Send an Inquiry

To receive a quote for your project, please fill in the following information, and we’ll get back to you promptly.

Submit Inventory List

Please fill in the following information, and we’ll get back to you promptly.

Home > Products > Integrated Circuits (ICs) > Embedded > CPLDs (Complex Programmable Logic Devices)

Microchip Technology ATF1508ASL-25JI84

Name: ATF1508ASL-25JI84
Brand: Microchip Technology
SKU: ATF1508ASL-25JI84
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

Compare

Part No.:: ATF1508ASL-25JI84

Manufacturer:: Microchip Technology

Category:: CPLDs (Complex Programmable Logic Devices)

Package:: 84-LCC (J-Lead)

Datasheet:: ATF1508ASL-25JI84.pdf

Description:: IC CPLD 128MC 25NS 84PLCC

Quantity:: RFQ Add To RFQ list

Payment:

Shipping:

Inventory:3,528

Please send an inquiry. Send us your inquiry, and we will respond immediately.

Product details

Overview

ATF1508ASL-25JI84 from Microchip Technology (formerly Atmel) is a high-density, electrically-erasable Complex Programmable Logic Device (CPLD) with 128 macrocells, 5 product terms per macrocell expandable to 40, 7.5 ns pin-to-pin delay, and operation up to 125 MHz. It features three global clock inputs, JTAG boundary-scan (IEEE 1149.1), in-system programmability, and PCI-compliant I/O drivers - used in legacy industrial control logic consolidation and FPGA prototyping support.

For engineers reviewing the ATF1508ASL-25JI84 datasheet, ATF1508ASL-25JI84 pinout, ATF1508ASL-25JI84 application, or ATF1508ASL-25JI84 equivalent, key selection criteria include its 84-pin PLCC package, 5 V internal core supply (VCCINT), dual-voltage I/O (3.3 V/5.0 V), automatic 10 µA standby mode, and JTAG-enabled field reprogrammability without board removal.

Technical Context

The ATF1508ASL-25JI84 implements a hierarchical CPLD architecture with 128 flexible macrocells, each supporting D/T/latch flip-flops, programmable output slew rate, open-collector option, and buried registered feedback within combinatorial outputs. Its global bus carries all 100+ input/I/O signals plus macrocell feedback, feeding switch matrices that select up to 40 signals per logic block.

It integrates IEEE 1149.1-compliant boundary-scan testing, fast ISP via TDI/TDO/TCK/TMS pins, PCI-compliant drive strength (±44 mA AC high, +206 mA AC low), and power management including pin-controlled power-down (PD1/PD2), individual macrocell reduced-power bits, and programmable pin-keeper circuits for floating I/O stabilization.

Key Specifications

Parameter	Value and Actual Design Meaning
Macrocell Count	128 - provides gate-equivalent logic density sufficient to replace multiple 74-series TTL/MSI devices or classic PLDs in glue logic applications.
Pin-to-pin Delay	7.5 ns - enables reliable operation in 125 MHz registered systems with timing margin for PCB trace delays and signal integrity.
Max Clock Frequency	125 MHz - supports high-speed synchronous logic such as state machines, bus controllers, and interface protocol engines.
I/O Voltage Support	3.3 V or 5.0 V - allows direct interfacing with mixed-voltage systems without level shifters; VCCIO pins are separately powered.
Standby Current	10 µA (L-version) - enables ultra-low-power operation during system idle states without external power gating circuitry.
JTAG Compliance	IEEE Std. 1149.1-1990 & 1149.1a-1993 - guarantees interoperability with standard boundary-scan test equipment and debug tools.
PCI Compliance	Fully compliant - meets PCI Local Bus Specification drive requirements including ±44 mA AC high sink and +206 mA AC low source at 0.71 V.

Pinout & Package

ATF1508ASL-25JI84 is packaged in an 84-lead Plastic Leaded Chip Carrier (PLCC) with J-lead geometry, lead pitch of 0.05 inches (1.27 mm), and body size 1.170 × 1.170 inches (29.72 × 29.72 mm). The package is RoHS-compliant, Pb-free, and rated for industrial temperature range (–40°C to +85°C).

Pin/Terminal	Circuit Role	Design Meaning
1, 84	I/O/PD1	Dedicated power-down control input; when asserted high (with PD feature enabled), forces device into sub-10 mA power-down state while latching all internal logic and outputs.
3, 82	I/O/TDI	JTAG Test Data Input - serial input for boundary-scan instruction/data; also usable as general-purpose I/O if JTAG disabled.
12, 73	I/O/TMS	JTAG Test Mode Select - controls TAP controller state transitions; pull-up option configurable in design file.
25, 60	I/O/TDO	JTAG Test Data Output - serial output for boundary-scan data; high-impedance when not active; no external pull required.
26, 59	I/O/TCK	JTAG Test Clock - synchronous clock for scan operations; must be driven externally; tolerant of 5 V logic levels.
4, 5, 6, 7, 8, 9, 10, 11, 13–24, 27–32, 34–40, 42–58, 61–72, 74–83	I/O	Bi-directional user I/O pins - individually configurable as input, output, or bidirectional; support slew rate control, open-collector mode, and pin-keeper function.
14, 33, 41, 50, 69, 78	VCCIO	I/O power supply pins - must be connected to either 3.3 V or 5.0 V; decoupling capacitors required per pin for noise suppression.
39, 54, 64	GND	Ground reference pins - provide return paths for I/O and internal logic; multiple GND pins minimize ground bounce and improve signal integrity.
44, 55	VCCINT	Core logic power supply - must be connected to 5.0 V ±5%; powers input buffers and macrocell logic; not compatible with 3.3 V.
20, 45, 70	INPUT/GCLK1–3	Global clock inputs - asynchronous clock sources for register clocks; support ITD (input transition detection) for edge-sensitive wake-up.
19, 46	INPUT/OE1–2	Global output enable inputs - control tri-state behavior across groups of I/Os; can be inverted or combined with product terms.
18	INPUT/GCLR	Global clear input - asynchronous reset for all registers; may be OR'd with product term for conditional reset functionality.

Key Features

Feature	Design Value
Programmable Pin-keeper	Prevents floating I/Os by holding last-driven logic state - eliminates need for external pull-up/down resistors and associated DC power loss.
Three Global Clock Pins	Enables independent clock domains for partitioned logic blocks - supports multi-clock domain designs like PCI-to-legacy bus bridges.
Input Transition Detection (ITD)	Allows wake-up from low-power mode on signal edges at GCLK, INPUT, or I/O pins - critical for battery-backed industrial monitoring nodes.
Combinatorial Output with Registered Feedback	Permits dual-latch behavior inside single macrocell - reduces resource usage in sequential logic with feedback paths (e.g., counters, shift registers).
PCI-Compliant Drive Strength	Meets PCI Local Bus v2.2 sink/source requirements - enables direct connection to PCI slots without external bus transceivers.
Security Fuse Protection	Blocks unauthorized readback of configuration bitstream - preserves IP in deployed systems where physical access cannot be fully controlled.

Applications

Industrial PLC I/O Expansion	Legacy System Glue Logic Replacement
Use Scenario: Adding isolated digital I/O channels to programmable logic controllers using existing 5 V backplane infrastructure. IC Role / Device Role / Timing Role: CPLD implementing parallel I/O expansion logic with debounce, edge detection, and register-based status reporting. Use Value: Replaces 8–12 discrete TTL packages; leverages 128 macrocells and 7.5 ns delay to meet <100 ns cycle-time requirements in deterministic motion control loops.	Use Scenario: Consolidating address decoding, bus arbitration, and handshake logic in aging test equipment using obsolete 74-series components. IC Role / Device Role / Timing Role: High-density logic integrator providing synchronous control of ISA-compatible peripherals with precise setup/hold timing. Use Value: Achieves full replacement of >15 SSI/MSI ICs; uses programmable slew rate and pin-keeper to maintain signal integrity on long, unterminated traces.
PCI Interface Adapter	Field-Upgradeable Firmware Controller
Use Scenario: Bridging custom ASICs to PCI bus in embedded instrumentation requiring hot-plug compatibility and burst transfers. IC Role / Device Role / Timing Role: PCI target interface controller managing command decode, data multiplexing, and parity generation with strict timing compliance. Use Value: Meets PCI AC specs (±44 mA IOH, +206 mA IOL) without external drivers; JTAG ISP enables firmware updates without disassembly.	Use Scenario: Managing boot sequence, configuration loading, and fail-safe recovery in medical imaging subsystems with strict regulatory uptime requirements. IC Role / Device Role / Timing Role: Secure, reprogrammable state machine coordinating flash memory access, watchdog supervision, and hardware reset coordination. Use Value: Security fuse prevents tampering; automatic 10 µA standby extends battery life during standby; power-down mode reduces leakage during sleep cycles.

Industrial PLC I/O Expansion

Legacy System Glue Logic Replacement

Use Scenario: Adding isolated digital I/O channels to programmable logic controllers using existing 5 V backplane infrastructure.

IC Role / Device Role / Timing Role: CPLD implementing parallel I/O expansion logic with debounce, edge detection, and register-based status reporting.

Use Value: Replaces 8–12 discrete TTL packages; leverages 128 macrocells and 7.5 ns delay to meet <100 ns cycle-time requirements in deterministic motion control loops.

Use Scenario: Consolidating address decoding, bus arbitration, and handshake logic in aging test equipment using obsolete 74-series components.

IC Role / Device Role / Timing Role: High-density logic integrator providing synchronous control of ISA-compatible peripherals with precise setup/hold timing.

Use Value: Achieves full replacement of >15 SSI/MSI ICs; uses programmable slew rate and pin-keeper to maintain signal integrity on long, unterminated traces.

PCI Interface Adapter

Field-Upgradeable Firmware Controller

Use Scenario: Bridging custom ASICs to PCI bus in embedded instrumentation requiring hot-plug compatibility and burst transfers.

IC Role / Device Role / Timing Role: PCI target interface controller managing command decode, data multiplexing, and parity generation with strict timing compliance.

Use Value: Meets PCI AC specs (±44 mA IOH, +206 mA IOL) without external drivers; JTAG ISP enables firmware updates without disassembly.

Use Scenario: Managing boot sequence, configuration loading, and fail-safe recovery in medical imaging subsystems with strict regulatory uptime requirements.

IC Role / Device Role / Timing Role: Secure, reprogrammable state machine coordinating flash memory access, watchdog supervision, and hardware reset coordination.

Use Value: Security fuse prevents tampering; automatic 10 µA standby extends battery life during standby; power-down mode reduces leakage during sleep cycles.

Equivalent & Alternatives

The following parts are listed as comparable options for similar CPLD applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
ATF1508AS-25JU84	Same architecture and macrocell count, but in 84-pin PLCC with commercial temp range (0°C to 70°C); lacks automatic 10 µA standby - uses 160 mA typical ICC1.	Suitable only for non-industrial environments; cannot replace ATF1508ASL-25JI84 in systems requiring sub-100 µA quiescent current or extended temperature operation.	Select only if cost sensitivity outweighs industrial reliability and ultra-low-power needs.
XC95144XL-10TQ100C	Xilinx CoolRunner-II CPLD with 144 macrocells, 100-pin TQFP, 3.3 V core/I/O, and 5 ns tPD; no PCI compliance or VCCINT/VCCIO separation.	Requires level-shifting for 5 V legacy interfaces; lacks dedicated PD pins and ITD circuits; incompatible with existing 84-pin PLCC footprint.	Consider only for new 3.3 V designs prioritizing lower static power over pin compatibility and mixed-voltage support.

Compared with ATF1508AS-25JU84, the ATF1508ASL-25JI84 delivers 4× lower standby current and extended temperature tolerance, making it essential for ruggedized deployments; versus XC95144XL-10TQ100C, it retains native 5 V PCI signaling and PLCC socket compatibility but trades higher static power for broader legacy integration capability.

Availability

ATF1508ASL-25JI84 is available at Aetrix Electronics and suitable for industrial PLC I/O expansion, legacy system glue logic replacement, and PCI interface adapter applications requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant sourcing.

Supply support for ATF1508ASL-25JI84 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

Microchip Technology acquired Atmel in 2016 and maintains full support for legacy Atmel PLD products including the ATF1508AS family. Microchip is a global leader in microcontrollers, analog, and programmable logic solutions.

The ATF1508AS series was designed for high-reliability, field-upgradeable logic consolidation in industrial, telecom, and military-aerospace systems - emphasizing in-system programmability, mixed-voltage I/O, and robust power management.

FAQ

What is the operating temperature range for the ATF1508ASL-25JI84?

The ATF1508ASL-25JI84 is rated for industrial temperature operation from –40°C to +85°C. This is confirmed by its "I" suffix in the part number and verified in the DC operating conditions table (page 14 of Rev. 0784P–PLD–7/05), where VCCIO and ICC specifications are explicitly defined across this full range.

Does the ATF1508ASL-25JI84 support both 3.3 V and 5.0 V I/O simultaneously?

Yes - the ATF1508ASL-25JI84 supports mixed-voltage I/O via separate VCCIO and VCCINT supplies. VCCINT must be 5.0 V for core logic, while VCCIO pins may be independently set to either 3.3 V or 5.0 V, enabling simultaneous interfacing with 3.3 V and 5.0 V peripherals on different I/O banks.

How does the power-down mode work on the ATF1508ASL-25JI84?

The ATF1508ASL-25JI84 supports pin-controlled power-down using PD1 (pin 1) or PD2 (pin 84). When enabled in the design file and asserted high, it reduces supply current to <10 mA while latching all internal states and outputs. Inputs other than PD pins are blocked, and pin-keeper circuits remain active to prevent floating.

Is the ATF1508ASL-25JI84 pin-compatible with other ATF1508AS variants?

Yes - the ATF1508ASL-25JI84 shares identical 84-pin PLCC pinout and electrical characteristics with all other ATF1508AS(L) variants in the same package (e.g., ATF1508AS-25JU84). Differences are limited to temperature grade, standby current behavior, and security fuse programming - no PCB layout changes are needed for substitution within the same package type.

What JTAG standards does the ATF1508ASL-25JI84 comply with?

The ATF1508ASL-25JI84 complies with IEEE Std. 1149.1-1990 and 1149.1a-1993 for boundary-scan testing. It implements full SAMPLE/PRELOAD, EXTEST, BYPASS, and IDCODE instructions, and ships with BSDL models conforming to the standard - verified in the JTAG-BST Overview section (page 9) and BSDL Models note (page 10).

ATF1508ASL-25JI84 Specifications

Product attributes: Attribute value

Manufacturer:: Microchip Technology

Series:: ATF15xx

Package/Case:: 84-LCC (J-Lead)

Packaging:: Tube

Product Status:: Obsolete

Programmable:: Not Verified

Programmable Type:: In System Programmable (min 10K program/erase cycles)

Delay Time tpd(1) Max:: 25 ns

Voltage Supply - Internal:: 4.5V ~ 5.5V

Number of Logic Elements/Blocks:: -

Number of Macrocells:: 128

Number of Gates:: -

Number of I/O:: 64

Operating Temperature:: -40°C ~ 85°C (TA)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 84-PLCC (29.31x29.31)

ATF1508ASL-25JI84 FAQ

1.How can I place an order for ATF1508ASL-25JI84 through Aetrix?

Please submit a Request for Quotation (RFQ) for ATF1508ASL-25JI84 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 ATF1508ASL-25JI84 reliable?

The price and inventory of ATF1508ASL-25JI84 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ATF1508ASL-25JI84 is usually 5 days.

3.What payment methods are accepted for ATF1508ASL-25JI84?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ATF1508ASL-25JI84 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for ATF1508ASL-25JI84?

ATF1508ASL-25JI84 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your ATF1508ASL-25JI84 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 ATF1508ASL-25JI84?

For technical support, including ATF1508ASL-25JI84 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ATF1508ASL-25JI84 requirements.

6.How does Aetrix verify that ATF1508ASL-25JI84 is sourced from the original manufacturer or authorized distributors?

All ATF1508ASL-25JI84 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 ATF1508ASL-25JI84 meets industry standards.

7.What is the process for return or replacement of ATF1508ASL-25JI84?

All ATF1508ASL-25JI84 units undergo pre-shipment inspection (PSI). If there is an issue with ATF1508ASL-25JI84, 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 ATF1508ASL-25JI84 part is unused and in its original packaging.

Return procedure for ATF1508ASL-25JI84:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

Tech Hub

2026-09-07 TTL vs CMOS Logic Levels: 74HC and 74HCT Compatibility Explained

TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.

2026-09-04 Logic Level Shifter: How to Connect 3.3V and 5V Logic Safely

A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.

2026-09-03 74HC595 vs TPIC6B595: Output Drive, Pinout, Current, and Load Selection

The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…

2026-09-02 74HC595 Pinout, Timing, Output Current, and Applications

The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…

2026-09-01 Latch vs Flip-Flop: Timing, Differences and Design Choices

A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…

2026-08-30 D Latch Circuit: Truth Table, Timing, ICs and Applications

A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …

2026-08-28 SR Latch Explained: NOR and NAND Circuits, Truth Tables, and Applications

An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…

2026-08-27 Latch Circuit: SR and D Latches, Truth Tables, Timing, and Applications

Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…

2026-08-21 What Is an LED Driver? Types, Circuits, Dimming, and Selection

An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…

2026-08-18 Operational Amplifier (Op Amp): Basics, Configurations, Feedback and Applications

Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…