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NXP Semiconductors P87C51FB-4A,512
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- Part No.:
- P87C51FB-4A,512
- Manufacturer:
- NXP Semiconductors
- Category:
- Microcontrollers
- Package:
- 44-LCC (J-Lead)
- Datasheet:
-
P87C51FB-4A,512.pdf
- Description:
- IC MCU 8BIT 16KB OTP 44PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:2,840
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Product details
Overview
P87C51FB-4A,512 from Philips Semiconductors is an 8-bit OTP microcontroller based on the 80C51 architecture, featuring 16KB ROM, 256B RAM, programmable PCA (Programmable Counter Array), and full-duplex enhanced UART. It operates at up to 16 MHz across 2.7–5.5 V supply, supporting motor control, industrial I/O, and embedded instrumentation where pulse-width modulation and high-speed event capture are required.
For engineers reviewing the P87C51FB-4A,512 datasheet, P87C51FB-4A,512 pinout, P87C51FB-4A,512 application, or P87C51FB-4A,512 equivalent, key selection criteria include its 44-pin PLCC package, PCA-based timer/event capture capability, OTP security bit configuration, and compatibility with legacy 80C51 toolchains and interrupt structure.
Technical Context
The P87C51FB-4A,512 implements a static CMOS 80C51 core with identical instruction set compatibility and four priority-level nested interrupts. Its PCA module provides five independent capture/compare channels (CEX0–CEX4) driven by ECI input, enabling precise PWM generation and time-stamped event logging without CPU intervention.
It supports external memory expansion up to 64KB via multiplexed AD0–AD7 and A8–A15 address bus, with dedicated WR/RD strobes and PSEN control. The enhanced UART includes framing error detection and automatic address recognition for multiprocessor communication in distributed control systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Core Architecture | 80C51-compatible 8-bit CPU with identical instruction set and SFR mapping |
| Memory | 16KB OTP program memory + 256B on-chip RAM; supports 64KB external addressing |
| Max Clock Frequency | 16 MHz at 2.7–5.5 V - enables deterministic real-time response within 62.5 ns instruction cycle |
| PCA Module | 5-channel programmable counter array with capture/compare/PWM modes and ECI clock input |
| UART | Full-duplex enhanced serial port with framing error detection and automatic address recognition |
| Power Modes | Idle mode (CPU halted, peripherals active) and Power-down mode (oscillator stopped, RAM retained) |
| I/O Ports | Four 8-bit bidirectional ports (P0–P3); P0/P2 serve dual role for external memory interface |
Pinout & Package
Package: 44-pin Plastic Leaded Chip Carrier (PLCC), SOT187-2 footprint, lead-free compatible per manufacturer specification.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| P1.0/T2 | Timer 2 external count input / clock output | Enables hardware timer synchronization or external event counting without software overhead |
| P1.1/T2EX | Timer 2 reload/capture/direction control | Supports auto-reload, edge-triggered capture, and up/down counter direction control |
| P1.2/ECI | External clock input to PCA | Provides independent timing source for PCA module, decoupling from system clock |
| P1.3–P1.7 (CEX0–CEX4) | Capture/Compare I/O for PCA modules 0–4 | Each pin supports rising/falling edge capture, compare-match output, or PWM waveform generation |
| P3.0/RxD, P3.1/TxD | Serial data input/output | Full-duplex UART interface with framing error detection and multiprocessor address recognition |
| P3.6/WR, P3.7/RD | External data memory write/read strobes | Direct control of external SRAM or peripheral devices using standard 80C51 bus protocol |
| EA/VPP | External access enable / programming voltage | When high, executes from internal OTP; when low, fetches code from external memory starting at 0000H |
Key Features
| Feature | Design Value |
|---|---|
| Programmable PCA with 5 channels | Enables simultaneous PWM generation, input capture, and time-stamped event logging without CPU polling |
| Enhanced UART with address recognition | Reduces software overhead in multi-node RS-485 networks by filtering addressed frames in hardware |
| OTP security bits (3-bit configuration) | Prevents unauthorized readout of firmware by locking program memory after programming |
| Second DPTR register (DPS bit) | Allows efficient indirect addressing of two separate external memory banks without software pointer swapping |
| Asynchronous port reset | Permits individual port initialization during runtime without full device reset, improving system robustness |
Applications
| Motor Control System | Industrial Data Logger |
|---|---|
Use Scenario: Closed-loop DC motor speed regulation using feedback from optical encoder and PWM-driven H-bridge. IC Role / Device Role / Timing Role: Primary controller executing PID algorithm, generating synchronized PWM outputs (via CEX0–CEX4), and capturing encoder pulses (via ECI/CEX inputs). Use Value: Hardware PCA eliminates CPU load from timing-critical PWM and capture tasks, ensuring jitter-free 16-bit resolution motor control at 20 kHz switching frequency. | Use Scenario: Standalone environmental sensor node recording temperature, humidity, and pressure at fixed intervals to local EEPROM and SD card. IC Role / Device Role / Timing Role: Central data acquisition unit managing analog front-end ADCs, SPI/I²C peripherals, and timed storage writes using PCA-based interval timers. Use Value: Idle-mode power management and PCA-driven periodic wake-up reduce average current to <100 µA, enabling 5-year battery life on CR2032. |
| Legacy Industrial PLC I/O Module | RS-485 Fieldbus Node |
Use Scenario: Retrofit replacement for aging 8051-based I/O expansion module in programmable logic controller rack. IC Role / Device Role / Timing Role: Firmware-compatible drop-in controller handling discrete input scanning, relay output latching, and watchdog supervision. Use Value: Pin-compatible PLCC package and identical SFR layout allow PCB reuse; OTP ensures field-programmable firmware updates without EPROM erasers. | Use Scenario: Distributed sensor node communicating over long-haul RS-485 bus in factory automation network. IC Role / Device Role / Timing Role: Protocol handler implementing Modbus RTU slave with hardware-assisted address filtering and CRC generation. Use Value: Enhanced UART's automatic address recognition offloads 30% of CPU cycles from frame parsing, enabling concurrent analog sampling and diagnostics. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 8-bit microcontroller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| P87C51FA-4A | 8KB OTP, same 44-pin PLCC package, identical PCA and UART features, but reduced program memory | Suitable for simpler control tasks with smaller firmware footprints; lacks capacity for complex communication stacks or large lookup tables | Select when firmware size ≤8 KB and cost sensitivity outweighs memory headroom needs |
| P87C51RB+-4A | 16KB OTP + 512B RAM + hardware watchdog timer; otherwise identical peripheral set and pinout | Required for safety-critical applications needing periodic reset supervision; adds 256B extra RAM for larger buffers or stack depth | Select when watchdog supervision or extended RAM for multitasking context switching is mandatory |
Compared with P87C51FA-4A, the P87C51FB-4A,512 provides double program memory for feature-rich firmware while maintaining identical timing, I/O, and development tool compatibility; versus P87C51RB+-4A, it trades watchdog and extra RAM for lower cost and unchanged 256B RAM allocation optimized for deterministic real-time execution.
Availability
P87C51FB-4A,512 is available at Aetrix Electronics and suitable for industrial control systems, legacy equipment upgrades, and embedded instrumentation requiring stable component supply, long-term lifecycle support, and direct 80C51 firmware compatibility.
Supply support for P87C51FB-4A,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
Philips Semiconductors (now NXP Semiconductors) is a global semiconductor leader founded in the Netherlands, specializing in high-reliability mixed-signal ICs for automotive, industrial, and consumer applications.
The P87C51FB-4A,512 belongs to the 8XC51FA/FB/FC OTP microcontroller product line, designed specifically for cost-sensitive, high-volume industrial control applications requiring proven 80C51 compatibility, low-voltage operation, and hardware-accelerated timing functions.
FAQ
What is the maximum operating frequency of the P87C51FB-4A,512?
The P87C51FB-4A,512 supports a maximum clock frequency of 16 MHz when operated within its specified 2.7–5.5 V supply range. This yields a 62.5 ns instruction cycle time for all single-cycle 80C51 instructions. Operation above 16 MHz is not guaranteed and violates the device's AC electrical specifications per the official Philips product specification document dated August 2000.
Does the P87C51FB-4A,512 include a hardware watchdog timer?
No, the P87C51FB-4A,512 does not integrate a hardware watchdog timer. That feature is present only in the 8XC51RA+/RB+/RC+/RD+ family variants (e.g., P87C51RB+-4A). The P87C51FB-4A,512 relies on software-based timeout supervision or external watchdog ICs for system reliability assurance.
What package type and pin count does the P87C51FB-4A,512 use?
The P87C51FB-4A,512 is supplied in a 44-pin Plastic Leaded Chip Carrier (PLCC) package, designated SOT187-2 in Philips' ordering nomenclature. This surface-mount package features a square body with J-leads and is compatible with standard PLCC socketing or reflow assembly processes.
How much on-chip RAM does the P87C51FB-4A,512 provide?
The P87C51FB-4A,512 integrates 256 bytes of on-chip RAM, mapped identically to the standard 80C51 architecture. This includes 128 bytes of general-purpose RAM and 128 bytes of bit-addressable special function register (SFR) space. External RAM expansion up to 64KB is supported via the multiplexed address/data bus.
Is the P87C51FB-4A,512 pin-compatible with other members of the 8XC51FA/FB/FC family?
Yes, the P87C51FB-4A,512 is fully pin-compatible with all 44-pin PLCC variants in the 8XC51FA/FB/FC family (e.g., P87C51FA-4A, P87C51FC-4A), sharing identical pin functions, electrical characteristics, and package dimensions. Firmware and hardware designs can be reused across these variants with only OTP memory size differing.
P87C51FB-4A,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:
- 16MHz
- Connectivity:
- EBI/EMI, UART/USART
- Peripherals:
- POR, PWM
- Number of I/O:
- 32
- Program Memory Size:
- 16KB (16K x 8)
- Program Memory Type:
- OTP
- EEPROM Size:
- -
- RAM Size:
- 256 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:
P87C51FB-4A,512 FAQ
1.How can I place an order for P87C51FB-4A,512 through Aetrix?
Please submit a Request for Quotation (RFQ) for P87C51FB-4A,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 P87C51FB-4A,512 reliable?
The price and inventory of P87C51FB-4A,512 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for P87C51FB-4A,512 is usually 5 days.
3.What payment methods are accepted for P87C51FB-4A,512?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for P87C51FB-4A,512 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for P87C51FB-4A,512?
P87C51FB-4A,512 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your P87C51FB-4A,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 P87C51FB-4A,512?
For technical support, including P87C51FB-4A,512 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your P87C51FB-4A,512 requirements.
6.How does Aetrix verify that P87C51FB-4A,512 is sourced from the original manufacturer or authorized distributors?
All P87C51FB-4A,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 P87C51FB-4A,512 meets industry standards.
7.What is the process for return or replacement of P87C51FB-4A,512?
All P87C51FB-4A,512 units undergo pre-shipment inspection (PSI). If there is an issue with P87C51FB-4A,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 P87C51FB-4A,512 part is unused and in its original packaging.
Return procedure for P87C51FB-4A,512:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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