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NXP Semiconductors P87C51RC+4B,557
- Part No.:
- P87C51RC+4B,557
- Manufacturer:
- NXP Semiconductors
- Category:
- Microcontrollers
- Package:
- 44-QFP
- Datasheet:
-
P87C51RC+4B,557.pdf
- Description:
- IC MCU 8BIT 32KB OTP 44PQFP
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
P87C51RC+4B,557 from NXP Semiconductors (formerly Philips Semiconductors) is an 8-bit OTP microcontroller based on the enhanced 80C51 architecture, featuring 32 KB on-chip OTP program memory, 512 bytes RAM, hardware watchdog timer, and programmable counter array (PCA) with five capture/compare modules. It operates from 2.7 V to 5.5 V at up to 16 MHz and targets embedded control applications requiring reliable non-volatile code storage and real-time I/O timing.
For engineers reviewing the P87C51RC+4B,557 datasheet, P87C51RC+4B,557 pinout, P87C51RC+4B,557 application, or P87C51RC+4B,557 equivalent, key selection considerations include its 44-pin PQFP package, PCA-based PWM generation, dual DPTR support, asynchronous port reset, and low-EMI ALE inhibit capability in industrial motor control and sensor interface designs.
Technical Context
This device belongs to the 8XC51RA+/RB+/RC+/RD+ family - a derivative of the 80C51 core with architectural enhancements including a hardware watchdog timer, PCA module supporting edge-capture, software-timed compare, and PWM output across five channels (CEX0–CEX4), and full-duplex UART with framing error detection and automatic address recognition.
It supports external memory expansion up to 64 KB via multiplexed Port 0 (AD0–AD7) and Port 2 (A8–A15), uses standard 80C51 instruction set compatibility, and implements four priority-level nested interrupts with six interrupt sources (INT0, INT1, T0, T1, RxD/TxD, PCA). The PCA clock source can be selected from internal oscillator, ECI input, or Timer 2 overflow.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Core Architecture | Enhanced 80C51-compatible 8-bit CPU with full instruction set compatibility and static design for 0–16 MHz operation. |
| Program Memory | 32 KB OTP ROM - non-volatile, one-time programmable memory suitable for production firmware with security bit protection. |
| RAM Size | 512 bytes internal RAM - double the capacity of base 80C51, enabling larger stack depth and data buffers for multitask-like firmware. |
| PCA Channels | 5-channel Programmable Counter Array - supports independent PWM, input capture, and software-timed compare on P1.0–P1.7. |
| Watchdog Timer | Hardware WDT with dedicated WDTRST register - provides autonomous system recovery without CPU intervention during lockup. |
| Operating Voltage | 2.7 V to 5.5 V - enables direct interface with both 3.3 V and 5 V logic systems and battery-powered operation down to 2.7 V. |
| Package Type | 44-pin Plastic Quad Flat Pack (PQFP), SOT307-2 footprint - surface-mount compatible with standard reflow profiles and 0.8 mm lead pitch. |
Pinout & Package
Package: 44-pin Plastic Quad Flat Pack (PQFP), SOT307-2, 10 mm × 10 mm body, 0.8 mm lead pitch, lead-free compatible.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| P0.0–P0.7 | Multiplexed AD0–AD7 / Data Bus | Open-drain bidirectional port; functions as lower 8-bit address/data bus during external memory access; requires external pull-ups for bus mode. |
| P1.0–P1.7 | CEX0–CEX4 / T2 / T2EX / ECI | Dedicated PCA I/O pins - support PWM output, edge-triggered capture, and external clock input (ECI) for precise timing control. |
| P2.0–P2.7 | A8–A15 / Port 2 | Bidirectional port with internal pull-ups; outputs upper address byte during 16-bit MOVX @DPTR accesses to external memory. |
| P3.0–P3.7 | RxD/TxD/INT0/INT1/T0/T1/WR/RD | Standard 80C51 alternate function port - provides serial communication, external interrupts, timer inputs, and external memory strobes. |
| XTAL1/XTAL2 | Oscillator Input/Output | Connects to quartz crystal (1–16 MHz) or external clock source; XTAL1 accepts CMOS-level input when using external clock. |
| RST | Reset Input | Asynchronous active-high reset; requires ≥2 machine cycles (24 oscillator periods) high pulse; internal weak pull-down permits RC power-on reset. |
| EA/VPP | External Access Enable | Low = execute from external program memory; high = execute from internal OTP up to 32 KB limit; also receives 12.75 V during programming. |
Key Features
| Feature | Design Value |
|---|---|
| Second DPTR register | Enables efficient indirect addressing of two separate external data memory regions without software-managed pointer swapping. |
| Programmable Clock-Out (PCLK) | Generates user-selectable clock signal on P1.0 (T2) for synchronizing external peripherals or test equipment. |
| Low-EMI ALE inhibit | Reduces radiated emissions by disabling ALE pulses during idle or critical timing windows via AUXR.AO bit. |
| Asynchronous port reset | Allows individual port latches to be reset independently of CPU state - useful for recovering from bus contention or latch-up conditions. |
| Security bits (3-bit OTP lock) | Prevents unauthorized read-out of program memory contents by permanently disabling external verification after programming. |
Applications
| Industrial Motor Control | Smart Sensor Interface |
|---|---|
Use Scenario: Closed-loop DC motor speed regulation using feedback from optical encoder and PWM-driven H-bridge driver. IC Role / Device Role / Timing Role: Primary controller executing PID algorithm, generating 16-bit resolution PWM on CEX0–CEX2, capturing encoder edges on CEX3/CEX4, and managing UART telemetry. Use Value: Hardware PCA eliminates CPU overhead for PWM and capture tasks, enabling deterministic 100 µs loop timing at 16 MHz while servicing UART and fault monitoring. | Use Scenario: Multi-sensor node aggregating analog temperature, humidity, and pressure readings via ADC-equipped external ICs. IC Role / Device Role / Timing Role: Master controller coordinating I²C/SPI sensor reads, timestamping events with PCA, buffering data in 512-byte RAM, and transmitting over RS-485 via enhanced UART. Use Value: Dual DPTR allows simultaneous access to sensor register maps and local buffer memory; watchdog ensures recovery from bus hang during sensor comms timeout. |
| Energy Metering Front-End | Legacy Industrial PLC I/O Module |
Use Scenario: Pulse counting and tariff switching in electromechanical kWh meters interfacing with reed switches and relay drivers. IC Role / Device Role / Timing Role: Dedicated pulse accumulator using PCA CEX0 in capture mode, driving opto-isolated relays via Port 1, and logging time-of-use data to external EEPROM via I²C bit-banged on P3 pins. Use Value: Hardware edge capture ensures no pulse loss at >10 kHz input rates; low-voltage operation (2.7 V) supports wide-range AC/DC auxiliary supply designs. | Use Scenario: DIN-rail mounted digital I/O expansion module converting Modbus RTU commands into discrete 24 V DC input sampling and relay output control. IC Role / Device Role / Timing Role: Protocol handler executing Modbus ASCII/RTU stack, scanning 16-channel opto-isolated inputs via Port 0, and driving 8-channel relay drivers via Port 2 with debounced edge detection. Use Value: Four priority-level interrupts allow immediate response to input change events while maintaining Modbus reply timing; EA pin enables seamless integration with existing 8051-based main controller backplane. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 8-bit microcontroller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| P87C51RB+4B,557 | 16 KB OTP, same 44-pin PQFP package, identical peripheral set except reduced program memory. | Suitable for smaller firmware footprints where 32 KB is unnecessary; retains full PCA, WDT, and UART functionality. | Select when application code size fits within 16 KB and cost optimization is prioritized without sacrificing timing features. |
| P87C51RD+4B,557 | 64 KB OTP, same package and peripherals, extended memory addressing capability beyond 32 KB boundary. | Required for complex control algorithms or bootloader + application partitioning exceeding 32 KB code space. | Choose when future firmware growth or field-upgradable secure bootloaders demand >32 KB internal program storage. |
Compared with P87C51RB+4B,557, the P87C51RC+4B,557 offers double the OTP capacity for larger control logic while maintaining identical timing performance and I/O flexibility; versus P87C51RD+4B,557, it trades 32 KB of excess memory for tighter cost and power profile in mid-complexity applications.
Availability
P87C51RC+4B,557 is available at Aetrix Electronics and suitable for industrial motor control, smart sensor interface, energy metering front-end, and legacy PLC I/O module designs requiring stable component supply and long-term obsolescence management.
Supply support for P87C51RC+4B,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 company formed from the spin-off of Philips Semiconductors in 2006, specializing in secure connectivity solutions for automotive, industrial, and IoT markets.
The 8XC51RA+/RB+/RC+/RD+ product line was designed to extend the 80C51 architecture with enhanced reliability features - including hardware watchdog, PCA-based timing, and OTP security - for cost-sensitive industrial control applications demanding long-lifecycle support.
FAQ
What is the maximum operating frequency of the P87C51RC+4B,557?
The P87C51RC+4B,557 supports a maximum operating frequency of 16 MHz across its specified voltage range (2.7 V to 5.5 V). This is confirmed in the Philips Semiconductors ordering information table for the "4B" suffix variant, which lists 0 to 16 MHz under FREQ. (MHz) for all 8XC51RA+/RB+/RC+/RD+ devices in PQFP packages. Higher-speed variants (e.g., "IB" or "JB") exist but require 5 V supply only.
Does the P87C51RC+4B,557 include a hardware watchdog timer?
Yes, the P87C51RC+4B,557 includes a dedicated hardware watchdog timer, a distinguishing feature of the 8XC51RA+/RB+/RC+/RD+ family versus earlier 8XC51FA/FB/FC variants. Its operation is controlled via the WDTRST special function register (SFR) at address 0A6H, and it resets the device if not periodically cleared by firmware - providing autonomous recovery from software lockups.
What package type and pin count does the P87C51RC+4B,557 use?
The P87C51RC+4B,557 uses a 44-pin Plastic Quad Flat Pack (PQFP) with SOT307-2 mechanical drawing. This is explicitly defined in the "87C51RA+/RB+/RC+/RD+ AND 80C51RA+ ORDERING INFORMATION" table, where the "4B" suffix corresponds to the 44-pin PQFP variant rated for 0 to +70 °C operation and 2.7 V to 5.5 V supply.
How much internal RAM does the P87C51RC+4B,557 provide?
The P87C51RC+4B,557 provides 512 bytes of internal RAM, as documented in the family description table comparing memory sizes: "80C51RA+/8XC51RA+/RB+/RC+" specifies "512" under RAM Size (X by 8). This doubles the base 80C51's 256-byte RAM and supports deeper stacks, larger buffers, and more complex state machines than earlier derivatives.
Can the P87C51RC+4B,557 execute code from external memory?
Yes, the P87C51RC+4B,557 can execute code from external memory when the EA/VPP pin is held low, enabling access to up to 64 KB of external program memory. When EA is high, it executes solely from its internal 32 KB OTP - and will not fetch beyond 0x7FFF, as confirmed in the EA/VPP pin description stating "the device executes from internal program memory unless the program counter contains an address greater than 32k Devices (7FFFH)."
P87C51RC+4B,557 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Package/Case:
- 44-QFP
- Series:
- 87C
- Packaging:
- Tray
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Core Processor:
- 8051
- Core Size:
- 8-Bit
- Speed:
- 16MHz
- Connectivity:
- EBI/EMI, UART/USART
- Peripherals:
- POR, PWM, WDT
- Number of I/O:
- 32
- Program Memory Size:
- 32KB (32K 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:
P87C51RC+4B,557 FAQ
1.How can I place an order for P87C51RC+4B,557 through Aetrix?
Please submit a Request for Quotation (RFQ) for P87C51RC+4B,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 P87C51RC+4B,557 reliable?
The price and inventory of P87C51RC+4B,557 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for P87C51RC+4B,557 is usually 5 days.
3.What payment methods are accepted for P87C51RC+4B,557?
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4.How is shipping managed for P87C51RC+4B,557?
P87C51RC+4B,557 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your P87C51RC+4B,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 P87C51RC+4B,557?
For technical support, including P87C51RC+4B,557 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your P87C51RC+4B,557 requirements.
6.How does Aetrix verify that P87C51RC+4B,557 is sourced from the original manufacturer or authorized distributors?
All P87C51RC+4B,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 P87C51RC+4B,557 meets industry standards.
7.What is the process for return or replacement of P87C51RC+4B,557?
All P87C51RC+4B,557 units undergo pre-shipment inspection (PSI). If there is an issue with P87C51RC+4B,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 P87C51RC+4B,557 part is unused and in its original packaging.
Return procedure for P87C51RC+4B,557:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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