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Analog Devices Inc./Maxim Integrated DS80C323-QCD/T&R
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- Part No.:
- DS80C323-QCD/T&R
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Microcontrollers
- Package:
- 44-LCC (J-Lead)
- Datasheet:
-
DS80C323-QCD/T&R.pdf
- Description:
- IC MCU 8BIT ROMLESS 44PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:2,436
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Product details
Overview
DS80C323-QCD/T&R from Maxim Integrated is a high-speed, low-voltage 80C32-compatible 8-bit microcontroller featuring 4-clock-per-machine-cycle architecture, 18MHz max crystal frequency, 256 bytes on-chip RAM, dual hardware serial ports, and programmable watchdog timer. It operates from 2.7V to 5.5V and is designed for embedded control in power-sensitive industrial and instrumentation systems requiring 8051 software compatibility with accelerated execution.
For engineers reviewing the DS80C323-QCD/T&R datasheet, DS80C323-QCD/T&R pinout, DS80C323-QCD/T&R application, or DS80C323-QCD/T&R equivalent, key selection considerations include its 2.7–5.5V supply range, PLCC-44 package, 18MHz clock limit, dual DPTR support for efficient memory moves, and configurable MOVX stretch timing for mixed-speed peripheral interfacing.
Technical Context
The DS80C323-QCD/T&R implements a redesigned 8051 core executing most instructions in 4 oscillator cycles (vs. 12 in legacy 80C32), delivering ~2.5× average speedup without code changes. Its dual data pointers (DPTR0 at 82h/83h, DPTR1 at 84h/85h) and DPS bit (86h) enable zero-overhead switching 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 timers/counters with selectable 4- or 12-clock timing modes via CKCON register (8Eh), power-fail reset and interrupt, and early-warning power-fail detection - all accessible through non-overlapping SFRs distinct from standard 80C32 mappings.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Core Architecture | 80C32-compatible 8-bit CPU with 4-clock machine cycle; enables drop-in replacement with 2.5× average instruction throughput vs. legacy 80C32. |
| Max Clock Frequency | 18MHz crystal input; supports real-time operation up to 4.5MIPS at 18MHz with 4-cycle execution. |
| Supply Voltage Range | 2.7V to 5.5V; allows direct integration into battery-powered or mixed-voltage industrial systems without level-shifting. |
| On-Chip RAM | 256 bytes scratchpad RAM; sufficient for stack and local variables in compact embedded firmware without external SRAM dependency. |
| Memory Addressing | 64kB program space (ROM/Flash) + 64kB data space (RAM/peripherals); uses P0 (AD0–AD7) and P2 (A8–A15) for external bus interface. |
| Serial Interfaces | Two independent full-duplex UARTs; Serial Port 0 (P3.0/P3.1) and Serial Port 1 (P1.2/P1.3) support concurrent asynchronous communication at different baud rates. |
| Timer/Counter Resources | Three 16-bit timers/counters (T0, T1, T2); each configurable for 4- or 12-clock timing via CKCON bits to maintain legacy timing or enable higher-resolution timing. |
| Interrupt Sources | 13 total interrupts including six external (INT0–INT5), serial port flags, timer overflows, and power-fail event; supports deterministic real-time response in multi-tasking firmware. |
Pinout & Package
DS80C323-QCD/T&R is housed in a 44-pin Plastic Leaded Chip Carrier (PLCC) package with J-lead geometry, rated for 0°C to +70°C ambient operation and RoHS-compliant (QCD+ suffix). The package provides robust thermal performance and reliable socketing for prototyping and production.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC (Pin 22, 23) | Power supply input | Accepts 2.7V–5.5V; powers core logic and I/O; dual pins reduce IR drop and improve noise immunity. |
| GND (Pin 10) | Digital ground reference | Primary return path for digital circuitry; must be connected to system ground plane with low-inductance trace. |
| RST (Pin 20) | Active-high reset input | Schmitt-triggered input with internal pulldown; accepts external RC or pushbutton reset; no external capacitor required for power-on reset. |
| XTAL1 (Pin 21), XTAL2 (Pin 22) | Clock oscillator interface | Supports parallel-resonant AT-cut crystals up to 18MHz; XTAL1 also accepts external clock source. |
| P0.0–P0.7 (Pins 32–39) | Multiplexed address/data bus (AD0–AD7) | Drives LSB of external address during ALE high; transitions to bidirectional data bus when ALE falls; requires no external pullups. |
| P1.0–P1.7 (Pins 2–9, 40–44) | General-purpose I/O with alternate functions | Supports Timer 2 I/O (P1.0/P1.1), Serial Port 1 (P1.2/P1.3), and five external interrupts (P1.4–P1.7); weak pullup on reset enables input mode. |
| P2.0–P2.7 (Pins 24–31) | High-order address bus (A8–A15) | Outputs MSB of external memory address during MOVX/MOVC; value latched internally for indirect addressing. |
| P3.0–P3.7 (Pins 11, 13–19) | Multiplexed I/O with system functions | Provides Serial Port 0 (P3.0/P3.1), INT0/INT1 (P3.2/P3.3), Timer inputs (P3.4/P3.5), and RD/WR strobes (P3.6/P3.7). |
| EA (Pin 35) | External access enable | Must be tied low to disable on-chip ROM and enable external program memory fetches exclusively. |
Key Features
| Feature | Design Value |
|---|---|
| Dual Data Pointer (DPTR0/DPTR1) | Reduces 64-byte memory block move cycles from 1869 to 1097 at 25MHz - cuts execution time by 41% and eliminates address save/restore overhead. |
| Configurable MOVX Timing (CKCON.2–0) | Allows runtime adjustment of external data memory read/write strobe width from 2 to 9 machine cycles (80ns–1120ns at 25MHz), enabling glueless interface to slow peripherals like LCDs or legacy RAM. |
| Power-Fail Detection & Reset | Generates early-warning interrupt before brownout and automatic hardware reset below VCC threshold - prevents corrupted state in battery-backed or unregulated supplies. |
| Programmable Watchdog Timer | Independent timeout counter with software-controlled enable/disable and reset trigger; prevents firmware lockup in无人值守 industrial controllers. |
| Second Hardware UART (Serial Port 1) | Full-duplex UART on P1.2/P1.3 with dedicated SCON1/SBUF1 registers; enables simultaneous host debug and fieldbus communication without software bit-banging. |
| 13-Source Interrupt Controller | Supports nested priority handling of six external interrupts (INT0–INT5), two serial flags, three timer overflows, and power-fail event - ensures deterministic latency for time-critical tasks. |
Applications
| Industrial PLC I/O Module | Portable Test Instrumentation |
|---|---|
|
Use Scenario: Compact programmable logic controller module monitoring analog/digital sensors and driving relays in factory automation cabinets. IC Role / Device Role / Timing Role: Primary controller executing ladder logic scan, managing RS-485 Modbus RTU (Serial Port 0) and isolated CAN gateway UART (Serial Port 1), and servicing real-time I/O interrupts. Use Value: 2.7–5.5V operation tolerates wide input rail fluctuations; dual UARTs eliminate need for external bridge ICs; power-fail reset preserves last known safe state during line dips. |
Use Scenario: Handheld multimeter or oscilloscope with LCD display, keypad, and USB-to-serial bridge for PC connectivity. IC Role / Device Role / Timing Role: System manager coordinating measurement acquisition, LCD refresh, button polling, and serial data streaming via UART to host PC. Use Value: Low-voltage operation extends battery life; MOVX stretch timing accommodates slow LCD controller writes without added wait-state logic; dual DPTR accelerates waveform buffer transfers. |
| Smart Energy Meter Interface | Legacy Equipment Retrofit Controller |
|
Use Scenario: DIN-rail mounted electricity meter communicating via optical port (Serial Port 0) and RF mesh network (Serial Port 1) while logging tamper events. IC Role / Device Role / Timing Role: Secure data concentrator handling DLMS/COSEM protocol stacks, cryptographic timestamping, and secure flash updates. Use Value: Programmable watchdog ensures recovery from communication hangs; power-fail interrupt triggers immediate nonvolatile storage of critical metering data before shutdown. |
Use Scenario: Drop-in upgrade replacing obsolete 80C32 in legacy HVAC control panels to extend product lifecycle without PCB redesign. IC Role / Device Role / Timing Role: Pin- and code-compatible replacement running existing firmware at 2.5× speed, freeing CPU cycles for added diagnostics and remote monitoring features. Use Value: 44-pin PLCC matches original footprint; identical SFR map preserves register-level drivers; timer default to 12-clock mode maintains legacy baud rates and PWM timing. |
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-QCL+ | Same architecture and pinout, but rated for 33MHz max clock and 4.25–5.5V supply only; lacks 2.7V low-voltage operation. | Better suited for high-speed 5V-only systems where extended voltage range is unnecessary. | Select DS80C320-QCL+ only if design requires >18MHz operation and operates strictly within 4.25–5.5V. |
| AT89C51RD2-RL | Enhanced 8051 with 64kB Flash, 1.25kB RAM, and ISP capability; operates at 5V only; no dual UART or MOVX stretch feature. | Preferred for new designs needing in-system programming and larger on-chip memory, but requires firmware adaptation for peripheral access. | Choose AT89C51RD2-RL for cost-sensitive new designs with Flash-based firmware updates; avoid for drop-in 80C32 replacements requiring dual UART or low-voltage operation. |
Compared with DS80C320-QCL+, DS80C323-QCD/T&R trades maximum clock speed for wider supply range and lower power - making it optimal for battery or wide-input industrial rails. Against AT89C51RD2-RL, DS80C323-QCD/T&R offers superior peripheral integration (dual UART, power-fail logic) and true pin/software compatibility with legacy 80C32 designs, albeit without Flash memory.
Availability
DS80C323-QCD/T&R is available at Aetrix Electronics and suitable for industrial PLC modules, portable test instrumentation, smart energy meter interfaces, and legacy equipment retrofit requiring stable component supply across extended temperature and voltage ranges.
Supply support for DS80C323-QCD/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 DS80C323-QCD/T&R belongs to Maxim's high-speed 8051-compatible microcontroller family, engineered to deliver 2.5× performance uplift while maintaining full software and pin compatibility with legacy 80C32 systems in power-constrained environments.
FAQ
What is the operating voltage range of the DS80C323-QCD/T&R?
The DS80C323-QCD/T&R operates from 2.7V to 5.5V, enabling direct use in battery-powered devices, wide-input industrial supplies, and mixed-voltage systems without external regulators or level shifters. This range is confirmed in the Maxim datasheet ordering table and electrical specifications section, distinguishing it from the 4.25–5.5V-only DS80C320 variants.
Is the DS80C323-QCD/T&R pin-compatible with standard 80C32 microcontrollers?
Yes, the DS80C323-QCD/T&R is fully pin-compatible with the 80C32 in the 44-pin PLCC package, sharing identical pin functions for P0–P3, RST, XTAL1/XTAL2, EA, PSEN, and ALE. This allows direct replacement in existing designs, though firmware may require minor timing adjustments due to its 4-clock-per-cycle core.
Does the DS80C323-QCD/T&R include on-chip program memory?
No, the DS80C323-QCD/T&R does not contain on-chip ROM or Flash memory. It relies on external program memory accessed via the multiplexed P0 bus and P2 address lines, consistent with the 80C32 architecture. It does include 256 bytes of on-chip scratchpad RAM for data storage and stack operations.
How does the dual data pointer (DPTR) in DS80C323-QCD/T&R improve firmware efficiency?
The DS80C323-QCD/T&R implements two independent 16-bit data pointers (DPTR0 at 82h/83h, DPTR1 at 84h/85h) selected via the DPS bit (86h). This eliminates the need to save and restore addresses during memory block moves - reducing a 64-byte transfer from 1869 to 1097 machine cycles at 25MHz, a 41% execution time reduction confirmed in the datasheet's sample code comparison.
Can the DS80C323-QCD/T&R interface with slow peripherals like LCD controllers?
Yes, the DS80C323-QCD/T&R supports configurable MOVX timing via the CKCON register (bits 2–0), allowing the external data memory read/write strobe width to be stretched from 2 to 9 machine cycles (e.g., 80ns to 1120ns at 25MHz). This enables glueless interfacing with slow peripherals such as character LCDs or legacy parallel EEPROMs without external wait-state logic.
What is the function of the EA pin on the DS80C323-QCD/T&R?
The EA (External Access) pin on the DS80C323-QCD/T&R must be tied low (ground) to disable any internal program memory and force all program fetches to external ROM or Flash. Since the DS80C323-QCD/T&R has no on-chip program memory, EA is always connected to GND - a requirement explicitly stated in the "PIN DESCRIPTION" section of the Maxim datasheet.
DS80C323-QCD/T&R Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package/Case:
- 44-LCC (J-Lead)
- Series:
- 80C
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Core Processor:
- 8051
- Core Size:
- 8-Bit
- Speed:
- 18MHz
- 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):
- 2.7V ~ 5.5V
- Data Converters:
- -
- Oscillator Type:
- External
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
DS80C323-QCD/T&R FAQ
1.How can I place an order for DS80C323-QCD/T&R through Aetrix?
Please submit a Request for Quotation (RFQ) for DS80C323-QCD/T&R 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 DS80C323-QCD/T&R reliable?
The price and inventory of DS80C323-QCD/T&R are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DS80C323-QCD/T&R is usually 5 days.
3.What payment methods are accepted for DS80C323-QCD/T&R?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DS80C323-QCD/T&R transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DS80C323-QCD/T&R?
DS80C323-QCD/T&R orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DS80C323-QCD/T&R 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 DS80C323-QCD/T&R?
For technical support, including DS80C323-QCD/T&R datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DS80C323-QCD/T&R requirements.
6.How does Aetrix verify that DS80C323-QCD/T&R is sourced from the original manufacturer or authorized distributors?
All DS80C323-QCD/T&R 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 DS80C323-QCD/T&R meets industry standards.
7.What is the process for return or replacement of DS80C323-QCD/T&R?
All DS80C323-QCD/T&R units undergo pre-shipment inspection (PSI). If there is an issue with DS80C323-QCD/T&R, 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 DS80C323-QCD/T&R part is unused and in its original packaging.
Return procedure for DS80C323-QCD/T&R:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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