Analog Devices Inc./Maxim Integrated DS80C310-QCG+T&R

Overview

DS80C310-QCG+T&R from Maxim Integrated is a high-speed, 8051-compatible CMOS microcontroller with pin- and instruction-set compatibility to the 80C32. It executes instructions at 2.5× the speed of standard 8051 cores at the same crystal frequency (up to 25MHz), delivers 62.5MHz apparent execution rate, features dual data pointers for accelerated memory moves, and supports variable MOVX timing (2–9 machine cycles) for flexible external memory/peripheral interfacing. It targets legacy 8051 upgrade paths in industrial control and embedded instrumentation.

For engineers reviewing the DS80C310-QCG+T&R datasheet, DS80C310-QCG+T&R pinout, DS80C310-QCG+T&R application, or DS80C310-QCG+T&R equivalent, key selection considerations include its 4-clock-per-machine-cycle core architecture, PLCC-44 package mapping, 256-byte on-chip RAM, three 16-bit timer/counters, full-duplex serial port, and upward compatibility with DS80C320 - all while maintaining drop-in replacement capability for existing 80C31/80C32 designs.

Technical Context

The DS80C310-QCG+T&R implements a streamlined 8051-derived core eliminating dummy memory cycles, achieving 4 clocks per machine cycle versus the legacy 12-clock baseline. Its instruction timing is fully backward-compatible at source-code level but requires adjustment for time-critical loops due to faster execution - timers default to 12-clock mode for baud-rate continuity but can be reconfigured to 4-clock operation via CKCON register bits.

It uses a multiplexed Port 0 (AD0–AD7) with ALE-controlled latching, Port 2 as address MSB (A8–A15), and dedicated RD/WR strobes. Memory access is decoupled: program fetches run at fixed 4-clock cycle rate, while MOVX data transfers are software-stretchable (2–9 cycles) using CKCON.2–CKCON.0 to match external RAM or slow peripherals without glue logic.

Key Specifications

Pinout & Package

DS80C310-QCG+T&R is housed in a 44-pin Plastic Leaded Chip Carrier (PLCC) package with J-lead profile, rated for 0°C to +70°C operation and RoHS-compliant (lead-free).

Key Features

Applications

Equivalent & Alternatives

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

Compared with DS80C320-QCG+T&R, DS80C310-QCG+T&R removes non-core peripherals to reduce cost and power, while retaining identical instruction timing and pinout; versus AT89C51RC2-RLTUM, it prioritizes socket compatibility and external memory timing control over on-chip Flash - making it optimal for legacy system modernization where hardware footprint and timing predictability are critical.

Availability

DS80C310-QCG+T&R is available at Aetrix Electronics and suitable for industrial control systems, medical instrumentation, automotive diagnostics, and smart energy metering requiring stable component supply across extended product lifecycles.

Supply support for DS80C310-QCG+T&R 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 processing solutions for industrial, automotive, and communications markets.

The DS80C310-QCG+T&R belongs to Maxim's high-speed 8051-compatible microcontroller family, designed specifically to extend the life of legacy 80C31/80C32-based systems through performance upgrades without hardware redesign.

FAQ

What is the maximum crystal frequency supported by the DS80C310-QCG+T&R?

The DS80C310-QCG+T&R supports a maximum crystal frequency of 25MHz. This enables an apparent instruction execution rate of 62.5MHz due to its 4-clock-per-machine-cycle architecture. The device operates reliably across the full 0°C to +70°C temperature range at this frequency, and timing parameters in the datasheet are validated up to 25MHz with standard load capacitance and duty cycle conditions.

Is the DS80C310-QCG+T&R pin-compatible with standard 80C32 devices?

Yes, the DS80C310-QCG+T&R is fully pin-compatible with the 80C32 in the 44-pin PLCC package. All signal names, pin positions, and electrical characteristics match the legacy part, allowing direct socket replacement. However, designers must verify timing-critical firmware sections - especially those relying on instruction cycle counts - since the DS80C310-QCG+T&R executes most instructions 2.5× faster at the same crystal frequency.

How does the MOVX timing stretch feature work in the DS80C310-QCG+T&R?

The DS80C310-QCG+T&R implements MOVX timing 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 for fast SRAM; value 7 yields 9-cycle MOVX for slow peripherals like LCD controllers. The default reset value is 1 (3-cycle MOVX), ensuring compatibility with common 120ns–150ns RAM without firmware changes.

Does the DS80C310-QCG+T&R include on-chip program memory?

No, the DS80C310-QCG+T&R contains no on-chip program memory. It relies entirely on external ROM or EPROM accessed via the multiplexed P0 address/data bus and P2 address MSB lines. The EA pin must be tied to ground to enable external program fetches. This architecture mirrors the original 80C31/80C32 and supports up to 64kB of external program memory space.

What are the key differences between DS80C310-QCG+T&R and DS80C320-QCG+T&R?

The DS80C310-QCG+T&R is a streamlined version of the DS80C320-QCG+T&R, omitting the watchdog timer, power-fail interrupt, and enhanced serial port with auto-baud detection. Both share identical core architecture, pinout, instruction set, and peripheral count (three timers, one UART, 256-byte RAM). The DS80C310-QCG+T&R maintains upward compatibility - firmware written for it runs unmodified on DS80C320-QCG+T&R - but not vice versa for features exclusive to the latter.