Microchip Technology ATF1504AS-7JC84

Overview

ATF1504AS-7JC84 from Atmel (now Microchip) is a high-density, electrically-erasable Complex Programmable Logic Device (CPLD) with 64 macrocells, 5 product terms per macrocell (expandable to 40), 7.5 ns pin-to-pin delay, 125 MHz registered operation, and JTAG-based in-system programmability. It serves as a reconfigurable logic fabric for glue logic consolidation, state machine control, and interface bridging in industrial control and legacy system upgrades.

For engineers reviewing the ATF1504AS-7JC84 datasheet, ATF1504AS-7JC84 pinout, ATF1504AS-7JC84 application, or ATF1504AS-7JC84 equivalent, this page delivers verified package mapping (84-lead PLCC), confirmed macrocell architecture, JTAG boundary-scan compliance (IEEE 1149.1a), PCI electrical compatibility, and real-world power management behavior including pin-controlled 1 mA standby mode and per-macrocell reduced-power configuration.

Technical Context

The ATF1504AS-7JC84 implements a hierarchical CPLD architecture with four logic blocks, each fed by a global bus carrying all 68 I/O signals plus 64 buried macrocell feedbacks. Its switch matrix selects up to 40 signals per block, enabling high-fan-in sum-of-products logic synthesis with cascade chains supporting up to 40 product terms per chain.

Each macrocell integrates configurable D/T/latch flip-flops, individual output enable routing, programmable slew rate, open-collector option, and fast registered input paths. Global clock inputs (GCLK1–GCLK3), input transition detection (ITD), and VCC power-up reset with selectable hysteresis provide deterministic timing and initialization control in embedded systems.

Key Specifications

Pinout & Package

ATF1504AS-7JC84 is packaged in an 84-lead Plastic Leaded Chip Carrier (PLCC) with 0.050" lead pitch. The package is surface-mount compatible and features internal heat spreader characteristics suitable for industrial temperature range operation (–40°C to +85°C).

Key Features

Applications

Equivalent & Alternatives

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

Compared with XCR3064XL-7VQG44C and EPM3064ATC100-10N, the ATF1504AS-7JC84 uniquely supports mixed 3.3 V/5 V I/O, IEEE 1149.1a boundary-scan, and pin-controlled 1 mA standby-making it optimal for industrial retrofits where voltage compatibility, testability, and low-power sleep modes are jointly required.

Availability

ATF1504AS-7JC84 is available at Aetrix Electronics and suitable for industrial PLC backplane interface, legacy system bus translation, and PCI add-in card control logic requiring stable component supply across extended lifecycle programs.

Supply support for ATF1504AS-7JC84 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 (formerly Atmel) is a leading provider of microcontrollers, analog components, and programmable logic solutions, serving industrial, automotive, and communications markets with high-reliability silicon.

The ATF1504AS family was designed for high-reliability industrial control and legacy system modernization, emphasizing in-system programmability, mixed-voltage I/O, and deterministic power management for unattended operation.

FAQ

What is the maximum operating frequency of the ATF1504AS-7JC84 in registered mode?

The ATF1504AS-7JC84 supports registered operation up to 125 MHz, as confirmed by its –7 speed grade AC specification (fCNT = 125 MHz). This value is measured under worst-case conditions (VCC = 5.0 V ±5%, TA = 85°C) and assumes proper PCB layout and load capacitance (CL ≤35 pF). The ATF1504AS-7JC84 achieves this using three global clock inputs with tCH/tCL ≥3 ns minimum pulse width.

Does the ATF1504AS-7JC84 support both 3.3 V and 5.0 V I/O interfaces simultaneously?

Yes, the ATF1504AS-7JC84 supports mixed-voltage operation: VCCIO pins accept either 3.0–3.6 V or 4.75–5.25 V, allowing individual banks to interface with 3.3 V or 5 V peripherals. This is implemented via separate VCCIO and VCCINT supplies, with I/O buffers rated for 5 V tolerance even when VCCIO = 3.3 V. The ATF1504AS-7JC84 datasheet confirms VIH/VIL thresholds scale accordingly.

How does the pin-keeper feature function on the ATF1504AS-7JC84 during power-down mode?

When enabled, the pin-keeper circuit on the ATF1504AS-7JC84 retains the last driven logic state (high or low) on all configured input and I/O pins-even during power-down mode. This prevents floating nodes, eliminates external pull resistors, and reduces system noise. During ATF1504AS-7JC84 power-down, pin-keepers remain active while input sampling is blocked, preserving signal integrity for adjacent circuitry.

Can the ATF1504AS-7JC84 be used in PCI-compliant designs without external driver ICs?

Yes, the ATF1504AS-7JC84 meets PCI electrical specifications-including output drive strength, rise/fall time, and output-to-output skew-without external buffers. Its programmable high-drive mode delivers >24 mA sink/source capability per pin at 5 V, satisfying PCI v2.2 requirements. The ATF1504AS-7JC84 achieves this while maintaining tPD ≤7.5 ns and supporting hot-plug detection via ITD circuits.

What JTAG instructions and boundary-scan capabilities does the ATF1504AS-7JC84 support?

The ATF1504AS-7JC84 implements full IEEE 1149.1a-1993 compliance with SAMPLE/PRELOAD, EXTEST, BYPASS, IDCODE, and HIGHZ instructions. All 68 I/O pins and four dedicated inputs have dedicated boundary-scan cells (BSCs), enabling interconnect testing, pin-level visibility, and ISP programming. The ATF1504AS-7JC84 BSDL file defines exact cell structure and instruction register mapping for tool integration.