114 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Broche 115 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Broche 116 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Broche 117 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Broche 118 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Broche 119 | I/O — General-purpose user I/O (MultiVolt compatible) |
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| Broche 127 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Broche 128 | I/O — General-purpose user I/O (MultiVolt compatible) |
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| Broche 131 | I/O — General-purpose user I/O (MultiVolt compatible) |
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| Broche 138 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Broche 139 | I/O — General-purpose user I/O (MultiVolt compatible) |
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| Broche 143 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Broche 144 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Broche 145 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Broche 146 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Broche 147 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Broche 148 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Broche 149 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Broche 150 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Broche 151 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Broche 152 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Broche 153 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Broche 154 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Broche 155 | I/O — General-purpose user I/O (MultiVolt compatible) |
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| Broche 157 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Broche 158 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Broche 159 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Broche 160 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Broche 161 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Broche 162 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Broche 163 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Broche 164 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Broche 165 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Broche 166 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Broche 167 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Broche 168 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Broche 169 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Broche 170 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Broche 171 | I/O — General-purpose user I/O (MultiVolt compatible) |
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| Broche 195 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Broche 196 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Broche 197 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Broche 198 | I/O — General-purpose user I/O (MultiVolt compatible) |
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| Broche 207 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Broche 208 | I/O — General-purpose user I/O (MultiVolt compatible) |
Applications typiques
EPM7256AQC208-7 convient pour 6 applications: Industrial Control and Factory Automation, Legacy PCI and ISA Bus Bridging, Telecommunications Line-Card Control, Test and Measurement Instrumentation, Lighting Control Systems, Military and Aerospace Legacy Retrofit.
Industrial Control and Factory Automation
The EPM7256AQC208-7 fits industrial control designs because its 164 user I/O pins and 256 macrocells can absorb the address decoding, chip-select generation, and handshake logic that would otherwise require dozens of discrete 74-series devices. Its 3.0-3.6 V core with MultiVolt I/O tolerates 5.0 V, 3.3 V, and 2.5 V peripherals on the same board, simplifying mixed-voltage retrofits. Because configuration is stored in non-volatile EEPROM, the CPLD is active within microseconds of power-up, which matters for machine-safety interlocks that cannot wait for an external boot PROM. A typical implementation places the device between a host microcontroller and motor-driver or relay-driver stages, where its 7 ns pin-to-pin delay keeps interlock response deterministic. The trade-off is static power: EEPROM-based MAX 7000A devices draw more quiescent current than modern flash CPLDs, so thermal budgeting should account for the 208-pin PQFP package dissipation.
Recommandé
Legacy PCI and ISA Bus Bridging
The EPM7256AQC208-7 is commonly used to bridge legacy PCI and ISA buses to modern peripherals because its 7 ns pin-to-pin delay and 125 MHz counter frequency provide adequate timing margin for PCI clock domains up to 33 MHz. The 164 user I/O pins allow direct connection of a 32-bit address/data bus plus control strobes without external multiplexing, and the 256 macrocells implement wait-state generation, address decoding, and DMA handshake state machines in a single device. MultiVolt I/O lets the 3.3 V core interface with 5 V ISA slots, which is essential when retrofitting industrial PCs. Designers typically compile the bridge logic in Quartus II 13.0sp1 using VHDL or Verilog and program the device over JTAG. The main trade-off is that the MAX 7000A architecture has limited register count compared with modern FPGAs, so complex PCI target controllers may need to be partitioned across two devices.
Recommandé
Telecommunications Line-Card Control
In telecommunications line cards, the EPM7256AQC208-7 handles control-plane glue logic such as timeslot assignment, framer configuration, and alarm aggregation. Its 256 macrocells and 164 I/O pins can implement multiple independent state machines that monitor T1/E1 or SONET overhead bytes while simultaneously driving status LEDs and backplane control signals. The non-volatile EEPROM configuration ensures the line card reaches a known logic state immediately after power-up, avoiding the configuration latency of SRAM-based FPGAs during hot-swap events. The 7 ns speed grade supports the 125 MHz counter frequency needed for clock-divider chains in telecom timing trees. Because the device is NRND, new line-card designs should migrate to MAX 10 or a small FPGA, but existing deployed cards can continue to be repaired with this part. Thermal design should account for continuous operation in sealed telecom enclosures.
Recommandé
Test and Measurement Instrumentation
The EPM7256AQC208-7 is well suited to test and measurement instrumentation because its deterministic 7 ns pin-to-pin delay and 227.3 MHz internal toggle rate allow precise event sequencing and trigger generation. Instrument designers use the 256 macrocells to build programmable pulse generators, pattern generators, and digital capture state machines, while the 164 user I/O pins interface directly with front-panel connectors and ADC/DAC control buses. The EEPROM configuration means the instrument boots into a defined state without a configuration PROM, which simplifies field service. MultiVolt I/O supports both 5 V legacy instrumentation buses and 3.3 V modern logic on the same board. A practical limitation is that the MAX 7000A macrocell architecture is coarse-grained, so very deep capture buffers must be implemented in external memory rather than on-chip. The 208-pin PQFP package requires careful thermal relief on dense instrument PCBs.
Recommandé
Lighting Control Systems
The EPM7256AQC208-7 is used in lighting control systems, where it implements DMX512 and DALI protocol state machines, dimming PWM generation, and multi-channel relay sequencing. Its 164 user I/O pins can drive dozens of opto-isolated triac or relay channels directly, and the 256 macrocells provide enough registers to hold scene presets and fade tables. The non-volatile EEPROM configuration is a key advantage in lighting controllers because the system must resume its last lighting state immediately after a power interruption, without waiting for an external configuration device. The 3.0-3.6 V core with 5 V-tolerant I/O interfaces cleanly with legacy 5 V dimmer ballasts. Designers should note that the MAX 7000A family is NRND, so new lighting products should consider MAX 10 or a modern flash CPLD; existing installations can continue to be supported with this part.
Recommandé
Military and Aerospace Legacy Retrofit
The EPM7256AQC208-7 appears in military and aerospace retrofit programs where legacy 5 V logic must be consolidated without a full board redesign. Its 5 V-tolerant MultiVolt I/O and 3.3 V core allow direct replacement of discrete TTL glue logic while reducing board area and power. The 256 macrocells and 164 I/O pins support complex address decoding and bus arbitration for legacy avionics and ground-support equipment. EEPROM configuration provides instant-on operation and immunity to configuration loss during power transients, which is important in ruggedized environments. Because the commercial temperature grade is 0C to +70C, military users must verify that the enclosure maintains this range or select an industrial-temperature MAX 7000A variant. The part is NRND, so long-term support planning should include lifetime buys or a qualified drop-in alternative.
Recommandé
Récapitulatif des produits recommandés
Données de référence d'ingénierie pour EPM7256AQC208-7 — comparaison, recommandations de conception et informations de conformité.
Guide de sélection
Comparaison avec les alternatives
| Paramètre | Ce produit | EPM7256AQC208-7N | EPM7256AQC208-10 | EPM7256AQC208-10N | EPM7256AQC208-5 | EPM7256AQC208-15 | EPM7256AEQC208-7N |
|---|---|---|---|---|---|---|---|
| Package | 208-PQFP (28x28) | 208-PQFP (28x28) - same | 208-PQFP (28x28) - same | 208-PQFP (28x28) - same | 208-PQFP (28x28) - same | 208-PQFP (28x28) - same | 208-PQFP (28x28) - same |
| Brand | Altera | Altera | Altera | Altera | Altera | Altera | Altera |
| Macrocells | 256 | 256 | 256 | 256 | 256 | 256 | 256 |
| Usable Gates | 5,000 | 5,000 | 5,000 | 5,000 | 5,000 | 5,000 | 5,000 |
| Pin-to-Pin Delay (tPD) | 7 ns | 7 ns | 10 ns | 10 ns | 5 ns | 15 ns | 7 ns |
| Maximum Counter Frequency | 125 MHz | 125 MHz | ~100 MHz | ~100 MHz | ~147 MHz | ~83 MHz | 125 MHz |
| Supply Voltage - Internal | 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 | 3.0 V to 3.6 V |
| Speed Grade | -7 | -7 | -10 | -10 | -5 | -15 | -7 |
| Configuration Memory | EEPROM (non-volatile) | EEPROM (non-volatile) | EEPROM (non-volatile) | EEPROM (non-volatile) | EEPROM (non-volatile) | EEPROM (non-volatile) | EEPROM (non-volatile) |
Principaux différenciateurs
- Non-volatile EEPROM configuration with instant-on operation (vs EPM7256AQC208-10)
- Highest speed grade in the 208-pin PQFP MAX 7000A family (vs EPM7256AQC208-15)
- Lead-free option available with identical electrical performance (vs EPM7256AQC208-7N)
- High I/O density for bus consolidation (vs EPM7256AETC144-7)
Notes de conception
Decouple every VCCINT pin 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 MAX 7000A core draws transient current during macrocell switching; inadequate decoupling causes ground bounce that can corrupt EEPROM configuration during ISP. Estimated: at 3.3 V and 100 mA typical core current, a 0.1 uF cap supplies charge for roughly 3 ns of switching before the bulk capacitor responds, so do not omit the bulk capacitor even on lightly loaded boards.
Route the JTAG signals (TCK, TMS, TDI, TDO) as short, matched traces with a continuous ground reference and a 10 kOhm pull-up on TMS and a 10 kOhm pull-down on TCK to prevent accidental ISP entry during normal operation. Keep TCK below 10 MHz during in-system programming to stay within the MAX 7000A ISP timing specification. Place the JTAG header close to the device and avoid routing TCK parallel to high-speed I/O for more than 10 mm.
The 208-pin PQFP package dissipates power primarily through the leadframe and PCB copper. Estimated: at 3.3 V with 150 mA core current, the device dissipates approximately 0.5 W; with a typical PQFP theta_JA of about 40 C/W, junction temperature rises roughly 20 C above ambient. Provide a thermal pad or generous copper area under the device and avoid enclosing it in a sealed, unventilated region. Verify junction temperature against the datasheet maximum for the commercial 0C to +70C grade.
Do not attempt to compile MAX 7000A designs with Quartus II versions later than 13.0sp1 - support was removed and the device will not appear in the device list. Also confirm that the .pof programming file targets the correct speed grade; programming a -7 device with a -10 timing-optimized design is acceptable, but the reverse may violate timing. Always archive the exact Quartus II 13.0sp1 installation and device support files used for production programming.
When driving 5 V peripherals from the 3.3 V core through MultiVolt I/O, verify that the I/O bank VCCIO is set to the peripheral voltage and that series termination (typically 22 to 33 Ohm) is used on long traces exceeding 50 mm. Unterminated 5 V CMOS inputs can cause overshoot above the absolute maximum I/O rating. For bus interfaces above 50 MHz, keep stub lengths under 10 mm and reference all high-speed I/O to a solid ground plane.
Informations de conformité
Compliance data was not present in the verified web data for EPM7256AQC208-7. The -7N and -10N suffix variants are lead-free (Pb-free) per Altera naming convention, but this was not confirmed in the retrieved data. Verify RoHS/REACH status with the manufacturer or distributor before design release.
