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 4 clocks/machine cycle (vs. 12 in standard 8051), delivers up to 62.5 MHz apparent execution speed at 25 MHz crystal, includes three 16-bit timer/counters, 256 bytes of on-chip RAM, and a full-duplex serial port. 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 44-pin PLCC package, 25 MHz max clock, dual data pointer support, variable MOVX timing (2–9 cycles), and upward compatibility with DS80C320 while omitting some peripherals.

Technical Context

The DS80C310-QCG/T&R implements a streamlined 8051 core with no dummy memory cycles, achieving 1.5×–3× instruction speedup over standard 8051 at identical crystal frequency. Its architecture uses 4-clock machine cycles, enabling single-cycle instructions in 160 ns at 25 MHz, and retains backward compatibility via reset-default 12-clock timer operation.

It supports external memory expansion up to 64 kB ROM and 64 kB RAM via multiplexed Port 0 (AD0–AD7) and Port 2 (A8–A15), with programmable MOVX access stretch (CKCON bits M2–M0) to interface with slow peripherals or memory without glue logic. Dual DPTRs (DPTR0 at 82h/83h, DPTR1 at 84h/85h) accelerate block memory moves via DPS bit toggle.

Key Specifications

Pinout & Package

DS80C310-QCG/T&R is housed in a 44-pin Plastic Leaded Chip Carrier (PLCC) package with J-lead configuration, rated for 0°C to +70°C operation. Pin functions align with standard 80C32 but add enhanced interrupt inputs (INT2–INT5 on P1.4–P1.7) and dual DPTR control.

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/T&R provides identical core performance and pin compatibility at lower cost and complexity, while AT89C51RC2-RLTUM trades legacy compatibility for modern Flash integration and different packaging - making DS80C310-QCG/T&R optimal for verified 80C32 socket upgrades requiring minimal change.

Availability

DS80C310-QCG/T&R is available at Aetrix Electronics and suitable for industrial control, medical instrumentation, and smart metering applications requiring stable component supply, long-lifecycle support, and proven 8051 upgrade paths.

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 precision analog, mixed-signal, and high-reliability microcontrollers for industrial, medical, and communications markets.

The DS80C310-QCG/T&R belongs to Maxim's high-speed 8051 microcontroller family, designed specifically to extend the life of legacy 80C31/32-based systems through performance-enhanced, pin-compatible upgrades without firmware rewrite.

FAQ

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

Yes, DS80C310-QCG/T&R is fully pin-compatible with the 80C32 in its 44-pin PLCC package variant. All signal names, pin positions, and electrical characteristics match - including Port 0 (AD0–AD7), Port 2 (A8–A15), Port 3 (RXD0/TXD0/INT0/INT1), and control signals (ALE, PSEN, EA). This enables direct socket replacement in existing 80C32 designs without PCB changes.

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

The DS80C310-QCG/T&R supports a maximum crystal frequency of 25 MHz, as specified in the Ordering Information table and confirmed in the General Description. At this frequency, the device achieves an apparent execution speed of approximately 62.5 MHz due to its 4-clock-per-machine-cycle architecture - delivering a typical 2.5× speed improvement over standard 80C32 operation.

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

No, DS80C310-QCG/T&R 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 tied low to enable external code fetches, and PSEN serves as the active-low chip enable for external ROM devices.

How does the dual data pointer (DPTR) function in DS80C310-QCG/T&R?

In DS80C310-QCG/T&R, dual DPTRs consist of DPTR0 (SFR addresses 82h/83h) and DPTR1 (84h/85h), selected by the DPS bit (86h.0). Software toggles DPS to switch between pointers, enabling efficient block memory moves - e.g., loading source address into DPTR0 and destination into DPTR1, then using MOVX instructions without intermediate register saves. This reduces instruction count and improves throughput in data-intensive operations.

Can DS80C310-QCG/T&R interface with slow peripherals like LCD controllers?

Yes, DS80C310-QCG/T&R supports slow peripherals via its programmable MOVX timing feature. Using CKCON bits M2–M0 (8Eh.2–8Eh.0), software configures MOVX access duration from 2 to 9 machine cycles. For example, setting stretch value 7 yields a 9-cycle MOVX with 1120 ns strobe width at 25 MHz - providing ample setup/hold time for character LCDs, EEPROMs, or legacy UARTs without external wait-state logic.