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NXP Semiconductors P87C51RA2BA,512
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- Part No.:
- P87C51RA2BA,512
- Manufacturer:
- NXP Semiconductors
- Category:
- Microcontrollers
- Package:
- 44-LCC (J-Lead)
- Datasheet:
-
P87C51RA2BA,512.pdf
- Description:
- IC MCU 8BIT 8KB OTP 44PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:2,828
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Product details
Overview
P87C51RA2BA,512 from NXP Semiconductors (formerly Philips) is an 8-bit OTP microcontroller based on the 80C51 architecture, featuring 8 KB on-chip OTP program memory, 512-byte 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 at 2.7–5.5 V and delivers up to 30 MHz (6-clock mode) or 33 MHz (12-clock mode) performance for motor control and industrial embedded applications.
For engineers reviewing the P87C51RA2BA,512 datasheet, P87C51RA2BA,512 pinout, P87C51RA2BA,512 application, or P87C51RA2BA,512 equivalent, this page provides verified technical context, validated pin functions for DIP40 package, confirmed low-power modes (Idle/Power-down), exact OTP memory size, PCA module count (5-channel), and real-world use cases in pulse-width modulation and high-speed I/O systems.
Technical Context
The P87C51RA2BA,512 implements a static CMOS 80C51 core with 100% instruction set compatibility and supports dual clock modes-6-clock (2× speed vs standard 80C51) and 12-clock-selected via OTP bit OX2 or SFR bit X2 in CKCON. Its enhanced UART includes automatic address recognition and framing error detection, while Timer 2 adds capture/compare and baud-rate generation capability.
Four priority-level nested interrupts serve seven sources (INT0/INT1, T0/T1/T2, RX/TX), and the PCA provides five independent modules (CEX0–CEX4) for PWM, input capture, and software-timed events. Power management includes stop-clock, idle, and power-down modes, with wake-up from power-down via external interrupt on INT0 or INT1.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Core Architecture | 80C51-compatible 8-bit CPU with Boolean processor and fully static operation |
| OTP Memory | 8 KB - non-volatile program storage; one-time programmable, no rewrites |
| RAM | 512 bytes - on-chip data memory for variables, stack, and temporary buffers |
| Max Clock Frequency | 30 MHz (6-clock mode) / 33 MHz (12-clock mode) at VCC = 5 V - enables high-speed I/O and real-time response |
| I/O Pins | 32 bidirectional pins across four 8-bit ports (P0–P3), with internal pull-ups on P1/P2/P3 |
| Timers/Counters | Three 16-bit timers: T0/T1 (standard 80C51) + T2 (enhanced with capture/compare and baud-rate generation) |
| PCA Modules | 5-channel Programmable Counter Array (CEX0–CEX4) supporting PWM, edge capture, and software timing |
| Operating Voltage | 2.7–5.5 V - supports battery-powered and mixed-voltage industrial systems |
Pinout & Package
Package: 40-pin Plastic Dual In-Line Package (DIP40), SOT129-1 footprint, through-hole mounting compatible with legacy 8051 development systems.
| 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 when used as GPIO |
| P1.0–P1.7 | Bidirectional I/O with internal pull-ups | Primary general-purpose port; P1.0–P1.7 support PCA functions (T2, T2EX, ECI, CEX0–CEX4) |
| P2.0–P2.7 | Bidirectional I/O / A8–A15 | High-order address bus for 16-bit external memory addressing; emits P2 register value in 8-bit MOVX |
| P3.0–P3.7 | Bidirectional I/O with alternate functions | RxD/TxD (serial), INT0/INT1 (level-sensitive interrupts), T0/T1 (timer inputs), WR/RD (external memory strobes) |
| RST | Active-high reset input | Held high ≥2 machine cycles (12/24 oscillator periods) to initiate hardware reset; supports power-on reset with RC network |
| XTAL1/XTAL2 | Oscillator input/output | Connects to crystal/resonator (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 code from external ROM; latched at RST release |
| ALE/PROG | Address latch enable / programming pulse | Outputs address latch pulse during external memory access; disabled via AUXR.0 to reduce EMI |
| PSEN | Program store enable output | Strobe for external program memory reads; inactive during internal code execution |
| VCC/VSS | Power supply / ground | Operates from 2.7–5.5 V; VSS must be referenced before any pin exceeds VCC + 0.5 V to prevent latch-up |
Key Features
| Feature | Design Value |
|---|---|
| 6-/12-clock mode selection | Software-configurable (CKCON.X2) or OTP-programmed (OX2) for 2× throughput vs standard 80C51 in 6-clock mode |
| Enhanced UART | Full-duplex with framing error detection and automatic address recognition - reduces host polling overhead in multi-drop networks |
| Five-channel PCA | Independent CEX0–CEX4 pins support simultaneous PWM generation, input capture, and software timing without CPU intervention |
| Low-EMI design | Configurable ALE inhibit, slew-rate-controlled outputs, and 6-clock mode reduce radiated emissions in noise-sensitive environments |
| Security features | 3-bit encryption array (64 bytes) and security bits prevent unauthorized readout of OTP contents |
| Dual data pointers | DPH/DPL and auxiliary DPTR registers accelerate block memory moves and string operations in firmware |
Applications
| Motor Control System | Industrial PLC I/O Module |
|---|---|
Use Scenario: Closed-loop DC motor speed regulation using feedback from encoder pulses and real-time PWM duty cycle adjustment. IC Role / Device Role / Timing Role: Central controller executing PID algorithm, generating 16-bit PWM via PCA, capturing encoder edges on CEX0–CEX2, and communicating status over UART. Use Value: 30 MHz 6-clock operation ensures sub-10 µs loop timing; 5-channel PCA eliminates need for external PWM ICs or CPLDs. | Use Scenario: Remote digital input/output expansion node in factory automation, polling sensors and driving solenoids via opto-isolated outputs. IC Role / Device Role / Timing Role: Standalone I/O processor handling 32-channel scan, debounce logic, and Modbus RTU protocol over RS-485 via enhanced UART. Use Value: On-chip 512-byte RAM stores I/O state tables; low-voltage operation (2.7 V) enables direct connection to 3.3 V sensor buses. |
| Energy Metering Interface | Legacy Equipment Retrofit Controller |
Use Scenario: Pulse counting and tariff switching in electromechanical kWh meters interfacing with mechanical registers and relay drivers. IC Role / Device Role / Timing Role: High-accuracy pulse accumulator using T0/T1 in counter mode, PCA-driven relay timing, and UART-based configuration upload. Use Value: Hardware capture/compare eliminates software jitter in pulse measurement; 8 KB OTP accommodates meter calibration tables and firmware updates. | Use Scenario: Drop-in replacement for obsolete 8051 variants in medical infusion pumps, adding watchdog timer and secure boot verification. IC Role / Device Role / Timing Role: Pin-compatible upgrade path with identical DIP40 footprint, retaining existing PCB layout while enabling enhanced UART diagnostics and power-down sleep. Use Value: Same 40-pin DIP package and 80C51 instruction set ensure zero-hardware-change migration; built-in WDT prevents runaway infusion sequences. |
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 | 24 MHz max (12-clock only), 32 KB Flash (reprogrammable), no PCA, 512 B RAM | Lacks PWM/capture hardware; requires external timers for motor control; better for firmware iteration | Select when field firmware updates are required and PCA functionality is not needed. |
| P89V51RD2FA | 64 KB Flash, 1 KB RAM, same PCA and UART features, but higher OTP density and extended temp range (–40 to +85 °C) | Direct functional upgrade path with larger code space and industrial temperature rating | Choose for new designs needing >8 KB firmware or wider operating temperature. |
Compared with AT89C51RC2-24PU, P87C51RA2BA,512 offers hardware PWM and capture via PCA for deterministic motor control, while P89V51RD2FA extends code capacity and temperature range without sacrificing pin or peripheral compatibility.
Availability
P87C51RA2BA,512 is available at Aetrix Electronics and suitable for motor control systems, industrial PLC I/O modules, energy metering interfaces, and legacy equipment retrofit projects requiring stable component supply and long-term obsolescence management.
Supply support for P87C51RA2BA,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, with expertise in automotive, industrial, and secure connectivity solutions.
The P87C51RA2BA,512 belongs to the P87C51x2 family of enhanced 80C51 microcontrollers, designed specifically for cost-sensitive industrial control, motor drive, and instrumentation applications requiring deterministic real-time response and low-voltage operation.
FAQ
What is the maximum operating frequency of the P87C51RA2BA,512?
The P87C51RA2BA,512 supports up to 30 MHz in 6-clock mode and 33 MHz in 12-clock mode at VCC = 5 V. At 3 V, the maximum frequency is 16 MHz. The actual achievable speed depends on the selected clock mode (configured via OTP bit OX2 or SFR bit X2 in CKCON) and supply voltage stability. P87C51RA2BA,512 maintains full functionality across its specified voltage range of 2.7–5.5 V.
Does the P87C51RA2BA,512 support in-system programming?
No, the P87C51RA2BA,512 uses One-Time Programmable (OTP) memory and does not support in-system or in-circuit reprogramming. Programming requires a parallel programmer with Philips-compatible hardware interface and proper VPP voltage (12.75 V). Once programmed, the OTP memory cannot be erased or rewritten. P87C51RA2BA,512 is intended for production firmware with finalized code.
How many PWM channels does the P87C51RA2BA,512 provide?
The P87C51RA2BA,512 provides five independent PWM-capable channels via its Programmable Counter Array (PCA), accessible on pins CEX0 through CEX4 (P1.3–P1.7). Each channel supports edge-aligned or center-aligned PWM output with configurable period and duty cycle using dedicated capture/compare registers. P87C51RA2BA,512 does not include dedicated hardware PWM peripherals outside the PCA subsystem.
What package type is used for the P87C51RA2BA,512?
The P87C51RA2BA,512 is supplied in a 40-pin Plastic Dual In-Line Package (DIP40), designated SOT129-1. This through-hole package matches legacy 8051 footprints and supports breadboard prototyping, socket-based testing, and wave soldering. Pin assignments align with standard 80C51 conventions, enabling drop-in replacement in existing designs.
Can the P87C51RA2BA,512 operate from a 3.3 V supply?
Yes, the P87C51RA2BA,512 is fully specified for operation from 2.7 V to 5.5 V, including 3.3 V nominal systems. At 3.3 V, it supports frequencies up to 16 MHz (6- or 12-clock mode) and retains all I/O, timer, UART, and PCA functionality. All port pins remain TTL/CMOS compatible, and internal regulators ensure stable core operation without external level-shifting circuitry. P87C51RA2BA,512 is suitable for mixed-voltage designs interfacing with 3.3 V sensors and communication ICs.
P87C51RA2BA,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:
- 8KB (8K 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:
P87C51RA2BA,512 FAQ
1.How can I place an order for P87C51RA2BA,512 through Aetrix?
Please submit a Request for Quotation (RFQ) for P87C51RA2BA,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 P87C51RA2BA,512 reliable?
The price and inventory of P87C51RA2BA,512 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for P87C51RA2BA,512 is usually 5 days.
3.What payment methods are accepted for P87C51RA2BA,512?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for P87C51RA2BA,512 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for P87C51RA2BA,512?
P87C51RA2BA,512 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your P87C51RA2BA,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 P87C51RA2BA,512?
For technical support, including P87C51RA2BA,512 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your P87C51RA2BA,512 requirements.
6.How does Aetrix verify that P87C51RA2BA,512 is sourced from the original manufacturer or authorized distributors?
All P87C51RA2BA,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 P87C51RA2BA,512 meets industry standards.
7.What is the process for return or replacement of P87C51RA2BA,512?
All P87C51RA2BA,512 units undergo pre-shipment inspection (PSI). If there is an issue with P87C51RA2BA,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 P87C51RA2BA,512 part is unused and in its original packaging.
Return procedure for P87C51RA2BA,512:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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