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Home Products Integrated Circuits (ICs)Embedded - Microcontrollers~~AT89C51ED2-RDRUM~~

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AT89C51ED2-RDRUM - Atmel

Name: Atmel AT89C51ED2-RDRUM
Brand: Atmel
SKU: AT89C51ED2-RDRUM
Availability: InStock
Rating: 5 (5 reviews)

Manufacturer Part Number: AT89C51ED2-RDRUM

Manufacturer: Atmel

Allelco Part Number: 98D-AT89C51ED2-RDRUM

Warranty: 1 Year Allelco Warranty - Find out more

Stock Status:: 10,648 pcs available, New & Original

Parts Description: IC MCU 8BIT 64KB FLASH 64LQFP

Package: 64-LQFP (10x10)

Data sheet: -

RoHs Status

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In stock: 10648

Specifications

AT89C51ED2-RDRUM Tech Specifications
Atmel - AT89C51ED2-RDRUM technical specifications, attributes, parameters and parts with similar specifications to Atmel - AT89C51ED2-RDRUM

Product Attribute	Attribute Value
Manufacturer	Atmel
Voltage - Supply (Vcc/Vdd)	2.7V ~ 5.5V
Supplier Device Package	64-LQFP (10x10)
Speed	60MHz
Series	89C
RAM Size	2K x 8
Program Memory Type	FLASH
Program Memory Size	64KB (64K x 8)
Peripherals	POR, PWM, WDT
Package / Case	64-LQFP
Package	Bulk

Product Attribute	Attribute Value
Oscillator Type	External
Operating Temperature	-40°C ~ 85°C (TA)
Number of I/O	50
Mounting Type	Surface Mount
EEPROM Size	2K x 8
Data Converters	-
Core Size	8-Bit
Core Processor	80C51
Connectivity	SPI, UART/USART
Base Product Number	AT89C51

Environmental & Export Classifications

ATTRIBUTE	DESCRIPTION
RoHs Status	Not applicable
Moisture Sensitivity Level (MSL)	3 (168 Hours)
REACH Status	Vendor Undefined
ECCN	3A991A2
HTSUS	8542.31.0001

Frequently Asked Questions(FAQ)

How does the AT89C51ED2-RDRUM compare to other 80C51-based microcontrollers in terms of program memory capacity and operating voltage range for industrial control applications?: The AT89C51ED2-RDRUM offers a 64KB Flash program memory configuration, which is notably larger than many legacy 80C51 implementations that typically max out at 32KB. This expanded memory capacity enables more complex firmware routines without external code storage components. Coupled with its wide operating voltage range of 2.7V to 5.5V, the device maintains reliable operation across diverse power supply conditions commonly encountered in industrial environments where voltage regulation may vary significantly.

What are the key differences between the AT89C51ED2-RDRUM and standard AT89C51 devices regarding clock speed and peripheral integration?: While both belong to the 80C51 family, the AT89C51ED2-RDRUM achieves a maximum clock frequency of 60MHz, substantially higher than the traditional 12-24MHz limit of standard AT89C51 variants. This increased speed allows for faster interrupt response times and improved throughput in time-critical applications. Additionally, it includes integrated peripherals such as PWM modules and watchdog timers—features not always present in basic AT89C51 designs—reducing reliance on external components and simplifying board layout.

Is the AT89C51ED2-RDRUM suitable for battery-powered embedded systems requiring low-power operation and extended runtime?: Although the AT89C51ED2-RDRUM does not feature advanced ultra-low-power modes like some modern MCUs, its 2.7V to 5.5V supply range supports efficient operation down to 2.7V, enabling compatibility with single-cell Li-ion or alkaline batteries. When combined with careful firmware design—such as minimizing active time and leveraging sleep states during idle periods—the device can deliver acceptable battery life for intermittent sensing or monitoring applications, though continuous high-speed operation will accelerate discharge.

How does the package type of the AT89C51ED2-RDRUM impact thermal performance and PCB footprint in space-constrained designs?: The 64-LQFP (10x10) package provides a compact surface-mount form factor with 50 I/O pins, making it ideal for densely populated PCBs. However, its relatively small size limits heat dissipation compared to through-hole or larger packages. In high-frequency operation near 60MHz, localized heating may occur, so adequate copper pour and thermal vias are recommended. The Tape & Reel packaging also facilitates automated assembly, supporting high-volume manufacturing while maintaining consistent placement accuracy.

Can the AT89C51ED2-RDRUM interface directly with SPI-based sensors and UART-connected modules simultaneously without requiring additional logic?: Yes, the AT89C51ED2-RDRUM features dedicated hardware support for both SPI and UART/USART communication interfaces. This allows concurrent data exchange with multiple peripheral devices—for example, reading an SPI temperature sensor while transmitting status updates via UART—without CPU overhead or bus contention issues. The presence of these peripherals reduces external component count and simplifies real-time system architecture.

What considerations should be made when selecting an oscillator for the AT89C51ED2-RDRUM to achieve stable 60MHz operation?: Since the AT89C51ED2-RDRUM uses an external oscillator, achieving reliable 60MHz operation requires a crystal or resonator with sufficient stability (±20 ppm or better), low aging characteristics, and appropriate load capacitance matching. A fundamental frequency of 12MHz would require a ×5 PLL multiplier internally, but Microchip’s implementation likely uses direct clocking. Careful PCB layout with short traces, ground planes under the crystal, and minimized capacitive loading ensures phase noise remains within microcontroller tolerances.

How does the EEPROM size of the AT89C51ED2-RDRUM influence non-volatile data logging strategies in field-deployed devices?: With 2KB of internal EEPROM (2K x 8), the AT89C51ED2-RDRUM provides limited but useful non-volatile storage for configuration settings, calibration coefficients, or event counters. For moderate logging needs—such as storing sensor thresholds or diagnostic flags—this suffices without external serial EEPROMs. However, for high-frequency data acquisition exceeding hundreds of samples per second, external FRAM or SD card interfaces become necessary due to write endurance limits (~100k cycles) and latency constraints of internal EEPROM programming.

What role does the Watchdog Timer (WDT) play in enhancing reliability when using the AT89C51ED2-RDRUM in unattended applications?: The integrated WDT prevents system hangs caused by software faults or stack overflows by resetting the microcontroller if the main loop fails to periodically clear the timer. In remote or industrial deployments—where physical access is limited—this feature significantly improves uptime. Proper implementation involves configuring the WDT period according to application timing requirements and ensuring critical tasks execute within that window to avoid unintended resets.

Does the AT89C51ED2-RDRUM support in-system programming (ISP) and what tools are needed for firmware updates?: Yes, the AT89C51ED2-RDRUM supports in-system programming via standard ISP protocols, allowing flash reprogramming without removing the device from the circuit. This requires an external programmer compatible with 80C51 architecture, such as a USBASP or custom bootloader-enabled interface, along with appropriate voltage levels (2.7–5.5V). Firmware updates can then be performed over UART or SPI, depending on pin availability and design constraints.

How does the operating temperature range of the AT89C51ED2-RDRUM affect deployment in automotive or outdoor environments?: Rated from -40°C to 85°C, the AT89C51ED2-RDRUM meets industrial temperature standards, making it viable for outdoor enclosures or automotive accessory modules. However, unlike AEC-Q100-qualified parts, it lacks automotive-grade validation, so environmental stress testing should still be conducted for safety-critical systems. Thermal derating above 70°C may be necessary in poorly ventilated housings to maintain long-term reliability.

What trade-offs exist between using the AT89C51ED2-RDRUM versus newer ARM Cortex-M0+ MCUs for energy-efficient wireless sensor nodes?: While the AT89C51ED2-RDRUM consumes less static current than most ARM cores in sleep mode, its 8-bit architecture and lack of hardware DSP instructions result in slower signal processing and higher CPU utilization for mathematical operations. Newer Cortex-M0+ MCUs offer deterministic low-latency wake-up times, native USB, and lower overall system power when paired with efficient RF transceivers—making them preferable for battery-operated IoT endpoints despite higher active-mode current.

How does the Moisture Sensitivity Level (MSL) of 3 for the AT89C51ED2-RDRUM influence handling and storage before reflow soldering?: With MSL3 classification (168-hour floor life at 30°C/60% RH), the AT89C51ED2-RDRUM must be stored in dry environments or desiccated packaging after opening. Once unsealed, assembly must occur within 168 hours unless baked prior to reflow to prevent moisture-induced cracking during thermal cycling. This aligns with standard SMT practices and necessitates careful inventory management in high-reliability production runs.

Can the AT89C51ED2-RDRUM drive multiple LED arrays or motor drivers directly from its GPIO pins without buffering?: The 50-pin I/O structure allows flexible pin assignment, but driving high-current loads like LED strings or DC motors directly risks exceeding individual pin sourcing/sinking limits (typically ±20mA per pin). For loads above this threshold, external transistors or driver ICs are required. Using built-in PWM capabilities can help manage average current through LEDs efficiently, reducing peak demand on GPIOs.

What impact does the Flash memory type have on firmware update frequency and system recovery options with the AT89C51ED2-RDRUM?: As a Flash-based device, the AT89C51ED2-RDRUM supports byte-level erasure and reprogramming, enabling partial firmware updates and fail-safe rollback mechanisms. However, repeated writes accelerate wear-out; thus, frequent updates should target specific sectors rather than the entire 64KB block. This flexibility aids remote diagnostics but demands robust bootloader logic to ensure integrity during interrupted programming sequences.

How does the UART baud rate generator configuration affect communication reliability at maximum clock speed with the AT89C51ED2-RDRUM?: At 60MHz, the UART module must use precise divisor values derived from the crystal frequency to achieve accurate baud rates (e.g., 115200 bps). Small deviations due to oscillator tolerance or integer rounding errors increase framing error risk. Therefore, a stable reference clock and conservative baud rate selection (e.g., 9600 instead of 115200) enhance link robustness in noisy environments.

What advantages does the LQFP package provide over SOIC for prototyping and debugging with the AT89C51ED2-RDRUM?: The 64-LQFP (10x10) offers superior pin accessibility compared to SOIC variants, simplifying probing with test clips and reducing solder bridging risks during hand-assembly. Its square shape also facilitates alignment on perf boards and supports automated bed-of-nails testing. However, fine-pitch pads require precision soldering tools to avoid shorts during manual prototyping.

How does the lack of ADC functionality in the AT89C51ED2-RDRUM influence analog signal conditioning choices in mixed-signal designs?: Without integrated ADCs, analog inputs require external ADC chips interfaced via SPI or parallel buses. This adds component cost and complexity but allows customization of resolution (e.g., 12-bit vs. 10-bit) and sampling speed per application needs. Designers must account for reference voltage stability and anti-aliasing filtering when integrating third-party ADC solutions.

What steps are necessary to verify compatibility of the AT89C51ED2-RDRUM with existing 80C51-based toolchains and development environments?: Most legacy 80C51 compilers (Keil, SDCC) support the AT89C51ED2-RDRUM with minor configuration adjustments, particularly for linker scripts addressing its 64KB Flash layout and 2KB RAM. Hardware debuggers must recognize the part ID via ISP handshake. Verification includes compiling a minimal blink program, confirming correct vector table offsets, and validating oscillator startup timing under worst-case temperature conditions.

Parts with Similar Specifications

The three parts on the right have similar specifications to Atmel AT89C51ED2-RDRUM

Product Attribute
Part Number	AT89C51ED2-RDRUM	AT89C51ED2-RDRIM	AT89C51ED2-RDTUM	AT89C51ED2-RDTUM
Manufacturer	Microchip Technology	Microchip Technology	Microchip Technology	Atmel
Oscillator Type	-	-	-	-
Package / Case	-	196-LFBGA	16-DIP (0.300', 7.62mm)	64-VFQFN Exposed Pad
Core Size	-	-	-	-
Supplier Device Package	-	196-NFBGA (12x12)	16-PDIP	64-VQFN (9x9)
Peripherals	-	-	-	-
Core Processor	-	-	-	-
Program Memory Size	-	-	-	-
Mounting Type	-	Surface Mount	Through Hole	Surface Mount
Data Converters	-	-	-	-
EEPROM Size	-	-	-	-
Connectivity	-	-	-	-
Base Product Number	-	DAC34H84	MAX500	ADS62P42
Voltage - Supply (Vcc/Vdd)	-	-	-	-
Series	-	-	-	-
Speed	-	-	-	-
Package	-	Tape & Reel (TR)	Tube	Tape & Reel (TR)
Number of I/O	-	-	-	-
RAM Size	-	-	-	-
Program Memory Type	-	-	-	-
Operating Temperature	-	-40°C ~ 85°C	0°C ~ 70°C	-40°C ~ 85°C

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Customer Reviews

Evaluation: 10 Articles

Nath***rooks

Jun 11, 2026

Installed this power component in a converter board. Output remained stable under different load conditions and thermal performance was better than expected.
Dani***alkerTech

Jun 1, 2026

Product works, but setup took more effort than expected. Once configured the MCU ran reliably, although documentation support felt older compared with newer platforms. Fine for maintenance projects.
Yuki***aka88

May 26, 2026

信号通信プロジェクトでこのRS-485トランシーバーを使用しました。設置は簡単で、長距離ケーブルでも通信は安定していました。消費電力も、以前使用していたものより低くなっています。
Stev***aker

May 20, 2026

Solid diode for power rectification. Works well in switching circuits.
Bran***Lewis

May 11, 2026

Compact FPGA with good performance. Suitable for basic signal processing tasks.
Oliv***arris

May 7, 2026

Reliable I/O expander. Works well in embedded control applications.
Jess***Jones

Apr 17, 2026

It offers good value for the price, and the specifications match the description. I’ve been using it for two days with no issues, and I’ll definitely buy it again if I need it in the future.
Mich***Smith

Apr 17, 2026

Shipping was on time, the component pins are neatly aligned, and I tested 10 of them with a multimeter—all readings were within the specified range. Highly recommended.
Aman***arris

Apr 3, 2026

It was great—the entire process, from placing the order to receiving the package, went very smoothly. The components were consistent, the price was fair, and I had a very pleasant shopping experience.
Mike***nch

Apr 3, 2026

Better than expected! The resistance and capacitance readings were spot-on, and it passed the test on the first try. The service was reliable, and the packaging was thoughtful—I highly recommend it.

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America	United States	5
America	Brazil	7
Europe	Germany	5
	United Kingdom	4
	Italy	5
Oceania	Australia	6
Oceania	New Zealand	5
Asia	India	4
Asia	Japan	4
Middle East	Israel	6

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1.00kg-2.00kg	USD$40.00 - USD$80.00
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