Analog Devices Inc./Maxim Integrated DS80C320-ECG

Overview

DS80C320-ECG from Maxim Integrated is a high-speed, 80C32-compatible 8-bit microcontroller in 44-pin TQFP package, operating at up to 25 MHz with 4-clock-per-machine-cycle architecture, 256 bytes of on-chip RAM, dual hardware serial ports, and programmable watchdog timer - used in industrial control systems requiring deterministic real-time response and legacy 8051 code compatibility.

For engineers reviewing the DS80C320-ECG datasheet, DS80C320-ECG pinout, DS80C320-ECG application, or DS80C320-ECG equivalent, key selection considerations include its 25 MHz max clock speed at 0°C to +70°C, dual DPTR support for accelerated memory moves, variable MOVX cycle stretching (2–9 cycles), and pin compatibility with standard 80C32 designs in TQFP footprint.

Technical Context

The DS80C320-ECG implements a redesigned 8051 core executing instructions in 4 oscillator clocks per machine cycle - achieving ~2.5× average speedup over legacy 80C32 - while maintaining full instruction set and SFR backward compatibility. Its dual data pointers (DPTR0 at 82h/83h, DPTR1 at 84h/85h) enable zero-overhead switching between source and destination addresses during block transfers.

Peripherals include two independent full-duplex UARTs (Serial Port 0 on P3.0/P3.1; Serial Port 1 on P1.2/P1.3), three 16-bit timer/counters (T0/T1/T2), power-fail reset and interrupt, and a programmable watchdog timer. Memory access timing is configurable via CKCON register (8Eh), supporting mixed-speed external RAM/peripherals without glue logic.

Key Specifications

Pinout & Package

DS80C320-ECG is housed in a 44-pin Thin Quad Flat Package (TQFP) with 0.8 mm lead pitch, thermally enhanced for industrial ambient operation. Pin functions are identical across DS80C320 variants in TQFP; pin numbering follows JEDEC MO-153 standard.

Key Features

Applications

Equivalent & Alternatives

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

Compared with DS80C320-QCG and DS80C320-MCG, the DS80C320-ECG provides optimal balance of I/O count, thermal performance, and PCB area efficiency in industrial control - its 44-pin TQFP enables full 16-bit addressing and dual UART routing without compromising board real estate or manufacturability.

Availability

DS80C320-ECG is available at Aetrix Electronics and suitable for industrial automation, legacy equipment modernization, and smart metering applications requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant manufacturing.

Supply support for DS80C320-ECG 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 processing solutions for industrial, automotive, and communications markets.

The DS80C320-ECG belongs to Maxim's high-speed 8051 microcontroller product line, designed specifically to extend the life of legacy 80C32-based systems while delivering measurable performance gains - targeting applications where code compatibility, deterministic timing, and industrial temperature range are critical.

FAQ

What is the maximum operating frequency of the DS80C320-ECG?

The DS80C320-ECG is rated for a maximum crystal frequency of 25 MHz across the 0°C to +70°C commercial temperature range. This yields a machine cycle time of 160 ns (4 clocks per cycle), enabling single-cycle instructions to execute in 160 ns - significantly faster than the 12-clock 80C32 architecture. The DS80C320-ECG datasheet specifies this limit under DC characteristics and must be observed to ensure timing compliance.

Is the DS80C320-ECG pin-compatible with standard 80C32 microcontrollers?

Yes, the DS80C320-ECG is fully pin-compatible with the 80C32 in the 44-pin TQFP package. All signal names, pin positions, and electrical characteristics match - including P0–P3 I/O, RST, XTAL1/XTAL2, PSEN, ALE, EA, and VCC/GND. This allows direct replacement in existing 80C32 designs without PCB modification, though firmware timing adjustments may be needed for high-speed peripherals.

How does the dual data pointer feature improve performance in the DS80C320-ECG?

The DS80C320-ECG implements two independent 16-bit data pointers (DPTR0 at 82h/83h, DPTR1 at 84h/85h), selected via DPS bit (86h.0). This eliminates software overhead in memory block moves: a 64-byte transfer drops from 1869 to 1097 machine cycles - saving 772 cycles (123.5 µs at 25 MHz). The DS80C320-ECG uses this to accelerate DMA-like operations without external hardware.

What are the key differences between DS80C320-ECG and DS80C323 variants?

The DS80C320-ECG operates from 4.25 V to 5.5 V with 25 MHz max clock, while the DS80C323-ECD supports 2.7 V to 5.5 V but is limited to 18 MHz. Both share identical peripherals, pinout, and instruction set - but DS80C320-ECG targets high-performance 5 V industrial systems, whereas DS80C323-ECD suits battery-powered or low-voltage applications where speed is secondary to power efficiency.

Does the DS80C320-ECG include on-chip program memory?

No, the DS80C320-ECG contains no on-chip ROM or EPROM - it is a ROMless variant like the 80C32. Program code must be executed from external memory mapped to the 64 kB program space, enabled by tying the EA pin low. The DS80C320-ECG relies on external parallel NOR Flash or EEPROM, accessed via P0 (AD0–AD7), P2 (A8–A15), and control signals PSEN, ALE, RD, and WR.