EP1810LI-25 - 48-Macrocell Classic EPLD, 25ns, 68-PLCC | Altera
MPN: EP1810LI-25 β End of Life| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $18.5 | $18.50 |
| 10 | $16.2 | $162.00 |
| 100 | $13.85 | $1,385.00 |
| 500 | $11.4 | $5,700.00 |
| 1,000 | $9.95 | $9,950.00 |
Drop-in alternatives for EP1810LI-25 β same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Quick Comparison Tool β Select alternative parts for side-by-side comparison:
EP1810LC-25
β Drop-Inβ In Stock
$8.4 / Unit
View Datasheet βEP1810LC-25T
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View Datasheet βEP1810LC-35
β Drop-Inβ In Stock
$49.2 / Unit
View Datasheet βEP1810LC-45
β Drop-Inβ In Stock
$49.9 / Unit
View Datasheet βEP1810LI-25 Maximum Ratings & Electrical Characteristics
| Family | Altera Classic EPLD |
| Device Type | EPLD (Erasable Programmable Logic Device), UV-erasable / OTP |
| Macrocells | 48 |
| Usable Gates | 900 |
| Propagation Delay (tPD) | 25 ns |
| Maximum Counter Frequency | 40 MHz |
| Supply Voltage (VCC) | 4.5 V to 5.5 V (nominal 5 V) |
| I/O Pins | 48 |
| Dedicated Inputs | 12 |
| Global Clock Inputs | 4 |
| Interconnect | Programmable global and local buses |
| Package | 68-pin PLCC (J68, J-Lead) |
| JESD-30 Package Code | S-PQCC-J68 |
| Process Technology | CMOS |
| Operating Temperature (Industrial 'I' suffix) | -40 C to +85 C |
| Programming Mode | EPROM/UV-erasable (windowed) and OTP |
| Development Tool | Altera MAX+PLUS II |
| RoHS Status | unknown |
| Lead-Free Status | unknown |
EP1810LI-25 Pin Configuration
| Pin 1 | GND β Ground |
| Pin 2 | I/O β Macrocell I/O pin (bank A) |
| Pin 3 | I/O β Macrocell I/O pin (bank A) |
| Pin 4 | I/O β Macrocell I/O pin (bank A) |
| Pin 5 | I/O β Macrocell I/O pin (bank A) |
| Pin 6 | I/O β Macrocell I/O pin (bank A) |
| Pin 7 | I/O β Macrocell I/O pin (bank A) |
| Pin 8 | I/O β Macrocell I/O pin (bank A) |
| Pin 9 | I/O β Macrocell I/O pin (bank A) |
| Pin 10 | I/O β Macrocell I/O pin (bank A) |
| Pin 11 | I/O β Macrocell I/O pin (bank A) |
| Pin 12 | I/O β Macrocell I/O pin (bank A) |
| Pin 13 | GLOBAL_CLK1 β Global clock input 1 |
| Pin 14 | I/O β Macrocell I/O pin (bank A) |
| Pin 15 | I/O β Macrocell I/O pin (bank A) |
| Pin 16 | GND β Ground |
| Pin 17 | I/O β Macrocell I/O pin (bank A) |
| Pin 18 | I/O β Macrocell I/O pin (bank A) |
| Pin 19 | I/O β Macrocell I/O pin (bank A) |
| Pin 20 | I/O β Macrocell I/O pin (bank A) |
| Pin 21 | I/O β Macrocell I/O pin (bank A) |
| Pin 22 | VCC β +5 V supply |
| Pin 23 | I/O β Macrocell I/O pin (bank A) |
| Pin 24 | I/O β Macrocell I/O pin (bank A) |
| Pin 25 | DEDICATED_IN β Dedicated input pin |
| Pin 26 | DEDICATED_IN β Dedicated input pin |
| Pin 27 | DEDICATED_IN β Dedicated input pin |
| Pin 28 | DEDICATED_IN β Dedicated input pin |
| Pin 29 | GLOBAL_CLK2 β Global clock input 2 |
| Pin 30 | DEDICATED_IN β Dedicated input pin |
| Pin 31 | DEDICATED_IN β Dedicated input pin |
| Pin 32 | DEDICATED_IN β Dedicated input pin |
| Pin 33 | GND β Ground |
| Pin 34 | DEDICATED_IN β Dedicated input pin |
| Pin 35 | DEDICATED_IN β Dedicated input pin |
| Pin 36 | DEDICATED_IN β Dedicated input pin |
| Pin 37 | GLOBAL_CLK3 β Global clock input 3 |
| Pin 38 | I/O β Macrocell I/O pin (bank B) |
| Pin 39 | I/O β Macrocell I/O pin (bank B) |
| Pin 40 | I/O β Macrocell I/O pin (bank B) |
| Pin 41 | VCC β +5 V supply |
| Pin 42 | I/O β Macrocell I/O pin (bank B) |
| Pin 43 | I/O β Macrocell I/O pin (bank B) |
| Pin 44 | I/O β Macrocell I/O pin (bank B) |
| Pin 45 | I/O β Macrocell I/O pin (bank B) |
| Pin 46 | I/O β Macrocell I/O pin (bank B) |
| Pin 47 | GND β Ground |
| Pin 48 | I/O β Macrocell I/O pin (bank B) |
| Pin 49 | I/O β Macrocell I/O pin (bank B) |
| Pin 50 | I/O β Macrocell I/O pin (bank B) |
| Pin 51 | I/O β Macrocell I/O pin (bank B) |
| Pin 52 | I/O β Macrocell I/O pin (bank B) |
| Pin 53 | I/O β Macrocell I/O pin (bank B) |
| Pin 54 | GLOBAL_CLK4 β Global clock input 4 |
| Pin 55 | I/O β Macrocell I/O pin (bank B) |
| Pin 56 | I/O β Macrocell I/O pin (bank B) |
| Pin 57 | I/O β Macrocell I/O pin (bank B) |
| Pin 58 | I/O β Macrocell I/O pin (bank B) |
| Pin 59 | I/O β Macrocell I/O pin (bank B) |
| Pin 60 | I/O β Macrocell I/O pin (bank B) |
| Pin 61 | I/O β Macrocell I/O pin (bank B) |
| Pin 62 | I/O β Macrocell I/O pin (bank B) |
| Pin 63 | GND β Ground |
| Pin 64 | I/O β Macrocell I/O pin (bank B) |
| Pin 65 | I/O β Macrocell I/O pin (bank B) |
| Pin 66 | I/O β Macrocell I/O pin (bank B) |
| Pin 67 | I/O β Macrocell I/O pin (bank B) |
| Pin 68 | I/O β Macrocell I/O pin (bank B) |
Safe Operating Area (SOA) & Thermal Characteristics
No official SOA curve available for this digital IC. Always operate within absolute maximum ratings specified in the datasheet. Ensure adequate cooling and derate as needed.
Typical Applications
EP1810LI-25 is suitable for 6 applications: 5 V Address Decoding and Bus Glue Logic, Peripheral and Memory Controller Interface, State Machine and FIFO Replacement, Legacy Telecom Backplane Interface, Industrial Control and Instrumentation I/O, Pin-Compatible Legacy Equipment Repair.
5 V Address Decoding and Bus Glue Logic
The EP1810LI-25 is well suited to 5 V address decoding and bus-interface glue logic on legacy ISA, VME and Multibus backplanes. Its 48 macrocells deliver enough sum-of-products terms to decode full 24-bit address spaces, while the 25 ns tPD keeps the decoder comfortably ahead of standard 8 MHz-25 MHz bus cycles. The 12 dedicated inputs let each macrocell absorb a full address bit plus chip-select qualifier without burning I/O. Industrial -40 C to +85 C operation supports factory-floor backplanes, and the EPROM/UV-erasable cell allows late-stage design fixes on existing boards. Compared with discrete 74LS/74FTTL decoder trees, the EP1810LI-25 collapses what would be 8-12 packages into a single 68-pin PLCC, reducing board area and improving noise margin. For higher-speed buses (>33 MHz) choose a 20 ns grade such as EP1810LC-20T; for slower 8 MHz buses the 35/45 ns grades are also drop-in compatible.
Recommended
Peripheral and Memory Controller Interface
In peripheral and memory controllers, the EP1810LI-25 replaces clusters of 74-series glue logic that generate chip-select, read/write strobes and wait-state timing. The four global clock inputs support synchronous state machines for burst-mode DRAM or DMA handshakes up to 40 MHz counter frequency, while the 48 I/O pins map directly to typical 16-bit data plus 24-bit address plus control lines. With 25 ns tPD the device fits comfortably within a 40 ns memory cycle, leaving margin for board-level skew. The EPROM cell is useful for late bug-fixes on shipping controllers, and the on-board test circuitry permits AC verification during production flow. For modern designs, a MAX II EPM240 or MAX V CPLD provides JTAG-ISP and 3.3 V I/O at lower cost, but the EP1810LI-25 remains the maintenance part of choice for installed 5 V controller boards.
Recommended
State Machine and FIFO Replacement
The EP1810LI-25's macrocell architecture with configurable D/T/JK/SR flip-flops makes it ideal for replacing discrete MSI state-machine and FIFO glue logic. A typical 16-state sequencer fits in 4-6 macrocells, leaving capacity for handshake flags, counters and CRC generators within the same 48-macrocell budget. The 25 ns tPD supports state-machine transitions at 40 MHz - fast enough for instrumentation and telecom control paths. Programmable global/local buses let designers route flag and data lines without manual trace swaps, accelerating turnaround versus hand-wired PALs. Compared with a 16V8 or 22V10 PAL, the EP1810LI-25 offers 3-4x the macrocell density and four dedicated clock domains, eliminating the timing skew caused by daisy-chained PAL outputs in larger sequencers. For new state-machine designs an EPM240 or MAX V CPLD is recommended; for legacy board repairs the EP1810LI-25 is the canonical drop-in.
Recommended
Legacy Telecom Backplane Interface
The EP1810LI-25 is well matched to 5 V telecom backplane interfaces - HDLC/SDLC controllers, T1/E1 framers and legacy serial backplanes - where deterministic 25 ns pin-to-pin delay and 4.5-5.5 V supply tolerance simplify interface with bipolar and CMOS line-interface units. Its 48 macrocells can absorb channel-association logic for 4-8 full-duplex T1/E1 ports, while the four global clocks support independent receive/transmit timing domains without external clock buffers. The industrial -40 C to +85 C range covers central-office and outside-plant cabinets. UV-erasable windowed packages allow in-the-field pattern updates during equipment revs, a significant advantage over one-time-programmable PALs. For new telecom designs the MAX II CPLD family offers 3.3 V I/O and lower power; for legacy repair and expansion, the EP1810LI-25 remains in service across thousands of installed central-office shelves.
Recommended
Industrial Control and Instrumentation I/O
In industrial control PLCs, motor drives and test instrumentation, the EP1810LI-25 implements the deterministic glue logic between microcontrollers, ADC/DAC converters and high-voltage driver stages. The 25 ns tPD comfortably handles encoder decoding, pulse-train generation and PWM blanking at industrial clock rates up to 40 MHz, while the 48 I/O pins interface to parallel ADC/DAC buses, optocouplers and relay drivers. The 4.5-5.5 V supply range tolerates regulated 5 V industrial rails, and the -40 C to +85 C industrial temperature grade handles factory-floor thermal stress. EPROM/UV-erasable programmability allows late-stage customization for OEM-specific I/O maps, while the on-board test mode supports production AC verification of every programmed unit. For new industrial designs a MAX 10 or MAX V CPLD is recommended; for legacy PLC repairs, the EP1810LI-25 remains the canonical maintenance part.
Recommended
Pin-Compatible Legacy Equipment Repair
The EP1810LI-25's primary ongoing role in 2026 is as a maintenance and repair part for installed equipment originally built around Altera's Classic EPLD family - everything from 1990s-era industrial controllers and telecom gear to legacy avionics, medical instrumentation and military systems. Because the entire Classic family shares a common 48-macrocell architecture and 68-pin J-lead carrier family, the EP1810LI-25 is interchangeable with EP1810LC-25, EP1810LC-35, EP1810LC-45 and the corresponding 'I' (industrial) and 'M' (mil) suffixes without any board changes. Replacement requires only that the speed grade be equal to or slower than the original, which the datasheet's tPD bins make straightforward to verify. For high-reliability or traceable stock, request lot-date-code and MIL-883 variants such as EP1810GM883 or EP1810GM883B, which provide full military screening. The independent open market remains the primary supply channel, with franchised brokers offering factory-original inventory.
Recommended
Recommended Products Summary
Engineering reference data for EP1810LI-25 β comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | EP1810LC-25 | EP1810LC-25T | EP1810LC-35 | EP1810LC-45 |
|---|---|---|---|---|---|
| Brand | Altera | Altera | Altera | Altera | Altera |
| Package | 68-pin PLCC (J68) | 68-pin PLCC - same | 68-pin PLCC - same | 68-pin PLCC - same | 68-pin PLCC - same |
| Macrocells | 48 | 48 | 48 | 48 | 48 |
| Propagation Delay (tPD) | 25 ns | 25 ns | 25 ns | 35 ns | 45 ns |
| Maximum Counter Frequency | 40 MHz | 40 MHz | 40 MHz | 28.5 MHz | 22 MHz |
| Supply Voltage | 4.5 V to 5.5 V | 4.5 V to 5.5 V | 4.5 V to 5.5 V | 4.5 V to 5.5 V | 4.5 V to 5.5 V |
| Operating Temperature | -40 C to +85 C (industrial) | 0 C to +70 C (commercial) | 0 C to +70 C (commercial) | 0 C to +70 C (commercial) | 0 C to +70 C (commercial) |
| Lifecycle Status | Obsolete | Obsolete | Obsolete | Obsolete | Obsolete |
Key Differentiators
- Industrial temperature grade in 68-pin PLCC (vs EP1810LC-25)
- Mid-range 25 ns speed grade (vs EP1810LC-45)
- Industry-standard 5 V supply with 48 macrocells (vs EP1810LC-35)
Design Notes
The EP1810LI-25 requires a single 5 V supply within 4.5-5.5 V. Place a 0.1 uF ceramic bypass capacitor as close as possible to each VCC pin (pins 22 and 41 on the 68-PLCC), plus a bulk 10-47 uF tantalum or aluminum capacitor on the supply rail. The Classic EPLD CMOS core draws modest current (<200 mA typical at 40 MHz across all outputs); however, transient current spikes during simultaneous macrocell switching can exceed 500 mA peak, so decoupling must be low-ESR. Do not operate below 4.5 V - the EPROM sense-amplifier margin is reduced and tPD may stretch beyond the 25 ns guarantee.
The 68-pin PLCC package uses J-leads on a 1.27 mm pitch; a PLCC socket is strongly recommended for prototyping and field service. For production SMT, the land pattern must follow JEDEC MO-047 (PLCC) with thermal relief on the ground pads. Keep high-speed traces (<5 cm) and route each macrocell I/O away from clock and VCC traces to avoid coupling. Tie all unused I/O pins to GND through a resistor or directly, per the EP1810 datasheet's recommendation, to minimize supply-current noise. Maintain a continuous ground plane under the device to control the 4 ns output-edge rise/fall times.
Three pitfalls dominate EP1810LI-25 designs: (1) Mixing EP1810 speed grades on the same bus - a 25 ns grade can replace a 35 ns or 45 ns grade, but the reverse is unsafe; (2) Driving 3.3 V logic directly from 5 V outputs without a level shifter - the EP1810's outputs are TTL-compatible 5 V CMOS and will overdrive modern 3.3 V inputs; (3) Forgetting the on-board test-mode disable - leaving the device in test mode after production flow can cause erratic behavior in-circuit. Always run a final verification pass with the MAX+PLUS II programmer's functional-test option before sealing UV-windowed packages. Programmed windowed packages should have their quartz window covered with an opaque label to prevent data loss under ambient UV (sunlight, fluorescent).
Compliance Information
The EP1810LI-25 was introduced before RoHS compliance was standard; Altera/Intel does not publish a current compliance statement for this obsolete part. Verified Web Data does not list RoHS, REACH, lead-free, halogen-free or conflict-minerals status. For RoHS-compliant Classic EPLD replacements, contact Intel FPGA or franchised brokers for traceable date-coded stock.
