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

Overview

DS80C310-QNG/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 (up to 62.5 MHz apparent throughput at 25 MHz crystal), features dual data pointers for accelerated memory moves, variable-length MOVX access (2–9 machine cycles), and operates across –40°C to +85°C for industrial embedded control applications.

For engineers reviewing the DS80C310-QNG/T&R datasheet, DS80C310-QNG/T&R pinout, DS80C310-QNG/T&R application, or DS80C310-QNG/T&R equivalent, this page delivers verified timing behavior, PLCC-44 package mapping, stretchable external memory interface control, interrupt architecture (10 sources, including INT2–INT5), and drop-in replacement guidance versus legacy 80C31/80C32 designs.

Technical Context

The DS80C310-QNG/T&R implements a 4-clock-per-machine-cycle core-replacing the standard 8051's 12-clock cycle-enabling single-cycle instructions in 160 ns at 25 MHz. Its dual DPTR (DPL/DPH at 82h/83h; DPL1/DPH1 at 84h/85h) and DPS bit (SFR 86h) eliminate redundant address reloads during block transfers.

Timer/counter operation defaults to 12-clock mode on reset for backward timing compatibility but supports optional 4-clock mode via CKCON bits (T0M/T1M/T2M at 8Eh). MOVX timing is software-configurable (CKCON[2:0]) from 2 to 9 machine cycles, enabling glueless interfacing with both fast SRAM and slow peripherals like LCD controllers or UARTs.

Key Specifications

Pinout & Package

DS80C310-QNG/T&R is housed in a 44-pin Plastic Leaded Chip Carrier (PLCC) package with J-lead configuration, RoHS-compliant and lead-free (QNG+ variant). Pin numbering follows standard PLCC top-view layout (pin 1 at corner notch).

Key Features

Applications

Equivalent & Alternatives

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

Compared with DS80C320-QNG+, the DS80C310-QNG/T&R offers identical speed and PLCC-44 compatibility at lower cost and complexity, while the AT89C51RC2-RLTUM trades architectural efficiency for integrated nonvolatile storage-making DS80C310-QNG/T&R optimal for performance-critical, ROM-based industrial upgrades.

Availability

DS80C310-QNG/T&R is available at Aetrix Electronics and suitable for industrial PLC I/O modules, legacy equipment controller upgrades, smart energy meter interfaces, and embedded HMI controllers requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for DS80C310-QNG/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, automotive, and communications applications.

The DS80C310-QNG/T&R belongs to Maxim's high-speed 8051-compatible microcontroller family, designed specifically to accelerate legacy 80C31/80C32-based systems without requiring PCB redesign or firmware rewrite-targeting industrial control, instrumentation, and retrofit markets.

FAQ

Is DS80C310-QNG/T&R pin-compatible with the standard 80C32 in PLCC-44 packages?

Yes, DS80C310-QNG/T&R is fully pin-compatible with the 80C32 in 44-pin PLCC packaging. All signal names, pin locations, and electrical characteristics match-including P0–P3 I/O, RST, EA, XTAL1/XTAL2, and VCC/GND. This enables direct socket replacement in existing 80C32-based designs without PCB modification. The DS80C310-QNG/T&R retains identical interrupt vector mapping and memory interface timing conventions, ensuring hardware-level interoperability.

What is the default MOVX timing setting for DS80C310-QNG/T&R after reset?

After reset, DS80C310-QNG/T&R configures MOVX access to use 3 machine cycles-the stretch value in CKCON[2:0] defaults to 001b. This setting maintains compatibility with legacy 80C32 systems using standard 120 ns or 150 ns SRAM, avoiding timing violations during initial boot. To achieve maximum speed, firmware must explicitly write 000b to CKCON[2:0] to select 2-cycle MOVX operation.

Does DS80C310-QNG/T&R include on-chip program memory (ROM/Flash)?

No, DS80C310-QNG/T&R contains no on-chip program memory. It requires external ROM or EPROM connected via the multiplexed P0 address/data bus and P2 high-order address lines. The EA pin must be tied low (GND) to force all program fetches from external memory. This architecture mirrors the original 80C31/80C32 and enables flexible memory sizing and field-upgradeable firmware stored in replaceable memory devices.

How does DS80C310-QNG/T&R handle timer compatibility with legacy 8051 code?

DS80C310-QNG/T&R defaults timers to 12-clock-per-cycle operation on reset-matching the original 8051 timing-so existing baud rate generators, PWM periods, and delay loops function unchanged. Firmware may optionally configure individual timers (via CKCON bits T0M/T1M/T2M) to run at 4-clock speed for higher resolution or faster counting, but this requires explicit register writes and validation of timing-critical paths.

What industrial temperature range does DS80C310-QNG/T&R support?

DS80C310-QNG/T&R is rated for continuous operation from –40°C to +85°C, meeting industrial-grade environmental requirements. This specification is guaranteed across the full voltage range (4.5 V to 5.5 V) and applies to all DC and AC electrical parameters-including active current (30 mA @ 25 MHz), stop mode leakage (1 µA), and MOVX timing margins. No derating is required within this range.