Analog Devices Inc./Maxim Integrated DS80C310-MCG+

Overview

DS80C310-MCG+ from Maxim Integrated is a high-speed, 80C32-compatible 8-bit 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 devices at the same clock frequency and is used in industrial control, embedded instrumentation, and legacy system upgrades requiring pin-compatible performance enhancement.

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 operation with 160ns single-cycle instruction timing, dual data pointer support for accelerated memory moves, configurable MOVX access stretch (2–9 cycles), and upward compatibility with DS80C320 while omitting certain peripherals.

Technical Context

The DS80C310-MCG+ implements a streamlined 8051 architecture eliminating dummy memory cycles, achieving 4-clock machine cycles versus the standard 12-clock cycle-enabling up to 3× instruction throughput at identical crystal frequencies. Its core supports static CMOS operation from DC to 25MHz and retains full 8051 instruction set compatibility with identical flag behavior and register mapping.

Timer/counter operation defaults to 12-clock-per-cycle mode on reset for backward timing compatibility but can be reconfigured via CKCON register bits (CKCON.3–CKCON.5) to run at 4-clock-per-cycle for higher-speed applications. Serial port baud rate generation and external interrupt timing remain consistent with legacy 80C32 systems unless explicitly reprogrammed.

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, compatible with standard through-hole PCB assembly and socketing for legacy 80C32 designs.

Key Features

Applications

Equivalent & Alternatives

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

Compared with DS80C320-MCG+, DS80C310-MCG+ delivers identical high-speed core performance and pinout while omitting non-essential peripherals-reducing BOM cost and simplifying qualification. Against AT89C51-24PI, it provides superior external memory interface flexibility and deterministic timing control critical for legacy system modernization.

Availability

DS80C310-MCG+ is available at Aetrix Electronics and suitable for industrial control, medical instrumentation, automated test equipment, and legacy system upgrades requiring stable component supply and long-term obsolescence management.

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 semiconductor company specializing in precision analog, mixed-signal, and high-reliability microcontrollers for industrial, medical, and communications applications.

The DS80C310-MCG+ belongs to Maxim's high-speed 8051-compatible microcontroller family, designed specifically to accelerate legacy 80C31/80C32-based systems without requiring PCB or firmware architecture changes.

FAQ

Is DS80C310-MCG+ pin-compatible with standard 80C32 devices?

Yes, DS80C310-MCG+ is fully pin-compatible with the industry-standard 80C32 in its 40-pin PDIP package. All signal names, pin positions, and electrical characteristics match, allowing direct socket replacement. The DS80C310-MCG+ retains identical Port 0–3 assignments, interrupt vectors, and memory bus signaling-making it a drop-in upgrade for existing 80C32 designs without layout or schematic modifications.

What is the maximum operating frequency of DS80C310-MCG+ and how does it affect instruction timing?

The DS80C310-MCG+ supports a maximum crystal frequency of 25MHz. At this speed, its 4-clock-per-machine-cycle architecture achieves a 160ns single-cycle instruction execution time-three times faster than the 80C32's 12-clock cycle at the same frequency. Typical code sees a 2.5× average speedup, enabling tighter real-time loops and higher throughput in serial or I/O-bound applications without altering source code.

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

No, DS80C310-MCG+ contains no on-chip ROM or flash memory. It relies entirely on external program memory accessed via the multiplexed Port 0 (AD0–AD7) and Port 2 (A8–A15) buses. The EA pin must be hardwired LOW to enable external code fetches. This architecture mirrors the original 80C31/80C32 and supports up to 64kB of external ROM, making DS80C310-MCG+ ideal for systems with existing EPROM or mask ROM infrastructure.

How does the dual data pointer (DPTR/DPTR1) in DS80C310-MCG+ improve memory transfer efficiency?

The DS80C310-MCG+ implements two independent 16-bit data pointers-DPTR (SFR 82h/83h) and DPTR1 (SFR 84h/85h)-selected via the DPS bit (SFR 86h). This eliminates the need to save/restore address registers during block moves: software loads source into one DPTR and destination into the other, then toggles DPS to switch context in a single INC instruction. Benchmarks show 40–60% reduction in cycles for 256-byte memory copies compared to single-DPTR 80C32 implementations.

Can DS80C310-MCG+ operate in low-power modes, and how is wake-up handled?

Yes, DS80C310-MCG+ supports Active, Idle, and Stop power modes. In Stop mode, ICC drops to ≤1µA by halting all internal clocks. Wake-up occurs exclusively via external interrupts INT2–INT5 (edge-triggered) or hardware reset. An internal crystal counter enforces a 65,536-clock stabilization delay post-wake, and software must insert a 100-machine-cycle delay before resuming time-critical operations like serial communication or memory access to ensure timing integrity.