Analog Devices Inc./Maxim Integrated DS80C310-QCG

Overview

DS80C310-QCG from Maxim Integrated is a high-speed, 8051-compatible CMOS microcontroller in 44-pin PLCC package, executing standard 8051 instructions at 2.5× speed (up to 62.5 MHz apparent throughput) with 25 MHz crystal, 256 bytes on-chip RAM, three 16-bit timer/counters, and full-duplex serial port - used in industrial control panels requiring deterministic real-time response under legacy 8051 codebases.

For engineers reviewing the DS80C310-QCG datasheet, DS80C310-QCG pinout, DS80C310-QCG application, or DS80C310-QCG equivalent, this page delivers verified architecture details, validated PLCC pin mapping, confirmed MOVX stretch timing behavior, dual-DPTR memory move acceleration, and drop-in replacement guidance for 80C32-based systems operating at extended temperature.

Technical Context

The DS80C310-QCG implements a 4-clock-per-machine-cycle core versus the legacy 12-clock 8051, eliminating dummy memory cycles while retaining full 8051 instruction set compatibility and identical SFR layout. Its reset-default timer operation runs at 12 clocks/cycle to preserve legacy baud rates and interrupt timing.

It supports variable MOVX access timing (2–9 machine cycles via CKCON[2:0]) and dual data pointers (DPTR/DPTR1 selected by DPS bit), enabling zero-overhead block transfers between external RAM regions without register save/restore - critical for protocol stack buffering and display frame updates.

Key Specifications

Pinout & Package

DS80C310-QCG is housed in a 44-pin Plastic Leaded Chip Carrier (PLCC) package with J-lead configuration, 1.27 mm pitch, and body size 16.59 mm × 16.59 mm. Pin 1 is marked by corner notch; orientation follows standard PLCC top-view convention with pin 1 at top-left.

Key Features

Applications

Equivalent & Alternatives

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

Compared with DS80C320-QCG, DS80C310-QCG removes non-essential peripherals to reduce cost while preserving identical speed, pinout, and memory interface behavior; versus AT89C51RC2-RLTUM, it maintains strict 80C32 socket compatibility and external bus timing control - critical for certified legacy hardware upgrades.

Availability

DS80C310-QCG is available at Aetrix Electronics and suitable for industrial control panels, medical device retrofits, smart meter firmware upgrades, and automated test equipment requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for DS80C310-QCG 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 high-performance analog, mixed-signal, and embedded solutions for industrial, automotive, and communications markets.

The DS80C310-QCG belongs to Maxim's high-speed 8051 microcontroller family, designed specifically to extend the life of legacy 80C31/80C32-based systems through pin- and code-compatible performance uplift without requiring PCB or firmware redesign.

FAQ

Is DS80C310-QCG pin-compatible with the standard 80C32?

Yes, DS80C310-QCG is fully pin-compatible with the 80C32 in its 44-pin PLCC variant. All I/O, control, and power pins map identically, including P0–P3, RST, EA, ALE, PSEN, XTAL1/XTAL2, WR, RD, and interrupt/timer signals. This enables direct socket replacement in existing 80C32-based PLCC designs without layout changes.

What is the maximum crystal frequency supported by DS80C310-QCG?

The DS80C310-QCG supports a maximum crystal frequency of 25 MHz, as specified in the Ordering Information table and confirmed in the General Description. At 25 MHz, the device achieves an apparent instruction execution rate of approximately 62.5 MHz due to its 4-clock-per-cycle architecture.

Does DS80C310-QCG include on-chip ROM or Flash memory?

No, DS80C310-QCG contains no on-chip program memory. It is a ROMless microcontroller that 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 to enable external ROM execution.

How does the MOVX stretch feature work in DS80C310-QCG?

The DS80C310-QCG implements MOVX stretch via bits CKCON.2–CKCON.0 (SFR 8Eh), allowing software to configure external data memory access from 2 to 9 machine cycles. A stretch value of 0 yields 2-cycle MOVX; value 7 yields 9-cycle MOVX. Default on reset is 1 (3-cycle), ensuring compatibility with standard 120 ns RAM.

Can DS80C310-QCG replace DS80C320 in existing designs?

DS80C310-QCG is upwardly compatible with DS80C320 but omits certain peripherals (e.g., watchdog timer, power-fail interrupt). If those features are unused in the target design, DS80C310-QCG serves as a functionally equivalent, lower-cost replacement with identical pinout, speed, and memory interface behavior.