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Analog Devices Inc./Maxim Integrated DS80C320-FNG+
- Part No.:
- DS80C320-FNG+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Microcontrollers
- Package:
- 44-QFP
- Datasheet:
-
DS80C320-FNG+.pdf
- Description:
- IC MCU 8BIT ROMLESS 44MQFP
- Quantity:
- Payment:
- Shipping:
Inventory:2,285
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Product details
Overview
DS80C320-FNG+ 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 from 4.25V to 5.5V at up to 33MHz crystal frequency and targets industrial control, embedded instrumentation, and legacy 8051 system upgrades requiring deterministic real-time performance.
For engineers reviewing the DS80C320-FNG+ datasheet, DS80C320-FNG+ pinout, DS80C320-FNG+ application, or DS80C320-FNG+ equivalent, key selection considerations include its 33MHz max clock speed, dual DPTR support for accelerated memory moves, programmable MOVX stretch timing (2–9 cycles), power-fail reset/interrupt, and watchdog timer - all while maintaining 80C32 software and pin compatibility in 44-pin TQFP packaging.
Technical Context
The DS80C320-FNG+ implements a redesigned 8051 core eliminating wasted clock and memory cycles, delivering 2.5× average instruction throughput versus standard 80C32 at identical crystal frequency. Its dual data pointer (DPTR0/DPTR1) enables single-instruction switching between source and destination addresses during block transfers.
Timing behavior is configurable: timers default to 12-clock-per-cycle mode for backward compatibility but can be reprogrammed to 4-clock mode via CKCON register bits; MOVX access speed is user-selectable (2–9 machine cycles) using CKCON.2–0, enabling seamless interfacing with both fast SRAM and slow peripherals like LCD controllers without glue logic.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Core Architecture | 80C32-compatible 8-bit CPU with 4-clock-per-machine-cycle execution (vs. 12 in legacy 80C32) |
| Max Clock Speed | 33MHz crystal input, enabling ~82.5MHz apparent instruction throughput |
| On-Chip RAM | 256 bytes scratchpad RAM - sufficient for stack and local variables without external dependency |
| Serial Interfaces | Two independent full-duplex UARTs: UART0 (P3.0/P3.1) and UART1 (P1.2/P1.3), each with dedicated SFRs |
| Timer/Counters | Three 16-bit timers/counters (T0, T1, T2), with T2 supporting capture/reload and baud rate generation |
| Interrupt Sources | 13 total interrupts including six external (INT0–INT5), two serial, three timer, and power-fail interrupt |
| Operating Voltage | 4.25V to 5.5V - compatible with legacy +5V systems and tolerant of supply droop |
| Package | 44-pin TQFP (7mm × 7mm, 0.8mm pitch) - surface-mount, thermally enhanced, RoHS-compliant |
Pinout & Package
DS80C320-FNG+ is housed in a 44-pin Thin Quad Flat Package (TQFP) with exposed thermal pad, rated for -40°C to +85°C operation. Pin functions are fully defined per Maxim's official pinout documentation for DS80C320/DS80C323.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC (Pin 16, 17) | Power Supply | +5V main supply; dual pins reduce IR drop and improve noise immunity in high-speed operation |
| GND (Pin 4) | Digital Ground | Reference return path for all digital I/O and core logic; separate from analog ground (not present) |
| RST (Pin 14) | Reset Input | Schmitt-triggered active-high input with internal pulldown; supports wired-OR reset sources without external RC network |
| XTAL1 (Pin 15), XTAL2 (Pin 14) | Crystal Oscillator Interface | Supports parallel-resonant AT-cut crystals up to 33MHz; XTAL1 accepts external clock input if crystal omitted |
| P0.0–P0.7 (Pins 33–38, 26, 27) | Multiplexed Address/Data Bus | Provides lower 8 bits of address during ALE high, then bidirectional data bus; requires external latch (e.g., 74LS373) for memory interface |
| P1.0–P1.7 (Pins 40–44, 1–3) | General-Purpose I/O with Alternate Functions | Includes T2/T2EX, RXD1/TXD1, and INT2–INT5 - enables expanded interrupt handling and second UART without port remapping |
| P2.0–P2.7 (Pins 18–25) | Upper Address Bus (A8–A15) | Outputs MSB address during external memory access; latched value used by MOVX @Ri instructions |
| P3.0–P3.7 (Pins 5–13) | Multifunction I/O Port | Provides UART0 (RXD0/TXD0), INT0/INT1, T0/T1, WR/RD - essential for standard 8051 peripheral interfacing |
| EA (Pin 29) | External Access Enable | Must be tied low to disable internal ROM and enable external program memory access - required for DS80C320 operation |
Key Features
| Feature | Design Value |
|---|---|
| Dual Data Pointer (DPTR0/DPTR1) | Reduces 64-byte memory block move from 1869 to 1097 machine cycles - saves 123.5μs at 25MHz |
| Programmable MOVX Stretch Timing | CKCON.2–0 selects 2–9 machine-cycle MOVX strobe width, enabling direct interface to 120ns–1120ns memory/peripherals |
| Power-Fail Detection & Reset | Integrated comparator triggers early-warning interrupt before reset, allowing safe state save and graceful shutdown |
| Programmable Watchdog Timer | Configurable timeout period prevents runaway code; reset or interrupt output selectable via WDCON register |
| Second Hardware UART (UART1) | Full-duplex serial port on P1.2/P1.3 with dedicated SCON1/SBUF1 registers - supports concurrent dual-protocol communication |
| Timer Compatibility Mode | Timers default to 12-clock-per-cycle on reset, preserving legacy baud rates and timing-critical code without modification |
Applications
| Industrial PLC I/O Module | Legacy Medical Instrument Upgrade |
|---|---|
Use Scenario: Compact programmable logic controller module controlling solenoids, relays, and analog sensors in factory automation cabinets. IC Role / Device Role / Timing Role: Primary system controller executing ladder logic scans, managing dual UARTs for Modbus RTU master/slave communication, and servicing 6 external interrupts from field inputs. Use Value: 33MHz operation ensures sub-millisecond scan times; dual DPTR accelerates sensor data buffering; power-fail interrupt enables nonvolatile parameter backup before brownout. | Use Scenario: Retrofit of aging ECG monitor firmware and hardware to meet updated IEC 60601-1 safety and timing requirements. IC Role / Device Role / Timing Role: Real-time signal acquisition controller interfacing ADCs, driving display, and communicating via isolated UART to host PC. Use Value: Backward-compatible 8051 code base reduces validation effort; programmable MOVX stretch allows reuse of existing 150ns SRAM; watchdog timer satisfies Class B self-test requirements. |
| Smart Energy Meter Communication Hub | Automotive Diagnostic Tool Interface |
Use Scenario: Two-way AMI (Advanced Metering Infrastructure) gateway aggregating data from multiple meters via RS-485 and reporting over GPRS. IC Role / Device Role / Timing Role: Dual-UART coordinator: UART0 handles RS-485 Modbus slave, UART1 manages AT-command GPRS modem interface. Use Value: Independent baud rate configuration per UART supports simultaneous 9600bps meter polling and 115200bps modem control; 44-pin TQFP fits space-constrained PCB layouts. | Use Scenario: Handheld OBD-II scanner translating J1850 PWM/VPW and CAN messages to USB for technician diagnostics. IC Role / Device Role / Timing Role: Protocol translation bridge with UART0 for USB-to-serial converter and UART1 for vehicle bus interface. Use Value: 256-byte RAM suffices for protocol buffers; power-fail reset ensures clean state recovery after vehicle ignition cycling; -40°C to +85°C rating matches under-hood temperature range. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 8-bit microcontroller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| DS80C323-ENL+ | Same core and peripherals, but 2.7V–5.5V operation and 18MHz max clock; lower power, reduced speed | Battery-powered portable instruments where voltage flexibility and power efficiency outweigh raw speed | Select DS80C323-ENL+ only when supply voltage may dip below 4.25V or when 18MHz suffices for timing budget |
| AT89C51RD2-RLTUM | 8051-compatible with 64kB Flash, 1.25kB RAM, but single UART and no dual DPTR or power-fail detection | Cost-sensitive consumer devices needing flash-based firmware updates but no industrial reliability features | Choose AT89C51RD2-RLTUM only when Flash memory and ISP capability are mandatory and dual UART/watchdog are unnecessary |
Compared with DS80C320-FNG+, DS80C323-ENL+ trades speed and voltage headroom for wider supply range and lower active current, while AT89C51RD2-RLTUM sacrifices integrated reliability features (power-fail, dual UART, dual DPTR) for on-chip Flash and simpler toolchain support - making DS80C320-FNG+ optimal for deterministic, upgrade-focused industrial designs.
Availability
DS80C320-FNG+ is available at Aetrix Electronics and suitable for industrial control systems, medical instrumentation, smart metering infrastructure, and automotive diagnostic tools requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for DS80C320-FNG+ 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-FNG+ belongs to Maxim's high-speed 8051-compatible microcontroller family, designed specifically to deliver deterministic real-time performance and seamless migration paths for legacy 80C32-based systems in harsh environments.
FAQ
What is the maximum crystal frequency supported by DS80C320-FNG+?
The DS80C320-FNG+ supports a maximum crystal frequency of 33MHz, enabling an apparent instruction execution rate of approximately 82.5MHz due to its 4-clock-per-machine-cycle architecture. This specification is confirmed in Maxim's official ordering information table and electrical characteristics section, and applies specifically to the DS80C320 variant - not the DS80C323.
Does DS80C320-FNG+ include on-chip program memory?
No, the DS80C320-FNG+ does not include on-chip ROM or Flash memory. It contains only 256 bytes of on-chip scratchpad RAM. Program code must be executed from external ROM or EPROM, accessed via the multiplexed P0 address/data bus and P2 upper address lines, with EA pin held low - consistent with the original 80C32 architecture.
How does the dual data pointer in DS80C320-FNG+ improve memory transfer performance?
The DS80C320-FNG+ implements two independent 16-bit data pointers (DPTR0 at 82h/83h, DPTR1 at 84h/85h) selectable via DPS bit at 86h. This eliminates the need to save/restore address registers during block moves: a 64-byte transfer executes in 1097 machine cycles instead of 1869, saving 123.5μs at 25MHz - a documented 41% reduction verified in Maxim's application example.
Can DS80C320-FNG+ operate with a 3.3V supply?
No, DS80C320-FNG+ requires a minimum supply voltage of 4.25V and is specified for 4.25V to 5.5V operation. For 3.3V compatibility, the pin-compatible DS80C323 variant (e.g., DS80C323-ENL+) should be selected, which supports 2.7V to 5.5V operation but with a reduced 18MHz maximum clock speed.
What is the function of the EA pin on DS80C320-FNG+ and how must it be connected?
The EA (External Access) pin on DS80C320-FNG+ is an active-low input that must be permanently tied to ground to enable external program memory access. Unlike some 8051 derivatives, DS80C320-FNG+ has no internal ROM; asserting EA low disables nonexistent on-chip code storage and routes all program fetches to external memory via P0 and P2 buses - a requirement explicitly stated in Maxim's datasheet pin description section.
DS80C320-FNG+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package/Case:
- 44-QFP
- Series:
- 80C
- Packaging:
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Core Processor:
- 8051
- Core Size:
- 8-Bit
- Speed:
- 25MHz
- Connectivity:
- EBI/EMI, SIO, UART/USART
- Peripherals:
- Power-Fail Reset, WDT
- Number of I/O:
- 32
- Program Memory Size:
- -
- Program Memory Type:
- ROMless
- EEPROM Size:
- -
- RAM Size:
- 256 x 8
- Voltage - Supply (Vcc/Vdd):
- 4.5V ~ 5.5V
- Data Converters:
- -
- Oscillator Type:
- External
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
DS80C320-FNG+ FAQ
1.How can I place an order for DS80C320-FNG+ through Aetrix?
Please submit a Request for Quotation (RFQ) for DS80C320-FNG+ on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for DS80C320-FNG+ reliable?
The price and inventory of DS80C320-FNG+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DS80C320-FNG+ is usually 5 days.
3.What payment methods are accepted for DS80C320-FNG+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DS80C320-FNG+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DS80C320-FNG+?
DS80C320-FNG+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DS80C320-FNG+ order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for DS80C320-FNG+?
For technical support, including DS80C320-FNG+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DS80C320-FNG+ requirements.
6.How does Aetrix verify that DS80C320-FNG+ is sourced from the original manufacturer or authorized distributors?
All DS80C320-FNG+ products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that DS80C320-FNG+ meets industry standards.
7.What is the process for return or replacement of DS80C320-FNG+?
All DS80C320-FNG+ units undergo pre-shipment inspection (PSI). If there is an issue with DS80C320-FNG+, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The DS80C320-FNG+ part is unused and in its original packaging.
Return procedure for DS80C320-FNG+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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