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

Microchip Technology ATF1508AS-15JC84

Name: ATF1508AS-15JC84
Brand: Microchip Technology
SKU: ATF1508AS-15JC84
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: ATF1508AS-15JC84

Manufacturer:: Microchip Technology

Category:: CPLDs (Complex Programmable Logic Devices)

Package:: 84-LCC (J-Lead)

Datasheet:: ATF1508AS-15JC84.pdf

Description:: IC CPLD 128MC 15NS 84PLCC

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Product details

Overview

ATF1508AS-15JC84 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 JTAG boundary-scan (IEEE 1149.1), in-system programmability, PCI compliance, and flexible I/O with 3.3 V or 5.0 V support - used in industrial control logic consolidation and legacy TTL replacement.

For engineers reviewing the ATF1508AS-15JC84 datasheet, ATF1508AS-15JC84 pinout, ATF1508AS-15JC84 application, or ATF1508AS-15JC84 equivalent, key selection criteria include its 84-pin PLCC package, dual VCCINT/VCCIO power domains, programmable slew rate and open-collector outputs, pin-keeper functionality, and support for power-down modes via PD1/PD2 pins.

Technical Context

The ATF1508AS-15JC84 implements a hierarchical CPLD architecture with eight logic chains, each supporting up to 40-product-term sum-of-products logic via cascade paths. Its global bus carries all 100+ input/I/O signals plus buried macrocell feedback, while each logic block selects up to 40 signals via software-configurable switch matrices.

Each of its 128 macrocells integrates a configurable flip-flop (D/T/latch), XOR/OR/CASCADE logic, product term select multiplexer, and output enable control. The device supports registered or combinatorial outputs, buried registered feedback within combinatorial macrocells, and ITD (Input Transition Detection) on global clocks, inputs, and I/Os.

Key Specifications

Parameter	Value and Actual Design Meaning
Logic Density	128 macrocells - provides gate count equivalent to ~2,000 usable PLD gates for medium-complexity glue logic integration.
Propagation Delay	7.5 ns max pin-to-pin - enables reliable operation in 125 MHz registered systems with timing margin for PCB trace delays.
Operating Voltage	VCCINT = 5.0 V (fixed), VCCIO = 3.3 V or 5.0 V - allows mixed-voltage board interfacing without level shifters.
I/O Count	Up to 96 bi-directional I/O + 4 dedicated inputs - supports large state machines and wide data buses in compact PLCC footprint.
Power Management	10 µA standby (L-version), pin-controlled 1 mA power-down, per-macrocell reduced-power bit - cuts dynamic and static power in battery-sensitive or thermally constrained designs.
JTAG Compliance	IEEE Std. 1149.1-1990/1149.1a-1993 - enables boundary-scan testing, in-system programming, and BSDL-based validation without external programmers.
PCI Compliance	Fully compliant with PCI DC/AC specs - delivers ±44 mA high-current drive and meets VOL/VOH, slew rate, and clamp current requirements for add-in card logic.

Pinout & Package

ATF1508AS-15JC84 is packaged in an 84-lead Plastic Leaded Chip Carrier (PLCC) with J-lead profile, 1.27 mm pitch, and body size 29.31 mm × 29.31 mm. Pin 1 is marked by corner notch; top view shown in datasheet Rev. 0784P–PLD–7/05.

Pin/Terminal	Circuit Role	Design Meaning
1, 84, 43, 44	GND	Four dedicated ground pins - reduce ground bounce and improve noise immunity across high-speed switching I/O banks.
11, 22, 33, 45, 56, 67, 78	VCCIO	I/O power supply pins - must be tied to same 3.3 V or 5.0 V rail; decoupling required per bank for signal integrity.
32, 53	VCCINT	Core logic power supply - fixed 5.0 V only; powers input buffers and internal logic; requires low-noise regulation.
13, 14, 15, 16, 17, 18, 19, 20, 21, 23, 24, 25, 26, 27, 28, 29, 30, 31, 34, 35, 36, 37, 38, 39, 40, 41, 42, 46, 47, 48, 49, 50, 51, 52, 54, 55, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 79, 80, 81, 82, 83	I/O	Bi-directional logic I/O - individually configurable as input, output, or bidirectional; supports programmable slew rate and open-collector mode.
4, 5, 6, 7	INPUT/GCLR, INPUT/OE1, INPUT/GCLK1, INPUT/GCLK2	Dedicated global control inputs - serve as global clear, output enable, and clock sources; each can be routed to any macrocell.
8, 9	I/O/GCLK3, I/O/PD2	Multi-function pins - GCLK3 is third global clock; PD2 enables pin-controlled power-down when asserted high.
12, 23, 34, 45	I/O/TDI, I/O/TMS, I/O/TDO, I/O/TCK	JTAG interface pins - implement IEEE 1149.1 TAP controller; TMS/TDI have optional internal pull-ups; disable JTAG to reclaim as I/O.
10, 21, 32, 43	I/O/PD1, GND, VCCINT, GND	PD1 enables second power-down control; VCCINT and GND pins are critical for core logic stability and thermal management.

Key Features

Feature	Design Value
Programmable Pin-keeper	Maintains last-driven logic state on floating inputs/I/Os - eliminates need for external pull-ups and prevents system noise from indeterminate levels.
Buried Registered Feedback	Enables latching within combinatorial macrocell outputs - supports dual-edge-triggered logic and compact state machine implementation without extra macrocells.
Per-Macrocell Reduced-power Bit	Disables unused logic paths and reduces dynamic switching - lowers ICC by up to 50% in partial-utilization designs without timing penalty.
ITD Circuits on Global Clocks & I/O	Detects input transitions independent of clock edge - enables asynchronous event capture and low-latency interrupt generation in real-time control.
Three Global Clock Pins	Supports multi-clock domain designs - allows independent clocking of logic blocks for pipelined architectures or isolated subsystem timing.
Security Fuse + User Signature	Prevents unauthorized readback; two bytes (16 bits) remain readable for project ID/revision tracking regardless of fuse state.

Applications

Industrial PLC I/O Expansion	Legacy System Glue Logic Replacement
Use Scenario: Replacing discrete TTL/SSI logic in programmable logic controller backplanes to consolidate address decoding, interrupt arbitration, and status multiplexing. IC Role / Device Role / Timing Role: CPLD acting as reconfigurable glue logic hub with deterministic 7.5 ns propagation and PCI-compliant drive strength for ISA/PCI bus interfacing. Use Value: Reduces BOM count by >15 components per module, eliminates solder joint failure points, and enables field-upgradable logic via JTAG ISP.	Use Scenario: Modernizing aging test equipment control boards where original PAL/GAL devices are obsolete and no longer supported. IC Role / Device Role / Timing Role: Drop-in functional replacement for 22V10/16V8-style logic with expanded macrocell count and enhanced routing for pin-locked redesigns. Use Value: Maintains identical PLCC-84 footprint and pinout while adding JTAG debug visibility, power-down capability, and 20-year data retention.
PCI Add-in Card Control Logic	Automated Test Equipment (ATE) Pattern Generator
Use Scenario: Implementing configuration registers, bus arbitration, and IDSEL decoding in PCI-compliant instrumentation cards. IC Role / Device Role / Timing Role: PCI-compliant CPLD providing IDSEL response, command decode, and reset synchronization with guaranteed VOL ≤ 0.55 V at 6 mA sink. Use Value: Meets PCI specification without external buffer ICs; supports hot-plug detection via ITD circuits on slot detect lines.	Use Scenario: Generating synchronized stimulus waveforms and capture masks in high-speed digital ATE platforms requiring sub-10 ns timing resolution. IC Role / Device Role / Timing Role: High-speed registered logic engine delivering deterministic 125 MHz pattern rates with programmable slew control to minimize crosstalk on dense probe cards. Use Value: Enables on-board pattern modification without FPGA toolchain overhead; JTAG BSDL support simplifies automated test program generation.

Industrial PLC I/O Expansion

Legacy System Glue Logic Replacement

Use Scenario: Replacing discrete TTL/SSI logic in programmable logic controller backplanes to consolidate address decoding, interrupt arbitration, and status multiplexing.

IC Role / Device Role / Timing Role: CPLD acting as reconfigurable glue logic hub with deterministic 7.5 ns propagation and PCI-compliant drive strength for ISA/PCI bus interfacing.

Use Value: Reduces BOM count by >15 components per module, eliminates solder joint failure points, and enables field-upgradable logic via JTAG ISP.

Use Scenario: Modernizing aging test equipment control boards where original PAL/GAL devices are obsolete and no longer supported.

IC Role / Device Role / Timing Role: Drop-in functional replacement for 22V10/16V8-style logic with expanded macrocell count and enhanced routing for pin-locked redesigns.

Use Value: Maintains identical PLCC-84 footprint and pinout while adding JTAG debug visibility, power-down capability, and 20-year data retention.

PCI Add-in Card Control Logic

Automated Test Equipment (ATE) Pattern Generator

Use Scenario: Implementing configuration registers, bus arbitration, and IDSEL decoding in PCI-compliant instrumentation cards.

IC Role / Device Role / Timing Role: PCI-compliant CPLD providing IDSEL response, command decode, and reset synchronization with guaranteed VOL ≤ 0.55 V at 6 mA sink.

Use Value: Meets PCI specification without external buffer ICs; supports hot-plug detection via ITD circuits on slot detect lines.

Use Scenario: Generating synchronized stimulus waveforms and capture masks in high-speed digital ATE platforms requiring sub-10 ns timing resolution.

IC Role / Device Role / Timing Role: High-speed registered logic engine delivering deterministic 125 MHz pattern rates with programmable slew control to minimize crosstalk on dense probe cards.

Use Value: Enables on-board pattern modification without FPGA toolchain overhead; JTAG BSDL support simplifies automated test program generation.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
ATF1508AS-10JC84	10 ns max propagation delay (vs. 7.5 ns); same 128-macrocell architecture and PLCC-84 package.	Suitable for lower-speed industrial interfaces where timing margin exceeds 2.5 ns; consumes slightly less dynamic power at equivalent frequency.	Select when design timing slack permits relaxed delay spec and cost sensitivity favors standard speed grade.
ATF1508ASL-15JC84	"L" version adds automatic 10 µA standby mode (vs. pin-controlled 1 mA in ATF1508AS-15JC84); identical AC/DC specs otherwise.	Better suited for battery-backed or energy-harvesting systems requiring ultra-low quiescent current during idle periods.	Choose for applications demanding lowest possible standby power without sacrificing 7.5 ns performance or PLCC-84 compatibility.

Compared with ATF1508AS-15JC84, the -10JC84 trades 2.5 ns speed for lower cost and marginally reduced power, while the -15JC84L adds autonomous low-power entry - both retain full pin, macrocell, and JTAG compatibility but differ in power-state activation method and timing ceiling.

Availability

ATF1508AS-15JC84 is available at Aetrix Electronics and suitable for industrial PLC upgrades, PCI add-in card development, and legacy TTL replacement requiring stable component supply, long-lifecycle support, and RoHS-compliant packaging.

Supply support for ATF1508AS-15JC84 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 the ATF1508AS family, including datasheets, BSDL models, and legacy programming tools.

The ATF1508AS series was designed for high-reliability industrial and communications equipment requiring in-system programmability, PCI compliance, and long-term obsolescence resilience - targeting logic consolidation in space-constrained, thermally demanding environments.

FAQ

What is the maximum operating frequency of the ATF1508AS-15JC84?

The ATF1508AS-15JC84 supports registered operation up to 125 MHz, verified under worst-case conditions (VCC = 4.75 V, TA = 85°C). This frequency is achievable due to its 7.5 ns pin-to-pin delay and optimized routing resources. The actual system clock rate depends on logic depth and placement; timing analysis using Atmel WinCUPL or third-party tools is required to confirm closure in a given design. ATF1508AS-15JC84 does not guarantee 125 MHz across all macrocell configurations.

Does the ATF1508AS-15JC84 support both 3.3 V and 5.0 V I/O simultaneously?

Yes - the ATF1508AS-15JC84 uses separate VCCIO and VCCINT supplies: VCCINT must be 5.0 V (±5%), while VCCIO can be independently set to either 3.3 V (2.7–3.6 V) or 5.0 V (4.75–5.25 V). This allows mixed-voltage operation on the same device, such as interfacing with 3.3 V microcontrollers and 5.0 V legacy peripherals. All I/O pins share the same VCCIO rail; split-rail I/O is not supported.

How does the power-down mode work on the ATF1508AS-15JC84?

The ATF1508AS-15JC84 supports pin-controlled power-down via PD1 (Pin 10) or PD2 (Pin 8): when either is driven high, internal logic states and outputs are latched, supply current drops below 10 mA, and all inputs except PD pins are ignored. The feature is enabled in the design file; once active, the PD pin cannot serve as logic I/O. ATF1508AS-15JC84 retains output validity and pin-keeper behavior during power-down to prevent floating nodes.

Can the JTAG pins of the ATF1508AS-15JC84 be used as general-purpose I/O?

Yes - the four JTAG pins (TCK, TMS, TDI, TDO) are configurable as general-purpose I/O when JTAG boundary-scan and ISP functions are disabled in the design file. Disabling JTAG frees all four pins for logic use but removes in-system programming and boundary-scan test capability. The ATF1508AS-15JC84 does not require external pull-ups on TMS/TDI if internal pull-ups are enabled during configuration.

Is the ATF1508AS-15JC84 RoHS compliant and lead-free?

Yes - the ATF1508AS-15JC84 is offered in green (Pb/Halide-free/RoHS-compliant) package options, including the 84-lead PLCC variant. It meets EU RoHS Directive 2011/65/EU and JEDEC J-STD-609 moisture sensitivity level (MSL) requirements. The device has 2000 V HBM ESD protection and 200 mA latch-up immunity, ensuring robustness in industrial handling and assembly environments.

ATF1508AS-15JC84 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:: 15 ns

Voltage Supply - Internal:: 4.75V ~ 5.25V

Number of Logic Elements/Blocks:: -

Number of Macrocells:: 128

Number of Gates:: -

Number of I/O:: 64

Operating Temperature:: 0°C ~ 70°C (TA)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

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

ATF1508AS-15JC84 FAQ

1.How can I place an order for ATF1508AS-15JC84 through Aetrix?

Please submit a Request for Quotation (RFQ) for ATF1508AS-15JC84 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 ATF1508AS-15JC84 reliable?

The price and inventory of ATF1508AS-15JC84 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ATF1508AS-15JC84 is usually 5 days.

3.What payment methods are accepted for ATF1508AS-15JC84?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ATF1508AS-15JC84 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for ATF1508AS-15JC84?

ATF1508AS-15JC84 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your ATF1508AS-15JC84 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 ATF1508AS-15JC84?

For technical support, including ATF1508AS-15JC84 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ATF1508AS-15JC84 requirements.

6.How does Aetrix verify that ATF1508AS-15JC84 is sourced from the original manufacturer or authorized distributors?

All ATF1508AS-15JC84 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 ATF1508AS-15JC84 meets industry standards.

7.What is the process for return or replacement of ATF1508AS-15JC84?

All ATF1508AS-15JC84 units undergo pre-shipment inspection (PSI). If there is an issue with ATF1508AS-15JC84, 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 ATF1508AS-15JC84 part is unused and in its original packaging.

Return procedure for ATF1508AS-15JC84:

1.Submit a request within 90 days.

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

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