Analog Devices Inc./Maxim Integrated DS80C320-ECL+

Overview

DS80C320-ECL+ from Maxim Integrated is a high-speed, 80C32-compatible 8-bit microcontroller featuring a 4-clock-per-machine-cycle core, 33MHz maximum crystal frequency, 256 bytes of on-chip RAM, dual hardware serial ports, and programmable watchdog timer. It operates from 4.25V to 5.5V and targets legacy 8051-based industrial control and communication systems requiring performance uplift without architectural overhaul.

For engineers reviewing the DS80C320-ECL+ datasheet, DS80C320-ECL+ pinout, DS80C320-ECL+ application, or DS80C320-ECL+ equivalent, key selection considerations include its 4-clock architecture vs. standard 8051, variable MOVX memory access stretch (2–9 cycles), dual data pointer for accelerated block moves, 13-interrupt capability with six external sources, and TQFP-44 package compatibility with existing 80C32 layouts.

Technical Context

The DS80C320-ECL+ implements a redesigned 8051-compatible core eliminating dummy clock cycles, delivering 2.5× average instruction speedup over the 80C32 at identical crystal frequencies. Its dual serial ports (UART0 on P3.0/P3.1, UART1 on P1.2/P1.3) operate independently with separate SFRs (SCON0/SCON1, SBUF0/SBUF1), and both support timer-driven baud rates-though UART1 uses Timer 1 exclusively.

Timing behavior is configurable via the Clock Control Register (CKCON @ 0x8E): bits CKCON.2–0 set MOVX stretch (2–9 machine cycles), while CKCON.3–5 individually select 4- or 12-clock timing for Timers 0–2. On reset, timers default to 12-clock mode for backward compatibility, and MOVX defaults to 3-cycle operation-enabling drop-in replacement in legacy designs using standard-speed RAM.

Key Specifications

Pinout & Package

DS80C320-ECL+ is housed in a 44-pin Thin Quad Flat Package (TQFP) with 0.8mm lead pitch, compatible with industry-standard PCB footprints for 44-pin TQFP microcontrollers. Thermal pad exposed on underside for enhanced heat dissipation in continuous operation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with DS80C320-QCL+ and DS80C320-MCL+, the DS80C320-ECL+ offers optimal thermal dissipation and PCB area efficiency in 44-pin TQFP, making it the preferred choice for volume-manufactured industrial controllers where layout density and long-term reliability are critical.

Availability

DS80C320-ECL+ is available at Aetrix Electronics and suitable for industrial automation, medical device control, secure access terminals, and energy metering applications requiring stable component supply across extended product lifecycles.

Supply support for DS80C320-ECL+ 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 DS80C320-ECL+ belongs to Maxim's high-speed 8051-compatible microcontroller family, designed specifically to extend the life of legacy 8051-based systems with measurable performance gains while preserving software and hardware investment.

FAQ

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

The DS80C320-ECL+ supports a maximum crystal frequency of 33MHz, enabling an apparent instruction execution rate of up to 82.5MHz due to its 4-clock-per-machine-cycle architecture. This specification is confirmed in the Ordering Information table and Electrical Characteristics section of the official Maxim datasheet, and applies specifically to the DS80C320-ECL+ variant with TQFP-44 packaging and commercial temperature range (0°C to +70°C).

Does DS80C320-ECL+ include on-chip Flash or ROM memory?

No, the DS80C320-ECL+ does not contain any on-chip program memory. It is a ROMless microcontroller requiring external program memory accessed via the multiplexed P0 address/data bus and P2 high-order address lines. It does include 256 bytes of on-chip scratchpad RAM. This architecture is explicitly stated in the Detailed Description and Memory Access sections of the Maxim datasheet and is consistent across all DS80C320 variants, including DS80C320-ECL+.

How many hardware serial ports does DS80C320-ECL+ provide, and what pins are used?

The DS80C320-ECL+ provides two independent full-duplex hardware UARTs. UART0 uses P3.0 (RXD0) and P3.1 (TXD0); UART1 uses P1.2 (RXD1) and P1.3 (TXD1). Both ports have dedicated SFRs (SCON0/SCON1, SBUF0/SBUF1) and support standard 8051 serial modes. This dual-serial capability is a defining feature of the DS80C320-ECL+ and is documented in the Peripheral Overview and Pin Description sections of the Maxim datasheet.

Is DS80C320-ECL+ pin-compatible with standard 80C32 microcontrollers?

Yes, the DS80C320-ECL+ is pin-compatible with the standard 80C32 in its 44-pin TQFP package configuration. The pin functions, I/O port mappings, and peripheral signal assignments match those of the 80C32, enabling direct replacement in existing designs. This compatibility is explicitly affirmed in the 80C32 Compatibility section and Pin Configurations diagram of the Maxim datasheet for DS80C320-ECL+.

What is the purpose of the MOVX stretch feature in DS80C320-ECL+?

The MOVX stretch feature in DS80C320-ECL+ allows software to configure the number of machine cycles (2–9) used for external data memory read/write operations via the CKCON register (bits 2–0). This enables reliable interfacing with both fast SRAM and slow peripherals (e.g., LCD controllers) on the same data bus without external wait-state logic. The feature is detailed in the Stretch Memory Cycle section of the Maxim datasheet and applies identically to all DS80C320 variants, including DS80C320-ECL+.