EPM7256AQC208-7 - MAX 7000A CPLD 256 Macrocells | Altera
MPN: EPM7256AQC208-7 ✗ Cuối đờiEPM7256AQC208-7 Tóm tắt
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.
Bộ thay thế dễ dàng lắp đặt cho EPM7256AQC208-7 — cùng gói, chân-to-chân tương thích. Các bộ phận yêu cầu hàn PCB bị loại trừ.
Các biến thể trong loạt này
Các mẫu cùng loạt có thể lắp đặt dễ dàng tương thích với EPM7256AQC208-7 (cùng hình factor và footprint) — khác nhau ở Package, RoHS Status, Family, User I/O Pins, Operating Temperature Range.
EPM7256AQC208-7N
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
EPM7256AQC208-10
✅ Drop-In ⚠️ Thông số chưa được xác minh📋 Tham chiếu thay thế (không có trong danh mục)
EPM7256AQC208-10N
✅ Drop-In ⚠️ Thông số chưa được xác minh📋 Tham chiếu thay thế (không có trong danh mục)
EPM7256AQC208-5
✅ Drop-In ⚠️ Thông số chưa được xác minh📋 Tham chiếu thay thế (không có trong danh mục)
EPM7256AQC208-15
✅ Drop-In ⚠️ Thông số chưa được xác minh📋 Tham chiếu thay thế (không có trong danh mục)
EPM7256AEQC208-7N
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
EPM7256AQC208-7 Tỷ lệ tối đa & tính chất điện
| 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) |
| Hộp | 208-Pin PQFP (28 x 28 mm) |
| Supplier Device Package | 208-PQFP (28x28) |
| Kiểu lắp đặt | Surface Mount |
| Khoảng nhiệt độ hoạt động | 0C to +70C (commercial) |
| JTAG Interface | IEEE 1149.1 (JTAG) boundary scan |
| Configuration Memory | EEPROM (non-volatile) |
| Speed Grade | -7 |
Cấu hình chân EPM7256AQC208-7
| Chân 1 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Chân 2 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Chân 3 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Chân 4 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Chân 5 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Chân 6 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Chân 7 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Chân 8 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Chân 9 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Chân 10 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Chân 11 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Chân 12 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Chân 13 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Chân 14 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Chân 15 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Chân 16 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Chân 17 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Chân 18 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Chân 19 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Chân 20 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Chân 21 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Chân 22 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Chân 23 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Chân 24 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Chân 25 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Chân 26 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Chân 27 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Chân 28 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Chân 29 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Chân 30 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Chân 31 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Chân 32 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Chân 33 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Chân 34 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Chân 35 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Chân 36 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Chân 37 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Chân 38 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Chân 39 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Chân 40 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Chân 41 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Chân 42 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Chân 43 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Chân 44 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Chân 45 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Chân 46 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Chân 47 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Chân 48 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Chân 49 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Chân 50 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Chân 51 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Chân 52 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Chân 53 | GND — Ground |
| Chân 54 | VCCINT — Internal 3.3 V core supply |
| Chân 55 | GND — Ground |
| Chân 56 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Chân 57 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Chân 58 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Chân 59 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Chân 60 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Chân 61 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Chân 62 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Chân 63 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Chân 64 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Chân 65 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Chân 66 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Chân 67 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Chân 68 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Chân 69 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Chân 70 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Chân 71 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Chân 72 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Chân 73 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Chân 74 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Chân 75 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Chân 76 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Chân 77 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Chân 78 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Chân 79 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Chân 80 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Chân 81 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Chân 82 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Chân 83 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Chân 84 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Chân 85 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Chân 86 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Chân 87 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Chân 88 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Chân 89 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Chân 90 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Chân 91 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Chân 92 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Chân 93 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Chân 94 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Chân 95 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Chân 96 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Chân 97 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Chân 98 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Chân 99 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Chân 100 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Chân 101 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Chân 102 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Chân 103 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Chân 104 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Chân 105 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Chân 106 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Chân 107 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Chân 108 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Chân 109 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Chân 110 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Chân 111 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Chân 112 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Chân 113 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Chân 114 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Chân 115 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Chân 116 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Chân 117 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Chân 118 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Chân 119 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Chân 120 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Chân 121 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Chân 122 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Chân 123 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Chân 124 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Chân 125 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Chân 126 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Chân 127 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Chân 128 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Chân 129 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Chân 130 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Chân 131 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Chân 132 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Chân 133 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Chân 134 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Chân 135 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Chân 136 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Chân 137 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Chân 138 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Chân 139 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Chân 140 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Chân 141 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Chân 142 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Chân 143 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Chân 144 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Chân 145 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Chân 146 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Chân 147 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Chân 148 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Chân 149 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Chân 150 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Chân 151 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Chân 152 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Chân 153 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Chân 154 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Chân 155 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Chân 156 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Chân 157 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Chân 158 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Chân 159 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Chân 160 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Chân 161 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Chân 162 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Chân 163 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Chân 164 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Chân 165 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Chân 166 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Chân 167 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Chân 168 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Chân 169 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Chân 170 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Chân 171 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Chân 172 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Chân 173 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Chân 174 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Chân 175 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Chân 176 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Chân 177 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Chân 178 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Chân 179 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Chân 180 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Chân 181 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Chân 182 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Chân 183 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Chân 184 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Chân 185 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Chân 186 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Chân 187 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Chân 188 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Chân 189 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Chân 190 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Chân 191 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Chân 192 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Chân 193 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Chân 194 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Chân 195 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Chân 196 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Chân 197 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Chân 198 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Chân 199 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Chân 200 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Chân 201 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Chân 202 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Chân 203 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Chân 204 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Chân 205 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Chân 206 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Chân 207 | I/O — General-purpose user I/O (MultiVolt compatible) |
| Chân 208 | I/O — General-purpose user I/O (MultiVolt compatible) |
Ứng dụng tiêu biểu
EPM7256AQC208-7 phù hợp cho 6 Áp dụngs: 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.
Được đề xuất
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.
Được đề xuất
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.
Được đề xuất
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.
Được đề xuất
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.
Được đề xuất
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.
Được đề xuất
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| Tham số | Sản phẩm này | 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) |
Bảo phân biệt quan trọng
- Non-volatile EEPROM configuration with instant-on operation (vsEPM7256AQC208-10)
- Highest speed grade in the 208-pin PQFP MAX 7000A family (vsEPM7256AQC208-15)
- Lead-free option available with identical electrical performance (vsEPM7256AQC208-7N)
- High I/O density for bus consolidation (vsEPM7256AETC144-7)
Ghi chú thiết kế
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.
Thông tin tuân thủ
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.
