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

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AT89C51ED2-RDTIM - Microchip Technology

Name: Microchip Technology AT89C51ED2-RDTIM
Brand: Microchip Technology
SKU: AT89C51ED2-RDTIM
Availability: InStock
Rating: 5 (7 reviews)

Manufacturer Part Number: AT89C51ED2-RDTIM

Manufacturer: Microchip Technology

Allelco Part Number: 32D-AT89C51ED2-RDTIM

Warranty: 1 Year Allelco Warranty - Find out more

Stock Status:: 7,150 pcs available, New & Original

Parts Description: IC MCU 8BIT 64KB FLASH 44VQFP

Package: 44-VQFP (10x10)

Data sheet: AT89C51ED2-RDTI.pdf

Datasheets
Cylindrical Battery Holders.pdf

PCN Packaging
MBB/Label Chgs 16/Nov/2018.pdf Transfer to Microchip/Label/Pkg 5/Sep/2016.pdf

RoHs Status

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Our certification

In stock: 7150

Specifications

AT89C51ED2-RDTIM Tech Specifications
Microchip Technology - AT89C51ED2-RDTIM technical specifications, attributes, parameters and parts with similar specifications to Microchip Technology - AT89C51ED2-RDTIM

Product Attribute	Attribute Value
Manufacturer	Microchip Technology
Voltage - Supply (Vcc/Vdd)	2.7V ~ 5.5V
Supplier Device Package	44-VQFP (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	44-LQFP
Package	Tray

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	RoHS non-compliant
Moisture Sensitivity Level (MSL)	3 (168 Hours)
REACH Status	REACH Unaffected
ECCN	3A991A2
HTSUS	8542.31.0001

Parts Introduction

AT89C51ED2-RDTIM (1)

Manufacturer Part Number

AT89C51ED2-RDTIM

Manufacturer

Microchip Technology

Introduction

8-Bit Flash Microcontroller with 60MHz processor speed and advanced features for embedded control

Product Features and Performance

8-Bit 80C51 Core Processor

High Performance with 60MHz operating speed

SPI and UART/USART connectivity for serial communication

Power On Reset, Pulse Width Modulation, Watchdog Timer for system reliability

34 Programmable Input/Output lines

Large 64KB FLASH Program Memory

2048 Bytes EEPROM and RAM each for data storage

Operating voltage range of 2.7V to 5.5V, suitable for various power supplies

External Oscillator support for precise clocking

Product Advantages

Advanced features for complex applications

Higher speed for performance-intensive operations

Ample memory for extensive programming and data storage

Wide operating voltage suitable for different power environments

Robust I/O count for complex interfacing

Key Technical Parameters

Core Processor: 80C51, 8-Bit

Speed: 60MHz

Program Memory: 64KB FLASH

EEPROM Size: 2K x 8

RAM Size: 2K x 8

Number of I/O: 34

Voltage Supply: 2.7V ~ 5.5V

Operating Temperature: -40°C ~ 85°C

Mounting Type: Surface Mount

Package: 44-VQFP (10x10), 44-LQFP

Quality and Safety Features

Power On Reset prevents malfunction after power supply instability

Watchdog Timer for system recovery in abnormal conditions

Compatibility

Compatible with various external peripherals through SPI, UART/USART

Adaptable voltage range for compatibility with different circuits

Application Areas

Industrial Control Systems

Consumer Electronics

Automotive Electronics

Communication Devices

Product Lifecycle

Product Status: Obsolete

Seek alternative products or last-time buys

Several Key Reasons to Choose This Product

High-speed performance essential for real-time applications

Robust programming and data storage capacity

Multiple connectivity options for greater design flexibility

Integrated safety features for enhanced reliability

Wide voltage range allowing for flexible power design

Suitable for a wide range of temperature environments

Frequently Asked Questions(FAQ)

How does the AT89C51ED2-RDTIM compare to other 80C51-based microcontrollers when considering program memory size and operating voltage range for battery-powered embedded applications?: The AT89C51ED2-RDTIM offers a 64KB FLASH program memory configuration that aligns with legacy 80C51 architecture while supporting a wide supply voltage range from 2.7V to 5.5V, making it suitable for mixed-voltage systems. This voltage flexibility enables use in both 3.3V and lower-voltage environments, which can extend battery life compared to fixed-voltage solutions. However, many modern 80C51-compatible alternatives offer larger memory densities or integrated power management features, so designers must evaluate whether the 64KB limit and lack of advanced peripherals justify continued use of this part.

What are the key trade-offs when selecting the AT89C51ED2-RDTIM for high-reliability industrial control applications requiring extended temperature operation?: While the AT89C51ED2-RDTIM operates within a commercial temperature range of -40°C to 85°C, its non-compliance with RoHS standards may pose challenges in certain regulated industrial environments where lead-free assembly is mandatory. Additionally, the absence of enhanced error-checking mechanisms or built-in safety peripherals common in newer automotive or industrial MCUs means designers must implement external safeguards. The 60MHz maximum speed and limited RAM (2K x 8) also constrain real-time performance in complex control loops.

In what scenarios would the AT89C51ED2-RDTIM be preferable over the AT89C51ED2-RDTUM variant, particularly regarding packaging and thermal characteristics?: The AT89C51ED2-RDTIM uses a standard 44-VQFP (10x10) package, whereas the RDTUM variant typically employs a TQFN package with better thermal resistance and smaller footprint. Therefore, the RDTIM is more appropriate when board space is not constrained but ease of soldering and inspection is prioritized. Conversely, if thermal dissipation or miniaturization is critical, the TQFN version would be favored despite potential differences in pin compatibility during migration.

How does the oscillator type requirement impact system design when using the AT89C51ED2-RDTIM, and what clock accuracy considerations apply?: The AT89C51ED2-RDTIM relies on an external oscillator, which introduces additional component count and potential frequency drift due to temperature variations or component tolerance. For timing-critical applications like UART baud rate generation or PWM synchronization, this demands careful selection of crystal quality and load capacitance matching. Designers must allocate PCB space for the oscillator circuit and consider stability across the full operating temperature range (-40°C to 85°C), especially if precise communication protocols are implemented.

What is the significance of the 2K x 8 EEPROM and 2K x 8 RAM sizes in the context of data logging or firmware update routines using the AT89C51ED2-RDTIM?: With only 2KB of internal RAM and 2KB of EEPROM, the AT89C51ED2-RDTIM imposes strict limits on runtime data buffering and non-volatile storage capacity. For applications requiring persistent configuration settings or buffered sensor data, external SRAM or EEPROM may be necessary, increasing BOM cost and complexity. Firmware updates via bootloaders are feasible but constrained by memory layout, necessitating careful partitioning of code and variables.

How do the available I/O pins (34 total) influence peripheral expansion strategies when integrating sensors or actuators with the AT89C51ED2-RDTIM?: The 34 bidirectional I/O lines provide sufficient connectivity for moderate peripheral loads such as ADCs, displays, or motor drivers. However, simultaneous use of multiple serial interfaces (SPI, UART/USART) and PWM channels may require pin multiplexing or time-division strategies. Given the shared bus architecture of the 80C51 core, parallel access to high-speed peripherals could introduce contention unless properly managed through software arbitration.

Can the AT89C51ED2-RDTIM support real-time operating systems (RTOS) effectively, and what memory constraints should be considered?: Due to its limited RAM (2K x 8), running an RTOS with task scheduling, queues, and semaphores is possible only for very simple systems with few concurrent tasks. Context switching overhead and stack usage would consume a significant portion of the available memory, leaving minimal space for application data. Most RTOS implementations require at least 8–16KB of RAM, suggesting that bare-metal programming or lightweight cooperative schedulers are more practical choices.

What are the implications of the Moisture Sensitivity Level (MSL) rating of 3 for manufacturing processes involving the AT89C51ED2-RDTIM?: Classified as MSL 3 with a floor life of 168 hours, the AT89C51ED2-RDTIM requires storage under controlled humidity conditions after dry-packaging is opened. Manufacturers must follow JEDEC guidelines for bake-out procedures before reflow soldering to prevent popcorning damage. This adds logistical complexity and cost to production workflows, particularly in high-volume environments where inventory turnover must be tightly managed.

How does the absence of integrated ADC/DAC converters affect signal acquisition designs using the AT89C51ED2-RDTIM?: Without built-in analog-to-digital conversion capabilities, any need for sensor interfacing—such as thermistor readings, voltage monitoring, or current sensing—requires external ADCs connected via SPI or parallel interfaces. This increases component count, power consumption, and development effort. Designers must ensure timing compatibility between the microcontroller’s 60MHz clock and the external ADC’s sampling rate to maintain measurement accuracy.

When migrating from older AT89C51 variants to the AT89C51ED2-RDTIM, what architectural changes might be needed despite core compatibility?: Although the core remains 80C51-compatible, differences in memory organization, peripheral register mapping, and interrupt handling may necessitate modifications to existing firmware. Additionally, the expanded program memory to 64KB allows larger codebases but requires updated linker scripts and memory allocation logic. Careful regression testing is essential to verify timing-sensitive operations like timer overflow interrupts or serial communication protocols.

Parts with Similar Specifications

The three parts on the right have similar specifications to Microchip Technology AT89C51ED2-RDTIM

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

AT89C51ED2-RDTIM Datasheet PDF

Download AT89C51ED2-RDTIM pdf datasheets and Microchip Technology documentation for AT89C51ED2-RDTIM - Microchip Technology.

Datasheets: Cylindrical Battery Holders.pdf
PCN Packaging: MBB/Label Chgs 16/Nov/2018.pdf Transfer to Microchip/Label/Pkg 5/Sep/2016.pdf

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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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Common Countries Logistic Time Reference
Region	Country	Logistic Time(Day)
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

DHL & FedEx Shipment Charges Reference
Shipment charges(KG)	Reference DHL(USD$)
0.00kg-1.00kg	USD$30.00 - USD$60.00
1.00kg-2.00kg	USD$40.00 - USD$80.00
2.00kg-3.00kg	USD$50.00 - USD$100.00

Note:: The above table is for reference only. There may have some data bias for the uncontrollable factors.
Contact us if you have any questions.

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