Microchip Technology ATF1504AS-10JI44

Overview

ATF1504AS-10JI44 from Microchip Technology (formerly Atmel) 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 reprogrammable logic integration solution for legacy TTL/SSI/MSI replacement and control-plane logic in industrial I/O modules.

For engineers reviewing the ATF1504AS-10JI44 datasheet, ATF1504AS-10JI44 pinout, ATF1504AS-10JI44 application, or ATF1504AS-10JI44 equivalent, this device supports PCI-compliant I/O, programmable slew rate, pin-keeper circuits, three global clocks, and JTAG boundary-scan testing per IEEE Std. 1149.1a–1993 - critical for board-level testability and field-upgradable control logic.

Technical Context

The ATF1504AS-10JI44 implements a flexible macrocell architecture with five sections per macrocell: product term generation, OR/XOR/cascade logic, D/T/latch-configurable flip-flop, output select/enable, and logic array inputs. Each macrocell provides buried feedback to the global bus and foldback logic to a regional bus.

Its routing architecture includes a 40-signal global bus switch matrix, four cascaded logic chains (each supporting up to 40-product-term sum terms), ITD circuits on global clocks/I/Os, and fast registered input paths from product terms - enabling high fan-in combinatorial logic and synchronous state machines without external glue logic.

Key Specifications

Pinout & Package

ATF1504AS-10JI44 is packaged in a 44-lead TQFP (Thin Quad Flat Package) with 0.8 mm lead pitch, JEDEC MO-153 compliant, body size 10 mm × 10 mm. Pin 1 is marked by a corner chamfer or dot; top-side marking includes "ATF1504AS-10JI44" and date code.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ATF1504AS-10JI44, the XCR3064XL-10VQ44C offers lower static power but sacrifices 5 V compatibility and PCI electrical compliance, while the ISPLSI2064VE-100LT44 provides stronger I/O drive at the cost of missing key features like programmable slew rate and input transition detection - making ATF1504AS-10JI44 uniquely suited for mixed-voltage industrial control upgrades.

Availability

ATF1504AS-10JI44 is available at Aetrix Electronics and suitable for industrial PLC I/O expansion, legacy system emulation, and PCI bus interface logic requiring stable component supply across extended product lifecycles.

Supply support for ATF1504AS-10JI44 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 ATF1504AS family, including datasheets, programming tools, and long-term supply commitments for industrial-grade PLDs.

The ATF1504AS product line was designed for high-reliability, field-upgradable control logic in industrial automation, telecommunications infrastructure, and military/aerospace subsystems - emphasizing reprogrammability, mixed-voltage I/O, and JTAG testability.

FAQ

What is the maximum operating frequency of the ATF1504AS-10JI44?

The ATF1504AS-10JI44 supports registered operation up to 125 MHz under standard conditions, with AC characteristics validated at –10 speed grade. Its 7.5 ns pin-to-pin delay enables reliable timing closure in industrial control applications running at 80–100 MHz with margin. The actual achievable frequency depends on design complexity, routing congestion, and PCB layout - but the ATF1504AS-10JI44 consistently meets 125 MHz timing in verified reference designs using Microchip's design tools.

Does the ATF1504AS-10JI44 support both 3.3 V and 5.0 V I/O operation?

Yes, the ATF1504AS-10JI44 supports dual-voltage I/O: it operates with either 3.3 V (3.0–3.6 V) or 5.0 V (4.5–5.5 V) VCCIO supplies, allowing direct interfacing with mixed-voltage systems. Core logic runs at 5.0 V (VCCINT = 5 V ±5%). This dual-voltage capability makes the ATF1504AS-10JI44 ideal for upgrading legacy 5 V designs while integrating with modern 3.3 V peripherals - no level shifters required.

How does the pin-keeper feature work on the ATF1504AS-10JI44?

The ATF1504AS-10JI44 includes programmable pin-keeper circuits on all inputs and I/Os. When enabled, these circuits retain the last driven logic state (high or low) after the driving source is removed - preventing floating inputs that cause shoot-through current and system noise. This eliminates external pull-up resistors and their associated DC power loss. The pin-keeper is configured during programming and remains active during power-down mode, ensuring deterministic behavior in the ATF1504AS-10JI44 throughout all operational states.

Can the ATF1504AS-10JI44 be programmed in-system without removing it from the PCB?

Yes, the ATF1504AS-10JI44 supports full in-system programmability (ISP) via its 4-pin JTAG interface (TDI, TDO, TMS, TCK), compliant with IEEE Std. 1149.1a–1993. Programming can be performed using Microchip's ATDH-ISP hardware, third-party JTAG programmers, or custom microcontroller interfaces - all without device removal. The ATF1504AS-10JI44 remains fully functional during ISP, and its pin-keeper circuitry preserves I/O states to avoid disturbing connected circuitry.

What are the key differences between ATF1504AS-10JI44 and ATF1504ASL-10JI44?

The ATF1504ASL-10JI44 is the low-power variant featuring automatic µA standby mode, whereas the ATF1504AS-10JI44 uses standard standby current (105 mA commercial, 130 mA industrial). Both share identical logic density, pinout, speed grade (–10), and package (44-lead TQFP), but only the "L" version delivers 10 µA standby. The ATF1504AS-10JI44 is selected when higher-speed I/O transitions or legacy 5 V system compatibility takes priority over ultra-low quiescent power - making it the preferred choice for PCI interface and industrial control applications.