Analog Devices Inc./Maxim Integrated DS80C310-MCG

Overview

DS80C310-MCG from Maxim Integrated is a high-speed, 80C32-compatible 8-bit CMOS microcontroller featuring a 4-clock-per-machine-cycle core, 25MHz maximum crystal speed, 256 bytes of on-chip RAM, three 16-bit timer/counters, and a full-duplex serial port. It executes standard 8051 instructions 1.5×–3× faster than legacy 80C31/80C32 at the same clock frequency and is used in industrial control, embedded instrumentation, and legacy 8051 system upgrades requiring higher throughput without code rewrite.

For engineers reviewing the DS80C310-MCG datasheet, DS80C310-MCG pinout, DS80C310-MCG application, or DS80C310-MCG equivalent, key selection considerations include its 40-pin PDIP package, 25MHz max clock, dual data pointer (DPTR/DPTR1), programmable MOVX memory access stretch (2–9 cycles), and upward compatibility with DS80C320 while omitting some peripherals.

Technical Context

The DS80C310-MCG implements a streamlined 8051 architecture eliminating dummy memory cycles: each machine cycle requires only 4 oscillator clocks versus 12 in standard 8051, enabling single-cycle instructions in 160ns at 25MHz. Its dual DPTR (SFRs 82h–85h) accelerates block memory moves, and CKCON register (8Eh) controls independent timer speeds (4- or 12-clock mode) and MOVX stretch (M2–M0 bits).

It retains full 8051 instruction set compatibility and pinout but introduces new SFRs including DPS (86h) for DPTR selection, EXIF (91h) for extended interrupts INT2–INT5, and STATUS (C5h) for interrupt priority level indication. Timers default to 12-clock operation on reset for backward timing compatibility, with optional 4-clock mode for higher-speed applications.

Key Specifications

Pinout & Package

DS80C310-MCG is housed in a 40-pin plastic DIP (dual in-line package) with 0.6-inch body width and 0.1-inch pin pitch. Pin functions follow standard 80C32 layout with enhancements including P1.0–P1.7 supporting Timer 2 I/O and five additional edge-triggered interrupts (INT2–INT5).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 8051-compatible microcontroller applications.

Compared with DS80C320-MCG, DS80C310-MCG offers identical speed and pinout at lower cost by omitting PCA and watchdog; compared with AT89C51-24PI, it delivers 2.5× throughput and advanced memory interface flexibility but requires external program memory.

Availability

DS80C310-MCG is available at Aetrix Electronics and suitable for industrial control, embedded instrumentation, and legacy 8051 system upgrades requiring stable component supply, long-term lifecycle support, and RoHS-compliant sourcing.

Supply support for DS80C310-MCG 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 U.S.-based semiconductor company specializing in precision analog, mixed-signal, and high-reliability microcontrollers for industrial, automotive, and communications markets.

The DS80C310-MCG belongs to Maxim's high-speed 8051-compatible microcontroller family, designed specifically to accelerate legacy 8051-based systems while preserving software and hardware compatibility - targeting cost-sensitive industrial upgrades and instrumentation.

FAQ

What is the maximum operating frequency of the DS80C310-MCG?

The DS80C310-MCG supports a maximum crystal frequency of 25MHz. At this clock speed, its 4-clock-per-machine-cycle architecture achieves an apparent instruction execution rate of approximately 62.5MHz, delivering a typical 2.5× speed improvement over standard 80C32 devices using the same crystal and code base. The device operates across 0°C to +70°C ambient temperature.

Is the DS80C310-MCG pin compatible with standard 80C32 microcontrollers?

Yes, the DS80C310-MCG is fully pin compatible with the 80C32 in its 40-pin PDIP package. All signal names, pin positions, and electrical characteristics match the industry-standard 80C32 layout, enabling direct socket replacement in existing designs. However, DS80C310-MCG introduces new functions on Port 1 pins (e.g., INT2–INT5) that remain unused in legacy 80C32 firmware unless explicitly enabled.

How does the dual data pointer (DPTR) in the DS80C310-MCG improve performance?

The DS80C310-MCG implements two independent data pointers: DPTR (SFRs 82h/83h) and DPTR1 (SFRs 84h/85h), selected via DPS bit (SFR 86h). This allows simultaneous addressing of source and destination memory locations during block moves, eliminating the need to save and reload addresses in software. As a result, memcpy-style operations execute with fewer instructions and reduced cycle count - directly accelerating data transfer in communication buffers and display drivers.

Can the DS80C310-MCG interface with slow peripherals like LCD controllers?

Yes, the DS80C310-MCG supports variable-speed MOVX access via the CKCON register (bits M2–M0), allowing MOVX read/write strobes to be stretched from 2 to 9 machine cycles. This accommodates slow peripherals such as character LCDs or legacy UARTs without external wait-state logic. The default reset value (stretch = 1 → 3 cycles) ensures compatibility with common 120ns/150ns RAM, and software can dynamically adjust stretch per access based on target device timing.

Does the DS80C310-MCG include on-chip program memory?

No, the DS80C310-MCG contains no on-chip ROM or flash memory. It relies entirely on external program memory accessed via the multiplexed P0 address/data bus and P2 upper address lines. The EA pin must be tied low (GND) to enable external program fetches. This architecture follows the original 80C31/80C32 model, making it suitable for systems requiring large, field-upgradable firmware stored in EPROM or Flash.