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Analog Devices Inc./Maxim Integrated DS80C323-ECD
- Part No.:
- DS80C323-ECD
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Microcontrollers
- Package:
- 44-TQFP
- Datasheet:
-
DS80C323-ECD.pdf
- Description:
- IC MCU 8BIT ROMLESS 44TQFP
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
DS80C323-ECD from Maxim Integrated is a high-speed, low-voltage 80C32-compatible 8-bit microcontroller featuring 4-clock-per-machine-cycle architecture, 256 bytes of on-chip RAM, dual hardware serial ports, and programmable watchdog timer. It operates from 2.7V to 5.5V and supports up to 18MHz crystal frequency, enabling real-time control in battery-powered industrial sensors and legacy 8051-based upgrade systems.
For engineers reviewing the DS80C323-ECD datasheet, DS80C323-ECD pinout, DS80C323-ECD application, or DS80C323-ECD equivalent, key selection considerations include its 4-clock core timing, dual DPTR support for efficient memory moves, variable MOVX stretch control, 2.7–5.5V operation, and TQFP-44 package compatibility with existing 80C32 layouts.
Technical Context
The DS80C323-ECD implements a redesigned 8051 core executing most instructions in 4 oscillator cycles-three times faster than standard 80C32 at identical clock frequency-while retaining full 8051 instruction set and SFR mapping. Its dual data pointer (DPTR0/DPTR1) and configurable MOVX access timing (2–9 machine cycles) enable optimized interfacing with mixed-speed peripherals and memory.
It integrates power-fail reset, early-warning power-fail interrupt, and programmable watchdog timer-all accessible via dedicated SFRs-while maintaining pin compatibility with 80C32 in 44-pin TQFP. Timer/counter behavior defaults to 12-clock mode on reset for backward timing compatibility but can be reconfigured to 4-clock mode via CKCON register bits.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Core Architecture | 8051-compatible, 4-clock-per-machine-cycle execution (vs. 12-clock in legacy 80C32) |
| Max Clock Frequency | 18MHz crystal input - enables 4.5MIPS throughput at 18MHz |
| Supply Voltage Range | 2.7V to 5.5V - supports direct replacement in 3.3V and 5V systems without level-shifting |
| On-Chip RAM | 256 bytes scratchpad RAM - sufficient for stack and local variables without external SRAM |
| Serial Interfaces | Two independent full-duplex UARTs - one on P3.0/P3.1, second on P1.2/P1.3 |
| Timer/Counters | Three 16-bit timers/counters - Timer 2 supports capture/reload; all default to 12-clock mode on reset |
| Memory Addressing | 64kB program space + 64kB data space - uses multiplexed P0 + P2 addressing with ALE strobe |
| Package | 44-pin TQFP (7mm × 7mm, 0.8mm pitch) - RoHS-compliant, surface-mount, thermal performance suitable for industrial ambient |
Pinout & Package
DS80C323-ECD is housed in a 44-pin Thin Quad Flat Package (TQFP) with 0.8mm lead pitch and exposed thermal pad. Pin numbering follows standard TQFP top-view orientation (pin 1 marked by dot or notch).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC (Pin 16, 17) | Power Supply | Primary supply input: accepts 2.7V–5.5V; dual pins reduce IR drop and improve noise immunity |
| GND (Pin 4) | Digital Ground | Reference return path for digital logic; separate from analog ground (not present) |
| RST (Pin 14) | Reset Input | Schmitt-triggered active-high input with internal pulldown; no external RC required for power-on reset |
| XTAL1 (Pin 15), XTAL2 (Pin 14) | Clock Input/Output | Supports parallel-resonant AT-cut crystals up to 18MHz; XTAL1 accepts external clock source |
| P0.0–P0.7 (Pins 38–32) | Multiplexed Address/Data Bus | AD0–AD7: latched by ALE; no internal latch - requires external 74LS373 or equivalent for bus demux |
| P1.0–P1.7 (Pins 40–3, 1, 2) | General-Purpose I/O + Alternate Functions | Includes T2/T2EX, RXD1/TXD1, and INT2–INT5 - enables expanded interrupt handling and second UART |
| P2.0–P2.7 (Pins 18–25) | High-Order Address Bus | A8–A15: automatically driven during external memory access; usable as GPIO only when not accessing off-chip memory |
| P3.0–P3.7 (Pins 5, 7–13) | General-Purpose I/O + Standard Peripherals | Provides RXD0/TXD0, INT0/INT1, T0/T1, WR/RD - maintains full 80C32 peripheral pinout compatibility |
| EA (Pin 29) | External Access Enable | Must be tied LOW to disable internal ROM (none present) and enable external program memory access |
| N.C. (Pins 6, 28, 39) | No Connection | Reserved for future family expansion; must remain unconnected per datasheet specification |
Key Features
| Feature | Design Value |
|---|---|
| Dual Data Pointer (DPTR0/DPTR1) | Reduces 64-byte block memory move cycles from 1869 to 1097 at 25MHz - eliminates address save/restore overhead |
| Configurable MOVX Timing (CKCON) | Adjusts external data memory read/write strobe width from 2 to 9 machine cycles - supports 80ns–1120ns peripheral response |
| Power-Fail Detection & Reset | Generates early-warning interrupt before brownout and hard reset - enables safe state save and graceful shutdown |
| Programmable Watchdog Timer | Independent timeout control with software-reset capability - prevents runaway code in unattended embedded systems |
| Second Hardware UART (Serial Port 1) | Full-duplex interface on P1.2/P1.3 with dedicated SCON1/SBUF1 registers - enables simultaneous host/debug and sensor comms |
| Backward-Compatible Timer Operation | Timers default to 12-clock mode on reset - preserves baud rate and timing-critical legacy firmware without modification |
Applications
| Industrial Sensor Node | Legacy 8051 System Upgrade |
|---|---|
|
Use Scenario: Battery-powered temperature/humidity sensor node with RS-485 Modbus communication and local data logging. IC Role / Device Role / Timing Role: Main controller managing ADC sampling, dual UART (Modbus RTU + debug console), and EEPROM write sequencing. Use Value: 2.7V operation extends battery life; dual DPTR accelerates EEPROM block writes; power-fail interrupt ensures log integrity during voltage sag. |
Use Scenario: Retrofit of aging 80C32-based HVAC controller board requiring higher throughput without PCB redesign. IC Role / Device Role / Timing Role: Drop-in replacement executing same firmware at 2.5× speed while preserving all I/O pin assignments and memory map. Use Value: 4-clock core delivers measurable latency reduction in PID loop execution; 12-clock timer default maintains original fan speed and valve timing accuracy. |
| Medical Diagnostic Handheld | Smart Energy Meter Interface |
|
Use Scenario: Portable blood glucose meter with LCD display, button interface, and Bluetooth LE module via UART. IC Role / Device Role / Timing Role: System-on-chip managing sensor signal conditioning, display refresh, and asynchronous BLE packet framing. Use Value: Dual UART allows concurrent LCD controller command stream and BLE data transmission; low-voltage operation meets IEC 62366 usability requirements. |
Use Scenario: Two-way communication interface between metrology ASIC and PLC via RS-485, with tamper detection and secure firmware update. IC Role / Device Role / Timing Role: Secure bootloader and protocol translator handling DLMS/COSEM over serial, with watchdog-enforced fail-safe state. Use Value: Programmable watchdog prevents persistent lockup during OTA updates; power-fail reset safeguards meter calibration constants during grid instability. |
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-ECL | Same pinout and feature set, but rated for 33MHz max clock and 4.25–5.5V operation - no 2.7V support | Requires 5V-only supply; unsuitable for battery-powered or mixed-voltage designs | Select DS80C320-ECL only when higher clock speed (≥25MHz) and strict 5V operation are required |
| AT89C51RD2-RL | 8051-compatible with 64kB Flash, 1.25kB RAM, and ISP capability - lacks dual UART, power-fail detection, and dual DPTR | Offers in-system programming but no hardware features for robust industrial monitoring | Choose AT89C51RD2-RL when field firmware updates are critical and external peripherals handle power monitoring |
Compared with DS80C323-ECD, DS80C320-ECL trades low-voltage flexibility for higher speed and tighter voltage tolerance, while AT89C51RD2-RL sacrifices integrated fault-protection features for flash-based reprogrammability - making DS80C323-ECD optimal for safety-aware, battery-constrained, or legacy-interop designs.
Availability
DS80C323-ECD is available at Aetrix Electronics and suitable for industrial sensor nodes, legacy 8051 system upgrades, medical handhelds, smart energy meter interfaces, and battery-powered control modules requiring stable component supply across extended product lifecycles.
Supply support for DS80C323-ECD 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 automotive applications.
The DS80C323-ECD belongs to Maxim's high-speed 8051-compatible microcontroller family, designed specifically to deliver deterministic real-time performance, robust power management, and seamless migration paths for legacy 80C32-based systems.
FAQ
What is the maximum operating frequency of the DS80C323-ECD?
The DS80C323-ECD supports a maximum crystal frequency of 18MHz, delivering up to 4.5 million instructions per second (MIPS) due to its 4-clock-per-instruction-cycle architecture. This is confirmed in the Ordering Information table and Electrical Characteristics section of the official Maxim datasheet. The DS80C323-ECD does not support frequencies above 18MHz - attempting to exceed this limit may cause timing violations or functional failure.
Does the DS80C323-ECD include on-chip program memory?
No, the DS80C323-ECD 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 high-order address lines. The EA pin must be tied LOW to enable external code fetch, as stated in the PIN DESCRIPTION section. This matches the 80C32 architecture and distinguishes DS80C323-ECD from flash-based 8051 derivatives like the AT89 series.
How does the dual data pointer (DPTR) function in the DS80C323-ECD?
The DS80C323-ECD implements two independent 16-bit data pointers: DPTR0 (SFR addresses 82h/83h) and DPTR1 (84h/85h), selected via the DPS bit (bit 0 of SFR 86h). Software toggles DPS to switch active DPTR with a single INC instruction, enabling zero-overhead switching between source and destination addresses during memory block transfers. This feature is documented in the DUAL DATA POINTER section and verified in the Instruction Set Summary timing tables.
Can the DS80C323-ECD operate from a 3.3V supply?
Yes, the DS80C323-ECD is fully specified to operate from 2.7V to 5.5V, making it compatible with standard 3.3V logic systems without level shifters. This is explicitly stated in the DETAILED DESCRIPTION and ORDERING INFORMATION sections. Unlike the DS80C320 variant (4.25–5.5V only), the DS80C323-ECD's wider voltage range supports direct integration into mixed-supply or battery-depleted environments.
What are the key differences between DS80C323-ECD and DS80C320-ECL?
The DS80C323-ECD and DS80C320-ECL share identical pinout, instruction set, and peripheral features but differ in voltage range (2.7–5.5V vs. 4.25–5.5V) and maximum clock speed (18MHz vs. 33MHz). DS80C323-ECD targets low-power and battery-operated applications, while DS80C320-ECL prioritizes raw performance in 5V industrial systems. Both use the same 44-pin TQFP package and are functionally interchangeable where voltage and speed constraints align.
DS80C323-ECD Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package/Case:
- 44-TQFP
- Series:
- 80C
- Packaging:
- Tray
- 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-ECD FAQ
1.How can I place an order for DS80C323-ECD through Aetrix?
Please submit a Request for Quotation (RFQ) for DS80C323-ECD 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-ECD reliable?
The price and inventory of DS80C323-ECD are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DS80C323-ECD is usually 5 days.
3.What payment methods are accepted for DS80C323-ECD?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DS80C323-ECD transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DS80C323-ECD?
DS80C323-ECD orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DS80C323-ECD 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-ECD?
For technical support, including DS80C323-ECD datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DS80C323-ECD requirements.
6.How does Aetrix verify that DS80C323-ECD is sourced from the original manufacturer or authorized distributors?
All DS80C323-ECD 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-ECD meets industry standards.
7.What is the process for return or replacement of DS80C323-ECD?
All DS80C323-ECD units undergo pre-shipment inspection (PSI). If there is an issue with DS80C323-ECD, 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-ECD part is unused and in its original packaging.
Return procedure for DS80C323-ECD:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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