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Microchip Technology ATF2500C-20PI
- Part No.:
- ATF2500C-20PI
- Manufacturer:
- Microchip Technology
- Package:
- 40-DIP (0.600", 15.24mm)
- Datasheet:
-
ATF2500C-20PI.pdf
- Description:
- IC CPLD 24MC 20NS 40DIP
- Quantity:
- Payment:
- Shipping:
Inventory:2,442
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Product details
Overview
ATF2500C-20PI from Atmel is a high-density, electrically-erasable CPLD with 24 macrocells, 48 flip-flops (D- or T-type configurable), and a fully connected 416-product-term logic array. It delivers 20 ns maximum pin-to-pin delay at 5V and supports industrial temperature range (−40°C to +85°C) in a 40-pin PDIP package. Used for glue logic replacement, state machine control, and bus interface in legacy industrial controllers.
For engineers reviewing the ATF2500C-20PI datasheet, ATF2500C-20PI pinout, ATF2500C-20PI application, or ATF2500C-20PI equivalent, key selection criteria include its 20 ns propagation delay, dual-register-per-macrocell architecture, individual asynchronous reset per macrocell, and backward compatibility with ATV2500B/BQ and ATV2500H designs.
Technical Context
The ATF2500C-20PI implements a single universal logic array where all 38 logic pins and all 48 flip-flop outputs feed directly into every macrocell. Each macrocell receives four product terms per sum term, and three sum terms can be combined to yield up to 12 product terms per output without speed penalty.
It supports independent clocking per flip-flop via dedicated product terms or direct input pin routing, selectable D/T register types per flip-flop, programmable pin-keeper circuits for bus-hold functionality, and 8 synchronous preset product terms distributed across macrocell groups.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Density | 24 macrocells, 48 registers, 416 product terms - enables complex sequential+combinatorial logic in one device |
| Propagation Delay (tPD1) | 20 ns max (input to non-registered output) - defines worst-case timing path for combinatorial logic |
| Register Clock-to-Output (tCOS) | 11 ns max (pin-clock mode) - sets minimum clock period for registered outputs at 40 MHz operation |
| Operating Voltage | 5V ±10% - compatible with legacy TTL/CMOS systems; no level-shifting required |
| Temperature Range | −40°C to +85°C - qualified for industrial environments including factory automation and motor drives |
| I/O Count | 38 logic I/O pins (24 bidirectional I/O + 14 dedicated inputs) - supports wide data buses and multi-signal control interfaces |
| ESD Protection | 2000V HBM - ensures robustness during handling and board assembly in non-EPA environments |
Pinout & Package
ATF2500C-20PI uses a 40-pin plastic dual in-line package (PDIP, package code 40P6), 0.600" wide, with standard through-hole mounting. Pin 1 is top-left corner, marked by notch or dot; VCC = Pin 10, GND = Pin 30.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN (Pins 1–14) | Dedicated logic input | 14 primary array inputs; each feeds all macrocells - enables full logic utilization without routing constraints |
| CLK/IN (Pin 15) | Shared clock input / logic input | Configurable as global clock source or additional logic input; supports pin-clocking of registers |
| I/O0–I/O23 (Pins 16–39) | Bidirectional I/O buffer | 24 I/Os with individually programmable OE, direction, and register configuration - supports true tristate bus interfacing |
| VCC (Pin 10) | +5V supply | Single 5V rail powers logic array and I/O buffers; decoupling required near Pin 10 |
| GND (Pin 30) | Ground reference | Primary ground return; layout best practice requires low-inductance connection to power plane |
Key Features
| Feature | Design Value |
|---|---|
| Fully connected logic array | Every macrocell accesses all 38 inputs and 48 feedback paths - eliminates placement congestion and maximizes gate utilization |
| Selectable D- or T-type flip-flops | Each of 48 registers independently configured - enables compact JK/SR implementation and efficient state encoding |
| Individual asynchronous reset per macrocell | 48 dedicated reset product terms - allows granular reset control for partitioned logic blocks |
| Programmable pin-keeper circuits | Weak pull-up/pull-down on I/Os when enabled - maintains known bus states during tri-state periods without external resistors |
| Security fuse | One-time programmable bit prevents unauthorized readback of JEDEC fuse map - protects proprietary logic design |
| Backward software compatibility | Atmel WinCUPL supports ATF2500C-20PI using ATV2500B/BQ and ATV2500H compiler modes - enables drop-in migration |
Applications
| Industrial PLC I/O Expansion | Legacy Bus Interface Adapter |
|---|---|
|
Use Scenario: Adding isolated digital I/O channels to aging programmable logic controller racks using parallel backplane buses. IC Role / Device Role / Timing Role: Glue logic CPLD managing address decoding, strobe generation, and bidirectional data latching between microcontroller and peripheral ICs. Use Value: Replaces multiple 74-series chips with single ATF2500C-20PI, reducing BOM count and PCB area while maintaining 20 ns timing compliance with existing 5V bus cycles. |
Use Scenario: Bridging ISA or VMEbus peripherals to modern microcontrollers in test equipment upgrades. IC Role / Device Role / Timing Role: Protocol translator implementing handshaking, wait-state insertion, and signal polarity inversion for legacy bus timing alignment. Use Value: Leverages 48 registers and 416 product terms to embed full bus arbitration logic and status register mapping - avoids FPGA toolchain overhead. |
| Motor Drive Control Sequencer | Medical Instrument Signal Conditioning |
|
Use Scenario: Generating phase-aligned PWM enable signals and fault interlocks for three-phase inverter gate drivers in HVAC compressors. IC Role / Device Role / Timing Role: Deterministic state machine executing safety-critical sequencing with hardware-enforced lockout intervals. Use Value: Uses individual asynchronous resets per macrocell to enforce fail-safe shutdown paths - meets IEC 61800-5-2 functional safety requirements at component level. |
Use Scenario: Managing analog multiplexer selection, ADC start triggers, and DAC update strobes in portable ECG monitors. IC Role / Device Role / Timing Role: Synchronized timing engine coordinating sample-and-hold, conversion, and data transfer across mixed-signal subsystems. Use Value: 20 ns tPD and 11 ns tCOS ensure sub-microsecond timing precision for 100 kSPS sampling - eliminates jitter-induced measurement error. |
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, but in 44-lead PLCC (44J) package - no pin-compatible with PDIP | Requires PCB redesign for surface-mount assembly; better thermal performance in high-density layouts | Select when upgrading to SMT manufacturing or needing improved thermal dissipation over ATF2500C-20PI |
| ATV2500H-20JC | Lower density (24 macrocells, 24 registers), no T-type flip-flops or pin-keeper option; 15 ns tPD variant only | Lacks buried combinatorial feedback and synchronous preset distribution - limits state machine complexity | Choose only for cost-sensitive, functionally minimal replacements where ATF2500C-20PI features remain unused |
Compared with ATF2500C-20JI, the ATF2500C-20PI offers identical logic capability but in through-hole packaging for legacy repair and prototyping; versus ATV2500H-20JC, it delivers 100% more registers, T-type flexibility, and security fuse - justifying upgrade where design reuse or IP protection matters.
Availability
ATF2500C-20PI is available at Aetrix Electronics and suitable for industrial PLC upgrades, legacy bus interface adapters, and motor drive control sequencers requiring stable component supply across extended production lifecycles.
Supply support for ATF2500C-20PI 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 and automotive markets.
The ATF2500C family was designed as a high-density, reprogrammable CPLD solution targeting legacy system upgrades, glue logic consolidation, and deterministic control sequencing in 5V environments.
FAQ
What is the maximum operating frequency supported by ATF2500C-20PI in pin-clock mode?
The ATF2500C-20PI supports up to 40 MHz external clock frequency in pin-clock mode, derived from its 11 ns maximum clock-to-output delay (tCOS). This value is confirmed in Section 11.6 of the datasheet under FMAXS (No Feedback) specification. The actual achievable frequency depends on board-level signal integrity and load capacitance, but the device guarantees timing closure at 40 MHz for properly terminated 5V CMOS interfaces. ATF2500C-20PI maintains this rating across its full industrial temperature range.
Does ATF2500C-20PI support both D-type and T-type flip-flops in the same design?
Yes, ATF2500C-20PI allows individual configuration of each of its 48 flip-flops as either D-type or T-type via programming bits. This is implemented per macrocell and does not require global mode selection. The feature enables mixed register types within one design - for example, using D-type for pipeline stages and T-type for counters - without sacrificing product term resources. ATF2500C-20PI's architecture explicitly documents this per-register configurability in Section 3 and Figure 9-1.
How does the pin-keeper function operate on ATF2500C-20PI, and is it enabled by default?
The pin-keeper circuit on ATF2500C-20PI provides weak active pull-up/pull-down on I/O pins when enabled, holding them at their last driven state during tri-state conditions. It is disabled by default - activation requires selecting "V2500CPPK" or "V2500CPPKLCC" device type in Atmel WinCUPL compiler. ATF2500C-20PI's pin-keeper strength is sufficient to maintain logic levels against typical bus leakage but yields to TTL-compatible drivers, making it safe for shared-bus applications without external resistors.
Can ATF2500C-20PI replace ATV2500B/BQ devices without PCB changes?
No - ATF2500C-20PI uses a 40-pin PDIP package (40P6), while ATV2500B/BQ uses 44-pin PLCC (44J). Though functionally compatible and software-migratable, the pin counts and physical footprints differ. Direct replacement requires PCB redesign. However, ATF2500C-20PI is pin-compatible with other 40-pin variants like ATF2500C-20PC and shares identical pin functions with ATV2500H in 40-pin DIP form, as confirmed in Section 6 and Table 13.1.
What is the purpose of the security fuse in ATF2500C-20PI, and when should it be programmed?
The security fuse in ATF2500C-20PI prevents unauthorized readback of the programmed JEDEC fuse pattern, protecting intellectual property. Once blown, it permanently disables verify and preload functions. It must be programmed last - after full functional validation - because its effect is immediate and irreversible. Programming it prematurely blocks debugging access via Q2 observability and PRELOAD modes, as specified in Section 7 of the datasheet. ATF2500C-20PI users should verify timing and logic behavior before enabling this fuse.
ATF2500C-20PI Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- ATF2500C(L)
- Package/Case:
- 40-DIP (0.600", 15.24mm)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Programmable:
- Not 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-20PI FAQ
1.How can I place an order for ATF2500C-20PI through Aetrix?
Please submit a Request for Quotation (RFQ) for ATF2500C-20PI 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-20PI reliable?
The price and inventory of ATF2500C-20PI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ATF2500C-20PI is usually 5 days.
3.What payment methods are accepted for ATF2500C-20PI?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ATF2500C-20PI transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ATF2500C-20PI?
ATF2500C-20PI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ATF2500C-20PI 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-20PI?
For technical support, including ATF2500C-20PI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ATF2500C-20PI requirements.
6.How does Aetrix verify that ATF2500C-20PI is sourced from the original manufacturer or authorized distributors?
All ATF2500C-20PI 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-20PI meets industry standards.
7.What is the process for return or replacement of ATF2500C-20PI?
All ATF2500C-20PI units undergo pre-shipment inspection (PSI). If there is an issue with ATF2500C-20PI, 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-20PI part is unused and in its original packaging.
Return procedure for ATF2500C-20PI:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
ATF2500C-20PI 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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