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Microchip Technology ATF2500C-20PU
- Part No.:
- ATF2500C-20PU
- Manufacturer:
- Microchip Technology
- Package:
- 40-DIP (0.600", 15.24mm)
- Datasheet:
-
ATF2500C-20PU.pdf
- Description:
- IC CPLD 24MC 20NS 40DIP
- Quantity:
- Payment:
- Shipping:
Inventory:1,728
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Product details
Overview
ATF2500C-20PU from Atmel is a high-density, electrically-erasable programmable logic device (PLD) in a 40-pin PDIP package, delivering 15 ns pin-to-pin delay at 5V, 48 flip-flops (2 per macrocell), and full logic array connectivity with 416 product terms. It serves as a reprogrammable, secure CPLD for legacy digital control, glue logic replacement, and state machine implementation in industrial embedded systems.
For engineers reviewing the ATF2500C-20PU datasheet, ATF2500C-20PU pinout, ATF2500C-20PU application, or ATF2500C-20PU equivalent, key selection criteria include its 20 ns AC timing grade, DIP-40 through-hole compatibility, 5V CMOS operation, and backward software support for ATV2500B/BQ/H toolchains - critical for drop-in upgrades and long-life board maintenance.
Technical Context
The ATF2500C-20PU implements a single universal logic array with all 38 I/O pins and 48 register outputs fully connected to every macrocell's 17-input AND gates. Its 24 macrocells each provide three sum terms combinable into up to 12-product-term fan-in without speed penalty, enabling high gate utilization in compact designs.
Each macrocell supports independent D- or T-type flip-flop configuration, individual asynchronous reset, OE control, and selectable clocking (pin-derived or product-term). Buried combinatorial feedback (Q2 bypass) and programmable pin-keeper circuits further enhance flexibility for bus-hold and bidirectional I/O applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Density | 2500 usable gates; enables complex sequential + combinatorial logic in single 40-pin DIP |
| Pin-to-Pin Delay (tPD1) | 20 ns max at 5V; defines worst-case propagation for synchronous design timing closure |
| Register Clock-to-Output (tCOS) | 11 ns max with pin clock; sets minimum clock period for registered output paths |
| Operating Voltage | 5V ±10% (industrial range); supports legacy 5V TTL/CMOS system integration |
| Temperature Range | -40°C to +85°C; qualified for industrial-grade reliability in harsh environments |
| Package | 40-pin PDIP (40P6); compatible with wave-solder assembly and socket-based prototyping |
| Data Retention | 10 years; ensures nonvolatile configuration persistence across power cycles and storage |
Pinout & Package
ATF2500C-20PU uses a 40-pin plastic dual-inline package (PDIP, code 40P6), 0.600" wide, with standard DIP footprint and through-hole mounting. Pin 1 is marked by notch or dot; VCC = Pin 10, GND = Pin 30.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1–9, 11–19, 21–29, 31–39 | IN / I/O / CLK/IN | 38 configurable logic inputs or bidirectional I/O buffers; CLK/IN provides dedicated clock input path |
| Pin 10 | VCC | +5V supply; decoupling capacitor required adjacent to pin for noise immunity |
| Pin 30 | GND | Ground reference; must be low-impedance connection to minimize ground bounce |
| Pin 40 | NC | No connect; left unconnected per datasheet; not used for internal functions |
Key Features
| Feature | Design Value |
|---|---|
| Selectable D- or T-type flip-flops | Enables JK/SR synthesis and efficient state encoding; reduces product term usage by up to 30% vs fixed-register PLDs |
| Buried combinatorial feedback (Q2 bypass) | Feeds register output directly back to logic array without consuming I/O pins; expands effective logic capacity |
| Individual macrocell OE and asynchronous reset | Permits fine-grained output control and safe power-up initialization without external reset sequencing |
| Programmable pin-keeper circuits | Maintains last-driven state on floating I/Os; eliminates need for external pull-ups in bus-interface applications |
| Security fuse protection | Prevents unauthorized readback of JEDEC fuse pattern; essential for IP-protected firmware implementations |
Applications
| Industrial Control Logic | Legacy System Glue Logic |
|---|---|
Use Scenario: Replacing discrete TTL/SSI logic in PLC I/O modules and motor controller sequencers. IC Role / Device Role / Timing Role: Configurable state machine and address decoder implementing custom control protocols. Use Value: Reduces component count by >70% versus discrete solutions while maintaining 5V compatibility and field-reprogrammability. |
Use Scenario: Interfacing mismatched buses (e.g., ISA-to-PCI bridge logic, memory-mapped peripheral arbitration). IC Role / Device Role / Timing Role: Synchronous combinatorial translator with registered handshaking signals. Use Value: Enables timing-critical signal alignment and protocol conversion without FPGA-level complexity or cost. |
| Test Equipment Pattern Generator | Avionics Maintenance Interface |
Use Scenario: Generating deterministic stimulus waveforms and response capture logic in ATE systems. IC Role / Device Role / Timing Role: High-speed counter + sequence controller with precise 20 ns timing resolution. Use Value: Delivers deterministic, jitter-free waveform generation using internal registers and product-term clocks. |
Use Scenario: Retrofitting legacy aircraft maintenance ports (e.g., ARINC 429 interface adapters). IC Role / Device Role / Timing Role: Protocol converter and level-shifter with ESD-hardened I/O (2000V HBM). Use Value: Meets MIL-STD-883 Class B environmental requirements and provides latch-up immunity (200 mA) for mission-critical reliability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar programmable logic device applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ATF2500C-20JI | Same logic architecture and timing (20 ns), but in 44-pin PLCC (44J) package; no pin compatibility with 40P6 | Suitable for surface-mount production; requires PCB redesign due to different footprint and thermal profile | Select when migrating to SMT assembly and higher I/O count is needed. |
| ATV2500H | Lacks T-type flip-flops, pin-clocking, and D/T2 feedback; identical JEDEC fuse map for backward compatibility | Functional subset only; cannot implement advanced state machines or mixed-clock domains supported by ATF2500C-20PU | Choose only for direct replacement where existing ATV2500H designs require speed upgrade without logic recompilation. |
Compared with ATV2500H and ATF2500C-20JI, the ATF2500C-20PU uniquely combines 40-pin DIP mechanical compatibility, full feature set (T-type registers, pin-keeper, security fuse), and industrial temperature rating - making it the sole option for through-hole, field-upgradable, and IP-secured legacy system modernization.
Availability
ATF2500C-20PU is available at Aetrix Electronics and suitable for industrial control logic, legacy system glue logic, test equipment pattern generation, and avionics maintenance interface applications requiring stable component supply and long-term obsolescence management.
Supply support for ATF2500C-20PU includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Atmel Corporation (now part of Microchip Technology) is a semiconductor manufacturer specializing in microcontrollers, nonvolatile memory, and programmable logic devices for industrial, automotive, and consumer applications.
The ATF2500C-20PU belongs to Atmel's high-density electrically-erasable PLD family, designed specifically for replacing TTL/SSI logic and implementing custom control logic in 5V systems with long product lifecycles.
FAQ
What is the maximum operating frequency of the ATF2500C-20PU?
The ATF2500C-20PU supports an external feedback maximum frequency (FMAXS) of 40 MHz when using pin clocking. This is derived from its 11 ns clock-to-output (tCOS) specification and accounts for setup/hold timing margins. Internal feedback paths enable up to 50 MHz operation, and no-feedback configurations reach 71 MHz - all validated under industrial temperature conditions (-40°C to +85°C).
Is the ATF2500C-20PU pin-compatible with the ATV2500H?
No, the ATF2500C-20PU is not pin-compatible with the ATV2500H. While both are 40-pin DIP devices, the ATF2500C-20PU uses the 40P6 package with VCC on Pin 10 and GND on Pin 30, whereas the ATV2500H uses a different pinout. However, the ATF2500C-20PU supports ATV2500H JEDEC files for functional subset programming, enabling logic migration without hardware change only when using the V2500B cross-programming mode.
Does the ATF2500C-20PU support in-system programming?
The ATF2500C-20PU does not support in-system programming (ISP). It requires external parallel programming via a standard PLD programmer (e.g., Data I/O PS-200, BP Microsystems) using its 40-pin DIP socket interface. Programming is performed before soldering or in a socketed test fixture; reprogramming necessitates physical removal or socket access.
What is the purpose of the pin-keeper feature in the ATF2500C-20PU?
The pin-keeper feature in the ATF2500C-20PU provides weak active feedback latches on I/O pins to hold their last-driven logic state when un-driven. This eliminates floating inputs in bus-interface applications and avoids external pull-up/pull-down resistors. The feature is programmable via compiler device selection (e.g., V2500CPPK) and defaults to disabled for backward compatibility with ATV2500B/BQ designs.
How does the security fuse affect debugging and verification of the ATF2500C-20PU?
Once programmed, the security fuse in the ATF2500C-20PU prevents readback of the JEDEC fuse pattern and disables preload and Q2 observability modes. This blocks post-programming verification and internal register state inspection. Engineers must verify functionality fully before programming the security fuse, as no debug access remains afterward - a deliberate trade-off for intellectual property protection in production units.
ATF2500C-20PU Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- ATF2500C(L)
- Package/Case:
- 40-DIP (0.600", 15.24mm)
- Packaging:
- Tube
- Product Status:
- Active
- Programmable:
- Verified
- Programmable Type:
- In System Programmable
- Delay Time tpd(1) Max:
- 20 ns
- Voltage Supply - Internal:
- 4.5V ~ 5.5V
- Number of Logic Elements/Blocks:
- -
- Number of Macrocells:
- 24
- Number of Gates:
- -
- Number of I/O:
- 24
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 40-PDIP
ATF2500C-20PU FAQ
1.How can I place an order for ATF2500C-20PU through Aetrix?
Please submit a Request for Quotation (RFQ) for ATF2500C-20PU on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for ATF2500C-20PU reliable?
The price and inventory of ATF2500C-20PU are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ATF2500C-20PU is usually 5 days.
3.What payment methods are accepted for ATF2500C-20PU?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ATF2500C-20PU transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ATF2500C-20PU?
ATF2500C-20PU orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ATF2500C-20PU order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for ATF2500C-20PU?
For technical support, including ATF2500C-20PU datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ATF2500C-20PU requirements.
6.How does Aetrix verify that ATF2500C-20PU is sourced from the original manufacturer or authorized distributors?
All ATF2500C-20PU products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that ATF2500C-20PU meets industry standards.
7.What is the process for return or replacement of ATF2500C-20PU?
All ATF2500C-20PU units undergo pre-shipment inspection (PSI). If there is an issue with ATF2500C-20PU, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The ATF2500C-20PU part is unused and in its original packaging.
Return procedure for ATF2500C-20PU:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
ATF2500C-20PU Tags
-
5M40ZE64C5N
Intel
-
ATF1502ASV-15AU44
Microchip Technology
-
5M80ZE64C5N
Intel
-
5M80ZT100C5N
Intel
-
ATF1502AS-10AU44
Microchip Technology
-
ATF1502AS-10JU44
Microchip Technology
-
5M80ZE64I5N
Intel
-
5M80ZT100I5N
Intel
-
LC4032V-75TN48C
Lattice Semiconductor Corporation
-
ATF1504ASV-15AU44
Microchip Technology
-
ATF1504AS-10JU44
Microchip Technology
-
5M160ZE64C5N
Intel
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