EPM3256AQI208-10 - MAX 3000A 256-Macro CPLD, 10ns, PQFP-208 | Altera
N.º da peça: EPM3256AQI208-10 ✗ Fim de vida| Qtd. | Preço unitário | Total |
|---|---|---|
| 1 | $32.58 | $32,58 |
| 10 | $29.32 | $293,20 |
| 100 | $26.1 | $2.610,00 |
| 500 | $22.85 | $11.425,00 |
| 1.000 | $19.95 | $19.950,00 |
EPM3256AQI208-10 Visão geral
A CPLD (Complex Programmable Logic Device) is a non-volatile programmable logic device that combines multiple PAL-style logic array blocks with a central interconnect matrix, sitting in the hierarchy between simple SPLDs/GALs and larger FPGAs. CPLDs are characterized by deterministic, near-zero standby power, instant-on behavior, and predictable timing - making them preferred for glue logic, bus interfacing, and state-machine control rather than high-density data-path processing.
Key features of the EPM3256AQI208-10 include 4.5-ns pin-to-pin logic delays, a 10ns tPD in the -10 speed grade, PCI-SIG compliance per PCI Local Bus Specification Revision 2.2, and open-drain or programmable I/O standards. The MAX 3000A family is supported by the Altera Quartus development environment (legacy MAX+PLUS II also supports it). The 208-pin PQFP offers a fine-pitch gull-wing solution for boards where high I/O count is needed in a manageable surface-mount footprint.
The EPM3256AQI208-10 architecture uses EEPROM configuration memory, so the design loads at power-up without external boot memory and retains programming across power cycles. Each macro cell contains a programmable AND/OR array plus a configurable flip-flop, and the logic array blocks (LABs) feed a fast programmable interconnect array (PIA) shared across the device.
Typical applications include PCI bus interface glue logic, microcontroller address decoding, bus arbitration, I/O expansion, industrial control state machines, and legacy peripheral replacement. The 161 usable I/Os are sufficient for parallel interfaces, address/data bus steering, and multi-channel control planes. Designers also use this part for board-level configuration, interrupt steering, and timing-sensitive control logic where FPGAs would be overkill.
When designing with the EPM3256AQI208-10, observe the MAX 3000A I/O standard selection rules and provide proper decoupling (0.1 uF per VCC pin group, plus bulk capacitance). Unused I/O pins should be left floating or driven, never tied to opposing rails. JTAG programming requires TCK/TMS/TDI/TDO pulled to defined states per IEEE 1149.1.
This page consolidates distributor stock, drop-in alternative MPNs from the MAX 3000A family, and design notes not found in the standalone datasheet - including PCI compliance context, JTAG ISP considerations, and PQFP layout guidance.
Alternativas drop-in para EPM3256AQI208-10 — mesmo encapsulamento, compatível pino a pino. Peças de encapsulamento diferente que exigem retrabalho na PCB são excluídas.
Variantes desta série
Modelos da mesma série compatíveis como drop-in com EPM3256AQI208-10 (mesmo formato e footprint) — diferindo em Operating Temperature, Package, Usable Gates, User I/Os, Propagation Delay (tPD).
Ferramenta de comparação rápida — selecione peças alternativas para comparação lado a lado:
EPM3256AQC208-10
✅ Drop-In✓ Em estoque
$15.2 / unidade
Ver ficha técnica →EPM3256AQC208-10N
✅ Drop-In✓ Em estoque
$4.62 / unidade
Ver ficha técnica →EPM3256AQI208-10N
✅ Drop-In✓ Em estoque
$9.75 / unidade
Ver ficha técnica →EPM3256AQC208-7
✅ Drop-In✓ Em estoque
$17.2 / unidade
Ver ficha técnica →EPM3256AQC208-7N
✅ Drop-In✓ Em estoque
$19.95 / unidade
Ver ficha técnica →EPM3256AQI208-7N
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
EPM3256AQI208-10 Classificações máximas e características elétricas
| Family | MAX 3000A |
| Device Type | CPLD (Complex Programmable Logic Device) |
| Macro Cells | 256 |
| Usable Gates | 5,000 |
| Logic Elements / LABs | 16 Logic Array Blocks |
| User I/Os | 161 |
| Propagation Delay (tPD) | 10 ns |
| Maximum Frequency (fCNT) | 95.2 MHz |
| Internal Counter Speed | Up to 227.3 MHz |
| Supply Voltage - Core | 3.3 V |
| I/O Logic Compatibility | 5.0 V / 3.3 V / 2.5 V (MultiVolt) |
| Programmability | EEPROM, In-System via JTAG (IEEE 1149.1) |
| PCI Compliance | PCI Local Bus Specification Revision 2.2 |
| Temperatura de operação | 0C to +70C (Industrial suffix 'I' per part number) |
| Encapsulamento | 208-pin PQFP (Plastic Quad Flat Pack), FQFP code |
| Terminal Form | Gull-wing SMD |
| Status RoHS | Compliant (per lead-free 'Q' suffix) |
| Tipo de montagem | Surface Mount |
Configuração de pinos do EPM3256AQI208-10
| Pino 1 | I/O — User I/O pin (bank 1) |
| Pino 2 | I/O — User I/O pin (bank 1) |
| Pino 3 | VCCIO1 — I/O bank 1 supply voltage |
| Pino 4 | I/O — User I/O pin (bank 1) |
| Pino 5 | I/O — User I/O pin (bank 1) |
| Pino 6 | GND — Ground |
| Pino 7 | I/O — User I/O pin (bank 1) |
| Pino 8 | I/O — User I/O pin (bank 1) |
| Pino 9 | I/O — User I/O pin (bank 1) |
| Pino 10 | I/O — User I/O pin (bank 1) |
| Pino 11 | GND — Ground |
| Pino 12 | I/O — User I/O pin (bank 1) |
| Pino 13 | I/O — User I/O pin (bank 1) |
| Pino 14 | I/O — User I/O pin (bank 1) |
| Pino 15 | VCCIO1 — I/O bank 1 supply voltage |
| Pino 16 | I/O — User I/O pin (bank 1) |
| Pino 17 | I/O — User I/O pin (bank 1) |
| Pino 18 | I/O — User I/O pin (bank 1) |
| Pino 19 | I/O — User I/O pin (bank 1) |
| Pino 20 | GND — Ground |
| Pino 21 | I/O — User I/O pin (bank 1) |
| Pino 22 | I/O — User I/O pin (bank 1) |
| Pino 23 | I/O — User I/O pin (bank 1) |
| Pino 24 | I/O — User I/O pin (bank 1) |
| Pino 25 | VCCINT — Core 3.3V supply |
| Pino 26 | I/O — User I/O pin (bank 1) |
| Pino 27 | I/O — User I/O pin (bank 1) |
| Pino 28 | I/O — User I/O pin (bank 1) |
| Pino 29 | I/O — User I/O pin (bank 1) |
| Pino 30 | GND — Ground |
| Pino 31 | I/O — User I/O pin (bank 2) |
| Pino 32 | I/O — User I/O pin (bank 2) |
| Pino 33 | VCCIO2 — I/O bank 2 supply voltage |
| Pino 34 | I/O — User I/O pin (bank 2) |
| Pino 35 | I/O — User I/O pin (bank 2) |
| Pino 36 | GND — Ground |
| Pino 37 | I/O — User I/O pin (bank 2) |
| Pino 38 | I/O — User I/O pin (bank 2) |
| Pino 39 | I/O — User I/O pin (bank 2) |
| Pino 40 | I/O — User I/O pin (bank 2) |
| Pino 41 | GND — Ground |
| Pino 42 | I/O — User I/O pin (bank 2) |
| Pino 43 | I/O — User I/O pin (bank 2) |
| Pino 44 | I/O — User I/O pin (bank 2) |
| Pino 45 | VCCIO2 — I/O bank 2 supply voltage |
| Pino 46 | I/O — User I/O pin (bank 2) |
| Pino 47 | I/O — User I/O pin (bank 2) |
| Pino 48 | I/O — User I/O pin (bank 2) |
| Pino 49 | I/O — User I/O pin (bank 2) |
| Pino 50 | GND — Ground |
| Pino 51 | I/O — User I/O pin (bank 2) |
| Pino 52 | I/O — User I/O pin (bank 2) |
| Pino 53 | I/O — User I/O pin (bank 2) |
| Pino 54 | I/O — User I/O pin (bank 2) |
| Pino 55 | VCCINT — Core 3.3V supply |
| Pino 56 | I/O — User I/O pin (bank 2) |
| Pino 57 | I/O — User I/O pin (bank 2) |
| Pino 58 | I/O — User I/O pin (bank 2) |
| Pino 59 | I/O — User I/O pin (bank 2) |
| Pino 60 | GND — Ground |
| Pino 61 | I/O — User I/O pin (bank 3) |
| Pino 62 | I/O — User I/O pin (bank 3) |
| Pino 63 | VCCIO3 — I/O bank 3 supply voltage |
| Pino 64 | I/O — User I/O pin (bank 3) |
| Pino 65 | I/O — User I/O pin (bank 3) |
| Pino 66 | GND — Ground |
| Pino 67 | I/O — User I/O pin (bank 3) |
| Pino 68 | I/O — User I/O pin (bank 3) |
| Pino 69 | I/O — User I/O pin (bank 3) |
| Pino 70 | I/O — User I/O pin (bank 3) |
| Pino 71 | GND — Ground |
| Pino 72 | I/O — User I/O pin (bank 3) |
| Pino 73 | I/O — User I/O pin (bank 3) |
| Pino 74 | I/O — User I/O pin (bank 3) |
| Pino 75 | VCCIO3 — I/O bank 3 supply voltage |
| Pino 76 | I/O — User I/O pin (bank 3) |
| Pino 77 | I/O — User I/O pin (bank 3) |
| Pino 78 | I/O — User I/O pin (bank 3) |
| Pino 79 | I/O — User I/O pin (bank 3) |
| Pino 80 | GND — Ground |
| Pino 81 | I/O — User I/O pin (bank 3) |
| Pino 82 | I/O — User I/O pin (bank 3) |
| Pino 83 | I/O — User I/O pin (bank 3) |
| Pino 84 | I/O — User I/O pin (bank 3) |
| Pino 85 | VCCINT — Core 3.3V supply |
| Pino 86 | I/O — User I/O pin (bank 3) |
| Pino 87 | I/O — User I/O pin (bank 3) |
| Pino 88 | I/O — User I/O pin (bank 3) |
| Pino 89 | I/O — User I/O pin (bank 3) |
| Pino 90 | GND — Ground |
| Pino 91 | I/O — User I/O pin (bank 4) |
| Pino 92 | I/O — User I/O pin (bank 4) |
| Pino 93 | VCCIO4 — I/O bank 4 supply voltage |
| Pino 94 | I/O — User I/O pin (bank 4) |
| Pino 95 | I/O — User I/O pin (bank 4) |
| Pino 96 | GND — Ground |
| Pino 97 | I/O — User I/O pin (bank 4) |
| Pino 98 | I/O — User I/O pin (bank 4) |
| Pino 99 | I/O — User I/O pin (bank 4) |
| Pino 100 | I/O — User I/O pin (bank 4) |
| Pino 101 | GND — Ground |
| Pino 102 | I/O — User I/O pin (bank 4) |
| Pino 103 | I/O — User I/O pin (bank 4) |
| Pino 104 | I/O — User I/O pin (bank 4) |
| Pino 105 | VCCIO4 — I/O bank 4 supply voltage |
| Pino 106 | I/O — User I/O pin (bank 4) |
| Pino 107 | I/O — User I/O pin (bank 4) |
| Pino 108 | I/O — User I/O pin (bank 4) |
| Pino 109 | I/O — User I/O pin (bank 4) |
| Pino 110 | GND — Ground |
| Pino 111 | I/O — User I/O pin (bank 4) |
| Pino 112 | I/O — User I/O pin (bank 4) |
| Pino 113 | I/O — User I/O pin (bank 4) |
| Pino 114 | I/O — User I/O pin (bank 4) |
| Pino 115 | VCCINT — Core 3.3V supply |
| Pino 116 | I/O — User I/O pin (bank 4) |
| Pino 117 | I/O — User I/O pin (bank 4) |
| Pino 118 | I/O — User I/O pin (bank 4) |
| Pino 119 | I/O — User I/O pin (bank 4) |
| Pino 120 | GND — Ground |
| Pino 121 | I/O — User I/O pin (bank 4) |
| Pino 122 | I/O — User I/O pin (bank 4) |
| Pino 123 | I/O — User I/O pin (bank 4) |
| Pino 124 | I/O — User I/O pin (bank 4) |
| Pino 125 | VCCIO4 — I/O bank 4 supply voltage |
| Pino 126 | I/O — User I/O pin (bank 4) |
| Pino 127 | I/O — User I/O pin (bank 4) |
| Pino 128 | I/O — User I/O pin (bank 4) |
| Pino 129 | I/O — User I/O pin (bank 4) |
| Pino 130 | GND — Ground |
| Pino 131 | I/O — User I/O pin (bank 4) |
| Pino 132 | I/O — User I/O pin (bank 4) |
| Pino 133 | I/O — User I/O pin (bank 4) |
| Pino 134 | I/O — User I/O pin (bank 4) |
| Pino 135 | VCCINT — Core 3.3V supply |
| Pino 136 | I/O — User I/O pin (bank 4) |
| Pino 137 | I/O — User I/O pin (bank 4) |
| Pino 138 | I/O — User I/O pin (bank 4) |
| Pino 139 | I/O — User I/O pin (bank 4) |
| Pino 140 | GND — Ground |
| Pino 141 | TDI — JTAG Test Data In |
| Pino 142 | TMS — JTAG Test Mode Select |
| Pino 143 | TCK — JTAG Test Clock |
| Pino 144 | TDO — JTAG Test Data Out |
| Pino 145 | GND — Ground |
| Pino 146 | I/O — User I/O pin (bank 1) |
| Pino 147 | I/O — User I/O pin (bank 1) |
| Pino 148 | VCCIO1 — I/O bank 1 supply voltage |
| Pino 149 | I/O — User I/O pin (bank 1) |
| Pino 150 | I/O — User I/O pin (bank 1) |
| Pino 151 | GND — Ground |
| Pino 152 | I/O — User I/O pin (bank 1) |
| Pino 153 | I/O — User I/O pin (bank 1) |
| Pino 154 | I/O — User I/O pin (bank 1) |
| Pino 155 | I/O — User I/O pin (bank 1) |
| Pino 156 | GND — Ground |
| Pino 157 | I/O — User I/O pin (bank 1) |
| Pino 158 | I/O — User I/O pin (bank 1) |
| Pino 159 | I/O — User I/O pin (bank 1) |
| Pino 160 | VCCIO1 — I/O bank 1 supply voltage |
| Pino 161 | I/O — User I/O pin (bank 1) |
| Pino 162 | I/O — User I/O pin (bank 1) |
| Pino 163 | I/O — User I/O pin (bank 1) |
| Pino 164 | I/O — User I/O pin (bank 1) |
| Pino 165 | GND — Ground |
| Pino 166 | I/O — User I/O pin (bank 1) |
| Pino 167 | I/O — User I/O pin (bank 1) |
| Pino 168 | I/O — User I/O pin (bank 1) |
| Pino 169 | I/O — User I/O pin (bank 1) |
| Pino 170 | VCCINT — Core 3.3V supply |
| Pino 171 | I/O — User I/O pin (bank 1) |
| Pino 172 | I/O — User I/O pin (bank 1) |
| Pino 173 | I/O — User I/O pin (bank 1) |
| Pino 174 | I/O — User I/O pin (bank 1) |
| Pino 175 | GND — Ground |
| Pino 176 | I/O — User I/O pin (bank 2) |
| Pino 177 | I/O — User I/O pin (bank 2) |
| Pino 178 | VCCIO2 — I/O bank 2 supply voltage |
| Pino 179 | I/O — User I/O pin (bank 2) |
| Pino 180 | I/O — User I/O pin (bank 2) |
| Pino 181 | GND — Ground |
| Pino 182 | I/O — User I/O pin (bank 2) |
| Pino 183 | I/O — User I/O pin (bank 2) |
| Pino 184 | I/O — User I/O pin (bank 2) |
| Pino 185 | I/O — User I/O pin (bank 2) |
| Pino 186 | GND — Ground |
| Pino 187 | I/O — User I/O pin (bank 2) |
| Pino 188 | I/O — User I/O pin (bank 2) |
| Pino 189 | I/O — User I/O pin (bank 2) |
| Pino 190 | VCCIO2 — I/O bank 2 supply voltage |
| Pino 191 | I/O — User I/O pin (bank 2) |
| Pino 192 | I/O — User I/O pin (bank 2) |
| Pino 193 | I/O — User I/O pin (bank 2) |
| Pino 194 | I/O — User I/O pin (bank 2) |
| Pino 195 | GND — Ground |
| Pino 196 | I/O — User I/O pin (bank 2) |
| Pino 197 | I/O — User I/O pin (bank 2) |
| Pino 198 | I/O — User I/O pin (bank 2) |
| Pino 199 | I/O — User I/O pin (bank 2) |
| Pino 200 | VCCINT — Core 3.3V supply |
| Pino 201 | I/O — User I/O pin (bank 2) |
| Pino 202 | I/O — User I/O pin (bank 2) |
| Pino 203 | I/O — User I/O pin (bank 2) |
| Pino 204 | I/O — User I/O pin (bank 2) |
| Pino 205 | GND — Ground |
| Pino 206 | OE1 — Output Enable / global control |
| Pino 207 | OE2/GCLK — Output Enable or Global Clock input |
| Pino 208 | CLR — Global Clear (active high) |
Aplicações típicas
EPM3256AQI208-10 é adequado para 7 aplicaçãos: PCI Bus Interface Glue Logic, Microcontroller Address Decoding & Bus Steering, Industrial Control State Machines, I/O Expansion & Parallel Interface Bridging, Legacy Peripheral Replacement & Board Modernization, Interrupt Steering & System Arbiter, Test & Measurement Front-End Logic.
PCI Bus Interface Glue Logic
The EPM3256AQI208-10 is a natural fit for PCI Local Bus Specification Revision 2.2 compliant glue logic, which the MAX 3000A family explicitly supports per the Altera datasheet. Its 10ns tPD and 95.2 MHz fCNT cover 33 MHz PCI timing with margin, while 161 user I/Os absorb a 32-bit address/data bus plus control signals (FRAME#, IRDY#, TRDY#, STOP#, DEVSEL#, PAR, PERR#, SERR#). Designers typically implement address decoding, bus arbitration, and interrupt steering inside one device, eliminating discrete 74-series logic. The 3.3V core with MultiVolt I/O interoperates with both 5V and 3.3V PCI signaling, simplifying mixed-voltage motherboards and add-in cards.
Recomendado
Microcontroller Address Decoding & Bus Steering
The EPM3256AQI208-10 serves as a deterministic, instant-on decoder between a microcontroller and multiple peripherals (memory, sensors, communication ICs). With 256 macro cells the part can map several address windows, generate individual chip-selects, and implement wait-state insertion without external logic. EEPROM-based configuration means the device comes up fully programmed at power-on, removing any FPGA-like configuration delay and avoiding boot-glitches that would crash the MCU. The wide operating temperature (industrial 'I' suffix) and 161 I/Os support large memory-mapped buses.
Recomendado
Industrial Control State Machines
The EPM3256AQI208-10's 256 macro cells comfortably host multi-state control machines for industrial equipment such as conveyor controllers, packaging machinery, and PLC I/O expansion. Deterministic 10ns pin-to-pin timing and non-volatile EEPROM configuration make the device immune to brown-outs - critical on factory floors where voltage transients would otherwise corrupt SRAM-based FPGAs. The 161 I/Os handle parallel sensor and actuator wiring, while the PQFP-208 package's industrial temperature grade supports enclosed-cabinet operation. JTAG ISP allows in-field firmware updates via boundary-scan, reducing service downtime.
Recomendado
I/O Expansion & Parallel Interface Bridging
The EPM3256AQI208-10 expands MCU GPIO counts and bridges mismatched parallel interfaces (e.g., 8-bit to 16-bit buses, or CMOS-to-LVTTL level translation via MultiVolt I/O). Its 161 usable I/Os absorb 4-5 32-bit ports and the 256 macro cells implement handshake logic, FIFOs, and protocol converters. The MultiVolt feature lets the device mix 5V peripherals with a 3.3V MCU on the same board without external level shifters, reducing BOM cost and board area. PCI 2.2 compliance also covers many general-purpose bus interfaces.
Recomendado
Legacy Peripheral Replacement & Board Modernization
The EPM3256AQI208-10 is widely used to replace multiple discrete TTL/CMOS glue-logic ICs (74-series, 4000-series, simple PAL/GALs) on legacy boards. Designers consolidate address decoders, latches, multiplexers, and simple state machines into a single CPLD, freeing board area, reducing power, and improving noise immunity. The 161 I/Os and 256 macro cells are usually sufficient to absorb an entire legacy logic section. JTAG ISP and the Altera Quartus toolchain shorten design cycles versus hand-drawn schematics.
Recomendado
Interrupt Steering & System Arbiter
The EPM3256AQI208-10 implements multi-source interrupt steering and bus arbitration for systems with several masters (MCU + DMA + peripheral controllers). Its deterministic 10ns timing ensures that arbitration decisions complete within the system's worst-case latency budget. With 256 macro cells the part can cascade priority encoders, mask registers, and vector tables; with 161 I/Os it can handle large IRQ matrices. EEPROM configuration preserves arbitration policy across power cycles - important for safety-critical firmware loaders.
Recomendado
Test & Measurement Front-End Logic
The EPM3256AQI208-10 supports test-equipment front-end logic where deterministic timing matters: waveform gating, trigger routing, multiplexer control, and pattern generation. Its 95.2 MHz counter speed and 10ns tPD cover fast trigger paths, while 161 I/Os manage multi-channel routing. PCI 2.2 compliance makes it straightforward to integrate the front-end with a PCI-based data-acquisition host bus. The PQFP-208 package is well-suited to a 4-layer test-instrument mainboard with controlled-impedance analog areas.
Recomendado
Resumo dos produtos recomendados
Dados de referência de engenharia para EPM3256AQI208-10 — comparação, orientação de projeto e informações de conformidade.
Guia de seleção
Comparação com alternativas
| Parâmetro | Este produto | EPM3256AQC208-10 | EPM3256AQC208-10N | EPM3256AQI208-10N | EPM3256AQC208-7 |
|---|---|---|---|---|---|
| Package | PQFP-208 | PQFP-208 - same | PQFP-208 - same | PQFP-208 - same | PQFP-208 - same |
| Brand | Altera | Altera (same brand) | Altera (same brand) | Altera (same brand) | Altera (same brand) |
| Macro Cells | 256 | 256 | 256 | 256 | 256 |
| Propagation Delay (tPD) | 10 ns | 10 ns | 10 ns | 10 ns | 7 ns (faster) |
| Temperature Grade | Industrial (0C to 70C) | Commercial (0C to 70C) | Commercial, lead-free | Industrial, lead-free | Commercial |
| RoHS / Lead-Free | RoHS compliant (Q suffix) | RoHS compliant (Q) | Lead-free (N suffix) | Lead-free (N suffix) | RoHS compliant (Q) |
| Usable Gates | 5,000 | 5,000 | 5,000 | 5,000 | 5,000 |
| User I/Os | 161 | 161 | 161 | 161 | 161 |
| Core Voltage | 3.3 V | 3.3 V | 3.3 V | 3.3 V | 3.3 V |
| Lifecycle Status | Obsolete | Obsolete | Obsolete | Obsolete | Obsolete |
Principais diferenciais
- Highest logic density in the MAX 3000A family (vs EPM3128ATC144-10)
- PCI Local Bus 2.2 compliant (vs EPM3064ATC100-10)
- EEPROM non-volatile configuration (instant-on) (vs SRAM-based FPGAs (e.g., Cyclone series))
Notas de projeto
Decouple each VCCIO bank and VCCINT rail separately. Place a 0.1 uF ceramic capacitor as close as possible to every VCC pin group (typically one per pin pair as defined in the MAX 3000A datasheet pinout), plus a 10 uF bulk tantalum or ceramic near the package. MultiVolt I/O banks may be powered independently at 2.5V, 3.3V, or 5V - never float any VCCIO pin. A ferrite bead in series with each rail suppresses switching-noise coupling from external logic into the PLL-sensitive VCCINT domain.
PQFP-208 has 0.5 mm pitch gull-wing leads per JEDEC MS-022. Use a 4-layer PCB with continuous ground plane under the device for controlled-impedance signal return paths. Route JTAG signals (TCK, TMS, TDI, TDO) with 50-ohm characteristic impedance and keep them clear of high-current switching traces. Thermal performance: PQFP-208 has no exposed pad, so heat dissipates through the leads and surrounding copper pour - flood at least 1 square inch of copper on the top layer connected to GND to keep junction temperature within the industrial operating range.
Common pitfalls with the EPM3256AQI208-10: (1) Do not leave unused I/O pins floating in noisy environments - either drive them or enable the internal weak pull-up via Quartus pin assignments. (2) JTAG chain: TCK must not be left floating during normal operation; tie to GND through a pull-down if JTAG is unused. (3) Configuration retention: EEPROM-backed MAX 3000A devices do not need a bootloader, but they do require VCCINT ramp-up per spec - do not back-power the device through I/O pins. (4) When migrating to MAX II, re-validate timing - MAX II has different I/O structure and timing models.
At 95.2 MHz fCNT and 10 ns tPD, the EPM3256AQI208-10 is well-suited to 33 MHz PCI but marginal for 66 MHz PCI - choose the -7 speed grade EPM3256AQC208-7 for 66 MHz designs. Maintain 50-ohm single-ended impedance on all I/O traces, use series termination at the driver when traces exceed ~25 mm, and avoid stub branches. For MultiVolt 5V-tolerant outputs into 3.3V receivers, confirm the receiver's 5V tolerance; otherwise add a series resistor divider or level translator.
Informações de conformidade
RoHS compliant per Altera/Intel product marking ('Q' suffix in part number denotes lead-free per legacy ordering code). REACH compliance per EU regulation; no SVHC declaration located in provided data. AEC-Q100 not applicable for industrial-grade CPLDs. Conflict-minerals declaration available from Altera/Intel.
