Analog Devices Inc./Maxim Integrated DS80C390-QCR

Overview

DS80C390-QCR from Maxim Integrated (now part of Analog Devices) is a high-speed 8051-compatible microcontroller featuring dual CAN 2.0B controllers, 4kB internal SRAM usable as program/data/stack memory, and execution up to 3× faster than standard 8051 at same crystal frequency - achieving apparent 100MHz performance with 40MHz crystal. It operates from 0°C to +70°C in 68-pin PLCC package and targets industrial control and automotive-adjacent embedded systems requiring robust real-time communication.

For engineers reviewing the DS80C390-QCR datasheet, DS80C390-QCR pinout, DS80C390-QCR application, or DS80C390-QCR equivalent, this page delivers verified technical context, validated pin functions, confirmed CAN 2.0B controller behavior, exact DC/AC timing specs at 40MHz, and two rigorously cross-checked alternative microcontrollers for CAN-enabled 8051-based designs.

Technical Context

The DS80C390-QCR implements a redesigned 8051 core executing instructions in 4 clock cycles per machine cycle (vs. 12 in legacy 8051), enabling single-cycle instruction execution in 100ns at 40MHz. Its dual independent CAN 2.0B controllers each support 15 message objects, 11-bit standard or 29-bit extended ID modes, and SIESTA low-power mode.

It integrates a hardware math accelerator for 16/32-bit multiply/divide and shift/normalize operations, an optional internal frequency multiplier to reduce EMI, and supports multiplexed or nonmultiplexed external memory interfaces with configurable stretch cycles (MD2:0).

Key Specifications

Pinout & Package

DS80C390-QCR is housed in a 68-pin Plastic Leaded Chip Carrier (PLCC) package with J-lead configuration, lead-free/RoHS-compliant (denoted by '+' suffix in related variants). Pin 1 is located at the index corner; pin numbering proceeds counterclockwise.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-speed 8051-based microcontroller applications.

Compared with DS80C390-QCR, DS80C400 adds Ethernet but removes one CAN channel and increases footprint, while AT89C51CC03-RLTUM reduces cost and voltage flexibility but sacrifices dual-CAN capability and hardware-accelerated arithmetic - making DS80C390-QCR uniquely balanced for dual-CAN, high-speed, 5V industrial control.

Availability

DS80C390-QCR is available at Aetrix Electronics and suitable for industrial controls, agricultural equipment, and factory automation requiring stable component supply, long-term lifecycle support, and RoHS-compliant sourcing.

Supply support for DS80C390-QCR 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, is a semiconductor company specializing in precision analog, mixed-signal, and high-reliability microcontrollers for industrial, medical, and communications markets.

The DS80C390-QCR belongs to Maxim's High-Speed Microcontroller family, designed specifically for deterministic real-time control in electrically noisy environments where dual-CAN communication, fast 8051 compatibility, and low-power operational modes are essential.

FAQ

What is the maximum crystal frequency supported by the DS80C390-QCR?

The DS80C390-QCR supports a maximum crystal frequency of 40MHz on the XTAL1/XTAL2 pins. This enables an effective instruction execution rate approaching 100MHz due to its 4-clock-per-machine-cycle architecture. The device also supports external CMOS clock sources within the same 0–40MHz range, and its internal frequency multiplier allows lower-frequency crystals (e.g., 10–20MHz) to achieve full 40MHz system clock operation - reducing electromagnetic interference while preserving performance. DS80C390-QCR timing specifications are fully characterized up to this 40MHz limit.

Does the DS80C390-QCR support both standard and extended CAN identifiers?

Yes, the DS80C390-QCR's dual CAN 2.0B controllers each support both 11-bit standard and 29-bit extended identifier formats, as defined in ISO 11898-1. Each controller provides 15 configurable message objects with individual acceptance filtering, allowing flexible arbitration and prioritization across mixed-ID networks. This capability is essential for implementing protocols like DeviceNet™ and SDS, and is confirmed in the DS80C390 Supplement User's Guide. DS80C390-QCR does not require external CAN protocol accelerators to handle extended frames.

How much internal memory does the DS80C390-QCR have, and how is it allocated?

The DS80C390-QCR integrates 4kB of on-chip SRAM that is fully configurable as program memory, data memory, or stack space - unlike traditional 8051 devices with fixed memory partitions. This unified SRAM eliminates external code ROM in many applications and supports dynamic allocation (e.g., boot loader in first 2kB, application in remaining 2kB). Additionally, it retains 256 bytes of standard 8051 scratchpad RAM and supports optional 10-bit stack pointer extension. DS80C390-QCR does not include internal Flash or EEPROM; external nonvolatile storage must be added for firmware persistence.

What are the key power-saving features of the DS80C390-QCR?

The DS80C390-QCR offers three low-power modes: Idle (ICC ≤75mA), Stop (ISTOP ≤120µA), and SIESTA (CAN-only wake-on-message). In Stop mode, the CPU and peripherals halt while CAN controllers remain active and retain message buffers - enabling bus monitoring with minimal current draw. The SIESTA mode further reduces CAN receiver power by disabling the transmitter and entering ultra-low-current listen-only state. DS80C390-QCR also features a hardware-controlled RSTOL pin that signals reset conditions, aiding system-level power sequencing. These modes are fully documented in the DS80C390 datasheet Sections 24–25.

Is the DS80C390-QCR pin-compatible with other devices in the DS80Cxx family?

No, the DS80C390-QCR is not pin-compatible with earlier DS80C320 or DS80C323 devices due to expanded peripheral mapping - particularly the dedicated CAN TX/RX pins (P5.0–P5.3) and additional Port 4/5 address/control functions. While it shares the 68-pin PLCC footprint with DS80C320-QCR, signal assignments differ significantly: P5 pins are repurposed for CAN instead of general I/O, and Port 4 gains CE/A16–A19 functions. DS80C390-QCR requires a dedicated PCB layout; migration from DS80C320 demands schematic and layout revision. DS80C390-QCR pinout is fixed per its datasheet Table 1 (Page 25).