EP610IPC-25 - 25ns Classic EPLD, 20 I/O, 5V CMOS | Intel/Altera
MPN: EP610IPC-25 β End of Life| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $18.5 | $18.50 |
| 10 | $15.75 | $157.50 |
| 100 | $12.4 | $1,240.00 |
| 500 | $10.2 | $5,100.00 |
| 1,000 | $8.85 | $8,850.00 |
EP610IPC-25 Overview
A Classic EPLD is an early-generation programmable logic device that combines multiple PAL (Programmable Array Logic) and GAL (Generic Array Logic) functions into a single erasable, reprogrammable IC fabricated in CMOS. EPLDs sit in the hierarchy between simple PLDs (PALs/GALs) and modern FPGAs/CPUs - they offer non-volatile, in-system reprogrammable logic that integrates glue logic, state machines, address decoding, and bus interfacing on a single chip. The EP610 family was one of Altera's foundational product lines in the 1980s and remains in service for legacy industrial, military refresh, and long-lifecycle equipment designs.
Key features of the EP610IPC-25 include 100% TTL emulation of standard 10K/100K ECL and 74LS logic functions, macrocell-based output architecture with configurable registered or combinatorial outputs, and on-chip erasable CMOS memory for in-system reprogrammability. The device supports multiple package options across the family and is JEDEC-standard pinout compatible within the EP610 series, enabling drop-in speed-grade and temperature-grade substitution.
The architecture combines a programmable AND/OR array with dedicated output macrocells, allowing designers to replace dozens of 74LS TTL gates with a single chip. This density advantage, combined with CMOS power consumption (typically under 200 mW active), made the EP610 family a workhorse for industrial control, telecommunications glue logic, and legacy computing systems. The 'IPC-25' suffix denotes the 24-pin plastic DIP package with a 25 ns speed grade.
Typical applications include address decoding and bus interfacing in 8086/68000-based embedded systems, glue logic integration in telecommunications equipment, state machine implementation in industrial controllers, and legacy TTL/74LS logic replacement. The wide supply tolerance (4.75V-5.25V) makes it tolerant of unregulated 5V rails commonly found in industrial backplanes.
When designing with this device, verify that the 25 ns propagation delay meets your critical timing path requirements - the EP610 family is offered in speed grades from 15 ns to 35 ns. Note that this is an OTP (one-time programmable) windowless plastic package; for prototyping or development use the CERDIP/UV-erasable variants (EP610DC/EP610DM).
This page synthesizes distributor pricing, same-family speed-grade alternatives, and practical design notes for the EP610IPC-25 that go beyond the manufacturer datasheet.
Drop-in alternatives for EP610IPC-25 β same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Variants in this series
Same-series models that are drop-in compatible with EP610IPC-25 (same form factor and footprint) β differing in Package, Mounting Type, Supply Voltage (VCC), Family, Operating Temperature.
Quick Comparison Tool β Select alternative parts for side-by-side comparison:
EP610IPC-15
β Drop-Inπ Reference alternative (not in catalog)
EP610IPC-35
β Drop-Inπ Reference alternative (not in catalog)
EP610IPC-10
β Drop-Inβ In Stock
$16.4 / Unit
View Datasheet βEP610ILC-25
β Drop-Inβ In Stock
$9.85 / Unit
View Datasheet βEP610DC-25
β Drop-Inβ In Stock
$9.95 / Unit
View Datasheet βEP610ILC-10
β Drop-Inβ In Stock
$7.2 / Unit
View Datasheet βEP610IPC-25 Maximum Ratings & Electrical Characteristics
| Family | Classic EPLD (EP610) |
| Architecture | PAL-type, CMOS, Erasable |
| Propagation Delay (tpd) | 25 ns (max) |
| Supply Voltage (VCC) | 4.75 V to 5.25 V |
| Maximum Inputs | 20 |
| Maximum I/O Pins | 16 |
| Dedicated Outputs | 16 |
| Product Terms | 160 |
| Operating Temperature | 0 Β°C to +70 Β°C (Commercial) |
| Package | 24-pin PDIP (Plastic DIP) |
| Technology | CMOS, UV-erasable (windowless in IPC pkg) |
| TTL Compatibility | 100% TTL emulation |
| Mounting Type | Through-Hole |
| RoHS Status | Non-compliant (contains Pb, PDIP package) |
| Logic Capacity | Equivalent to ~24 standard 24-pin PALs |
EP610IPC-25 Pin Configuration
| Pin 1 | I/O β Input/Output macrocell 1 |
| Pin 2 | I/O β Input/Output macrocell 2 |
| Pin 3 | I/O β Input/Output macrocell 3 |
| Pin 4 | I/O β Input/Output macrocell 4 |
| Pin 5 | I/O β Input/Output macrocell 5 |
| Pin 6 | I/O β Input/Output macrocell 6 |
| Pin 7 | I/O β Input/Output macrocell 7 |
| Pin 8 | I/O β Input/Output macrocell 8 |
| Pin 9 | I/O β Input/Output macrocell 9 |
| Pin 10 | I/O β Input/Output macrocell 10 |
| Pin 11 | I/O β Input/Output macrocell 11 |
| Pin 12 | GND β Ground |
| Pin 13 | I/O β Input/Output macrocell 12 |
| Pin 14 | I/O β Input/Output macrocell 13 |
| Pin 15 | I/O β Input/Output macrocell 14 |
| Pin 16 | I/O β Input/Output macrocell 15 |
| Pin 17 | I/O β Input/Output macrocell 16 |
| Pin 18 | INPUT β Dedicated input |
| Pin 19 | INPUT β Dedicated input |
| Pin 20 | INPUT β Dedicated input |
| Pin 21 | INPUT β Dedicated input |
| Pin 22 | INPUT β Dedicated input |
| Pin 23 | INPUT β Dedicated input |
| Pin 24 | VCC β Supply voltage (+5V) |
Typical Applications
EP610IPC-25 is suitable for 6 applications: Address Decoding in 8086/68000 Embedded Systems, TTL/74LS Logic Integration and Replacement, State Machine Implementation in Industrial Controllers, Glue Logic in Telecommunications Equipment, Bus Interface and Protocol Bridging, Legacy Industrial Control System Refresh.
Address Decoding in 8086/68000 Embedded Systems
The EP610IPC-25's 25 ns propagation delay and 20-input capacity make it well-suited for address decoding in legacy 8086 and 68000 microprocessor systems. The device replaces multiple 74LS138/74LS139 decoder chips by generating chip-select signals for memory and peripheral banks from address bus inputs. With 160 product terms available across 16 macrocell outputs, designers can implement complex address maps including memory-mapped I/O, bank switching, and wait-state generation in a single chip. The CMOS architecture draws less power than discrete 74LS logic, critical for industrial backplane systems where heat dissipation is constrained. Reference design: connect the 20-bit address bus to EP610 inputs and route the 16 macrocell outputs to peripheral chip-select pins.
Recommended
TTL/74LS Logic Integration and Replacement
The EP610IPC-25 supports 100% TTL emulation, allowing designers to integrate multiple 74LS-series TTL gates, decoders, multiplexers, and flip-flops into a single chip. A typical design might replace 8-24 standard 24-pin PAL/GAL devices with one EP610IPC-25, reducing PCB area, power consumption, and BOM cost. The 5V single-supply operation matches existing TTL rails without level translation. With 16 dedicated outputs and 160 product terms, the device can implement complex combinational and registered logic. Industrial customers often use this part to consolidate legacy 74LS logic boards where through-hole PDIP packages match the original PCB layout, avoiding costly board respins.
Recommended
State Machine Implementation in Industrial Controllers
The EP610IPC-25's macrocell architecture with configurable registered outputs makes it ideal for implementing FSM (finite state machine) controllers in industrial automation. Each of the 16 macrocells can be configured as D, T, JK, or SR flip-flop with feedback to the AND array, supporting Mealy and Moore state machines of meaningful complexity. The 25 ns clock-to-output delay supports state machines operating up to 40 MHz, suitable for PLC scan engines and motor control sequencers. Designers implement state encoding (binary, one-hot, Gray) in the AND array and route registered outputs back as state feedback. This pattern is widely used in factory automation where long product lifecycles demand stable, NRND-tolerant logic components.
Recommended
Glue Logic in Telecommunications Equipment
Telecommunications infrastructure from the 1990s extensively deployed EP610-family EPLDs for glue logic between microprocessors, DSPs, and framer/serializer chips. The EP610IPC-25's 25 ns timing is compatible with T1/E1 (1.544/2.048 MHz) and basic ISDN (BRI 192 kbps) data rates, providing bus arbitration, interrupt prioritization, and protocol-state handling. With 20 inputs, the device can monitor multiple status and data lines simultaneously and generate complex handshake sequences. Modern telecom refresh programs continue to source EP610IPC-25 for legacy equipment maintenance where redesigns require lengthy carrier re-certification. The CMOS power profile is essential for the high-density line cards common in central-office equipment.
Recommended
Bus Interface and Protocol Bridging
The EP610IPC-25 is widely deployed as a bus-interface bridge between microprocessors with mismatched bus widths, timing, or voltage levels. With 16 dedicated outputs and 20 inputs, it can multiplex/demultiplex 8-bit and 16-bit buses, generate wait states, and convert between Intel and Motorola bus protocols. The 5V tolerance matches TTL/CMOS peripherals, and the 25 ns propagation delay supports ISA bus and similar 8 MHz legacy standards. Military and aerospace programs particularly value the EP610 family's proven reliability and long-term availability through industrial distributors, often specifying it for new designs where the proven CMOS process and JEDEC-standard pinout outweigh the appeal of newer CPLD families.
Recommended
Legacy Industrial Control System Refresh
Long-lifecycle industrial equipment (machine tools, textile machinery, printing presses, semiconductor fab tools installed in the 1990s) frequently requires EP610IPC-25 for board-level repair and refresh. These systems were designed around the EP610 family and have decades of installed-base knowledge. The 24-pin PDIP package matches through-hole PCB footprints common in industrial designs, allowing direct socket replacement. The NRND status creates supply-chain pressure - many customers stockpile the part or work with distributors for scheduled multi-year deliveries. For new industrial designs requiring similar functionality, MAX II CPLDs in QFP packages provide RoHS compliance and active lifecycle support, but EP610IPC-25 remains irreplaceable for legacy maintenance.
Recommended
Recommended Products Summary
Engineering reference data for EP610IPC-25 β comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | EP610IPC-15 | EP610IPC-35 | EP610IPC-10 | EP610ILC-25 | EP610DC-25 |
|---|---|---|---|---|---|---|
| Brand | Intel (formerly Altera) | Intel (formerly Altera) | Intel (formerly Altera) | Intel (formerly Altera) | Intel (formerly Altera) | Intel (formerly Altera) |
| Package | PDIP-24 | PDIP-24 (same) | PDIP-24 (same) | PDIP-24 (same) | PDIP-24 (same) | CERDIP-24 (windowed) |
| Propagation Delay (tpd) | 25 ns | 15 ns | 35 ns | 10 ns | 25 ns | 25 ns |
| Temperature Grade | Commercial (0C to +70C) | Commercial | Commercial | Commercial | Industrial (-40C to +85C) | Commercial |
| Maximum Inputs | 20 | 20 | 20 | 20 | 20 | 20 |
| Dedicated Outputs / Macrocells | 16 | 16 | 16 | 16 | 16 | 16 |
| Product Terms | 160 | 160 | 160 | 160 | 160 | 160 |
| Supply Voltage | 4.75V to 5.25V | 4.75V to 5.25V | 4.75V to 5.25V | 4.75V to 5.25V | 4.75V to 5.25V | 4.75V to 5.25V |
| Lifecycle Status | NRND | NRND | NRND | NRND | NRND | NRND |
Key Differentiators
- Faster speed in same PDIP-24 footprint (vs EP610IPC-35)
- Industrial temperature grade availability (vs EP610ILC-25)
- UV-erasable window for development (vs EP610DC-25)
Design Notes
The EP610IPC-25 draws approximately 200 mW active power from a single 5V supply - significantly less than equivalent 74LS TTL implementations (which would draw 1-2W). Decouple VCC (pin 24) with a 0.1 Β΅F ceramic capacitor placed within 5 mm of the supply lead, plus a bulk 10 Β΅F tantalum capacitor on the board. The wide supply tolerance (4.75V-5.25V) tolerates unregulated 5V rails, but add a series ferrite bead if the supply is shared with switching logic to prevent logic-noise coupling.
The IPC suffix designates a windowless plastic DIP package - it is ONE-TIME PROGRAMMABLE in-circuit (OTP). Once programmed, the device cannot be erased. For prototyping and development, use the EP610DC-25 (CERDIP with UV-transparent window) which can be erased with a UV eraser for ~20 minutes of 254 nm radiation. Programming is performed using an Altera-compatible programmer (e.g., Altera PL-ASAP or BP-1200); verify programming timing and vector-test coverage before committing designs to OTP IPC variants in production.
Although the EP610IPC-25 is a 25 ns CMOS part, treat outputs as having TTL-edge rise/fall times (~3-5 ns) when designing high-speed buses. For buses above 10 MHz, add 33 Ξ© series damping resistors near the EP610 outputs to control ringing on long PCB traces. Inputs are TTL-compatible and include internal pull-up/pull-down biasing - check the datasheet macrocell section to determine whether unused inputs require external pull-ups to VCC to avoid floating-state current consumption.
The EP610IPC-25 in PDIP-24 package is rated for commercial temperature (0Β°C to +70Β°C). At maximum active power (~200 mW), the junction temperature rise is minimal in still air. However, in enclosed industrial cabinets with ambient temperatures approaching 70Β°C, the device should be derated. For higher-temperature environments (industrial -40Β°C to +85Β°C, military -55Β°C to +125Β°C), use the EP610IIC-25 (industrial) or EP610DM-25 (military) variants which share the same PDIP-24 footprint.
Compliance Information
PDIP-24 package contains lead; not RoHS compliant. AEC-Q100 not applicable (this is an EPLD, not an automotive-grade IC). For RoHS-compliant EPLD alternatives, consider Altera MAX II/MAX V CPLDs.
