Lattice Semiconductor Corporation LC4256B-5TN100C

Mfr. Part

LC4256B-5TN100C

Manufacturer

Lattice Semiconductor. Y-IC is a quality authorized distributor for Lattice, and we are committed to delivering genuine parts, fast service, and the best technical support.

Detailed Description

Flash-based CPLD with 256 macrocells from the ispMACH 4000B series. In-system programmable via JTAG. Commercial grade. 5 ns max propagation delay. 100-pin TQFP package (14 mm x 14 mm) for surface-mount designs. Internal core supply 2.3 V to 2.7 V. 64 user I/O. 16 logic array blocks. Ideal for glue logic, bus control, state machines, interface bridging, and rapid hardware fixes without changing the PCB.

Key Features

256 macrocells, 16 logic blocks for structured design

In-System Programmable using standard JTAG tools

Flash-based, non-volatile, instant-on operation

5 ns max tpd for fast control and interface logic

64 user I/O for flexible connectivity

Core supply 2.3 V to 2.7 V (typical 2.5 V)

Surface-mount 100-TQFP (14x14 mm) footprint

ispMACH 4000B architecture for low-power and stable timing

IEEE 1149.1 boundary scan support for test and programming

Base product number LC4256 for cross-family identification

Key Advantages

Instant-on flash architecture eliminates boot-time delays common in SRAM FPGA solutions

Simple, reliable CPLD timing with predictable propagation delay

In-system programmability cuts rework cost and speeds iteration

Non-volatile configuration increases robustness in power cycling and brownout conditions

Mature ecosystem and tooling reduce risk and learning curve

Compact 100-pin TQFP saves board space while offering ample I/O

Stable operation in commercial environments with junction temperature up to 90°C

Packaging

Type: 100-TQFP and 100-LQFP variants noted by supplier, standard 14 mm x 14 mm body

Shipping: Tray packaging for safe handling and automated assembly

Material: Molded plastic QFP with copper leadframe and tin plating on gull-wing leads

Size: Body 14 x 14 mm, typical pin pitch approximately 0.5 mm, low profile

Pin configuration: 100 total pins with 64 user I/O; remaining pins for power, ground, JTAG, configuration, and dedicated signals

Thermal characteristics: Commercial-grade; junction temperature 0°C to 90°C. Thermal performance depends on PCB copper, airflow, and ambient. Follow Lattice thermal guidelines for accurate derating.

Electrical properties: Internal core supply 2.3 V to 2.7 V. Max tpd 5 ns. In-system programmable. I/O banks support common logic standards in the family; consult datasheet for exact I/O voltage levels and standards. Use proper decoupling on each VCC and GND pin.

Mounting: Surface mount, gull-wing leads suitable for standard reflow processes. Observe JEDEC moisture handling practices for plastic QFP packages.

Lifecycle

Current status: Actively used and widely available. No public end-of-life notice for this specific commercial-grade variant at the time of writing, though ispMACH 4000B is a mature family. Availability can vary by region and date.

Equivalent or alternative models:

- LC4256B-5TN100I: Industrial temperature variant for wider ambient range

- LC4256B-6TN100C: Alternative speed grade (slightly slower tpd), same package

- Family density alternatives with similar architecture: LC4032B (32 macrocells), LC4064B (64), LC4128B (128) for smaller designs; these share ispMACH 4000B traits

- Low-power alternative family: ispMACH 4000ZE series for reduced power at similar densities

- CPLD-like FPGA alternative: MachXO or MachXO2 families for more features and integration if you need higher density or embedded functions

If you need exact drop-in or pin-compatible replacements, or other speed/temperature/package codes, please contact our sales team via the Y-IC website for the latest cross-reference and availability.

Key Application Areas

Glue logic and bus interface adaptation between ASICs, MCUs, and peripherals

Finite state machines, control sequencing, and power-rail control with instant-on

Level translation and protocol bridging for common peripheral buses

Memory control and address decoding for SRAM, Flash, or specialty memories

Industrial automation and instrumentation, commercial temperature environments

Consumer and networking equipment needing fast, predictable control logic

Rapid design updates where ISP reprogramming avoids PCB changes

Datasheet

Our Y-IC website hosts the most authoritative and up-to-date datasheet for LC4256B-5TN100C. We recommend downloading it directly on this page to verify I/O standards, timing, pinout, programming details, and thermal guidelines.

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