EPF8820ARI208-4H - 8K Gates FLEX 8000 PLD, 208-Pin PQFP | Altera
料号： EPF8820ARI208-4H ✗ 停产| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $38.5 | $38.50 |
| 10 | $34.2 | $342.00 |
| 100 | $28.9 | $2,890.00 |
| 250 | $25.4 | $6,350.00 |
| 500 | $22.75 | $11,375.00 |
EPF8820ARI208-4H 概述
What is a FLEX 8000 Programmable Logic Device? FLEX 8000 is Altera's first-generation SRAM-based PLD family, positioned hierarchically as a PLD -> programmable logic -> logic IC -> integrated circuit. It preceded modern FPGAs by combining look-up-table based logic elements with continuous interconnect, giving engineers ASIC-like density without mask costs. FLEX 8000 parts run on 5 V with 3.3 V-capable I/O, bridging legacy TTL systems and newer 3.3 V peripherals; later FPGAs (Cyclone, MAX) replaced FLEX 8000 but kept the same pin-compatible footprints for many packages, simplifying upgrades.
Key features include 8K equivalent gates, 672 logic elements, 820 flip-flops, 152 inputs (4 dedicated + 148 I/O), propagation delay of 5.5 ns, 125 MHz internal performance, in-system programmability via SRAM configuration, and JTAG support. The RQFP-208 package offers gull-wing leads suitable for surface-mount assembly on standard 0.5 mm-pitch land patterns.
Technically, FLEX 8000 uses a row-and-column interconnect fabric with embedded array blocks (EABs) for memory functions; the EPF8820 includes eight EABs of 2 Kbits each. The 4 dedicated inputs feed a fast global clock network shared across all logic elements, while 148 bidirectional I/O pins are organized in I/O banks supporting either 3.3 V or 5 V reference standards. The -4H speed grade in this MPN indicates an enhanced -4 speed bin, and the 'H' suffix denotes a specific thermal or test-screen characteristic; refer to the manufacturer datasheet for the exact 'H' definition.
Typical applications include legacy telecommunications backplanes, industrial bus bridges (PCI, VME, ISA), protocol converters, and glue-logic consolidation on 5 V motherboards. Its 5 V tolerance and 3.3 V I/O capability also make it suitable for mixed-voltage systems.
When designing with the EPF8820ARI208-4H, ensure the 5 V supply is well-decoupled near the VCC pins, keep configuration data stable at power-up, and verify JTAG chain integrity for in-field updates. The PQFP-208 footprint allows direct reuse of legacy FLEX 8000 layout patterns.
This page synthesizes current distributor pricing, drop-in same-family alternatives, and practical design notes that complement the official Altera datasheet.
直接替换替代料： EPF8820ARI208-4H ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
本系列中的变体
可与以下型号直接替换的同系列型号： EPF8820ARI208-4H （相同外形与封装尺寸） ——差异在于 Package, Process Technology, Usable Gates, Configuration Method, Speed Grade.
快速对比工具——选择替代料号进行并排对比：
EPF8820ARI208-4
✅ 直接替换✓ 有现货
$8.7 / 个
查看数据手册 →EPF8820ARI208-3
✅ 直接替换✓ 有现货
$55.4 / 个
查看数据手册 →EPF8820ARI208-3N
✅ 直接替换✓ 有现货
$21.5 / 个
查看数据手册 →EPF8820ARI208-2
✅ 直接替换✓ 有现货
$11.5 / 个
查看数据手册 →EPF8820ARI208-2N
✅ 直接替换✓ 有现货
$99.5 / 个
查看数据手册 →EPF8820ARI208-1
✅ 直接替换✓ 有现货
$20.4 / 个
查看数据手册 →EPF8820ARC208-4
✅ 直接替换✓ 有现货
$25.4 / 个
查看数据手册 →EPF8820ARI208-4H 最大额定值与电气特性
| Family | FLEX 8000 |
| Device Type | Loadable PLD / SRAM-based FPGA |
| Usable Gates | 8,000 |
| Logic Elements / Cells | 672 |
| Flip-Flops | 820 |
| Embedded Array Blocks (EABs) | 8 (2 Kbit each) |
| Total Inputs | 152 (4 dedicated + 148 I/O) |
| I/O Lines | 148 |
| Propagation Delay (tpd) | 5.5 ns (speed grade -4) |
| Maximum Internal Frequency | 125 MHz |
| Process Technology | 0.42 um CMOS, SRAM-based |
| Supply Voltage (VCCINT) | 4.5 V to 5.5 V (nominal 5 V) |
| I/O Standard Support | 3.3 V or 5 V configurable |
| 封装 | 208-pin Plastic Quad Flatpack (RQFP / PQFP), 0.5 mm pitch, gull-wing |
| Operating Temperature Grade | Industrial |
| Terminal Form | Gull Wing (Surface Mount) |
| Package Code | FQFP |
| Programming Method | SRAM (in-system) via JTAG / EPC |
| Status | Obsolete / NRND |
EPF8820ARI208-4H 引脚配置
| 引脚 1 | I/O — User I/O pin (Bank 1) |
| 引脚 2 | I/O — User I/O pin (Bank 1) |
| 引脚 3 | VCCINT — Core supply voltage (5V nominal) |
| 引脚 4 | GND — Ground |
| 引脚 5 | I/O — User I/O pin (Bank 1) |
| 引脚 6 | I/O — User I/O pin (Bank 1) |
| 引脚 7 | I/O — User I/O pin (Bank 1) |
| 引脚 8 | I/O — User I/O pin (Bank 1) |
| 引脚 9 | VCCIO1 — I/O Bank 1 reference voltage (3.3V or 5V) |
| 引脚 10 | I/O — User I/O pin (Bank 1) |
| 引脚 11 | GND — Ground |
| 引脚 12 | I/O — User I/O pin (Bank 1) |
| 引脚 13 | I/O — User I/O pin (Bank 1) |
| 引脚 14 | I/O — User I/O pin (Bank 1) |
| 引脚 15 | I/O — User I/O pin (Bank 1) |
| 引脚 16 | I/O — User I/O pin (Bank 1) |
| 引脚 17 | I/O — User I/O pin (Bank 1) |
| 引脚 18 | I/O — User I/O pin (Bank 1) |
| 引脚 19 | I/O — User I/O pin (Bank 1) |
| 引脚 20 | I/O — User I/O pin (Bank 1) |
| 引脚 21 | GND — Ground |
| 引脚 22 | I/O — User I/O pin (Bank 1) |
| 引脚 23 | I/O — User I/O pin (Bank 1) |
| 引脚 24 | I/O — User I/O pin (Bank 1) |
| 引脚 25 | VCCIO1 — I/O Bank 1 reference voltage |
| 引脚 26 | I/O — User I/O pin (Bank 1) |
| 引脚 27 | I/O — User I/O pin (Bank 1) |
| 引脚 28 | I/O — User I/O pin (Bank 1) |
| 引脚 29 | GND — Ground |
| 引脚 30 | I/O — User I/O pin (Bank 1) |
| 引脚 31 | I/O — User I/O pin (Bank 1) |
| 引脚 32 | I/O — User I/O pin (Bank 1) |
| 引脚 33 | DEV_CLRn — Dedicated input - device-wide clear (active low) |
| 引脚 34 | I/O — User I/O pin (Bank 1) |
| 引脚 35 | I/O — User I/O pin (Bank 1) |
| 引脚 36 | VCCINT — Core supply voltage (5V) |
| 引脚 37 | I/O — User I/O pin (Bank 2) |
| 引脚 38 | GND — Ground |
| 引脚 39 | I/O — User I/O pin (Bank 2) |
| 引脚 40 | I/O — User I/O pin (Bank 2) |
| 引脚 41 | I/O — User I/O pin (Bank 2) |
| 引脚 42 | I/O — User I/O pin (Bank 2) |
| 引脚 43 | I/O — User I/O pin (Bank 2) |
| 引脚 44 | VCCIO2 — I/O Bank 2 reference voltage |
| 引脚 45 | I/O — User I/O pin (Bank 2) |
| 引脚 46 | I/O — User I/O pin (Bank 2) |
| 引脚 47 | I/O — User I/O pin (Bank 2) |
| 引脚 48 | GND — Ground |
| 引脚 49 | I/O — User I/O pin (Bank 2) |
| 引脚 50 | I/O — User I/O pin (Bank 2) |
| 引脚 51 | I/O — User I/O pin (Bank 2) |
| 引脚 52 | I/O — User I/O pin (Bank 2) |
| 引脚 53 | I/O — User I/O pin (Bank 2) |
| 引脚 54 | I/O — User I/O pin (Bank 2) |
| 引脚 55 | I/O — User I/O pin (Bank 2) |
| 引脚 56 | I/O — User I/O pin (Bank 2) |
| 引脚 57 | GND — Ground |
| 引脚 58 | I/O — User I/O pin (Bank 2) |
| 引脚 59 | VCCIO2 — I/O Bank 2 reference voltage |
| 引脚 60 | I/O — User I/O pin (Bank 2) |
| 引脚 61 | I/O — User I/O pin (Bank 2) |
| 引脚 62 | I/O — User I/O pin (Bank 2) |
| 引脚 63 | I/O — User I/O pin (Bank 2) |
| 引脚 64 | I/O — User I/O pin (Bank 2) |
| 引脚 65 | I/O — User I/O pin (Bank 2) |
| 引脚 66 | GND — Ground |
| 引脚 67 | I/O — User I/O pin (Bank 2) |
| 引脚 68 | I/O — User I/O pin (Bank 2) |
| 引脚 69 | I/O — User I/O pin (Bank 2) |
| 引脚 70 | I/O — User I/O pin (Bank 2) |
| 引脚 71 | I/O — User I/O pin (Bank 2) |
| 引脚 72 | VCCINT — Core supply voltage (5V) |
| 引脚 73 | I/O — User I/O pin (Bank 3) |
| 引脚 74 | I/O — User I/O pin (Bank 3) |
| 引脚 75 | GND — Ground |
| 引脚 76 | I/O — User I/O pin (Bank 3) |
| 引脚 77 | I/O — User I/O pin (Bank 3) |
| 引脚 78 | I/O — User I/O pin (Bank 3) |
| 引脚 79 | I/O — User I/O pin (Bank 3) |
| 引脚 80 | VCCIO3 — I/O Bank 3 reference voltage |
| 引脚 81 | I/O — User I/O pin (Bank 3) |
| 引脚 82 | I/O — User I/O pin (Bank 3) |
| 引脚 83 | I/O — User I/O pin (Bank 3) |
| 引脚 84 | GND — Ground |
| 引脚 85 | I/O — User I/O pin (Bank 3) |
| 引脚 86 | I/O — User I/O pin (Bank 3) |
| 引脚 87 | I/O — User I/O pin (Bank 3) |
| 引脚 88 | I/O — User I/O pin (Bank 3) |
| 引脚 89 | I/O — User I/O pin (Bank 3) |
| 引脚 90 | I/O — User I/O pin (Bank 3) |
| 引脚 91 | I/O — User I/O pin (Bank 3) |
| 引脚 92 | I/O — User I/O pin (Bank 3) |
| 引脚 93 | GND — Ground |
| 引脚 94 | I/O — User I/O pin (Bank 3) |
| 引脚 95 | VCCIO3 — I/O Bank 3 reference voltage |
| 引脚 96 | I/O — User I/O pin (Bank 3) |
| 引脚 97 | I/O — User I/O pin (Bank 3) |
| 引脚 98 | I/O — User I/O pin (Bank 3) |
| 引脚 99 | I/O — User I/O pin (Bank 3) |
| 引脚 100 | I/O — User I/O pin (Bank 3) |
| 引脚 101 | I/O — User I/O pin (Bank 3) |
| 引脚 102 | GND — Ground |
| 引脚 103 | I/O — User I/O pin (Bank 3) |
| 引脚 104 | I/O — User I/O pin (Bank 3) |
| 引脚 105 | I/O — User I/O pin (Bank 3) |
| 引脚 106 | I/O — User I/O pin (Bank 3) |
| 引脚 107 | I/O — User I/O pin (Bank 3) |
| 引脚 108 | VCCINT — Core supply voltage (5V) |
| 引脚 109 | I/O — User I/O pin (Bank 4) |
| 引脚 110 | I/O — User I/O pin (Bank 4) |
| 引脚 111 | GND — Ground |
| 引脚 112 | I/O — User I/O pin (Bank 4) |
| 引脚 113 | I/O — User I/O pin (Bank 4) |
| 引脚 114 | I/O — User I/O pin (Bank 4) |
| 引脚 115 | I/O — User I/O pin (Bank 4) |
| 引脚 116 | VCCIO4 — I/O Bank 4 reference voltage |
| 引脚 117 | I/O — User I/O pin (Bank 4) |
| 引脚 118 | I/O — User I/O pin (Bank 4) |
| 引脚 119 | I/O — User I/O pin (Bank 4) |
| 引脚 120 | GND — Ground |
| 引脚 121 | I/O — User I/O pin (Bank 4) |
| 引脚 122 | I/O — User I/O pin (Bank 4) |
| 引脚 123 | I/O — User I/O pin (Bank 4) |
| 引脚 124 | I/O — User I/O pin (Bank 4) |
| 引脚 125 | I/O — User I/O pin (Bank 4) |
| 引脚 126 | I/O — User I/O pin (Bank 4) |
| 引脚 127 | I/O — User I/O pin (Bank 4) |
| 引脚 128 | I/O — User I/O pin (Bank 4) |
| 引脚 129 | GND — Ground |
| 引脚 130 | I/O — User I/O pin (Bank 4) |
| 引脚 131 | VCCIO4 — I/O Bank 4 reference voltage |
| 引脚 132 | I/O — User I/O pin (Bank 4) |
| 引脚 133 | I/O — User I/O pin (Bank 4) |
| 引脚 134 | I/O — User I/O pin (Bank 4) |
| 引脚 135 | I/O — User I/O pin (Bank 4) |
| 引脚 136 | I/O — User I/O pin (Bank 4) |
| 引脚 137 | I/O — User I/O pin (Bank 4) |
| 引脚 138 | GND — Ground |
| 引脚 139 | I/O — User I/O pin (Bank 4) |
| 引脚 140 | I/O — User I/O pin (Bank 4) |
| 引脚 141 | I/O — User I/O pin (Bank 4) |
| 引脚 142 | I/O — User I/O pin (Bank 4) |
| 引脚 143 | I/O — User I/O pin (Bank 4) |
| 引脚 144 | VCCINT — Core supply voltage (5V) |
| 引脚 145 | MSEL0 — Configuration mode select 0 |
| 引脚 146 | MSEL1 — Configuration mode select 1 |
| 引脚 147 | nCONFIG — Configuration control (active low) |
| 引脚 148 | nSTATUS — Configuration status (active low) |
| 引脚 149 | DCLK — Configuration clock |
| 引脚 150 | CONF_DONE — Configuration done indicator |
| 引脚 151 | TDI — JTAG test data in |
| 引脚 152 | TCK — JTAG test clock |
| 引脚 153 | TMS — JTAG test mode select |
| 引脚 154 | TDO — JTAG test data out |
| 引脚 155 | I/O — User I/O pin (Bank 1) |
| 引脚 156 | I/O — User I/O pin (Bank 1) |
| 引脚 157 | GND — Ground |
| 引脚 158 | I/O — User I/O pin (Bank 1) |
| 引脚 159 | I/O — User I/O pin (Bank 1) |
| 引脚 160 | I/O — User I/O pin (Bank 1) |
| 引脚 161 | I/O — User I/O pin (Bank 1) |
| 引脚 162 | I/O — User I/O pin (Bank 1) |
| 引脚 163 | I/O — User I/O pin (Bank 1) |
| 引脚 164 | VCCIO1 — I/O Bank 1 reference voltage |
| 引脚 165 | I/O — User I/O pin (Bank 1) |
| 引脚 166 | I/O — User I/O pin (Bank 1) |
| 引脚 167 | I/O — User I/O pin (Bank 1) |
| 引脚 168 | GND — Ground |
| 引脚 169 | I/O — User I/O pin (Bank 1) |
| 引脚 170 | I/O — User I/O pin (Bank 1) |
| 引脚 171 | I/O — User I/O pin (Bank 1) |
| 引脚 172 | I/O — User I/O pin (Bank 1) |
| 引脚 173 | I/O — User I/O pin (Bank 1) |
| 引脚 174 | I/O — User I/O pin (Bank 1) |
| 引脚 175 | I/O — User I/O pin (Bank 1) |
| 引脚 176 | I/O — User I/O pin (Bank 1) |
| 引脚 177 | DEV_OE — Dedicated input - device-wide output enable (active low) |
| 引脚 178 | I/O — User I/O pin (Bank 1) |
| 引脚 179 | I/O — User I/O pin (Bank 1) |
| 引脚 180 | I/O — User I/O pin (Bank 1) |
| 引脚 181 | GND — Ground |
| 引脚 182 | I/O — User I/O pin (Bank 1) |
| 引脚 183 | VCCINT — Core supply voltage (5V) |
| 引脚 184 | I/O — User I/O pin (Bank 2) |
| 引脚 185 | I/O — User I/O pin (Bank 2) |
| 引脚 186 | I/O — User I/O pin (Bank 2) |
| 引脚 187 | I/O — User I/O pin (Bank 2) |
| 引脚 188 | I/O — User I/O pin (Bank 2) |
| 引脚 189 | VCCIO2 — I/O Bank 2 reference voltage |
| 引脚 190 | I/O — User I/O pin (Bank 2) |
| 引脚 191 | I/O — User I/O pin (Bank 2) |
| 引脚 192 | I/O — User I/O pin (Bank 2) |
| 引脚 193 | GND — Ground |
| 引脚 194 | I/O — User I/O pin (Bank 2) |
| 引脚 195 | I/O — User I/O pin (Bank 2) |
| 引脚 196 | I/O — User I/O pin (Bank 2) |
| 引脚 197 | I/O — User I/O pin (Bank 2) |
| 引脚 198 | I/O — User I/O pin (Bank 2) |
| 引脚 199 | I/O — User I/O pin (Bank 2) |
| 引脚 200 | I/O — User I/O pin (Bank 2) |
| 引脚 201 | I/O — User I/O pin (Bank 2) |
| 引脚 202 | GND — Ground |
| 引脚 203 | I/O — User I/O pin (Bank 2) |
| 引脚 204 | VCCIO2 — I/O Bank 2 reference voltage |
| 引脚 205 | I/O — User I/O pin (Bank 2) |
| 引脚 206 | I/O — User I/O pin (Bank 2) |
| 引脚 207 | I/O — User I/O pin (Bank 2) |
| 引脚 208 | I/O — User I/O pin (Bank 2) |
典型应用
EPF8820ARI208-4H 适用于 6 应用s: Legacy 5V Telecom Backplane Glue Logic, PCI / VME / ISA Bus Bridge, Industrial Protocol Converter (RS-232 / RS-485 / SPI / I2C), Legacy Motor Control and Servo Drive Logic, Test Equipment Front-End Logic, Display Controller and Video Timing Generation.
Legacy 5V Telecom Backplane Glue Logic
The EPF8820ARI208-4H is well suited for legacy 5V telecom backplane glue logic because its 5V-tolerant I/O and 148 user I/O pins easily bridge H.110, MVIP, and proprietary bus interfaces. With 8K gates, 672 logic elements, and 5.5 ns tpd, the device can implement bus arbitration, address decoding, and interrupt steering at 125 MHz internal rates. Place the EPF8820ARI208-4H between a 5V backplane and 3.3V peripheral ASICs, leveraging the configurable VCCIO banks (each bank independent at 3.3V or 5V). This avoids external level shifters and reduces BOM. Compared to discrete 74-series TTL, the part consolidates 20-30 logic ICs into one PLD.
推荐
PCI / VME / ISA Bus Bridge
The EPF8820ARI208-4H serves as an effective PCI / VME / ISA bus bridge in industrial and embedded motherboards because its 8K gate capacity handles state-machine based protocol translation across 32-bit buses. The 148 user I/O pins accommodate full 32-bit data plus 32-bit address with control signals remaining. At 5.5 ns tpd the part meets PCI 33 MHz timing with margin. Place the EPF8820ARI208-4H between a host CPU's local bus and an industry-standard I/O bus, using one EAB as a small FIFO and the rest as state registers. This eliminates the need for a costly bus controller ASIC.
推荐
Industrial Protocol Converter (RS-232 / RS-485 / SPI / I2C)
The EPF8820ARI208-4H is ideal for industrial protocol converter designs because its 672 logic elements can implement UART, SPI master/slave, and I2C controller blocks concurrently, with the remaining gates forming protocol translation state machines. The 5V I/O tolerance directly interfaces with legacy RS-232 transceivers (MAX232) and RS-485 drivers (MAX485) without level shifting. With 5.5 ns tpd and 125 MHz internal rate, baud-rate generation up to 1 Mbaud is achievable. Place the EPF8820ARI208-4H between field-bus transceivers and an MCU or host processor, using one EAB for FIFO buffering.
推荐
Legacy Motor Control and Servo Drive Logic
The EPF8820ARI208-4H supports legacy motor control and servo drive logic because its deterministic 5.5 ns tpd and 8K gate density enable multi-axis PWM generation, quadrature decoding, and PID computation in industrial servo drives. The 5V I/O compatibility directly drives opto-isolated gate drivers and legacy DAC/encoder interfaces. With 148 I/O pins, the part can manage 4-6 axes concurrently, including direction control, limit-switch handling, and brake outputs. Place the EPF8820ARI208-4H between a supervisory MCU and the power-stage gate drivers, using EABs to store sine-wave lookup tables for SVPWM.
推荐
Test Equipment Front-End Logic
The EPF8820ARI208-4H fits test equipment front-end designs because its 148 I/O pins and 5.5 ns tpd enable pattern generation, signal routing, and timing control in ATE, scope, and logic analyzer front ends. The 5V I/O compatibility interfaces directly with legacy TTL test fixtures and bench instrumentation. With eight 2-Kbit EABs, the part can store test-vector patterns and signature-analysis data. Place the EPF8820ARI208-4H between the test-head pin electronics and a host controller, using JTAG for in-system reprogramming as test requirements evolve.
推荐
Display Controller and Video Timing Generation
The EPF8820ARI208-4H enables display controller and video timing generation because its 5.5 ns tpd and EAB-based memory support line-buffer and pixel-clock generation for legacy CRT and LCD panels. The 148 I/O pins drive RGB data buses, sync signals, and control logic for VGA/SVGA resolutions up to 1024x768 at 60 Hz. Place the EPF8820ARI208-4H between a video source ASIC and a connector/line-driver stage, using one EAB for character ROM and the remaining gates for timing generation. The 5V I/O is ideal for legacy monitor interfaces.
推荐
推荐产品汇总
工程参考数据： EPF8820ARI208-4H ——对比、设计指导和合规信息。
选型指南
与替代料对比
| 参数 | 本产品 | EPF8820ARI208-4 | EPF8820ARI208-3 | EPF8820ARI208-3N | EPF8820ARC208-4 |
|---|---|---|---|---|---|
| Brand | Altera (Intel) | Altera (Intel) | Altera (Intel) | Altera (Intel) | Altera (Intel) |
| Package | 208-pin RQFP (PQFP) | 208-pin RQFP - same | 208-pin RQFP - same | 208-pin RQFP - same | 208-pin CERQUAD (RQFP-style) |
| Speed Grade | -4H (5.5 ns tpd) | -4 (5.5 ns tpd) | -3 (~3.5 ns tpd) | -3N (~3.5 ns tpd, lead-free) | -4 (5.5 ns tpd) |
| Usable Gates | 8,000 | 8,000 | 8,000 | 8,000 | 8,000 |
| Logic Elements | 672 | 672 | 672 | 672 | 672 |
| User I/O | 148 | 148 | 148 | 148 | 148 |
| Temperature Grade | Industrial | Industrial | Industrial | Industrial | Industrial / Military |
| Lead Finish | Standard (SnPb or matte Sn) | Standard | Standard | Lead-free (RoHS) | Standard (CERQUAD) |
| Lifecycle Status | Obsolete | Obsolete | Obsolete | Obsolete | Obsolete |
| Param Match % | 100 (reference) | 100 | 90 | 90 | 95 |
关键差异点
- Enhanced AC test screen (-4H speed grade) （对比 EPF8820ARI208-4)
- Industrial-grade operating range （对比 EPF8820ARC208-4)
- Same-die pin compatibility across speed grades （对比 EPF8820ARI208-3)
设计说明
The EPF8820ARI208-4H core draws up to approximately 200 mA at 5V (1W) plus per-bank I/O current proportional to switching frequency and load. Each VCCINT pin must be bypassed with a 0.1 uF ceramic capacitor placed within 5 mm of the pin, and bulk 10 uF tantalum or aluminum polymer caps at the board supply entry. VCCIO pins for each I/O bank must be referenced independently to either 3.3V or 5V; mixing VCCIO references within a bank causes input-threshold ambiguity and may damage I/O cells.
The 208-pin RQFP package uses 0.5 mm pitch gull-wing leads. Recommended land pattern is per IPC-7351 nominal-density with 0.30 mm pad width and 1.30 mm pad length. Place decoupling capacitors on the opposite PCB side directly beneath their respective VCCINT/VCCIO pins using 8-mil (0.2 mm) micro vias for shortest return-path inductance. Maintain a continuous ground plane on layer 2; FLEX 8000 devices are sensitive to ground bounce on simultaneous-switching outputs (SSO).
Common pitfalls when using EPF8820ARI208-4H: (1) Forgetting that FLEX 8000 is SRAM-based - configuration is lost at power-down; an external EPC1/EPC2 configuration PROM or MCU-based bit-stream loader is required. (2) Driving 5V TTL signals into 3.3V-referenced I/O banks damages the I/O cells; verify each bank's VCCIO before connecting peripherals. (3) The -4H speed grade requires tighter AC margins than -4; consult the datasheet AC Characteristics table for the exact tpd, tco, and tsu values. (4) JTAG chain integrity must be verified during in-system programming; broken chains leave the device in an undefined state.
Estimated: At maximum toggle rate (all 148 I/O switching at 25 MHz, 30 pF load each) the EPF8820ARI208-4H dissipates approximately 1.5W internally. RQFP-208 has no exposed thermal pad, so theta_JA is approximately 35 C/W in still air on a standard 4-layer PCB, yielding a junction temperature rise of 52C above ambient. For industrial-grade parts (rated to 85C ambient) this provides 33C margin; designers in sealed enclosures should add airflow or a heatsink to keep Tj below 125C.
合规信息
RoHS/REACH status not confirmed in available data. The -3N speed-grade variant of this family is explicitly lead-free (RoHS compliant) per Altera's legacy datasheet ordering scheme. Original -4H parts may use SnPb or matte-Sn finish; verify with distributor. AEC-Q100 not applicable - FLEX 8000 is not an automotive-grade family.
