Analog Devices Inc./Maxim Integrated DS80C320-QCG/T&R

Overview

DS80C320-QCG/T&R from Maxim Integrated is a high-speed, 80C32-compatible 8-bit microcontroller with 4-clock-per-machine-cycle architecture, 256 bytes of on-chip RAM, three 16-bit timer/counters, and dual full-duplex hardware serial ports. It operates at up to 25 MHz (0°C to +70°C), supports external 64 kB ROM/RAM addressing, and delivers ~2.5× average instruction speed improvement over standard 80C32 - used in industrial control panels requiring deterministic real-time I/O response.

For engineers reviewing the DS80C320-QCG/T&R datasheet, DS80C320-QCG/T&R pinout, DS80C320-QCG/T&R application, or DS80C320-QCG/T&R equivalent, key selection criteria include its 44-pin PLCC package, dual DPTR support for accelerated memory moves, programmable MOVX stretch timing, power-fail reset/interrupt, and compatibility with legacy 8051 toolchains and PCB layouts.

Technical Context

The DS80C320-QCG/T&R implements a redesigned 8051 core eliminating dummy clock cycles, executing most instructions in 4 oscillator clocks versus 12 in legacy 80C32. Its dual data pointer (DPTR0/DPTR1) enables zero-overhead switching between source/destination addresses during block memory transfers.

Timer/counter operation defaults to 12-clock mode post-reset for backward timing compatibility but can be reconfigured via CKCON register bits to 4-clock mode. MOVX access timing is software-adjustable (2–9 machine cycles) using CKCON.2–0, enabling direct interfacing with slow peripherals like LCD controllers without glue logic.

Key Specifications

Pinout & Package

DS80C320-QCG/T&R is housed in a 44-pin Plastic Leaded Chip Carrier (PLCC) package with J-lead configuration, designed for surface-mount assembly and thermal reliability in industrial environments.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 8-bit microcontroller applications.

Compared with DS80C320-MCG+ and DS80C320-ECL+, the DS80C320-QCG/T&R provides optimal balance of industrial temperature compliance (0°C to +70°C), surface-mount reliability (PLCC), and drop-in compatibility with existing 44-pin PLCC 80C32 footprints - avoiding PCB redesign while enabling faster code execution and enhanced peripheral integration.

Availability

DS80C320-QCG/T&R is available at Aetrix Electronics and suitable for industrial PLCs, legacy system upgrades, smart energy meters, and embedded test equipment requiring stable component supply across multi-year production cycles.

Supply support for DS80C320-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 U.S.-based semiconductor company specializing in high-performance analog and mixed-signal ICs for industrial, communications, and computing applications.

The DS80C320-QCG/T&R belongs to Maxim's high-speed 8051 microcontroller family, engineered to extend the life of 8051-based systems with measurable performance gains while preserving software and hardware investment.

FAQ

What is the maximum crystal frequency supported by DS80C320-QCG/T&R?

The DS80C320-QCG/T&R supports a maximum crystal frequency of 25 MHz across the 0°C to +70°C commercial temperature range. This enables a 4-clock-per-cycle core to achieve an effective instruction throughput of approximately 82.5 MHz. Operation beyond 25 MHz violates the device's validated electrical specifications and may result in timing violations or undefined behavior. The DS80C320-QCL variant supports 33 MHz for applications requiring higher performance.

Is DS80C320-QCG/T&R pin-compatible with standard 80C32 microcontrollers?

Yes, DS80C320-QCG/T&R is fully pin-compatible with the 80C32 in the 44-pin PLCC package. All signal names, pin locations, and electrical characteristics align with the legacy 80C32 footprint. This allows direct PCB-level replacement without layout changes. However, designers must verify timing-critical firmware sections due to the 4-clock-per-cycle execution - especially where delay loops or baud rate generation depend on instruction cycle counts.

How does the dual data pointer (DPTR) in DS80C320-QCG/T&R improve memory operations?

The DS80C320-QCG/T&R implements two independent 16-bit data pointers (DPTR0 at SFR 82h/83h and DPTR1 at 84h/85h), selected via DPS bit (SFR 86h). This eliminates the need to save/restore address registers during block memory moves. For example, a 64-byte transfer executes in 1097 machine cycles instead of 1869 - a 41% reduction - directly improving real-time responsiveness in data-intensive tasks like firmware updates or sensor buffer handling.

Does DS80C320-QCG/T&R include on-chip program memory?

No, DS80C320-QCG/T&R does not include on-chip ROM or EPROM. It is a ROMless variant requiring external program memory accessed via the multiplexed P0 bus and P2 address lines. The EA pin must be tied low to enable external program fetches. This architecture matches the original 80C32 and supports flexible memory configurations - including UV-EPROM, Flash, or masked ROM - while keeping die size and cost optimized for systems with external memory already in place.

What is the function of the MOVX stretch feature in DS80C320-QCG/T&R?

The MOVX stretch feature in DS80C320-QCG/T&R allows software to configure the duration of external data memory read/write strobes (RD/WR) from 2 to 9 machine cycles via CKCON.2–0 bits. This adapts the microcontroller's timing to match slow peripherals - such as character LCDs or legacy DACs - without external wait-state logic. At reset, stretch defaults to 3 cycles (4 clocks), ensuring compatibility with common 120 ns SRAM; setting it to 0 enables minimum 2-cycle access for high-speed memory.