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NXP Semiconductors P89LV51RD2BBC,557
- Part No.:
- P89LV51RD2BBC,557
- Manufacturer:
- NXP Semiconductors
- Category:
- Microcontrollers
- Package:
- 44-TQFP
- Datasheet:
-
P89LV51RD2BBC,557.pdf
- Description:
- IC MCU 8BIT 64KB FLASH 44TQFP
- Quantity:
- Payment:
- Shipping:
Inventory:4,025
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Product details
Overview
P89LV51RD2BBC from NXP Semiconductors is an 8-bit 80C51 microcontroller with 64 kB on-chip flash program memory, 1 kB data RAM, and support for both 12-clock and 6-clock (X2) machine cycle modes. It operates from 3 V at frequencies up to 33 MHz, features SPI, enhanced UART, PCA with PWM/capture/compare, and four 8-bit I/O ports - used in industrial control, sensor interface, and embedded instrumentation systems.
For engineers reviewing the P89LV51RD2BBC datasheet, P89LV51RD2BBC pinout, P89LV51RD2BBC application, or P89LV51RD2BBC equivalent, key selection considerations include its TQFP44 package, 0 °C to +70 °C temperature range, ISP/IAP capability, low-EMI ALE inhibit mode, and compatibility with legacy 80C51 toolchains and firmware.
Technical Context
The P89LV51RD2BBC implements a standard 80C51 CPU core with dual clock mode selection (12-clock default or 6-clock X2 mode), enabling either doubled throughput at same frequency or halved clock frequency for EMI reduction. Its memory architecture includes two flash blocks: 64 kB user code (Block 0) and an overlay-capable ISP/IAP boot block (Block 1).
It integrates a programmable counter array (PCA) with five capture/compare modules, three 16-bit timers/counters, a watchdog timer, brownout detection (2.35 V threshold), and power-down/idle low-power modes. All I/O ports feature internal pull-ups, with Port 1 pins P1.5–P1.7 rated for 16 mA high-current drive.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Core Architecture | 80C51 8-bit CPU with software-selectable 12- or 6-clock machine cycles |
| Flash Memory | 64 kB on-chip flash supporting ISP and IAP; organized in 512 × 128 B sectors |
| Data RAM | 1024 B internal RAM: 128 B direct/indirect, 128 B indirect-only, 768 B expanded via MOVX |
| Operating Voltage | 3 V supply, functional from 0 MHz to 33 MHz; TTL/CMOS logic level compatible |
| Temperature Range | 0 °C to +70 °C ambient operating range |
| Package | TQFP44 (SOT376-1), 10 × 10 × 1.0 mm body, 44-pin quad flat |
| Peripherals | SPI interface, enhanced UART, PCA with 5-channel PWM/capture/compare, 3×16-bit timers, WDT, brownout detect |
Pinout & Package
Package: TQFP44 (SOT376-1), plastic thin quad flat package, 10 × 10 × 1.0 mm body, 44 leads.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| P0.0–P0.7 | Port 0 bidirectional I/O / AD0–AD7 | Open-drain port; multiplexed low-order address/data bus for external memory access; requires external pull-ups for general-purpose use |
| P1.0/T2 – P1.7/SPICLK/CEX4 | Port 1 bidirectional I/O with internal pull-ups | Includes Timer2 input/output (P1.0), PCA channels CEX0–CEX4 (P1.3–P1.7), SPI signals (MOSI/MISO/SPICLK), and ECI clock input; P1.5–P1.7 support 16 mA drive |
| P2.0/A8 – P2.7/A15 | Port 2 bidirectional I/O / A8–A15 | High-order address bus for external memory; internal pull-ups enable use as general I/O when not addressing |
| P3.0/RXD – P3.7/RD | Port 3 bidirectional I/O with internal pull-ups | Dedicated functions: UART RX/TX, INT0/INT1, T0/T1, WR/RD strobes; supports external interrupt wake-up from power-down mode |
| RST | Reset input | Active-HIGH reset; two machine cycles required; enables external host mode programming when combined with PSEN transition |
| XTAL1/XTAL2 | Oscillator inputs | Connects to crystal or resonator; internal inverting amplifier drives clock generation circuitry |
| EA | External Access Enable | Strap to VDD for internal flash execution; connect to VSS to fetch code from external program memory |
| ALE/PROG | Address Latch Enable / Programming pulse | Latches P0 address during external memory access; serves as PROG input for flash programming; disabled in low-EMI mode (AO=1) |
| PSEN | Program Store Enable | Read strobe for external program memory; inactive during internal flash execution; triggers external host mode on HIGH-to-LOW transition with RST held high |
Key Features
| Feature | Design Value |
|---|---|
| X2 Mode Operation | Software-selectable 6-clock-per-machine-cycle mode doubles instruction throughput at same crystal frequency or halves frequency for EMI reduction |
| In-System Programming (ISP) | Enables field firmware updates via UART under software control without removing the device from the target system |
| In-Application Programming (IAP) | Allows reprogramming of flash memory while application code continues executing - critical for dynamic firmware patching |
| Low-EMI ALE Inhibit | Disabling ALE output (via AO bit) eliminates switching noise on address latch signal, simplifying EMC compliance in noise-sensitive designs |
| Programmable Counter Array (PCA) | Five independent capture/compare modules support PWM generation, input capture, software timers, and high-resolution event timing |
| Brownout Detection | Hardware reset triggered at 2.35 V supply threshold; optional interrupt (004BH vector) allows graceful shutdown before reset |
Applications
| Industrial PLC I/O Module | Smart Sensor Node |
|---|---|
Use Scenario: Standalone digital I/O expansion module in factory automation, accepting commands over RS-485 and driving relays, LEDs, and opto-isolators. IC Role / Device Role / Timing Role: Primary controller executing real-time I/O scanning, protocol parsing (Modbus RTU), and state machine logic with deterministic 16-bit timer-based scheduling. Use Value: 64 kB flash accommodates full protocol stack + diagnostics; PCA channels generate precise PWM for LED dimming; 16 mA Port 1 pins directly drive indicator LEDs without external buffers. | Use Scenario: Battery-powered environmental sensor node measuring temperature, humidity, and CO₂, transmitting data wirelessly via UART-to-LoRa bridge. IC Role / Device Role / Timing Role: Central sensor hub managing ADC reads, calibration math, sleep/wake cycles, and UART framing for upstream radio interface. Use Value: Power-down mode with external interrupt wake-up extends battery life; 3 V operation matches Li-ion/Li-SOCl₂ cells; ISP enables remote firmware updates after deployment. |
| Legacy Equipment Retrofit Controller | Embedded Test Instrument |
Use Scenario: Drop-in replacement for obsolete 8051-based controllers in medical infusion pumps, replacing EPROM with reprogrammable flash and adding safety monitoring. IC Role / Device Role / Timing Role: Safety-critical motion and valve control unit with watchdog supervision, brownout reset, and dual-redundant timer validation of motor step timing. Use Value: Pin-compatible upgrade path preserves PCB layout; brownout detection at 2.35 V prevents erratic behavior during power sag; IAP allows post-manufacture calibration storage in flash. | Use Scenario: Portable handheld tester for verifying analog sensor outputs, performing auto-ranging measurements, and logging results to SD card via SPI. IC Role / Device Role / Timing Role: Main processor handling SPI SD card interface, UART PC communication, LCD refresh, button scan, and ADC sampling control. Use Value: SPI peripheral enables fast SD card writes; enhanced UART supports hardware flow control for reliable PC sync; 1 kB RAM suffices for buffer + stack in single-threaded measurement loop. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 8-bit microcontroller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT89C51RC2-UM | 512 B RAM, 32 kB flash, no X2 mode, 5 V operation only | Lacks 6-clock mode and brownout detection; incompatible voltage range limits use in 3 V systems | Select only if 5 V supply and absence of low-EMI features are acceptable |
| P89V51RD2FA | Same core and peripherals but PLCC44 package and −40 °C to +85 °C rating | Identical functionality with extended temperature range and different package footprint | Choose for industrial environments requiring wider thermal tolerance and through-hole assembly |
Compared with AT89C51RC2-UM and P89V51RD2FA, the P89LV51RD2BBC offers unique 3 V operation with X2 mode for EMI-sensitive designs, while retaining full 80C51 compatibility - making it optimal for cost-constrained, space-limited commercial equipment where thermal margin and voltage headroom are moderate.
Availability
P89LV51RD2BBC is available at Aetrix Electronics and suitable for industrial control, sensor interface, and embedded instrumentation applications requiring stable component supply, long-term lifecycle support, and consistent flash programming toolchain compatibility.
Supply support for P89LV51RD2BBC 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
NXP Semiconductors is a global semiconductor company headquartered in Eindhoven, Netherlands, specializing in secure connectivity solutions for automotive, industrial, and IoT markets.
The P89LV51RD2BBC belongs to NXP's legacy 80C51 microcontroller family, designed to provide drop-in upgrade paths for legacy 8051 systems with enhanced flash density, ISP/IAP, and low-voltage operation - targeting cost-sensitive embedded applications where toolchain familiarity and design reuse are critical.
FAQ
What is the maximum operating frequency of the P89LV51RD2BBC?
The P89LV51RD2BBC supports operation up to 33 MHz at 3 V supply. Its 6-clock (X2) mode delivers effective instruction throughput equivalent to a 66 MHz 12-clock 80C51, but the actual crystal or oscillator input must not exceed 33 MHz. Frequency selection is confirmed in Table 2 of the NXP datasheet Rev. 05.
Does the P89LV51RD2BBC support in-application programming (IAP)?
Yes, the P89LV51RD2BBC supports IAP, allowing flash memory to be reconfigured while the application is running. This capability is implemented via dedicated ISP/IAP routines in Block 1 flash and controlled by SWR/BSEL bits in the FCF register. The P89LV51RD2BBC datasheet Section 6.2.1 confirms IAP enables dynamic firmware updates without halting core execution.
What package type is used for the P89LV51RD2BBC?
The P89LV51RD2BBC uses a TQFP44 package (SOT376-1): plastic thin quad flat package with 44 leads, 10 × 10 × 1.0 mm body size. This surface-mount package is distinct from the PLCC44 variant (e.g., P89LV51RD2FA) and requires corresponding PCB land pattern per NXP's recommended footprint.
How does the X2 mode affect ALE signal behavior on the P89LV51RD2BBC?
In X2 (6-clock) mode, the ALE signal on the P89LV51RD2BBC is emitted at one-third the crystal frequency instead of the default one-sixth. This higher ALE rate supports faster external memory access timing but increases EMI; ALE can be fully inhibited via the AO bit for lowest noise operation. Confirmed in Table 3 footnote [2] of the datasheet.
What is the brownout detection threshold voltage for the P89LV51RD2BBC?
The P89LV51RD2BBC features a fixed brownout detection threshold of 2.35 V. When VDD drops below this level, the device generates a brownout interrupt (if enabled via EBO bit) or performs a hardware reset. The P89LV51RD2BBC datasheet Section 6.2.4 specifies this value and notes that the BSEL bit is cleared during brownout reset while SWR remains unchanged.
P89LV51RD2BBC,557 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Package/Case:
- 44-TQFP
- Series:
- 89LV
- Packaging:
- Tray
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Core Processor:
- 8051
- Core Size:
- 8-Bit
- Speed:
- 33MHz
- Connectivity:
- SPI, UART/USART
- Peripherals:
- Brown-out Detect/Reset, POR, PWM, WDT
- Number of I/O:
- 32
- Program Memory Size:
- 64KB (64K x 8)
- Program Memory Type:
- FLASH
- EEPROM Size:
- -
- RAM Size:
- 1K x 8
- Voltage - Supply (Vcc/Vdd):
- 2.7V ~ 3.6V
- Data Converters:
- -
- Oscillator Type:
- Internal
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
P89LV51RD2BBC,557 FAQ
1.How can I place an order for P89LV51RD2BBC,557 through Aetrix?
Please submit a Request for Quotation (RFQ) for P89LV51RD2BBC,557 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 P89LV51RD2BBC,557 reliable?
The price and inventory of P89LV51RD2BBC,557 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for P89LV51RD2BBC,557 is usually 5 days.
3.What payment methods are accepted for P89LV51RD2BBC,557?
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Once your P89LV51RD2BBC,557 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 P89LV51RD2BBC,557?
For technical support, including P89LV51RD2BBC,557 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your P89LV51RD2BBC,557 requirements.
6.How does Aetrix verify that P89LV51RD2BBC,557 is sourced from the original manufacturer or authorized distributors?
All P89LV51RD2BBC,557 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 P89LV51RD2BBC,557 meets industry standards.
7.What is the process for return or replacement of P89LV51RD2BBC,557?
All P89LV51RD2BBC,557 units undergo pre-shipment inspection (PSI). If there is an issue with P89LV51RD2BBC,557, 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 P89LV51RD2BBC,557 part is unused and in its original packaging.
Return procedure for P89LV51RD2BBC,557:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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