Analog Devices Inc./Maxim Integrated DS80C400-FNY+

Overview

DS80C400-FNY+ from Maxim Integrated is a high-integration 8051-based network microcontroller featuring a 10/100 Ethernet MAC, CAN 2.0B controller, 1-Wire Master, three hardware serial ports, and 64 I/O pins. It executes instructions in 54ns at 75MHz, supports up to 16MB of contiguous memory via 24-bit addressing, and integrates a full TCP/IP v4/v6 stack with OS in ROM for embedded networking applications such as industrial gateways and remote data collectors.

For engineers reviewing the DS80C400-FNY+ datasheet, DS80C400-FNY+ pinout, DS80C400-FNY+ application, or DS80C400-FNY+ equivalent, key selection considerations include its dual-supply operation (VCC3 = 3.0–3.6V, VCC1 = 1.62–1.98V), 100-pin LQFP package, integrated math accelerator for 16/32-bit operations, and support for simultaneous 32 TCP connections at up to 5Mbps throughput.

Technical Context

The DS80C400-FNY+ implements a single-cycle 8051 core with 2x/4x clock multiplier for EMI reduction and flexible system clock generation up to 75MHz. Its memory subsystem uses four auto-increment/decrement data pointers and supports both multiplexed and nonmultiplexed 24-bit address buses for external memory expansion.

Networking is handled by dedicated hardware blocks: the Ethernet MAC supports IEEE 802.3 MII/ENDEC interfaces with 8kB on-chip Tx/Rx packet buffer and Magic Packet® wake-up; the CAN 2.0B controller provides 15 message centers with standard/extended ID filtering and DeviceNet™-compatible media byte filtering.

Key Specifications

Pinout & Package

DS80C400-FNY+ is housed in a 100-pin LQFP package (14mm × 14mm, 0.5mm pitch) with exposed thermal pad. Pin functions are defined across eight bidirectional 8-bit ports (P0–P7), plus dedicated Ethernet (MDC, MDIO, TXD[3:0], RXD[3:0], CRS, COL, etc.), CAN (CANRX, CANTX), 1-Wire (OW, OWSTP), and system control (RST, XTAL1, ALE, PSEN) signals.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX32650GWE+ and STM32F767ZIT6, DS80C400-FNY+ uniquely combines 8051 determinism, dual-networking (Ethernet + CAN 2.0B), 1-Wire Master, and ROM-based IPv4/v6 stack-enabling rapid deployment of interoperable industrial gateways without external memory or stack licensing.

Availability

DS80C400-FNY+ is available at Aetrix Electronics and suitable for industrial gateways, remote sensor nodes, vending machine controllers, and payment terminal gateways requiring stable component supply and long-term lifecycle support.

Supply support for DS80C400-FNY+ 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

Maxim Integrated (now part of Analog Devices) designs precision analog, mixed-signal, and high-reliability semiconductor solutions for industrial, automotive, and communications markets.

The DS80C400-FNY+ belongs to Maxim's high-speed network microcontroller product line, engineered specifically for deterministic, low-latency wired connectivity in resource-constrained industrial edge devices.

FAQ

What is the maximum Ethernet throughput achievable with the DS80C400-FNY+?

The DS80C400-FNY+ Ethernet MAC supports up to 5Mbps sustained data transfer through its integrated TCP/IP stack and 8kB on-chip packet buffer. This throughput is measured under full-duplex operation with flow control enabled and reflects real-world performance with IPv4/IPv6 protocol overhead-not raw PHY bandwidth. The DS80C400-FNY+ achieves this using hardware-accelerated descriptor management and zero-copy DMA-like data movement between MAC and memory.

Does the DS80C400-FNY+ support CAN FD or only CAN 2.0B?

The DS80C400-FNY+ implements a CAN 2.0B controller only, supporting both standard (11-bit) and extended (29-bit) identifier frames with hardware message filtering and 15 message centers. It does not support CAN FD features such as variable bit rates or larger payload sizes. For CAN FD compatibility, designers must select alternative microcontrollers like the STM32F767ZIT6, as the DS80C400-FNY+ silicon architecture predates CAN FD standardization.

How does the DS80C400-FNY+ handle power sequencing between VCC3 and VCC1 supplies?

The DS80C400-FNY+ requires strict power sequencing: VCC3 must be stable before VCC1 ramps up, and VCC1 must remain powered until VCC3 falls below VRST3 (2.76–3.05V). This ensures proper reset assertion and avoids undefined state transitions in the dual-rail architecture. The DS80C400-FNY+ includes separate power-fail warning thresholds (VPFW3/VPFW1) and reset thresholds (VRST3/VRST1) for each rail to support sequenced monitoring with discrete supervisors or PMICs.

Can the DS80C400-FNY+ operate without external memory?

Yes-the DS80C400-FNY+ contains sufficient on-chip resources to run standalone applications: 8kB ROM holds the TCP/IP stack and OS, 256B RAM is available for variables, and the 24-bit addressing allows optional expansion. While external memory is supported for large applications (e.g., web server assets), many use cases-including CAN-to-Ethernet bridges and sensor aggregators-execute entirely from internal resources. The DS80C400-FNY+'s four data pointers and hardware math accelerator further reduce reliance on external storage for compute-intensive tasks.

Is the 1-Wire interface on DS80C400-FNY+ compatible with parasitic-power devices?

Yes-the DS80C400-FNY+ 1-Wire Master supports parasitic-power mode via its OW pin, which can supply power during strong pull-up phases required by DS18B20 and similar devices. The OWSTP pin provides precise timing control for slave synchronization, and the hardware timing engine accommodates standard, overdrive, and longline modes-including voltage-drop compensation across extended cables. All timing parameters (e.g., tRSTL, tPDL) are guaranteed across -40°C to +85°C per the datasheet.