Analog Devices Inc./Maxim Integrated DS80C320-MNG+

Overview

DS80C320-MNG+ 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 from 4.25V to 5.5V across –40°C to +85°C and targets industrial control, embedded instrumentation, and legacy 8051 system upgrades requiring deterministic real-time performance.

For engineers reviewing the DS80C320-MNG+ datasheet, DS80C320-MNG+ pinout, DS80C320-MNG+ application, or DS80C320-MNG+ equivalent, key selection considerations include its 25 MHz max clock speed in the –40°C to +85°C grade, 40-pin PDIP package, stretchable MOVX timing for mixed-speed memory/peripheral interfacing, dual data pointer for accelerated block transfers, and power-fail reset/interrupt support.

Technical Context

The DS80C320-MNG+ implements a redesigned 8051 core eliminating wasted clock cycles - executing most instructions in 4 oscillator cycles versus 12 in standard 80C32, yielding ~2.5× average speedup at same crystal frequency. Its instruction timing remains binary-compatible but requires recalculation of software delays due to variable-cycle MOVX (2–9 machine cycles) and configurable timer clock dividers (4× or 12×).

Peripherals include two independent UARTs (Serial Port 0 on P3.0/P3.1; Serial Port 1 on P1.2/P1.3), programmable watchdog timer, early-warning power-fail interrupt, and power-fail reset - all controlled via non-overlapping SFRs. Memory addressing follows standard 80C32 layout: 64kB program space, 64kB external data space, with Port 0 as multiplexed AD0–AD7 and Port 2 as A8–A15.

Key Specifications

Pinout & Package

DS80C320-MNG+ is housed in a 40-pin plastic DIP (dual in-line package) with 0.6-inch body width and 0.1-inch pin pitch. Pin functions follow standard 80C32 mapping with enhancements including dedicated P1.2/P1.3 for Serial Port 1 and P1.4–P1.7 for additional external interrupts (INT2–INT5).

Key Features

Applications

Equivalent & Alternatives

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

Compared with DS80C320-MCL+, the DS80C320-MNG+ trades 8 MHz clock headroom for guaranteed operation down to –40°C - critical for outdoor or factory-floor deployment. Against AT89C51RD2-SLSUM, DS80C320-MNG+ provides deterministic external memory timing, dual UARTs, and hardware-level power-fail response - making it superior for industrial control where reliability trumps code density.

Availability

DS80C320-MNG+ is available at Aetrix Electronics and suitable for industrial automation, medical device retrofitting, and test equipment requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for DS80C320-MNG+ 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) designs precision analog, mixed-signal, and high-reliability microcontrollers for demanding industrial, medical, and automotive applications.

The DS80C320-MNG+ belongs to Maxim's high-speed 8051-compatible microcontroller family, engineered specifically to extend legacy 80C32 designs with deterministic real-time performance, robust power management, and peripheral integration - without requiring architectural retraining.

FAQ

What is the maximum crystal frequency supported by DS80C320-MNG+?

The DS80C320-MNG+ supports a maximum crystal frequency of 25 MHz, validated across its full –40°C to +85°C operating temperature range. This yields a minimum instruction cycle time of 160 ns (4 clocks × 40 ns), enabling deterministic timing for real-time control loops and serial communication at standard baud rates without software compensation.

Does DS80C320-MNG+ include on-chip program memory?

No, the DS80C320-MNG+ does not contain on-chip ROM or Flash. It is a ROMless variant designed to execute code from external program memory - consistent with the 80C32 architecture. The EA pin must be tied low to enable external program fetches, and the device supports up to 64 kB of external ROM using Port 0 and Port 2 for address/data multiplexing.

How does the dual data pointer in DS80C320-MNG+ improve firmware efficiency?

The DS80C320-MNG+ implements two independent 16-bit data pointers (DPTR0 at 82h/83h, DPTR1 at 84h/85h) selected via DPS bit (86h). This eliminates the need to save/restore addresses during memory block moves - reducing a 64-byte transfer from 1869 to 1097 machine cycles at 25 MHz, saving 123.5 µs per operation and simplifying buffer management in communication stacks.

Can DS80C320-MNG+ operate with a 3.3 V supply?

No, the DS80C320-MNG+ requires a 4.25 V to 5.5 V supply and is not compatible with 3.3 V logic systems. For 2.7 V to 5.5 V operation, Maxim offers the pin-compatible DS80C323 variant (e.g., DS80C323-QND+), which shares the same peripheral set and instruction timing but supports lower-voltage operation - though at reduced maximum clock speed (18 MHz).

What is the function of the Stretch MOVX feature in DS80C320-MNG+?

The Stretch MOVX feature in DS80C320-MNG+ allows software to configure external data memory access timing from 2 to 9 machine cycles via CKCON.2–0 bits. This enables direct interfacing with slow peripherals like character LCDs or legacy UARTs without external wait-state generators, while retaining full-speed access to fast SRAM - all under firmware control with no hardware changes required for DS80C320-MNG+.