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

Overview

DS80C320-ECG/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 (TQFP package), supports 4.25V–5.5V supply, and delivers ~2.5× speed improvement over standard 8051 for same code and crystal - used in industrial control panels requiring deterministic real-time I/O response.

For engineers reviewing the DS80C320-ECG/T&R datasheet, DS80C320-ECG/T&R pinout, DS80C320-ECG/T&R application, or DS80C320-ECG/T&R equivalent, key selection considerations include TQFP-44 package compatibility, stretchable MOVX timing for mixed-speed peripherals, dual DPTR support for efficient memory block moves, and power-fail reset/interrupt capability for robust embedded systems.

Technical Context

The DS80C320-ECG/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 transfers.

Memory access is decoupled: program fetches run at fixed 4-clock cycle 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 like LCD controllers or legacy SRAM without glue logic.

Key Specifications

Pinout & Package

DS80C320-ECG/T&R is housed in a 44-pin Thin Quad Flat Package (TQFP) with exposed thermal pad (RoHS-compliant, lead-free). Pin numbering follows standard TQFP top-view orientation (pin 1 marked by dot or bevel).

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-ECG/T&R offers optimal balance of industrial-grade reliability (0°C to +70°C), compact TQFP-44 packaging, and proven 25 MHz timing margin - making it the preferred choice for cost-sensitive, volume-manufactured control modules where extended temperature or DIP form factor are unnecessary.

Availability

DS80C320-ECG/T&R is available at Aetrix Electronics and suitable for industrial PLCs, medical device UIs, energy meter gateways, and legacy equipment retrofits requiring stable component supply across multi-year production cycles.

Supply support for DS80C320-ECG/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 precision analog, mixed-signal, and high-reliability microcontrollers for industrial, medical, and communications applications.

The DS80C320-ECG/T&R belongs to Maxim's high-speed 8051-compatible microcontroller family, designed specifically to extend the lifecycle of legacy 80C32-based systems while delivering measurable performance, integration, and power efficiency gains.

FAQ

What is the maximum operating frequency of the DS80C320-ECG/T&R?

The DS80C320-ECG/T&R is rated for a maximum crystal frequency of 25 MHz in its specified 0°C to +70°C temperature range. At this clock speed, it achieves a peak throughput of 62.5 million instructions per second (MIPS) with single-cycle instructions completing in 121 ns. This rating is confirmed in the official Maxim ordering information table for the ECG package variant.

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

No, the DS80C320-ECG/T&R does not contain on-chip ROM or EPROM. It is a ROMless variant that relies on external program memory accessed via the multiplexed P0 address/data bus and P2 high-order address lines. The EA pin must be held LOW to enable external program fetches - a defining characteristic of the DS80C320 series versus ROM-equipped derivatives.

How does the dual data pointer in the DS80C320-ECG/T&R improve firmware efficiency?

The DS80C320-ECG/T&R provides two independent 16-bit data pointers (DPTR0 at SFR 82h/83h and DPTR1 at 84h/85h), selected via the DPS bit (SFR 86h). This eliminates the need to save/restore address registers during memory block moves. As demonstrated in Maxim's reference code, a 64-byte transfer executes in 1097 machine cycles instead of 1869 - a 41% reduction directly attributable to the DS80C320-ECG/T&R's dual DPTR hardware.

Can the DS80C320-ECG/T&R interface with slow peripherals like character LCDs?

Yes, the DS80C320-ECG/T&R supports variable-speed MOVX operations via the CKCON register (SFR 8Eh). Software can configure read/write strobe widths from 2 to 9 machine cycles - for example, selecting 7 cycles yields an 1120 ns strobe at 25 MHz, comfortably meeting the 1 µs minimum enable pulse requirement of common HD44780-based LCD modules without external timing logic.

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

Yes, the DS80C320-ECG/T&R is fully pin-compatible with the industry-standard 80C32 in the 44-pin TQFP package. All I/O ports, control signals (RST, ALE, PSEN), and peripheral pins (XTAL1/2, RXD0/TXD0, INT0/1, T0/T1, WR/RD) occupy identical positions. This allows direct PCB-level replacement in existing 80C32 designs, provided external memory timing and power supply meet DS80C320-ECG/T&R specifications.