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NXP Semiconductors P89LV51RB2BBC,557
- Part No.:
- P89LV51RB2BBC,557
- Manufacturer:
- NXP Semiconductors
- Category:
- Microcontrollers
- Package:
- 44-TQFP
- Datasheet:
-
P89LV51RB2BBC,557.pdf
- Description:
- IC MCU 8BIT 16KB FLASH 44TQFP
- Quantity:
- Payment:
- Shipping:
Inventory:1,690
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Product details
Overview
P89LV51RB2BBC,557 from NXP Semiconductors is an 8-bit 80C51 microcontroller with 16 kB flash program memory, 1 kB on-chip RAM, 3 V operation (0–33 MHz), X2 mode for doubled throughput at same clock frequency, and TQFP44 package. It integrates SPI, enhanced UART, PCA with PWM/capture/compare, three 16-bit timers, and programmable watchdog - deployed in industrial control panels requiring field-upgradable firmware via ISP.
For engineers reviewing the P89LV51RB2BBC,557 datasheet, P89LV51RB2BBC,557 pinout, P89LV51RB2BBC,557 application, or P89LV51RB2BBC,557 equivalent, key selection criteria include 3 V low-power operation, 6-clock/X2 mode configurability, IAP capability during runtime, TQFP44 footprint compatibility, and brownout detection at 2.35 V.
Technical Context
The P89LV51RB2BBC,557 implements a standard 80C51 CPU core with dual clock modes: default 12-clock-per-machine-cycle and selectable 6-clock mode enabled via software or ISP, enabling either 2× performance at identical crystal frequency or halved EMI by reducing clock frequency while maintaining throughput. Its memory architecture separates 16 kB flash (Block 0) and dedicated ISP/IAP routines (Block 1), with bank selection controlled by SWR and BSEL bits in FCF register.
It supports in-system programming (ISP) and in-application programming (IAP), allowing firmware updates without removing the device. The PCA module provides five independent capture/compare channels (CEX0–CEX4) mapped to Port 1 pins, each configurable for PWM, edge-triggered capture, or software-timed compare - all accessible via bit-addressable SFRs including CCAPMn and CCON.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Core Architecture | 80C51 8-bit CPU with dual clock mode (12- or 6-clock per machine cycle) |
| Flash Memory | 16 kB user code flash with ISP/IAP support; enables field firmware updates without hardware reprogramming |
| RAM | 1024 B on-chip data RAM, including 768 B expanded RAM accessible via MOVX when EXTRAM=0 |
| Operating Voltage | 3 V supply, functional from 0 MHz to 33 MHz - suitable for low-noise, battery-sensitive embedded systems |
| Temperature Range | 0 °C to +70 °C - validated for commercial and industrial indoor control applications |
| Package | TQFP44 (SOT376-1), 10 × 10 × 1.0 mm body - compatible with standard 0.8 mm pitch PCB assembly |
| Brownout Detection | Fixed 2.35 V threshold with interrupt/reset option - prevents erratic execution during power sag |
Pinout & Package
Package: TQFP44 (SOT376-1), plastic thin quad flat package, 44 leads, 10 × 10 × 1.0 mm body.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| P0.0/AD0 (37) | Port 0 bit 0 / Address-data bit 0 | Open-drain bidirectional I/O; multiplexed low-order address/data bus for external memory access |
| P1.5/MOSI/CEX2 (1) | Port 1 bit 5 / SPI master output / PCA channel 2 I/O | Configurable as SPI data output or PCA capture/compare pin; supports 16 mA high-current drive |
| P2.7/A15 (25) | Port 2 bit 7 / Address bit 15 | High-order address output during external memory fetches; internal pull-up enabled in address mode |
| P3.0/RXD (5) | Port 3 bit 0 / Serial receive input | Asynchronous serial input for UART; supports full-duplex communication with framing error detection |
| RST (4) | Reset input | Active-HIGH reset requiring ≥2 machine cycles; also triggers external host mode when pulsed with PSEN |
| EA (29) | External access enable | Strapped HIGH for internal flash execution; tied LOW to enable external program memory fetches |
| ALE/PROG (27) | Address latch enable / Flash programming pulse | Outputs address latch strobe at 1/6 crystal frequency (1/3 in X2 mode); doubles as PROG signal for flash write |
Key Features
| Feature | Design Value |
|---|---|
| X2 mode selection | Software- or ISP-configurable 6-clock-per-cycle operation - doubles instruction throughput or halves EMI without changing crystal |
| In-application programming (IAP) | Reprogram flash memory while application runs - enables dynamic firmware patching and secure OTA-like updates |
| Programmable counter array (PCA) | Five independent capture/compare modules (CEX0–CEX4) with PWM, edge-capture, and software-timed compare modes |
| Low-EMI operation | ALE inhibit and X2 mode reduce radiated emissions - simplifies EMC compliance for industrial sensor nodes |
| Brownout detection | Hardware reset/interrupt at 2.35 V - prevents corrupted flash writes and undefined state during undervoltage events |
Applications
| Industrial HMI Panel | Smart Energy Meter |
|---|---|
Use Scenario: Local display, button interface, and RS-485 communication in DIN-rail mounted control panels. IC Role / Device Role / Timing Role: Main controller executing real-time UI logic, managing SPI-driven LCD, and handling UART-based Modbus RTU protocol. Use Value: X2 mode ensures responsive UI rendering at 33 MHz while staying within 3 V supply constraints; IAP allows remote firmware patches without panel disassembly. |
Use Scenario: Residential electricity meter with pulse counting, tamper detection, and infrared/RS-485 data upload. IC Role / Device Role / Timing Role: System-on-chip managing metrology interface, EEPROM logging, and secure bootloader verification. Use Value: Brownout detection prevents flash corruption during grid voltage sags; 16 mA Port 1 pins directly drive opto-isolators for pulse output signaling. |
| PLC I/O Module | Building Automation Controller |
Use Scenario: Compact 8-channel digital input/output expansion module for modular PLC systems. IC Role / Device Role / Timing Role: Peripheral controller interfacing with isolation barriers, reading status inputs, and driving relay drivers via Port 0/2. Use Value: Three 16-bit timers provide precise timing for input debouncing and output pulse-width modulation; TQFP44 footprint fits dense PCB layouts. |
Use Scenario: HVAC zone controller with temperature sensing, fan speed regulation, and BACnet MS/TP communication. IC Role / Device Role / Timing Role: Real-time coordinator managing ADC sampling, PCA-based fan PWM, and UART-to-BACnet gateway logic. Use Value: PCA's five CEX channels independently manage four fan speeds and one valve actuator; SPI connects to external flash for configuration storage. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 80C51 microcontroller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT89C51RC2-UM | 16 kB flash, 1 kB RAM, 5 V operation, PLCC44 only - no X2 mode or IAP | Lacks runtime reprogramming and low-voltage operation; requires level-shifting for 3 V systems | Select only if legacy 5 V design and absence of field updates are acceptable |
| P89V51RD2BBC,557 | 64 kB flash, same 3 V/0–33 MHz spec, identical TQFP44 pinout and SFR map - differs only in flash size | Direct drop-in replacement where larger firmware image size is required | Choose when application firmware exceeds 16 kB but retains identical peripheral usage and timing requirements |
Compared with AT89C51RC2-UM, P89LV51RB2BBC,557 offers 3 V operation and IAP; compared with P89V51RD2BBC,557, it reduces flash capacity to 16 kB while retaining identical timing, peripherals, and pin compatibility - optimizing cost and code density for smaller firmware footprints.
Availability
P89LV51RB2BBC,557 is available at Aetrix Electronics and suitable for industrial HMI panels, smart energy meters, and PLC I/O modules requiring stable component supply, long-term lifecycle support, and verified 3 V low-power operation.
Supply support for P89LV51RB2BBC,557 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 leader focused on secure connectivity solutions for automotive, industrial, and IoT applications.
The P89LV51RB2BBC,557 belongs to NXP's legacy 80C51 microcontroller family, designed for cost-sensitive, reliability-critical embedded control applications requiring field-upgradability and low-voltage operation.
FAQ
What is the maximum operating frequency of the P89LV51RB2BBC,557?
The P89LV51RB2BBC,557 operates up to 33 MHz at 3 V supply. In standard 12-clock mode, this yields 2.75 MIPS; in X2 (6-clock) mode, it achieves 5.5 MIPS. Frequency validation includes full functionality across the 0–33 MHz range with stable 3 V supply and proper decoupling - no derating required.
Does the P89LV51RB2BBC,557 support in-system programming (ISP)?
Yes, the P89LV51RB2BBC,557 supports ISP via its enhanced UART using standard baud rates (e.g., 9600 or 115200 bps). The boot code automatically attempts autobaud detection for ~400 ms after reset; successful handshake enters ISP mode, enabling flash erase/write/verify without external programmers.
How does the X2 mode affect ALE signal timing on the P89LV51RB2BBC,557?
In X2 mode, the ALE signal on the P89LV51RB2BBC,557 emits at 1/3 of the crystal frequency instead of the default 1/6. This higher ALE rate maintains correct address latching timing for external memory interfaces while enabling faster instruction execution - critical for systems using external RAM or peripherals synchronized to ALE.
Can the P89LV51RB2BBC,557 execute code from external memory?
Yes, the P89LV51RB2BBC,557 can execute from external program memory when EA is tied LOW. Port 0 provides multiplexed AD0–AD7, Port 2 supplies A8–A15, and P3.6/P3.7 generate WR/RD strobes. External code space is limited to 64 kB, and external access requires proper wait-state configuration via SFRs.
What is the function of the EXTRAM bit in the AUXR register for the P89LV51RB2BBC,557?
The EXTRAM bit (AUXR.0) controls access to the 768 B expanded RAM. When cleared (EXTRAM = 0), MOVX instructions target on-chip expanded RAM (000H–2FFH); when set, MOVX accesses external data memory. This enables efficient use of internal RAM without consuming Port 0/2 resources for external bus emulation.
P89LV51RB2BBC,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:
- 16KB (16K x 8)
- Program Memory Type:
- FLASH
- EEPROM Size:
- -
- RAM Size:
- 512 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:
P89LV51RB2BBC,557 FAQ
1.How can I place an order for P89LV51RB2BBC,557 through Aetrix?
Please submit a Request for Quotation (RFQ) for P89LV51RB2BBC,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 P89LV51RB2BBC,557 reliable?
The price and inventory of P89LV51RB2BBC,557 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for P89LV51RB2BBC,557 is usually 5 days.
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P89LV51RB2BBC,557 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your P89LV51RB2BBC,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 P89LV51RB2BBC,557?
For technical support, including P89LV51RB2BBC,557 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your P89LV51RB2BBC,557 requirements.
6.How does Aetrix verify that P89LV51RB2BBC,557 is sourced from the original manufacturer or authorized distributors?
All P89LV51RB2BBC,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 P89LV51RB2BBC,557 meets industry standards.
7.What is the process for return or replacement of P89LV51RB2BBC,557?
All P89LV51RB2BBC,557 units undergo pre-shipment inspection (PSI). If there is an issue with P89LV51RB2BBC,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 P89LV51RB2BBC,557 part is unused and in its original packaging.
Return procedure for P89LV51RB2BBC,557:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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