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

Overview

DS80C320-ECL/T&R from Maxim Integrated is a high-speed, 80C32-compatible 8-bit microcontroller with 4-clock-per-machine-cycle architecture, 33MHz max crystal frequency, 256 bytes on-chip RAM, dual hardware serial ports, and programmable watchdog timer - deployed in industrial control systems requiring deterministic real-time response and legacy 8051 code compatibility.

For engineers reviewing the DS80C320-ECL/T&R datasheet, DS80C320-ECL/T&R pinout, DS80C320-ECL/T&R application, or DS80C320-ECL/T&R equivalent, key selection considerations include its 40-pin DIP/44-pin PLCC/TQFP package options, 33MHz operation at 4.25V–5.5V, dual DPTR support for accelerated memory moves, stretchable MOVX timing, and pin-compatibility with standard 80C32 designs.

Technical Context

The DS80C320-ECL/T&R implements a redesigned 8051 core eliminating dummy clock cycles, executing most instructions in 4 oscillator cycles (vs. 12 in legacy 80C32), delivering ~2.5× average speedup. Its dual data pointer (DPTR0/DPTR1) enables zero-overhead switching between source and destination addresses during block transfers.

Timing flexibility is achieved via the Clock Control Register (CKCON @ 8Eh): MOVX strobe width is programmable from 2 to 9 machine cycles (80–1120 ns at 25MHz), and timers default to 12-cycle mode for backward compatibility but can be reconfigured to 4-cycle operation for higher resolution.

Key Specifications

Pinout & Package

DS80C320-ECL/T&R is housed in a 44-pin Thin Quad Flat Package (TQFP) with 0.8mm lead pitch and exposed thermal pad. Pin numbering follows standard TQFP top-view convention (pin 1 marked by dot or notch).

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-ECL/T&R delivers superior thermal dissipation and smaller PCB footprint in TQFP; compared with DS80C323-ECD+, it provides higher deterministic throughput at 33MHz while retaining full 80C32 software compatibility.

Availability

DS80C320-ECL/T&R is available at Aetrix Electronics and suitable for industrial control systems, legacy equipment retrofits, multi-protocol gateways, and embedded test instrumentation requiring stable component supply across long production lifecycles.

Supply support for DS80C320-ECL/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 high-performance analog, mixed-signal, and embedded solutions for industrial, communications, and computing markets.

The DS80C320-ECL/T&R belongs to Maxim's high-speed 8051-compatible microcontroller family, designed specifically to extend the life of legacy 80C32-based systems while delivering measurable performance uplift without software rewrite.

FAQ

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

The DS80C320-ECL/T&R supports a maximum crystal frequency of 33MHz, enabling an effective instruction throughput of approximately 82.5MHz due to its 4-clock-per-machine-cycle architecture. This specification is validated for the ECL variant in 44-pin TQFP packaging across 0°C to +70°C ambient conditions, as confirmed in Maxim's official ordering table and electrical characteristics section.

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

Yes, DS80C320-ECL/T&R is fully pin-compatible with the industry-standard 80C32 in all three package variants (DIP, PLCC, TQFP), including identical pin functions for P0–P3, RST, XTAL1/XTAL2, PSEN, ALE, EA, and VCC/GND. This compatibility is explicitly stated in the "80C32 COMPATIBILITY" section and verified in the pin configuration diagrams for DS80C320/DS80C323.

How does the dual data pointer (DPTR) in DS80C320-ECL/T&R improve memory transfer performance?

The DS80C320-ECL/T&R 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 address registers during block moves - a 64-byte transfer executes in 1097 machine cycles versus 1869 with single DPTR, saving 772 cycles (123.5µs at 25MHz), as demonstrated in the official application example.

Does DS80C320-ECL/T&R include on-chip program memory (ROM/Flash)?

No, DS80C320-ECL/T&R contains no on-chip program memory. It implements an 80C32-compatible external memory interface with 64kB program space addressed via P0 (AD0–AD7) and P2 (A8–A15), requiring external ROM or Flash. The EA pin must be tied low to enable external program fetch, consistent with 80C32 architecture and confirmed in the "MEMORY ACCESS" and "PIN DESCRIPTION" sections.

What is the function of the CKCON register in DS80C320-ECL/T&R?

The CKCON register (SFR address 8Eh) controls timing behavior in DS80C320-ECL/T&R: bits CKCON.2–0 configure MOVX strobe width (2–9 machine cycles), while CKCON.3–5 independently select 4- or 12-clock-per-cycle operation for Timers 0–2. Default reset value configures 3-cycle MOVX and 12-cycle timers - ensuring backward compatibility with legacy 80C32 timing expectations.