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NXP Semiconductors P89LV51RD2BA,512
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- Part No.:
- P89LV51RD2BA,512
- Manufacturer:
- NXP Semiconductors
- Category:
- Microcontrollers
- Package:
- 44-LCC (J-Lead)
- Datasheet:
-
P89LV51RD2BA,512.pdf
- Description:
- IC MCU 8BIT 64KB FLASH 44PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:4,719
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Product details
Overview
P89LV51RD2BA,512 from NXP Semiconductors is an 8-bit 80C51 microcontroller with 64 kB on-chip flash program memory, 1 kB data RAM, 3 V operation (0–33 MHz), X2 mode (6-clock per machine cycle), and in-system programmability (ISP/IAP). It serves as a low-power embedded controller in industrial control panels, legacy protocol gateways, and sensor interface modules requiring field firmware updates.
For engineers reviewing the P89LV51RD2BA,512 datasheet, P89LV51RD2BA,512 pinout, P89LV51RD2BA,512 application, or P89LV51RD2BA,512 equivalent, key selection criteria include flash size (64 kB), PLCC44 package compatibility, X2 mode throughput doubling, brownout detection at 2.35 V, and dual DPTR support for efficient external memory access.
Technical Context
The P89LV51RD2BA,512 implements a standard 80C51 CPU core with extended peripherals including a Programmable Counter Array (PCA) with five capture/compare modules, enhanced UART with framing error detection, and SPI interface. Its memory architecture separates 64 kB flash (organized in 512 × 128 B sectors) and 1 kB RAM, with bank-selectable ISP/IAP routines in Block 1.
It supports two clock modes: default 12-clock and selectable 6-clock (X2) via software or ISP, enabling either doubled instruction throughput at same frequency or halved EMI by reducing crystal frequency. Brownout detection (2.35 V threshold), programmable watchdog timer, and four priority-level interrupts provide robust system supervision.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Core Architecture | 80C51 CPU with dual DPTR register for efficient external memory addressing |
| Flash Memory | 64 kB user code flash with ISP and IAP - enables field firmware updates without removing device |
| Clock Modes | Software-selectable 12-clock (default) or 6-clock (X2) - doubles throughput or halves EMI |
| Operating Voltage | 3 V ±10 % (2.7–3.6 V) - compatible with modern low-voltage logic and battery-backed systems |
| RAM Size | 1024 B on-chip data RAM with expanded 768 B indirectly addressable via MOVX + EXTRAM bit |
| Peripherals | SPI, enhanced UART, PCA with 5 capture/compare channels, three 16-bit timers, programmable WDT |
| Interrupt System | Eight sources with four priority levels - supports nested real-time task handling |
Pinout & Package
Package: PLCC44 (SOT187-2), plastic leaded chip carrier, 44-pin, body size 16.6 × 16.6 × 4.0 mm.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| P0.0/AD0 – P0.7/AD7 | Port 0 bidirectional I/O / multiplexed address/data bus | Open-drain outputs require external pull-ups; used for external memory access and general I/O |
| P1.0/T2 – P1.7/SPICLK/CEX4 | Port 1 with high-current drive (16 mA on P1.5–P1.7) | Supports SPI master/slave, PCA I/O, Timer2 I/O, and general-purpose digital control |
| P2.0/A8 – P2.7/A15 | Port 2 bidirectional I/O / high-order address bus | Provides A8–A15 during external memory accesses; internal pull-ups enable direct use as GPIO |
| P3.0/RXD – P3.7/RD | Port 3 with alternate functions | UART I/O, external interrupts INT0/INT1, Timer0/1 inputs, external memory read/write strobes |
| RST | Active-high reset input | Two-machine-cycle HIGH pulse initiates hardware reset; also enters external host programming mode when combined with PSEN |
| EA | External Access Enable | Strapped to VDD for internal flash execution; tied to VSS to fetch code from external memory |
| ALE/PROG | Address Latch Enable / programming pulse | Latches P0 address bits during external memory access; serves as PROG signal for flash programming |
| XTAL1/XTAL2 | Crystal oscillator inputs | Supports quartz crystals or ceramic resonators up to 40 MHz; internal oscillator circuit eliminates need for external clock source |
Key Features
| Feature | Design Value |
|---|---|
| X2 Mode Clock Architecture | Enables 6-clock-per-machine-cycle operation - delivers 2× instruction throughput at same crystal frequency or cuts EMI by 50 % via halved clock rate |
| In-System Programming (ISP) | Allows reprogramming via UART under software control - eliminates socket programming and enables remote firmware updates |
| In-Application Programming (IAP) | Permits flash reconfiguration while application runs - supports dynamic parameter storage, bootloader updates, and self-modifying code |
| Programmable Brownout Detection | Fixed 2.35 V threshold with interrupt/reset option - prevents erratic operation during supply sag without external supervisor IC |
| Low-EMI Operation | ALE inhibit and X2 mode reduce radiated emissions - simplifies EMC compliance in industrial and medical equipment |
| Enhanced Peripheral Set | SPI, PCA (5-channel), dual UART buffers, and second DPTR - reduces need for external glue logic in protocol translation and motor control |
Applications
| Industrial Control Panel | Legacy Protocol Gateway |
|---|---|
Use Scenario: Standalone HMI panel managing relay banks, analog sensor inputs, and status LEDs in factory automation cabinets. IC Role / Device Role / Timing Role: Primary controller executing ladder logic interpreter and serial protocol handlers (Modbus RTU over RS-485). Use Value: 64 kB flash stores full interpreter + configuration tables; X2 mode ensures deterministic 10 ms scan cycle at 22.1184 MHz crystal; PCA channels generate precise PWM for LED dimming. |
Use Scenario: Field-deployed bridge converting RS-232-based legacy instrumentation (e.g., older flow meters) to Ethernet/IP or CANopen networks. IC Role / Device Role / Timing Role: Protocol translation engine with UART-to-SPI bridging and packet buffering in 1 kB RAM. Use Value: ISP allows firmware patching post-deployment; dual DPTR enables concurrent access to UART RX buffer and Ethernet descriptor table; brownout detection prevents corruption during power glitches. |
| Sensor Interface Module | Embedded Power Monitor |
Use Scenario: DIN-rail mounted module acquiring temperature, humidity, and voltage readings from analog sensors and reporting via Modbus ASCII. IC Role / Device Role / Timing Role: Data acquisition controller with ADC interfacing (via P0.x), timing-critical sampling, and serial communication stack. Use Value: 1 kB RAM accommodates multiple sensor buffers and Modbus frame assembly; enhanced UART supports framing error detection for noise-prone industrial wiring. |
Use Scenario: Compact AC/DC power supply monitor logging RMS voltage, current harmonics, and thermal alerts using isolated analog front-end. IC Role / Device Role / Timing Role: Real-time supervisor coordinating ADC sampling, watchdog resets, and nonvolatile event logging to flash. Use Value: IAP enables safe firmware updates without losing calibration constants stored in reserved flash sectors; programmable WDT ensures recovery from ADC lockup. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 8051-based microcontroller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT89C51ED2-RL24 | 512 B RAM, 64 kB flash, 3 V operation, but no X2 mode; uses different ISP protocol and lacks PCA | Less suitable for time-critical PWM or high-throughput serial bridging due to fixed 12-clock timing | Select only if X2 mode and PCA are unnecessary and Atmel toolchain compatibility is required |
| STC89C52RC-PD | 8 kB flash, 512 B RAM, 5 V operation, single DPTR, no brownout detection, lower max frequency (33 MHz vs 40 MHz) | Targeted at cost-sensitive consumer electronics, not industrial environments requiring 3 V operation or brownout resilience | Choose only for low-cost replacements where flash size, voltage, and supervision features are not critical |
Compared with AT89C51ED2-RL24 and STC89C52RC-PD, the P89LV51RD2BA,512 offers superior real-time capability via X2 mode and PCA, higher RAM density, and integrated brownout protection - making it the preferred choice for industrial firmware-upgradable systems demanding deterministic timing and robustness.
Availability
P89LV51RD2BA,512 is available at Aetrix Electronics and suitable for industrial control panels, legacy protocol gateways, and sensor interface modules requiring stable component supply across extended product lifecycles.
Supply support for P89LV51RD2BA,512 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 P89LV51RD2BA,512 belongs to NXP's legacy 80C51 microcontroller family, designed specifically for cost-effective, field-upgradable embedded control in industrial automation and infrastructure equipment where long-term availability and proven reliability are essential.
FAQ
What is the maximum operating frequency of the P89LV51RD2BA,512?
The P89LV51RD2BA,512 supports frequencies up to 40 MHz in standard operation, with guaranteed performance from 0 MHz to 33 MHz at 3 V. When using X2 mode, the effective instruction throughput doubles at the same crystal frequency - for example, a 22.1184 MHz crystal delivers performance equivalent to a 44.2368 MHz 12-clock device. The device's oscillator circuit is fully static, allowing operation at DC for ultra-low-power idle states.
Does the P89LV51RD2BA,512 support in-application programming (IAP)?
Yes, the P89LV51RD2BA,512 supports true in-application programming (IAP), allowing flash memory to be rewritten while the main application continues executing. This capability relies on dedicated ISP/IAP firmware in Block 1 of flash and requires proper banking control via SWR and BSEL bits in FCF register. IAP enables dynamic parameter storage, bootloader updates, and secure firmware patches without halting system operation.
What package type does the P89LV51RD2BA,512 use?
The P89LV51RD2BA,512 uses a PLCC44 (plastic leaded chip carrier) package, designated SOT187-2, with 44 leads and dimensions of 16.6 × 16.6 × 4.0 mm. Pinout matches the standard 80C51 layout with added functions on Port 1 (SPI, PCA) and Port 3 (external memory controls). This package is socket-compatible with legacy 8051 development fixtures and supports reflow or wave soldering.
How does the X2 mode affect power consumption and EMI in the P89LV51RD2BA,512?
In X2 mode, the P89LV51RD2BA,512 executes instructions in six clock cycles instead of twelve, enabling either double throughput at the same frequency or halving the crystal frequency to maintain performance - which directly reduces switching-related EMI by ~50 %. Power consumption scales linearly with frequency, so running at 22 MHz in X2 mode draws comparable current to 44 MHz in 12-clock mode, but with significantly lower radiated emissions - critical for CE/FCC compliance in industrial enclosures.
What is the brownout detection threshold for the P89LV51RD2BA,512?
The P89LV51RD2BA,512 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 forces a reset to prevent corrupted flash writes or erratic program flow. The BSEL bit is cleared during brownout reset, ensuring boot code mapping is restored - a safeguard against partial firmware corruption during supply instability.
P89LV51RD2BA,512 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Package/Case:
- 44-LCC (J-Lead)
- Series:
- 89LV
- Packaging:
- Tube
- 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:
P89LV51RD2BA,512 FAQ
1.How can I place an order for P89LV51RD2BA,512 through Aetrix?
Please submit a Request for Quotation (RFQ) for P89LV51RD2BA,512 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 P89LV51RD2BA,512 reliable?
The price and inventory of P89LV51RD2BA,512 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for P89LV51RD2BA,512 is usually 5 days.
3.What payment methods are accepted for P89LV51RD2BA,512?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for P89LV51RD2BA,512 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for P89LV51RD2BA,512?
P89LV51RD2BA,512 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your P89LV51RD2BA,512 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 P89LV51RD2BA,512?
For technical support, including P89LV51RD2BA,512 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your P89LV51RD2BA,512 requirements.
6.How does Aetrix verify that P89LV51RD2BA,512 is sourced from the original manufacturer or authorized distributors?
All P89LV51RD2BA,512 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 P89LV51RD2BA,512 meets industry standards.
7.What is the process for return or replacement of P89LV51RD2BA,512?
All P89LV51RD2BA,512 units undergo pre-shipment inspection (PSI). If there is an issue with P89LV51RD2BA,512, 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 P89LV51RD2BA,512 part is unused and in its original packaging.
Return procedure for P89LV51RD2BA,512:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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