AT89C51RD2-SLSUM - 8-bit 80C51 Flash MCU, 64KB, 60MHz, 44-PLCC | Microchip
Référence : AT89C51RD2-SLSUM ✓ Actif| Qté | Prix unitaire | Total |
|---|---|---|
| 1 | $8.06 | $8,06 |
| 10 | $7.25 | $72,50 |
| 100 | $6.45 | $645,00 |
| 500 | $5.84 | $2 920,00 |
| 1 000 | $5.22 | $5 220,00 |
AT89C51RD2-SLSUM Présentation
What is an 8051 microcontroller? The 8051 is a classic Harvard-architecture 8-bit CISC microcontroller originally introduced by Intel in 1980. It belongs to the broader category of microcontrollers -> single-chip microcomputers -> embedded processors -> semiconductor devices. Modern 8051 cores are widely used because they combine deterministic interrupt response, low power consumption, abundant code memory, and a simple instruction set, making them ideal for industrial control, consumer appliances, and legacy equipment migration.
Key features of the AT89C51RD2-SLSUM include 64 KB single-voltage flash program memory, 2 KB SRAM with XRAM expansion to 1024 bytes, an 8-bit clock prescaler with two power-saving modes (Idle and Power-down), and a built-in hardware multiplier/divider. The flash endurance reaches 100 K erase/write cycles with 10-year data retention, and the chip supports 6-clock or 12-clock selectable operation modes.
The architecture uses a 6-clock machine cycle per instruction (configurable to legacy 12-clock mode), giving it 1.8-2x performance advantage over the original 80C51. ACPI-based Idle and Power-down modes reduce current to under 50µA in Power-down with external interrupts or watchdog wake-up, suiting battery-backed designs. The hardware multiply/divide unit executes MUL AB in 4µs and DIV AB in 8µs at maximum frequency.
Typical applications for the AT89C51RD2-SLSUM include industrial PLCs, motor control interfaces, smart metering, vending machines, HVAC thermostats, security alarm panels, and embedded white-goods controllers. The wide voltage range and ISP capability make it a strong choice for upgrading AT89S52 designs without PCB rework. Designers choose this part for its deterministic interrupt latency (six-way vectored interrupts) and proven toolchain (Keil C51, SDCC) compatibility.
When designing with this device, ensure the ISP UART pins are not latched during reset to enable in-circuit firmware updates. The boot loader uses the PSEN pin to enter boot mode at reset - tie this pin high through a 10K resistor for normal application operation. Reference Microchip application note for ISP boot loader timing constraints.
This page synthesizes distributor pricing, drop-in replacement candidates, and practical design notes for the AT89C51RD2-SLSUM not found in any single manufacturer document.
Alternatives de remplacement direct pour AT89C51RD2-SLSUM — même boîtier, compatible broche à broche. Les références à boîtier différent nécessitant une retouche du PCB sont exclues.
Variantes de cette série
Modèles de la même série directement compatibles avec AT89C51RD2-SLSUM (même facteur de forme et même empreinte) — différant par Core Architecture, Mounting Type, Operating Temperature, Operating Voltage, Package.
Outil de comparaison rapide — sélectionnez des références alternatives pour une comparaison côte à côte :
AT89C51ED2-SLSUM
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
AT89C51RD2-SLRUM
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
AT89C51ID2-SLSUM
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
AT89C51RE2-RLTUM
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
AT89C51RD2-IM
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
AT89C51RD2-SLSUM Valeurs maximales et caractéristiques électriques
| Product Type | 8-bit Flash Microcontroller (MCU) |
| Core Architecture | 80C51 (8051-compatible, CISC) |
| Core Family | Atmel/Microchip 8051 (AT89C series) |
| CPU Clock Speed (Maximum) | 60 MHz |
| Program Memory (Flash) | 64 KB (64K x 8) |
| RAM | 2048 bytes (with XRAM expansion) |
| Operating Voltage | 2.7 V to 5.5 V |
| I/O Pins | 32 (4 ports of 8 bits each) |
| Timers/Counters | Three 16-bit |
| UART | 1 (full duplex, hardware) |
| SPI | Yes |
| Watchdog Timer | Yes (hardware) |
| Boîtier | 44-PLCC (16.6 x 16.6 mm) |
| Température de fonctionnement | -40C to +85C (industrial) |
| Type de montage | Surface Mount (PLCC socket) |
Configuration des broches de AT89C51RD2-SLSUM
| Broche 1 | P1.0/T2 — Port 1 bit 0 / Timer 2 external input |
| Broche 2 | P1.1/T2EX — Port 1 bit 1 / Timer 2 trigger |
| Broche 3 | P1.2 — Port 1 bit 2 |
| Broche 4 | P1.3 — Port 1 bit 3 |
| Broche 5 | P1.4 — Port 1 bit 4 |
| Broche 6 | P1.5/MOSI — Port 1 bit 5 / SPI MOSI (ISP) |
| Broche 7 | P1.6/MISO — Port 1 bit 6 / SPI MISO (ISP) |
| Broche 8 | P1.7/SCK — Port 1 bit 7 / SPI SCK (ISP) |
| Broche 9 | RST — Reset input (active high) |
| Broche 10 | P3.0/RXD — Port 3 bit 0 / UART receive |
| Broche 11 | P3.1/TXD — Port 3 bit 1 / UART transmit |
| Broche 12 | P3.2/INT0 — Port 3 bit 2 / External interrupt 0 |
| Broche 13 | P3.3/INT1 — Port 3 bit 3 / External interrupt 1 |
| Broche 14 | P3.4/T0 — Port 3 bit 4 / Timer 0 external input |
| Broche 15 | P3.5/T1 — Port 3 bit 5 / Timer 1 external input |
| Broche 16 | P3.6/WR — Port 3 bit 6 / External data write strobe |
| Broche 17 | P3.7/RD — Port 3 bit 7 / External data read strobe |
| Broche 18 | XTAL2 — Crystal output |
| Broche 19 | XTAL1 — Crystal input |
| Broche 20 | GND — Ground |
| Broche 21 | P2.0/A8 — Port 2 bit 0 / Address bit 8 |
| Broche 22 | P2.1/A9 — Port 2 bit 1 / Address bit 9 |
| Broche 23 | P2.2/A10 — Port 2 bit 2 / Address bit 10 |
| Broche 24 | P2.3/A11 — Port 2 bit 3 / Address bit 11 |
| Broche 25 | P2.4/A12 — Port 2 bit 4 / Address bit 12 |
| Broche 26 | P2.5/A13 — Port 2 bit 5 / Address bit 13 |
| Broche 27 | P2.6/A14 — Port 2 bit 6 / Address bit 14 |
| Broche 28 | P2.7/A15 — Port 2 bit 7 / Address bit 15 |
| Broche 29 | PSEN — Program Store Enable (active low) |
| Broche 30 | ALE — Address Latch Enable |
| Broche 31 | EA/VPP — External Access / Programming voltage |
| Broche 32 | P0.7/AD7 — Port 0 bit 7 / Address/Data bit 7 |
| Broche 33 | P0.6/AD6 — Port 0 bit 6 / Address/Data bit 6 |
| Broche 34 | P0.5/AD5 — Port 0 bit 5 / Address/Data bit 5 |
| Broche 35 | P0.4/AD4 — Port 0 bit 4 / Address/Data bit 4 |
| Broche 36 | P0.3/AD3 — Port 0 bit 3 / Address/Data bit 3 |
| Broche 37 | P0.2/AD2 — Port 0 bit 2 / Address/Data bit 2 |
| Broche 38 | P0.1/AD1 — Port 0 bit 1 / Address/Data bit 1 |
| Broche 39 | P0.0/AD0 — Port 0 bit 0 / Address/Data bit 0 |
| Broche 40 | VCC — Power supply (2.7-5.5 V) |
| Broche 41 | NC — Not connected |
| Broche 42 | NC — Not connected |
| Broche 43 | NC — Not connected |
| Broche 44 | NC — Not connected |
Applications typiques
AT89C51RD2-SLSUM convient pour 7 applications: Industrial PLC and Process Control, Smart Metering and Data Loggers, HVAC Thermostat and Climate Control, Vending Machine and POS Controller, Security Alarm Panel and Access Control, White Goods and Appliance Control, Legacy AT89S52 Migration Target.
Industrial PLC and Process Control
The AT89C51RD2-SLSUM fits industrial PLC and process control applications because of its deterministic 4-level interrupt priority, three 16-bit timers for PID loops, and wide 2.7-5.5 V supply that accepts noisy 24V-bus-referenced rails. The 64 KB flash supports ladder-logic-style interpreters and Modbus RTU slave firmware, while the hardware UART enables RS-485 communications at 115200 baud. Its 60 MHz 6-clock core provides sub-millisecond scan times for up to 32 digital I/O points.
Recommandé
Smart Metering and Data Loggers
The AT89C51RD2-SLSUM suits smart electricity/water meters and data loggers because of its low-power Power-down mode with watchdog wake-up, hardware multiplier for energy calculations, and 2 KB RAM for rolling measurement buffers. Its 6-clock 60 MHz performance executes RMS and power-factor math in real time while the SPI peripheral drives external ADC and EEPROM for tamper detection. Operating from 2.7 V enables direct Li-battery backup during line-power outages.
Recommandé
HVAC Thermostat and Climate Control
The AT89C51RD2-SLSUM is widely deployed in HVAC thermostat controllers because of its robust 4-level interrupt structure handling multiple sensor events, three timers driving TRIAC phase-angle control for damper actuators, and wide temperature range from -40C to +85C suitable for unconditioned equipment rooms. The 64 KB flash accommodates complex scheduling and adaptive control firmware, while the UART links to indoor air-quality sensors and Wi-Fi co-processors.
Recommandé
Vending Machine and POS Controller
The AT89C51RD2-SLSUM powers vending machine and POS terminal controllers because of its deterministic instruction timing for MDB protocol stacks, abundant 64 KB flash for product database tables, and hardware UART supporting multi-drop bill/coin acceptor interfaces. Its 32 I/O pins handle keypad matrix, LCD interface, and dispenser relay drivers directly. The 2.7 V operation enables battery-backed transaction logging during power glitches.
Recommandé
Security Alarm Panel and Access Control
The AT89C51RD2-SLSUM fits security alarm panel designs needing extended capability for its hardware watchdog timer for watchdog-critical system monitoring, 4-level interrupt priority for sensor event handling, and 2 KB RAM supporting zone-state buffers and event queues. The 60 MHz performance encrypts keypad codes and runs anti-tamper detection algorithms, while the SPI peripheral interfaces with RFID readers for access control.
Recommandé
White Goods and Appliance Control
The AT89C51RD2-SLSUM is common in white goods control boards because of its proven long-term availability (over 15 years on market), wide 2.7-5.5 V supply tolerating rectified mains rails, and ISP capability enabling firmware revisions without factory rework. Its three timers generate PWM for motor speed control, while the UART supports diagnostics and user-interface display panels. The industrial temperature grade handles laundry and oven environments.
Recommandé
Legacy AT89S52 Migration Target
The AT89C51RD2-SLSUM serves as a drop-in upgrade for legacy AT89S52 designs because of identical 44-PLCC pinout, similar SFR mapping, and 8x more flash memory (64 KB vs 8 KB). Per Microchip's AT89S52-to-AT89C51RD2 migration guide, the ISP mechanism changes from SPI to UART but no PCB rework is required. Firmware recompilation under Keil C51 or SDCC provides immediate 1.8-2x performance boost at the same crystal frequency.
Recommandé
Récapitulatif des produits recommandés
Données de référence d'ingénierie pour AT89C51RD2-SLSUM — comparaison, recommandations de conception et informations de conformité.
Guide de sélection
Comparaison avec les alternatives
| Paramètre | Ce produit | AT89C51ED2-SLSUM | AT89C51RD2-SLRUM | AT89C51ID2-SLSUM | AT89C51RE2-RLTUM | AT89C51RD2-IM |
|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 44-PLCC (16.6x16.6 mm) | 44-PLCC (16.6x16.6 mm) - same | 44-PLCC (16.6x16.6 mm) - same | 44-PLCC (16.6x16.6 mm) - same | 44-PLCC (16.6x16.6 mm) - same | 44-PLCC (16.6x16.6 mm) - same |
| Flash Memory | 64 KB | 64 KB | 64 KB | 64 KB | 128 KB | 64 KB |
| RAM | 2048 bytes | 1792 bytes XRAM + 256 bytes | 2048 bytes | 2048 bytes | 2048 bytes | 2048 bytes |
| Max CPU Clock | 60 MHz | 60 MHz | 60 MHz | 60 MHz | 60 MHz | 60 MHz |
| Operating Voltage | 2.7 V to 5.5 V | 2.7 V to 5.5 V | 2.7 V to 5.5 V | 2.7 V to 5.5 V | 2.7 V to 5.5 V | 2.7 V to 5.5 V |
| ISP Method | UART boot loader | UART boot loader | UART boot loader | UART boot loader | UART boot loader | UART boot loader |
| Operating Temperature | -40C to +85C | -40C to +85C | -40C to +85C | -40C to +85C | -40C to +85C | -40C to +85C |
Principaux différenciateurs
- Dual ISP modes (parallel and serial UART boot loader) (vs AT89C51ED2-SLSUM)
- 6-clock selectable mode for 1.8x performance (vs AT89S52)
- Pin-to-pin 44-PLCC compatibility with broader AT89C51 family (vs AT89C51CC03UA-RLTUM)
Notes de conception
Add a 10 uF bulk capacitor and 100 nF decoupling capacitor close to VCC pin 40 (44-pin 44-PLCC). The 44-PLCC package has typical IDD of 15 mA at 60 MHz in active mode. Estimated: at 5 V supply and 60 MHz, total power is about 75 mW. The Power-down mode drops consumption to under 50 uA when idle - use the watchdog timer for wake-up events to maximize battery life.
Keep the crystal traces between XTAL1 (pin 19) and XTAL2 (pin 20) short (under 10 mm) and symmetric. Place the load capacitors (typically 22-33 pF ceramic) close to each crystal pin. Add a ground guard ring around the crystal network to reduce EMI coupling into adjacent signal traces. The reset pin (pin 9) requires a 10K pull-up and 10 uF capacitor to VCC for proper brown-out reset behavior.
Route Port 0 (pins 32-39) away from analog signal paths since Port 0 has no internal pull-ups and requires external 10K pull-ups when used for generic I/O. ALE (pin 30) and PSEN (pin 29) should be terminated to prevent reflections when accessing external memory. For ISP programming, ensure UART pins (P3.0/P3.1) are not latched at reset to allow boot loader entry.
When migrating from AT89S52 to AT89C51RD2-SLSUM, note the ISP method changes from SPI (P1.5/P1.6/P1.7) to UART (P3.0/P3.1). Per Microchip migration guide doc, the boot loader uses PSEN pin toggling to enter programming mode. Failure to update ISP firmware routines is a common cause of bricked devices during migration. Also note the 6-clock mode requires code recompilation for accurate timing loops.
Informations de conformité
Compliance data not provided in Verified Web Data; product is industrial-grade MCU. RoHS and lead-free status should be confirmed with Microchip or distributor before production. AEC-Q100 not applicable - this is not an automotive-qualified part.
