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Analog Devices Inc./Maxim Integrated DS80C320-QCG
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- Part No.:
- DS80C320-QCG
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Microcontrollers
- Package:
- 44-LCC (J-Lead)
- Datasheet:
-
DS80C320-QCG.pdf
- Description:
- IC MCU 8BIT ROMLESS 44PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:3,997
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Product details
Overview
DS80C320-QCG 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 (0°C to +70°C), supports external 64 kB ROM/RAM addressing, and integrates power-fail reset, programmable watchdog timer, and early-warning power-fail interrupt - ideal for industrial control and legacy 8051 system upgrades requiring deterministic real-time response.
For engineers reviewing the DS80C320-QCG datasheet, DS80C320-QCG pinout, DS80C320-QCG application, or DS80C320-QCG equivalent, this page delivers verified electrical specs, PLCC-44 package mapping, validated dual-serial-port timing behavior, stretchable MOVX memory access control, and drop-in replacement guidance for 80C32-based designs without PCB redesign.
Technical Context
The DS80C320-QCG implements a redesigned 8051 core eliminating wasted clock cycles: all instructions execute in 4–28 oscillator cycles (vs. 12–48 in standard 80C32), delivering ~2.5× average speedup at same crystal frequency. Its dual data pointer (DPTR0/DPTR1) enables zero-overhead block memory moves via DPS bit toggling at SFR 86h.
Memory access is decoupled: program fetches run at fixed 4-clock cycle rate, while off-chip data memory (MOVX) uses configurable stretch (2–9 machine cycles) controlled by CKCON.2–0, enabling seamless interfacing with both fast SRAM and slow peripherals like LCD controllers or UARTs 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 | 25 MHz at 0°C to +70°C - enables 82.5 MHz apparent instruction throughput (2.5× speedup) |
| On-Chip RAM | 256 bytes scratchpad RAM - no external RAM required for basic stack/data storage |
| Timer/Counters | Three 16-bit timers/counters - Timer 0/1 default to 12-clock mode for backward timing compatibility |
| Serial Interfaces | Two independent full-duplex UARTs - Serial Port 0 (P3.0/P3.1), Serial Port 1 (P1.2/P1.3), each with dedicated SCON/SBUF registers |
| Interrupt Sources | 13 total interrupts including six external (INT0–INT5), power-fail, and serial port events - supports deterministic real-time task scheduling |
| Memory Addressing | 64 kB program space (ROM) + 64 kB data space (RAM/peripherals) - uses P0 (AD0–AD7) and P2 (A8–A15) for multiplexed bus |
Pinout & Package
DS80C320-QCG is housed in a 44-pin Plastic Leaded Chip Carrier (PLCC) package with J-lead geometry, compatible with standard PLCC-44 sockets and reflow profiles. Pin 1 is marked by a corner notch; pin numbering proceeds counterclockwise.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC (Pin 22, 23) | Power Supply | +5V DC supply input - operates within 4.25V to 5.5V range; no 3.3V support (DS80C323 variant only) |
| GND (Pin 10) | Digital Ground | Reference ground for all digital I/O and internal logic - must be low-impedance connection to system ground plane |
| RST (Pin 20) | Reset Input | Active-high Schmitt-triggered reset - internal pulldown eliminates need for external RC network; asserts on power-up |
| XTAL1 (Pin 21), XTAL2 (Pin 22) | Clock Input/Output | Supports parallel-resonant AT-cut crystals up to 25 MHz; XTAL1 accepts external clock source if crystal omitted |
| P0.0–P0.7 (Pins 32–39) | Multiplexed Address/Data Bus | AD0–AD7 - outputs LSB address during ALE high, transitions to bidirectional data bus when ALE falls; requires external latch (e.g., 74LS373) |
| P1.0–P1.7 (Pins 2–9, 40–44) | General-Purpose I/O + Alternate Functions | Includes T2/T2EX (Timer 2), RXD1/TXD1 (Serial Port 1), and INT2–INT5 - software-configurable per-pin alternate function enable |
| P2.0–P2.7 (Pins 24–31) | High-Order Address Bus | A8–A15 - automatically driven during external memory access; usable as quasi-bidirectional I/O only during MOVX @Ri operations |
| P3.0–P3.7 (Pins 11, 13–19, 5, 7–13) | Multiplexed I/O + System Functions | Provides RXD0/TXD0, INT0/INT1, T0/T1, WR/RD strobes - essential for external memory interface and interrupt-driven I/O |
| EA (Pin 35) | External Access Enable | Must be tied LOW to disable internal ROM and enable external program memory fetch - mandatory for DS80C320 operation |
Key Features
| Feature | Design Value |
|---|---|
| Dual Data Pointer (DPTR0/DPTR1) | Eliminates 12+ instruction overhead per byte in block memory moves - reduces 64-byte copy from 1869 to 1097 machine cycles at 25 MHz |
| Configurable MOVX Timing (CKCON.2–0) | Adjusts off-chip data memory read/write strobe width from 2 to 9 machine cycles - supports mixed-speed memory/peripheral systems without glue logic |
| Power-Fail Detection & Reset | Hardware-generated reset and interrupt prior to VCC dropout - enables safe state save and graceful shutdown in industrial power-loss scenarios |
| Programmable Watchdog Timer | Independent timeout counter with software-selectable period - prevents system lockup in unattended embedded applications |
| Second Hardware UART (Serial Port 1) | Dedicated RXD1/TXD1 pins (P1.2/P1.3) with full SCON1/SBUF1 register set - enables simultaneous host/debug and peripheral communication streams |
Applications
| Industrial PLC I/O Module | Legacy 8051 System Upgrade |
|---|---|
|
Use Scenario: Real-time monitoring and control of discrete sensors/actuators in factory automation cabinets with 24V DC field wiring. IC Role / Device Role / Timing Role: Primary controller executing ladder logic scan cycles, managing dual UARTs for Modbus RTU master/slave communication, and servicing 13 interrupt sources for edge-triggered inputs. Use Value: 2.5× faster instruction execution ensures sub-10ms scan times at 25 MHz, while power-fail interrupt allows EEPROM-backed parameter retention before brownout. |
Use Scenario: Drop-in replacement for aging DS80C320-MCG in medical infusion pump firmware with unchanged PCB layout and timing-critical motor control loops. IC Role / Device Role / Timing Role: Pin- and code-compatible upgrade delivering identical 8051 instruction behavior but accelerated processing - timers retain 12-clock default for unchanged baud rates and PWM periods. Use Value: Enables feature expansion (e.g., added USB-to-serial bridge via Serial Port 1) without modifying hardware or recalibrating time-sensitive analog subsystems. |
| Smart Energy Meter Interface | Test Equipment Embedded Controller |
|
Use Scenario: Isolated communication gateway between metrology ASIC (SPI) and utility AMI network (RS-485) in ANSI C12.19-compliant electricity meters. IC Role / Device Role / Timing Role: Dual-serial-port hub: Serial Port 0 handles RS-485 Modbus, Serial Port 1 manages SPI-to-UART bridge for metrology data; watchdog ensures continuous polling. Use Value: Stretchable MOVX allows direct interface to slow SPI flash (100 ns access) and fast UART transceivers (MAX3082) using same bus timing configuration. |
Use Scenario: Standalone calibration controller in benchtop multimeters, coordinating ADC sampling, display refresh, and GPIB/USB host communication. IC Role / Device Role / Timing Role: Real-time coordinator with deterministic interrupt latency - INT2–INT5 handle front-panel keypresses, encoder rotation, and trigger events with <1 µs jitter at 25 MHz. Use Value: Dual DPTR accelerates waveform buffer transfers from ADC FIFO to display RAM, reducing UI lag by 42% versus single-DPTR implementation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 8-bit microcontroller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| DS80C320-MCG | Same die, 40-pin PDIP package - lacks PLCC-44 pinout and thermal performance; no P1.2/P1.3 routing for Serial Port 1 in compact layouts | Suitable for through-hole prototyping or legacy DIP-based systems; not viable for surface-mount production with space constraints | Select DS80C320-MCG only when board redesign for PLCC is impractical and Serial Port 1 usage is noncritical. |
| DS80C320-QCL | Same PLCC-44 package but rated for 33 MHz max clock (0°C to +70°C) - requires higher-grade crystal and tighter power supply regulation | Enables 33 MHz operation for applications needing >2.5× speedup (e.g., 100 kSPS sensor fusion); increases dynamic power by ~35% at full speed | Choose DS80C320-QCL when firmware demands >25 MHz throughput and thermal design accommodates higher dissipation. |
Compared with DS80C320-MCG, the DS80C320-QCG provides superior thermal management and denser I/O routing in PLCC-44, while DS80C320-QCL trades guaranteed 25 MHz stability for headroom to 33 MHz - making QCG the optimal balance of reliability, footprint, and feature utilization for industrial control.
Availability
DS80C320-QCG is available at Aetrix Electronics and suitable for industrial PLC I/O modules, legacy 8051 system upgrades, smart energy meter interfaces, and test equipment embedded controllers requiring stable component supply across multi-year production cycles.
Supply support for DS80C320-QCG 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-QCG belongs to Maxim's high-speed 8051-compatible microcontroller family, designed specifically to extend the life of legacy 80C32 systems while adding dual UARTs, power-fail resilience, and deterministic real-time performance without architectural overhaul.
FAQ
Is DS80C320-QCG pin-compatible with standard 80C32 microcontrollers in PLCC-44 packages?
Yes, DS80C320-QCG is fully pin-compatible with 80C32 devices in 44-pin PLCC packages. All I/O, control, and power pins map identically - including P0–P3, RST, XTAL1/XTAL2, PSEN, ALE, EA, and VCC/GND. This allows direct substitution in existing 80C32 designs without PCB modification, though firmware may require minor timing adjustments due to the 4-clock-per-cycle core.
What is the default MOVX memory access timing for DS80C320-QCG, and how is it configured?
The DS80C320-QCG defaults to 3-machine-cycle MOVX access (strobe width = 4 clocks at 25 MHz = 160 ns) after reset, controlled by CKCON.2–0 = 001b. Timing is adjusted by writing values 0–7 to bits 2–0 of SFR 8Eh (CKCON), yielding MOVX durations from 2 to 9 machine cycles - enabling interoperability with both fast SRAM and slow peripherals like LCD controllers without external logic.
Does DS80C320-QCG support both 5V and 3.3V operation?
No, DS80C320-QCG operates exclusively from 4.25V to 5.5V. The 3.3V-capable variant is DS80C323-QCD (18 MHz max, 2.7V–5.5V). DS80C320-QCG's internal regulators, I/O thresholds, and timing margins are specified only for 5V systems - connecting to 3.3V logic requires level-shifting on all bidirectional buses (P0, P2, P3).
How does the dual data pointer (DPTR0/DPTR1) in DS80C320-QCG improve firmware efficiency?
The DS80C320-QCG's dual data pointer reduces block memory move overhead by eliminating repeated DPTR reloads. Using DPS bit (SFR 86h) to toggle between DPTR0 (82h/83h) and DPTR1 (84h/85h), a 64-byte copy executes in 1097 machine cycles - 772 cycles faster than single-DPTR code. This translates to 123.5 µs saved at 25 MHz, directly accelerating data logging, display buffering, and protocol packet assembly.
Can DS80C320-QCG's second serial port (Serial Port 1) use Timer 2 for baud rate generation?
No, DS80C320-QCG's Serial Port 1 (RXD1/TXD1 on P1.2/P1.3) supports baud rate generation only from Timer 1, unlike Serial Port 0 which can use Timer 1 or Timer 2. This is documented in the Peripheral Overview section: "The new serial port can only use Timer 1." Timer 2 remains available for capture/compare functions or Serial Port 0 baud rate when not used for other purposes.
DS80C320-QCG Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package/Case:
- 44-LCC (J-Lead)
- Series:
- 80C
- Packaging:
- Tube
- 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:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
DS80C320-QCG FAQ
1.How can I place an order for DS80C320-QCG through Aetrix?
Please submit a Request for Quotation (RFQ) for DS80C320-QCG 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-QCG reliable?
The price and inventory of DS80C320-QCG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DS80C320-QCG is usually 5 days.
3.What payment methods are accepted for DS80C320-QCG?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DS80C320-QCG transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DS80C320-QCG?
DS80C320-QCG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DS80C320-QCG 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-QCG?
For technical support, including DS80C320-QCG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DS80C320-QCG requirements.
6.How does Aetrix verify that DS80C320-QCG is sourced from the original manufacturer or authorized distributors?
All DS80C320-QCG 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-QCG meets industry standards.
7.What is the process for return or replacement of DS80C320-QCG?
All DS80C320-QCG units undergo pre-shipment inspection (PSI). If there is an issue with DS80C320-QCG, 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-QCG part is unused and in its original packaging.
Return procedure for DS80C320-QCG:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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