M4A3-256/128-7FAC

Product Overview

M4A3-256/128-7FAC is a Lattice M4/M4A3 CPLD from Lattice Semiconductor with 256 macrocells and an ordering-code I/O class of 128. It is designed for deterministic control, wide decoding, registered state machines and board-level interface consolidation using nonvolatile product-term logic. The complete ordering code selects the density/I/O combination, speed grade, package and commercial or industrial temperature option, all of which must match the PCB and compiled design.

This ordering variant belongs to the M4 generation and suffix-defined supply family. The -7 speed token identifies its timing grade. The code resolves to FAC package code. It also carries a commercial-temperature ordering suffix. These suffix details affect PCB footprint, I/O availability, timing closure and environmental qualification; they are not cosmetic ordering differences.

Architecture and Technical Characteristics

The M4/M4A3 architecture organizes product-term macrocells into logic blocks linked through a programmable interconnect. Macrocells can implement registered or combinational equations, and global control networks distribute clocks, reset and output-enable signals. The capacity/I/O pair encoded before the speed suffix identifies the fitting target. Programmer algorithm, package pinout and voltage differ among M4, M4A3 and N variants, so source files should be re-fitted only for an explicitly supported target.

Key Features

• Manufacturer: Lattice Semiconductor
• Full part number: M4A3-256/128-7FAC
• CPLD family: Lattice M4/M4A3 CPLD
• Logic capacity: 256 macrocells
• Ordering-code I/O class: 128; confirm actual bonded user I/O for the selected package
• Configuration technology: nonvolatile product-term CPLD
• Voltage class: M4 generation and suffix-defined supply family
• Speed-grade designator: -7; guaranteed timing must be taken from the exact M4/M4A3 AC table
• Package / ordering suffix: FAC; resolve footprint and terminal count in the exact M4 package table
• Temperature / qualification: commercial-temperature ordering suffix
• Programming file and tool: verify the supported JEDEC/JTAG flow for the exact M4 or LC5xxx target
• Package user I/O: confirm from the official pin table; terminal count is not the same as usable I/O

Applications

• Address decoding and chip-select generation
• Reset, power sequencing and supervisory control
• Bus bridging, protocol glue and interface qualification
• Deterministic finite-state machines
• Higher-density board-control consolidation and peripheral management
• Industrial, communications and legacy platform maintenance

Design and Replacement Considerations

Before replacing this device, compare macrocell capacity, usable I/O for the selected package, core and I/O rails, input tolerance, global clock and reset resources, power-up behavior, JTAG pinout and guaranteed propagation/setup/clock-to-output timing. Preserve the original project and programming file. A blank CPLD does not contain the customer function, and a JEDEC or SVF file compiled for a related density or package must not be assumed compatible. When migrating to another family, recompile, rerun fitter constraints and perform timing and board-level voltage validation.

Quality & Sourcing

For M4A3-256/128-7FAC, Antrex Electronics can support stock and lead-time checks, full-suffix confirmation, package and date-code review, product photographs, label inspection and shipment planning. Buyers should state whether blank or pre-programmed parts are required and provide the target quantity, acceptable date code, packaging form and inspection requirements. For discontinued or long-stored CPLDs, recommended controls include traceability review, marking comparison, lead and ball-condition inspection, solderability evaluation and third-party electrical or X-ray testing when risk warrants it. OEMs, EMS providers, repair centers and component buyers may submit BOM lists and hard-to-find programmable-logic requirements for sourcing support.