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 hardware serial ports. It operates from 4.25V to 5.5V across –40°C to +85°C, housed in a 40-pin plastic DIP package, and targets industrial control upgrades requiring deterministic real-time performance without PCB redesign.

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 rating (–40°C to +85°C), dual DPTR support for accelerated memory moves, programmable MOVX stretch timing, power-fail reset/interrupt, and watchdog timer - all while maintaining full 8051 instruction set and pin compatibility with legacy 80C32 designs.

Technical Context

The DS80C320-MNG implements a redesigned 8051 core eliminating wasted clock cycles: every instruction executes in 4, 8, or up to 28 oscillator cycles (vs. 12/24 in standard 80C32), delivering ~2.5× average speedup at same crystal frequency. Its dual data pointer (DPTR0/DPTR1) enables single-instruction switching between source and destination addresses during block transfers.

Memory access is decoupled: program fetches run at fixed 4-cycle-per-instruction rate, while off-chip data memory (MOVX) timing is software-configurable via CKCON register (SFR 8Eh), supporting 2–9 machine-cycle strobes to interface with slow peripherals or legacy RAM without glue logic. Timers default to 12-cycle mode on reset for backward timing compatibility but can be reconfigured to 4-cycle operation.

Key Specifications

Pinout & Package

DS80C320-MNG is supplied in a 40-pin plastic dual in-line package (PDIP) with 0.6-inch body width and through-hole mounting. Pin functions align with industry-standard 80C32 layout, enabling drop-in replacement in existing designs.

Key Features

Applications

Equivalent & Alternatives

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

Compared with DS80C320-MCL and DS80C323-MCD, the DS80C320-MNG uniquely balances extended temperature operation (–40°C to +85°C), 25 MHz speed, and 5 V compatibility - making it the sole option among these three for ruggedized industrial upgrades requiring guaranteed performance across full industrial thermal range.

Availability

DS80C320-MNG is available at Aetrix Electronics and suitable for industrial control systems, legacy 8051 equipment modernization, and smart metering platforms 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) is a semiconductor company specializing in precision analog, mixed-signal, and high-reliability microcontrollers for industrial, medical, and communications applications.

The DS80C320-MNG belongs to Maxim's high-speed 8051-compatible microcontroller family, designed specifically to deliver measurable performance uplift in legacy 80C32-based systems while preserving software and hardware investment.

FAQ

Is DS80C320-MNG pin-compatible with standard 80C32 microcontrollers?

Yes, DS80C320-MNG is fully pin-compatible with the 80C32 in the 40-pin DIP package. All signal names, positions, and electrical characteristics match - including VCC, GND, RST, XTAL1/XTAL2, P0–P3 I/O ports, and control signals like ALE, PSEN, RD, and WR. This enables direct replacement in existing 80C32 designs without PCB modification.

What is the maximum operating frequency of DS80C320-MNG and under what conditions?

The DS80C320-MNG is rated for a maximum clock frequency of 25 MHz across its specified industrial temperature range of –40°C to +85°C. This rating is validated per Maxim's datasheet ordering table for the -MNG suffix variant and applies when powered from 4.25 V to 5.5 V. Exceeding 25 MHz may result in timing violations or functional failure.

Does DS80C320-MNG include on-chip flash or ROM memory?

No, DS80C320-MNG does not contain on-chip program memory. Like the original 80C32, it relies on external ROM or EPROM accessed via P0 (multiplexed address/data) and P2 (upper address A8–A15), with EA pin held low. It does include 256 bytes of on-chip scratchpad RAM, accessible without external bus cycles.

How does the dual data pointer (DPTR) 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 (SFR 86h). This eliminates the need to save/restore address registers during memory block moves - reducing a 64-byte copy from 1869 to 1097 machine cycles at 25 MHz. The DS80C320-MNG thus accelerates data-intensive operations like EEPROM programming or display buffer updates.

Can DS80C320-MNG operate with a 3.3 V supply?

No, DS80C320-MNG requires a minimum supply voltage of 4.25 V and is specified only for 4.25 V to 5.5 V operation. For 3.3 V compatibility, consider the DS80C323-MCD variant, which supports 2.7 V to 5.5 V but has a lower 18 MHz max clock rating and different temperature grading. Using DS80C320-MNG below 4.25 V risks undefined behavior or failure to meet timing specifications.