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NXP Semiconductors P87C51RB2BA,512
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- Part No.:
- P87C51RB2BA,512
- Manufacturer:
- NXP Semiconductors
- Category:
- Microcontrollers
- Package:
- 44-LCC (J-Lead)
- Datasheet:
-
P87C51RB2BA,512.pdf
- Description:
- IC MCU 8BIT 16KB OTP 44PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:3,905
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Product details
Overview
P87C51RB2BA,512 from NXP Semiconductors (formerly Philips) is an 8-bit OTP microcontroller based on the 80C51 architecture, featuring 16 KB on-chip OTP program memory, 512 bytes of RAM, 32 I/O pins, three 16-bit timers (T0/T1/T2), a full-duplex enhanced UART with framing error detection, and a programmable counter array (PCA) supporting PWM and capture/compare functions. It operates from 2.7 V to 5.5 V at up to 33 MHz in 12-clock mode and targets motor control, industrial automation, and embedded instrumentation.
For engineers reviewing the P87C51RB2BA,512 datasheet, P87C51RB2BA,512 pinout, P87C51RB2BA,512 application, or P87C51RB2BA,512 equivalent, key selection criteria include its 16 KB OTP capacity, 512-byte RAM, 6-/12-clock mode flexibility, PCA-based PWM capability, and PLCC-44 package compatibility with legacy 80C51 toolchains and PCB footprints.
Technical Context
The P87C51RB2BA,512 implements an accelerated 80C51 CPU core with fully static operation and dual clock modes-software-selectable 6-clock (up to 30 MHz) or factory-default 12-clock (up to 33 MHz)-enabling performance scaling without hardware change. Its instruction set is 100% compatible with standard 80C51 code.
It integrates four 8-bit bidirectional I/O ports (P0–P3), each with internal pull-ups and configurable alternate functions: Port 1 supports five PCA channels (CEX0–CEX4), Timer 2 external inputs (T2/T2EX), and ECI; Port 3 provides UART (RxD/TxD), external interrupts (INT0/INT1), timer inputs (T0/T1), and memory control (WR/RD).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Core Architecture | 80C51-compatible 8-bit CPU with Boolean processor and 100% instruction set compatibility |
| OTP Memory | 16 KB on-chip one-time-programmable ROM for firmware storage; no reprogramming capability |
| RAM | 512 bytes on-chip data RAM; expandable externally to 64 KB via MOVX instructions |
| Max Clock Frequency | 33 MHz at 5 V in 12-clock mode; 30 MHz in 6-clock mode; supports 0–16 MHz range at 3 V |
| I/O Pins | 32 configurable bidirectional I/O lines across Ports 0–3, with port-specific alternate functions |
| Timers & Counters | Three 16-bit timers/counters (T0, T1, T2); T2 supports capture, compare, reload, and baud-rate generation |
| PCA Module | Programmable Counter Array with five independent modules (CEX0–CEX4) for PWM, input capture, and software timers |
| Power Supply | 2.7 V to 5.5 V operation; supports low-voltage industrial and battery-backed applications |
Pinout & Package
Package: Plastic Leaded Chip Carrier (PLCC), 44-pin, SOT187-2 footprint, with lead-free finish and operating temperature range of 0 °C to +70 °C.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| P0.0–P0.7 | Port 0 bidirectional I/O / AD0–AD7 | Open-drain port used as multiplexed address/data bus for external memory access; requires external pull-ups for general I/O |
| P1.0–P1.7 | Port 1 bidirectional I/O | Internal pull-up port with PCA and Timer 2 alternate functions: T2, T2EX, ECI, CEX0–CEX4 |
| P2.0–P2.7 | Port 2 bidirectional I/O / A8–A15 | High-order address bus during 16-bit external memory access; emits P2 register value during 8-bit MOVX |
| P3.0–P3.7 | Port 3 bidirectional I/O | Dedicated serial (RxD/TxD), interrupt (INT0/INT1), timer (T0/T1), and memory control (WR/RD) functions |
| RST | Reset input | Active-high reset requiring ≥2 machine cycles (12/24 oscillator periods); enables power-on reset with RC network |
| XTAL1/XTAL2 | Oscillator input/output | Supports crystal (1–24 MHz) or external clock source; XTAL2 unconnected when using external clock |
| EA/VPP | External Access Enable / Programming Voltage | High = execute from internal OTP; low = fetch from external program memory; VPP = 12.75 V during parallel programming |
| ALE/PROG | Address Latch Enable / Programming Pulse | Outputs address latch pulse during external memory access; disabled via SFR bit auxiliary.0 for timing-critical applications |
Key Features
| Feature | Design Value |
|---|---|
| 6-/12-clock mode selection | Software-configurable via CKCON.X2 or OTP bit OX2-enables 2× throughput vs. standard 80C51 without changing code or clocks |
| Programmable Counter Array (PCA) | Five independent 16-bit modules support simultaneous PWM generation, edge-triggered input capture, and software timers with auto-reload |
| Enhanced UART | Full-duplex with framing error detection, automatic address recognition, and variable baud rates using Timer 1 or Timer 2 |
| Low-power operation | Idle and Power-Down modes reduce current consumption; wake-up from Power-Down via INT0/INT1 level-sensitive interrupts |
| Security and protection | Three programmable security bits and 64-byte encryption array prevent unauthorized firmware read-out and cloning |
| Extended interrupt system | Seven interrupt sources with four priority levels and nested interrupt handling-supports real-time response in multi-tasking environments |
Applications
| Motor Control System | Industrial PLC I/O Module |
|---|---|
Use Scenario: Closed-loop speed and position control of DC/BLDC motors using PWM-driven H-bridge drivers and quadrature encoder feedback. IC Role / Device Role / Timing Role: Primary controller executing PID algorithms, generating synchronized PWM outputs via PCA, and processing encoder pulses on CEX inputs. Use Value: Integrated PCA eliminates external PWM ICs; 32 I/O pins simplify interface to drivers, sensors, and status LEDs; 16 KB OTP accommodates complex motion profiles. | Use Scenario: Standalone digital I/O expansion node in distributed control systems, monitoring field sensors and driving solenoids/relays. IC Role / Device Role / Timing Role: Real-time I/O manager with deterministic scan cycle timing, UART-based Modbus RTU communication, and watchdog supervision. Use Value: Full-duplex UART with framing error detection ensures robust serial comms; 512-byte RAM buffers Modbus packets; low-voltage operation supports 3.3 V/5 V mixed-rail designs. |
| Embedded Instrumentation Panel | Legacy Equipment Upgrade Controller |
Use Scenario: Front-panel controller for test equipment, managing LCD display, keypad input, calibration EEPROM, and analog front-end SPI interface. IC Role / Device Role / Timing Role: System coordinator handling user interface, nonvolatile configuration storage, and timing-critical ADC sampling triggers via Timer 2. Use Value: Dual data pointers enable efficient LCD buffer management; 16 KB OTP stores UI firmware and calibration tables; PLCC-44 package fits existing through-hole layouts. | Use Scenario: Drop-in replacement for obsolete 8051 variants in aging medical or telecom equipment where PCB redesign is prohibited. IC Role / Device Role / Timing Role: Pin- and code-compatible upgrade delivering higher clock speed, larger memory, and enhanced peripherals without layout changes. Use Value: 100% 80C51 instruction compatibility ensures zero firmware modification; same PLCC-44 footprint and voltage range (2.7–5.5 V) guarantee mechanical and electrical interoperability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 8-bit microcontroller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT89C51RC2-24PU | 16 KB Flash (reprogrammable), 512 B RAM, 24 MHz max, DIP-40 package | Lacks PCA and enhanced UART; no 6-clock mode; lower max frequency | Choose for prototyping or field-upgradable firmware where Flash reprogramming is required and PCA is not needed. |
| P89V51RD2FA | 64 KB Flash, 1 KB RAM, 40 MHz max, PLCC-44, includes ISP and USB bootloader | Higher memory, faster clock, Flash-based, but different SFR map and boot process | Choose for new designs needing field firmware updates and extended memory; requires firmware adaptation due to SFR differences. |
Compared with AT89C51RC2-24PU and P89V51RD2FA, the P87C51RB2BA,512 offers OTP security and PCA-based PWM out-of-the-box for cost-sensitive production units, while avoiding Flash wear-out concerns and retaining full 80C51 toolchain compatibility without SFR migration effort.
Availability
P87C51RB2BA,512 is available at Aetrix Electronics and suitable for motor control, industrial PLC I/O modules, and embedded instrumentation panels requiring stable component supply, long-term obsolescence management, and legacy 80C51 ecosystem compatibility.
Supply support for P87C51RB2BA,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 leader delivering high-performance, energy-efficient solutions for automotive, industrial, and IoT applications.
The P87C51RB2BA,512 belongs to NXP's legacy 80C51 family, designed specifically to extend the life of 8051-based systems with enhanced peripherals, wider voltage range, and OTP security-targeting industrial control, instrumentation, and cost-sensitive embedded upgrades.
FAQ
What is the maximum operating frequency of the P87C51RB2BA,512?
The P87C51RB2BA,512 supports up to 33 MHz in 12-clock mode and 30 MHz in 6-clock mode at VCC = 5 V. At 3 V, the usable frequency range is 0–16 MHz. The device is factory-configured for 12-clock operation but can be switched to 6-clock mode via software (CKCON.X2) or parallel programming (OTP bit OX2), effectively doubling instruction throughput versus standard 80C51 cores. This makes the P87C51RB2BA,512 suitable for time-critical tasks like motor commutation and real-time I/O scanning.
Does the P87C51RB2BA,512 support in-system programming (ISP)?
No, the P87C51RB2BA,512 uses one-time-programmable (OTP) memory and does not support in-system programming. Firmware must be programmed using a parallel programmer compatible with the 87C51 interface before soldering. Unlike Flash-based alternatives such as the P89V51RD2, the P87C51RB2BA,512 prioritizes code security and production stability over field reprogrammability. This design choice prevents unauthorized firmware modification and ensures consistent behavior across deployed units.
What package type and pin count does the P87C51RB2BA,512 use?
The P87C51RB2BA,512 is supplied in a 44-pin Plastic Leaded Chip Carrier (PLCC) package, SOT187-2 footprint, with operating temperature range 0 °C to +70 °C. It is pin-compatible with other members of the P87C51RA2/RB2/RC2/RD2 family in PLCC-44, enabling shared PCB layouts across memory variants. The package features internal pull-ups on all I/O ports and supports through-hole mounting, making it ideal for industrial control boards where reliability and serviceability are critical.
How many interrupt sources and priority levels does the P87C51RB2BA,512 support?
The P87C51RB2BA,512 supports seven interrupt sources-including Timer 0, Timer 1, Timer 2, External INT0/INT1, UART, and PCA-and four programmable priority levels. Each interrupt can be individually enabled/disabled and assigned high/low priority via the IE and IP registers. This nested interrupt structure allows deterministic real-time response-for example, servicing a high-priority encoder capture event (CEX0) while deferring a lower-priority UART receive interrupt-without requiring external arbitration logic.
Can the P87C51RB2BA,512 generate PWM signals without external components?
Yes, the P87C51RB2BA,512 can generate multiple independent PWM signals using its integrated Programmable Counter Array (PCA). All five PCA modules (CEX0–CEX4) support PWM mode with adjustable duty cycle and frequency via RCAP2H/RCAP2L reload values and CCAPMn configuration bits. For instance, CEX0 can drive a motor phase while CEX1 controls an LED brightness-all synchronized to the same clock source and requiring no external PWM ICs or timers. This capability is confirmed in the PCA section of the official Philips product data sheet.
P87C51RB2BA,512 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Package/Case:
- 44-LCC (J-Lead)
- Series:
- 87C
- Packaging:
- Tube
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Core Processor:
- 8051
- Core Size:
- 8-Bit
- Speed:
- 33MHz
- Connectivity:
- EBI/EMI, UART/USART
- Peripherals:
- POR, PWM, WDT
- Number of I/O:
- 32
- Program Memory Size:
- 16KB (16K x 8)
- Program Memory Type:
- OTP
- EEPROM Size:
- -
- RAM Size:
- 512 x 8
- Voltage - Supply (Vcc/Vdd):
- 2.7V ~ 5.5V
- Data Converters:
- -
- Oscillator Type:
- Internal
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
P87C51RB2BA,512 FAQ
1.How can I place an order for P87C51RB2BA,512 through Aetrix?
Please submit a Request for Quotation (RFQ) for P87C51RB2BA,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 P87C51RB2BA,512 reliable?
The price and inventory of P87C51RB2BA,512 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for P87C51RB2BA,512 is usually 5 days.
3.What payment methods are accepted for P87C51RB2BA,512?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for P87C51RB2BA,512 transactions.
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4.How is shipping managed for P87C51RB2BA,512?
P87C51RB2BA,512 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your P87C51RB2BA,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 P87C51RB2BA,512?
For technical support, including P87C51RB2BA,512 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your P87C51RB2BA,512 requirements.
6.How does Aetrix verify that P87C51RB2BA,512 is sourced from the original manufacturer or authorized distributors?
All P87C51RB2BA,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 P87C51RB2BA,512 meets industry standards.
7.What is the process for return or replacement of P87C51RB2BA,512?
All P87C51RB2BA,512 units undergo pre-shipment inspection (PSI). If there is an issue with P87C51RB2BA,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 P87C51RB2BA,512 part is unused and in its original packaging.
Return procedure for P87C51RB2BA,512:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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