Analog Devices Inc./Maxim Integrated DS80C310-ECG+

Overview

DS80C310-ECG+ from Maxim Integrated is a high-speed, 8051-compatible CMOS microcontroller in 44-pin TQFP package, executing standard 8051 instructions at up to 3× speed (25MHz crystal → ~62.5MHz apparent throughput), featuring dual data pointers, variable-speed MOVX access (2–9 machine cycles), three 16-bit timer/counters, full-duplex serial port, and 256 bytes of on-chip RAM - used in industrial control systems requiring deterministic real-time response with legacy 8051 code compatibility.

For engineers reviewing the DS80C310-ECG+ datasheet, DS80C310-ECG+ pinout, DS80C310-ECG+ application, or DS80C310-ECG+ equivalent, key selection considerations include its 4-clock-per-machine-cycle core, programmable MOVX stretch timing for mixed-speed peripherals, upward compatibility with DS80C320, and support for external 64kB ROM/RAM via multiplexed address/data bus.

Technical Context

The DS80C310-ECG+ implements a streamlined 8051 architecture with no dummy memory cycles, using 4 oscillator clocks per machine cycle versus the legacy 12-clock cycle - enabling single-cycle instructions in 160ns at 25MHz. Its dual DPTR (DPL/DPH at 82h/83h; DPL1/DPH1 at 84h/85h) and DPS bit (SFR 86h) accelerate block memory transfers without software overhead.

Timer/counter operation defaults to 12-clock mode for backward timing compatibility but is individually configurable to 4-clock mode via CKCON bits (T0M/T1M/T2M at SFR 8Eh); MOVX access timing is independently adjustable (CKCON.2–CKCON.0) from 2 to 9 machine cycles to interface with slow peripherals like LCD controllers or UARTs without glue logic.

Key Specifications

Pinout & Package

DS80C310-ECG+ uses a 44-pin Thin Quad Flat Package (TQFP) with 0.8mm lead pitch and exposed thermal pad. Pin functions follow standard 8051 I/O mapping with enhanced alternate functions on Port 1 (INT2–INT5, T2/T2EX) and Port 3 (RXD0/TXD0, INT0/INT1, T0/T1, RD/WR).

Key Features

Applications

Equivalent & Alternatives

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

Compared with DS80C320-QNG+, DS80C310-ECG+ offers identical speed and pin compatibility but omits watchdog and secondary UART - making it optimal for legacy upgrades where those features are unused. Against AT89C51RC2-ISP, DS80C310-ECG+ delivers 2.5× throughput and external memory support at the cost of requiring external ROM/RAM layout.

Availability

DS80C310-ECG+ is available at Aetrix Electronics and suitable for industrial control systems, legacy equipment retrofits, smart metering gateways, and automated test equipment requiring stable component supply across extended product lifecycles.

Supply support for DS80C310-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 precision analog, mixed-signal, and high-reliability microcontrollers for industrial, medical, and communications applications.

The DS80C310-ECG+ belongs to Maxim's high-speed 8051 microcontroller family, designed specifically to extend the life of legacy 8051-based systems through performance uplift without software or PCB changes.

FAQ

What is the maximum operating frequency of the DS80C310-ECG+?

The DS80C310-ECG+ supports a maximum crystal frequency of 25MHz. With its 4-clock-per-machine-cycle architecture, this yields an effective instruction execution rate of approximately 62.5MHz - significantly faster than legacy 8051 devices running at the same crystal speed. The device operates across 0°C to +70°C ambient temperature.

Is the DS80C310-ECG+ pin-compatible with standard 80C32 microcontrollers?

Yes, the DS80C310-ECG+ is fully pin-compatible with the 80C32 in its 44-pin TQFP package. It retains identical pin assignments for P0–P3, RST, EA, ALE, PSEN, XTAL1/XTAL2, VCC, and GND. Alternate functions on Port 1 (INT2–INT5) and Port 3 are implemented without affecting standard 80C32 signal routing.

How does the dual data pointer feature improve firmware performance in the DS80C310-ECG+?

The DS80C310-ECG+ implements two independent 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 addresses during memory block moves - reducing typical memcpy() overhead by 4–6 instruction cycles per transfer and accelerating buffer management in communication stacks or display drivers.

Can the DS80C310-ECG+ interface directly with slow peripherals like LCD modules?

Yes, the DS80C310-ECG+ supports direct interfacing with slow peripherals via its programmable MOVX timing control. Using CKCON bits (SFR 8Eh), MOVX read/write strobe width can be stretched from 2 to 9 machine cycles - allowing reliable communication with devices such as character LCDs (response time >100µs) without external wait-state logic or firmware polling delays.

Does the DS80C310-ECG+ include on-chip program memory?

No, the DS80C310-ECG+ contains no on-chip ROM or flash memory. It relies entirely on external program memory accessed via the multiplexed P0 address/data bus and P2 upper address lines. The EA pin must be tied low to enable external code fetches - consistent with the 80C31/80C32 architecture it replaces.