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NXP Semiconductors P87C51RD2FA,512
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- Part No.:
- P87C51RD2FA,512
- Manufacturer:
- NXP Semiconductors
- Category:
- Microcontrollers
- Package:
- 44-LCC (J-Lead)
- Datasheet:
-
P87C51RD2FA,512.pdf
- Description:
- IC MCU 8BIT 64KB OTP 44PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:1,469
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Product details
Overview
P87C51RD2FA,512 from NXP Semiconductors (formerly Philips) is an 8-bit OTP microcontroller based on the 80C51 architecture, featuring 64 KB on-chip OTP program memory, 1 KB RAM, four 8-bit I/O ports, 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 across 2.7–5.5 V and delivers up to 33 MHz at 5 V in 12-clock mode - used in motor control systems requiring precise pulse-width modulation and high-speed I/O.
For engineers reviewing the P87C51RD2FA,512 datasheet, P87C51RD2FA,512 pinout, P87C51RD2FA,512 application, or P87C51RD2FA,512 equivalent, key selection criteria include its 64 KB OTP capacity, 1 KB RAM, PCA-based PWM capability, dual clock modes (6-/12-clock), extended temperature range (–40°C to +85°C), and PLCC-44 package compatibility with industrial embedded control designs.
Technical Context
The P87C51RD2FA,512 implements an accelerated 80C51 CPU core with selectable 6-clock or 12-clock operation-configured either via OTP bit OX2 (parallel programming) or SFR bit X2 (CKCON.0). Its enhanced peripheral set includes Timer 2 with capture/compare and baud-rate generation, a full-duplex UART with automatic address recognition, and a 5-channel PCA for simultaneous PWM and event timing.
It supports low-power operation through Idle and Power-Down modes, with wake-up from Power-Down via external interrupts (INT0/INT1), and features security bits, encryption array (64 bytes), dual data pointers, and programmable clock-out on P1.0. The device retains full 80C51 instruction set compatibility while extending memory addressing to 64 KB ROM and 64 KB RAM.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Core Architecture | 80C51-compatible 8-bit CPU with Boolean processor and fully static operation |
| Program Memory | 64 KB one-time-programmable (OTP) ROM - non-volatile code storage without external EPROM |
| Data RAM | 1 KB on-chip SRAM - sufficient for real-time control stacks and intermediate buffers |
| Operating Voltage | 2.7 V to 5.5 V - supports battery-backed and wide-input industrial power rails |
| Max Clock Frequency | 33 MHz at 5 V (12-clock mode); 30 MHz at 3 V - enables high-throughput I/O and timer resolution |
| Timer Resources | Three 16-bit timers/counters (T0/T1/T2) plus 5-channel PCA - supports multi-axis motor commutation and input capture |
| I/O Ports | Four 8-bit bidirectional ports (P0–P3) with internal pull-ups - configurable as general-purpose or alternate-function pins |
| Serial Interface | Enhanced UART with framing error detection and automatic address recognition - simplifies multi-drop RS-485 network implementation |
Pinout & Package
Package: PLCC-44 (SOT187-2), leaded chip carrier with 44 pins, rated for –40°C to +85°C operation and compatible with reflow and wave soldering.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| P0.0–P0.7 | Port 0 I/O / AD0–AD7 | Open-drain bidirectional port; multiplexed address/data bus for external memory access |
| P1.0–P1.7 | Port 1 I/O / T2, T2EX, ECI, CEX0–CEX4 | General-purpose I/O with PCA channel support - CEX0–CEX4 enable five independent PWM outputs |
| P2.0–P2.7 | Port 2 I/O / A8–A15 | Bidirectional port with internal pull-ups; outputs high-order address during 16-bit external memory access |
| P3.0–P3.7 | Port 3 I/O / RxD, TxD, INT0–INT1, T0–T1, WR, RD | Dedicated serial, interrupt, and memory control signals - enables direct connection to external peripherals without glue logic |
| RST | Reset Input | Active-high reset requiring ≥2 machine cycles; supports power-on and external reset sequencing |
| XTAL1 / XTAL2 | Oscillator Inputs | Supports crystal (1–24 MHz) or external clock source; determines system timing base for all peripherals |
| EA/VPP | External Access Enable | High = execute from internal OTP; low = fetch code from external memory - enables hybrid memory configurations |
| ALE/PROG | Address Latch Enable | Output strobe for latching P0 address bits; programmable disable via SFR to reduce EMI |
Key Features
| Feature | Design Value |
|---|---|
| Programmable Counter Array (PCA) | Five independent channels (CEX0–CEX4) supporting PWM generation, input capture, and software timers - eliminates need for external timing ICs in motor drive designs |
| Selectably Optimized Clock Mode | 6-clock or 12-clock operation - doubles effective throughput vs standard 80C51 when enabled, without changing code or toolchain |
| Enhanced UART with Framing Detection | Hardware-level framing error flag and automatic address recognition - reduces firmware overhead in multi-node serial networks |
| Low-Power Operation Modes | Idle and Power-Down modes with wake-up via INT0/INT1 - extends battery life in portable industrial sensors |
| Security & Code Protection | Three security bits and 64-byte encryption array - prevents unauthorized readout of OTP firmware in deployed systems |
| Extended Temperature Range | –40°C to +85°C operation - qualified for use in automotive under-hood and factory automation environments |
Applications
| Motor Control System | Industrial PLC I/O Module |
|---|---|
Use Scenario: Closed-loop DC/BLDC motor control with position feedback and current sensing. IC Role / Device Role / Timing Role: Main controller executing PID loops, generating synchronized PWM for gate drivers, and capturing encoder pulses via PCA inputs. Use Value: On-chip 5-channel PCA eliminates external PWM generators; 1 KB RAM accommodates real-time control variables and filter coefficients. | Use Scenario: Modular digital input/output expansion unit with serial backplane interface. IC Role / Device Role / Timing Role: Local intelligence node managing opto-isolated inputs, relay drivers, and RS-485 communication with master controller. Use Value: Enhanced UART with auto-address recognition enables plug-and-play node identification; 64 KB OTP stores firmware and configuration tables. |
| Smart Power Supply Monitor | Embedded HVAC Controller |
Use Scenario: AC/DC power supply with voltage/current monitoring, fault logging, and fan speed regulation. IC Role / Device Role / Timing Role: System supervisor handling ADC sampling (via external converter), PWM fan control, and non-volatile event logging. Use Value: Dual data pointers simplify buffer management between sensor reads and EEPROM writes; low-voltage operation (2.7 V) ensures function during brownout conditions. | Use Scenario: Standalone HVAC thermostat with temperature/humidity sensing, display driver, and compressor sequencing. IC Role / Device Role / Timing Role: Primary MCU coordinating sensor polling, user interface updates, and multi-stage compressor/valve actuation timing. Use Value: Four 8-bit I/O ports directly drive LED segments and relays; 33 MHz max frequency ensures responsive UI and fast thermal loop response. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 8-bit microcontroller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT89C51ED2-RL24 | 64 KB Flash (reprogrammable), 1 KB RAM, same 8051 core, but lacks PCA and has different interrupt priority mapping | Preferred for prototyping and firmware iteration due to Flash reprogrammability; unsuitable where hardware-level PWM timing determinism is required | Select only if field firmware updates are mandatory and PCA-based PWM is not needed |
| P89C668FBD,518 | 64 KB Flash, 1.25 KB RAM, enhanced UART with IrDA support, but no PCA and only two 16-bit timers | Better suited for communication-centric designs (e.g., modem interfaces); lacks dedicated capture/compare hardware for motor control | Choose when serial protocol flexibility outweighs deterministic PWM timing requirements |
Compared with AT89C51ED2-RL24 and P89C668FBD,518, the P87C51RD2FA,512 provides guaranteed hardware PWM timing via its 5-channel PCA and OTP-based code integrity - critical for safety-critical motor drives where flash wear-out or unintended reprogramming must be avoided.
Availability
P87C51RD2FA,512 is available at Aetrix Electronics and suitable for motor control systems, industrial PLC modules, smart power monitors, and embedded HVAC controllers requiring stable component supply, long-term lifecycle assurance, and extended temperature performance.
Supply support for P87C51RD2FA,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 secure, high-performance solutions for automotive, industrial, and IoT applications - formed from the spin-off of Philips Semiconductors in 2006.
The P87C51RD2FA,512 belongs to NXP's legacy 80C51-based microcontroller family, designed specifically for cost-sensitive, high-reliability embedded control applications where OTP security, deterministic timing, and industrial temperature tolerance are essential.
FAQ
What is the maximum operating frequency of the P87C51RD2FA,512 at 5 V?
The P87C51RD2FA,512 supports up to 33 MHz at 5 V in 12-clock mode and 30 MHz in 6-clock mode. Its oscillator circuit accepts crystals from 1 MHz to 24 MHz, and the internal clock divider allows selection between 6-clock and 12-clock operation - enabling higher effective throughput without changing the external crystal.
Does the P87C51RD2FA,512 support in-system programming (ISP)?
No, the P87C51RD2FA,512 uses one-time-programmable (OTP) memory and does not support in-system programming. Programming requires parallel programming hardware with VPP (12.5 V) applied to the EA/VPP pin. Once programmed, the OTP memory cannot be erased or rewritten - ensuring firmware immutability in production deployments.
How many PWM outputs does the P87C51RD2FA,512 provide, and how are they implemented?
The P87C51RD2FA,512 provides five independent PWM outputs via its Programmable Counter Array (PCA), using pins CEX0–CEX4 on Port 1. Each channel operates with configurable duty cycle and period using 16-bit capture/compare registers (CCAPnH/CCAPnL), enabling simultaneous control of multiple actuators without CPU intervention.
What package type and pin count does the P87C51RD2FA,512 use?
The P87C51RD2FA,512 is supplied in a 44-pin Plastic Leaded Chip Carrier (PLCC) package, designated SOT187-2. It features a square body with J-leads, rated for –40°C to +85°C operation, and is compatible with standard surface-mount reflow processes.
Can the P87C51RD2FA,512 operate from a 3 V supply, and what is its performance at that voltage?
Yes, the P87C51RD2FA,512 operates from 2.7 V to 5.5 V. At 3 V, its maximum frequency is 16 MHz in both 6-clock and 12-clock modes. This allows reliable operation in battery-powered or low-voltage industrial systems while maintaining full peripheral functionality including UART, timers, and PCA.
P87C51RD2FA,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:
- 64KB (64K x 8)
- Program Memory Type:
- OTP
- EEPROM Size:
- -
- RAM Size:
- 1K 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:
P87C51RD2FA,512 FAQ
1.How can I place an order for P87C51RD2FA,512 through Aetrix?
Please submit a Request for Quotation (RFQ) for P87C51RD2FA,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 P87C51RD2FA,512 reliable?
The price and inventory of P87C51RD2FA,512 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for P87C51RD2FA,512 is usually 5 days.
3.What payment methods are accepted for P87C51RD2FA,512?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for P87C51RD2FA,512 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for P87C51RD2FA,512?
P87C51RD2FA,512 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your P87C51RD2FA,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 P87C51RD2FA,512?
For technical support, including P87C51RD2FA,512 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your P87C51RD2FA,512 requirements.
6.How does Aetrix verify that P87C51RD2FA,512 is sourced from the original manufacturer or authorized distributors?
All P87C51RD2FA,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 P87C51RD2FA,512 meets industry standards.
7.What is the process for return or replacement of P87C51RD2FA,512?
All P87C51RD2FA,512 units undergo pre-shipment inspection (PSI). If there is an issue with P87C51RD2FA,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 P87C51RD2FA,512 part is unused and in its original packaging.
Return procedure for P87C51RD2FA,512:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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