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NXP Semiconductors P87C51RB2FA,512
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- Part No.:
- P87C51RB2FA,512
- Manufacturer:
- NXP Semiconductors
- Category:
- Microcontrollers
- Package:
- 44-LCC (J-Lead)
- Datasheet:
-
P87C51RB2FA,512.pdf
- Description:
- IC MCU 8BIT 16KB OTP 44PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:1,499
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Product details
Overview
P87C51RB2FA,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 and supports both 6-clock and 12-clock modes for up to 30 MHz (6-clock) or 33 MHz (12-clock) operation - ideal for motor control and industrial embedded systems requiring precise timing and pulse-width modulation.
For engineers reviewing the P87C51RB2FA,512 datasheet, P87C51RB2FA,512 pinout, P87C51RB2FA,512 application, or P87C51RB2FA,512 equivalent, this page delivers verified technical context, validated pin functions across DIP40/PLCC44/LQFP44 packages, real-world use cases in motor drive and power supply control, and two confirmed alternative parts with documented functional and packaging differences.
Technical Context
The P87C51RB2FA,512 implements an accelerated 80C51 CPU core with dual clock mode selection (6- or 12-clock per machine cycle) controlled via OTP bit OX2 and SFR bit X2 in CKCON, enabling performance scaling without hardware change. Its enhanced peripheral set includes Timer 2 with capture/compare capability and a dedicated PCA module with five independent CEX channels (CEX0–CEX4) for simultaneous PWM generation and event timing.
It integrates a full-duplex enhanced UART with automatic address recognition and framing error detection, plus four priority-level nested interrupts sourced from seven vectors (INT0, INT1, T0, T1, T2, RxD, WRD). Power management includes Idle and Power-Down modes, with wake-up from Power-Down via external interrupt (INT0/INT1) and oscillator restart support within <10 ms.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Core Architecture | 80C51-compatible 8-bit CPU with Boolean processor and fully static operation |
| Program Memory | 16 KB one-time-programmable (OTP) ROM - non-volatile code storage without external EPROM |
| Data RAM | 512 bytes on-chip SRAM - sufficient for real-time control stacks and small buffers |
| Clock Modes | Configurable 6-clock or 12-clock operation - doubles effective throughput in 6-clock mode at same crystal frequency |
| Max Operating Frequency | 30 MHz at 6-clock mode / 33 MHz at 12-clock mode (VCC = 5 V) - enables high-speed I/O and PWM resolution |
| I/O Pins | 32 configurable bidirectional I/O pins across four ports - supports direct interface to sensors, drivers, and displays |
| Timers/Counters | Three 16-bit timers (T0/T1/T2) + PCA with five CEX channels - enables concurrent PWM, capture, and baud-rate generation |
| Supply Voltage Range | 2.7 V to 5.5 V - supports battery-powered and industrial 3.3 V/5 V systems without level-shifting |
Pinout & Package
Package: 40-pin Plastic Dual In-Line Package (PDIP), temperature range –40 °C to +85 °C, lead-free compatible (per ordering code P87C51RB2FN).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| P0.0–P0.7 | Open-drain bidirectional I/O / AD0–AD7 | Multiplexed address/data bus for external memory access; requires external pull-ups for reliable high-impedance input |
| P1.0–P1.7 | Bidirectional I/O with internal pull-ups | Primary general-purpose port; P1.0–P1.7 host PCA CEX0–CEX4 and T2/T2EX functions for PWM and event capture |
| P2.0–P2.7 | Bidirectional I/O / A8–A15 | High-order address bus during 16-bit external memory access; retains port function during 8-bit MOVX @Ri |
| P3.0–P3.7 | Bidirectional I/O with alternate functions | RxD/TxD (UART), INT0/INT1 (level-sensitive wake-up), T0/T1 (timer inputs), WR/RD (external memory strobes) |
| RST | Active-high reset input | Two-machine-cycle high pulse required; internal VSS resistor enables capacitor-based power-on reset |
| XTAL1/XTAL2 | Oscillator input/output | Supports crystal (1–20 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; latched at RST release |
| ALE/PROG | Address latch enable / programming pulse | Outputs address byte latch signal; disabled via AUXR.0 for noise reduction in 6-clock mode |
Key Features
| Feature | Design Value |
|---|---|
| Programmable Counter Array (PCA) | Five independent CEX channels (CEX0–CEX4) support simultaneous PWM generation, input capture, and software timers - eliminates need for external timing ICs in motor control |
| 6-Clock / 12-Clock Mode Selection | Software-configurable (CKCON.X2) or OTP-programmed (OX2) clock division - enables deterministic performance scaling without changing crystal or PCB layout |
| Enhanced UART with Framing Error Detection | Detects invalid stop bits and provides automatic address recognition - improves reliability in multi-drop RS-485 industrial networks |
| Power-Down Wake-Up via External Interrupt | INT0 and INT1 configured as level-sensitive inputs can exit Power-Down mode and restore full operation within <10 ms - critical for low-power sensor nodes |
| Security and Code Protection | Three OTP security bits and 64-byte encryption array prevent unauthorized read-out of firmware - meets basic IP protection requirements for OEM designs |
| Low EMI Design | 6-clock mode, slew-rate-controlled outputs, and ALE inhibit reduce radiated emissions - simplifies EMC compliance in Class B industrial environments |
Applications
| Motor Control System | Industrial Power Supply |
|---|---|
Use Scenario: Closed-loop DC motor speed regulation using feedback from hall-effect sensors and real-time PWM output. IC Role / Device Role / Timing Role: Primary controller executing PID algorithm, generating synchronized 16-bit PWM on CEX0–CEX2, capturing encoder edges on CEX3/CEX4, and managing UART-based host communication. Use Value: On-chip PCA eliminates external PWM generator and timer ICs; 32 I/O pins directly interface to gate drivers, current sense amps, and status LEDs without glue logic. | Use Scenario: Digital control of isolated DC-DC converter with voltage/current monitoring and fault reporting over RS-485. IC Role / Device Role / Timing Role: System supervisor handling ADC sampling (via external ADC interface), PWM duty cycle adjustment, overvoltage/overcurrent interrupt response, and enhanced UART communication with master controller. Use Value: Dual clock mode allows 6-clock operation for fast interrupt response (<330 ns latency) during fault conditions while maintaining 12-clock mode for lower EMI during steady-state operation. |
| Embedded HVAC Controller | Legacy Industrial PLC I/O Module |
Use Scenario: Standalone thermostat with temperature/humidity sensing, fan speed control, valve actuation, and local display. IC Role / Device Role / Timing Role: Main MCU managing sensor polling via I/O pins, driving triac-based AC loads using zero-cross detection on INT0, and updating 4-digit LED display via multiplexed port lines. Use Value: 512-byte RAM accommodates real-time control variables and display buffers; wide 2.7–5.5 V supply range tolerates brown-out conditions in field wiring. | Use Scenario: DIN-rail mounted digital I/O expansion module interfacing with Modbus RTU master via RS-485. IC Role / Device Role / Timing Role: Protocol handler implementing Modbus ASCII/RTU framing, managing discrete input debouncing (INT0/INT1), and controlling relay outputs via P1/P2 port writes. Use Value: Enhanced UART with framing error detection prevents corrupted command execution; four interrupt priority levels ensure timely response to emergency stop signals. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 8-bit microcontroller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT89C51RD2-RL24 | 16 KB Flash (reprogrammable), 1 KB RAM, same 8051 core and PCA peripherals; requires different programming voltage (VPP = 12 V vs. OTP 5 V) | Enables firmware updates in-system; higher RAM supports larger protocol stacks (e.g., Modbus TCP offload) | Select when design requires field firmware upgrades or extended data buffering beyond 512 B |
| P89V51RD2FA | 16 KB Flash, 1 KB RAM, identical pinout and SFR map; adds ISP capability and watchdog timer with windowed mode | Eliminates need for external programmer; improved fault recovery in unattended equipment | Select when production test efficiency or robustness against runaway code is prioritized over OTP cost advantage |
Compared with AT89C51RD2-RL24 and P89V51RD2FA, the P87C51RB2FA,512 offers lowest unit cost and highest OTP security for fixed-function deployments, but lacks in-system reprogrammability - making it optimal for high-volume, firmware-stable applications like appliance controllers and power modules.
Availability
P87C51RB2FA,512 is available at Aetrix Electronics and suitable for motor control systems, industrial power supplies, embedded HVAC controllers, and legacy PLC I/O modules requiring stable component supply across extended temperature ranges (–40 °C to +85 °C) and long product lifecycles.
Supply support for P87C51RB2FA,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, formerly Philips Semiconductors, is a global leader in high-performance mixed-signal ICs for automotive, industrial, and consumer applications, with deep heritage in 80C51 architecture development and manufacturing.
The P87C51RB2FA,512 belongs to the P87C51RA2/RB2/RC2/RD2 OTP microcontroller family, designed specifically for cost-sensitive, high-reliability embedded control applications where firmware immutability, wide supply voltage tolerance, and integrated timing peripherals reduce system BOM and board space.
FAQ
What is the maximum operating frequency of the P87C51RB2FA,512 and how does clock mode affect it?
The P87C51RB2FA,512 supports up to 33 MHz in 12-clock mode and 30 MHz in 6-clock mode at VCC = 5 V. The 6-clock mode effectively doubles instruction throughput versus standard 80C51 devices at the same crystal frequency. Clock mode is selected either by programming OTP bit OX2 (permanent) or setting SFR bit X2 in CKCON (software-controllable), with OTP override taking precedence. This flexibility allows the P87C51RB2FA,512 to balance performance, EMI, and power consumption in final system tuning.
Does the P87C51RB2FA,512 support in-system programming (ISP) or only parallel programming?
The P87C51RB2FA,512 supports parallel programming only - it does not feature in-system programming (ISP) capability. Programming requires a commercial parallel programmer compatible with the 87C51 interface, applying VPP (12.5 V) to the EA/VPP pin while holding RST high. Once programmed, the OTP memory is permanently locked. This makes the P87C51RB2FA,512 suitable for production-fixed firmware but unsuitable for field updates. For ISP needs, consider the flash-based P89V51RD2FA as an alternative.
How many PWM channels does the P87C51RB2FA,512 provide and what is their resolution?
Through its Programmable Counter Array (PCA), the P87C51RB2FA,512 provides five independent PWM-capable channels (CEX0–CEX4) on Port 1 pins. Each channel supports 16-bit resolution via the CCAPnH/CCAPnL registers, enabling fine-grained duty cycle control (e.g., 0.0015% steps at 1 MHz carrier). PWM output is generated without CPU intervention once configured, freeing the 80C51 core for other tasks - a key advantage in real-time motor control where jitter must be minimized.
Can the P87C51RB2FA,512 operate from a 3.3 V supply and still achieve full speed?
Yes, the P87C51RB2FA,512 is fully specified for operation from 2.7 V to 5.5 V. At 3.3 V, it supports frequencies up to 16 MHz in both 6-clock and 12-clock modes, as confirmed in the "Freq. Range at 3V" column of the Selection Table. This allows direct integration into 3.3 V systems without level shifters. However, maximum speed (30/33 MHz) requires VCC ≥ 4.5 V. The P87C51RB2FA,512's wide voltage range simplifies power architecture in mixed-voltage industrial designs.
What package options are available for the P87C51RB2FA,512 and which one is used in this part number?
The P87C51RB2FA,512 is offered in PDIP40 (DIP40), PLCC44, and LQFP44 packages. The suffix "FA" in P87C51RB2FA,512 specifically denotes the –40 °C to +85 °C temperature grade in the PDIP40 package (ordering code P87C51RB2FN per Philips documentation). This through-hole package supports manual prototyping, wave soldering, and legacy board designs requiring socketed microcontrollers - distinguishing it from surface-mount variants like P87C51RB2BBD (LQFP).
P87C51RB2FA,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:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
P87C51RB2FA,512 FAQ
1.How can I place an order for P87C51RB2FA,512 through Aetrix?
Please submit a Request for Quotation (RFQ) for P87C51RB2FA,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 P87C51RB2FA,512 reliable?
The price and inventory of P87C51RB2FA,512 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for P87C51RB2FA,512 is usually 5 days.
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Once your P87C51RB2FA,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 P87C51RB2FA,512?
For technical support, including P87C51RB2FA,512 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your P87C51RB2FA,512 requirements.
6.How does Aetrix verify that P87C51RB2FA,512 is sourced from the original manufacturer or authorized distributors?
All P87C51RB2FA,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 P87C51RB2FA,512 meets industry standards.
7.What is the process for return or replacement of P87C51RB2FA,512?
All P87C51RB2FA,512 units undergo pre-shipment inspection (PSI). If there is an issue with P87C51RB2FA,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 P87C51RB2FA,512 part is unused and in its original packaging.
Return procedure for P87C51RB2FA,512:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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