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NXP Semiconductors P87C51X2FA,512
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- Part No.:
- P87C51X2FA,512
- Manufacturer:
- NXP Semiconductors
- Category:
- Microcontrollers
- Package:
- 44-LCC (J-Lead)
- Datasheet:
-
P87C51X2FA,512.pdf
- Description:
- IC MCU 8BIT 4KB OTP 44PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:1,643
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Product details
Overview
P87C51X2FA,512 from NXP Semiconductors (formerly Philips) is a static 8-bit 80C51 microcontroller with 4 KB OTP ROM, 128 B RAM, three 16-bit timers/counters, full-duplex UART, and 32 I/O lines. It operates from 2.7 V to 5.5 V, supports both 6-clock and 12-clock modes (max 30/33 MHz), and features idle/power-down low-power modes - used in industrial control panels requiring deterministic timing and field-upgradable firmware.
For engineers reviewing the P87C51X2FA,512 datasheet, P87C51X2FA,512 pinout, P87C51X2FA,512 application, or P87C51X2FA,512 equivalent, key selection criteria include OTP-based firmware security, −40 °C to +85 °C extended temperature operation, PLCC44 package compatibility, and dual-clock mode configurability for timing-critical embedded systems.
Technical Context
This device implements a high-density CMOS 80C51 core with fully static operation, enabling clock stoppage without data loss. It integrates a programmable clock-out function on P1.0, Timer 2 with capture/compare capability, and asynchronous port reset - all accessible via standard 8051 SFRs including T2CON, CKCON, and AUXR.
The microcontroller supports two software-selectable power modes: idle mode (CPU halted, peripherals active) and power-down mode (oscillator frozen, RAM retained down to 2.0 V). Clock mode selection is controlled by both SFR bit CKCON.0 (X2) and OTP bit OX2, with the latter taking precedence when programmed.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Core Architecture | 80C51 8-bit CPU with Boolean processor and dual data pointer |
| Memory | 4 KB on-chip OTP ROM + 128 B RAM - enables secure, field-programmable firmware without external memory |
| Operating Voltage | 2.7 V to 5.5 V - supports battery-backed and wide-input industrial supplies |
| Max Clock Frequency | 30 MHz (6-clock) / 33 MHz (12-clock) at 5 V - delivers deterministic real-time response |
| Power Modes | Idle mode (CPU halted, peripherals running) and power-down mode (oscillator stopped, RAM retained) |
| Temperature Range | −40 °C to +85 °C - qualified for extended-temperature industrial environments |
| I/O Count | 32 bidirectional I/O lines across four 8-bit ports - sufficient for direct sensor/actuator interfacing |
Pinout & Package
Package: PLCC44 (SOT187-2), leaded chip carrier with 44 leads, body size 16.6 × 16.6 × 4.2 mm, suitable for socketed prototyping and high-reliability industrial PCBs.
| 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 - requires external pull-ups |
| P1.0/T2 | Port 1.0 / Timer 2 input | General-purpose I/O with alternate Timer 2 external count input or clock-out output |
| P2.0–P2.7 | Port 2 I/O / A8–A15 | Bidirectional port with internal pull-ups; outputs high-order address during external memory fetches |
| P3.0/RxD | Serial input | Full-duplex UART receive pin - supports RS-232 level-shifting with external transceiver |
| RST | Reset input | Active-high reset requiring ≥2 machine cycles; enables reliable power-on and watchdog recovery |
| XTAL1/XTAL2 | Oscillator inputs | Supports crystal (1–24 MHz), ceramic resonator, or external clock source - determines system timing base |
| EA/VPP | External access enable | High = execute from internal OTP; low = fetch code from external memory - controls boot source |
| ALE/PROG | Address latch enable | Outputs 1/6 (12-clock) or 1/3 (6-clock) oscillator frequency - used to latch P0 address/data |
Key Features
| Feature | Design Value |
|---|---|
| 6-/12-clock mode select | Configurable via CKCON.0 (SFR) or OTP bit OX2 - enables runtime clock scaling for latency vs. power trade-offs |
| Programmable clock-out | 50% duty cycle output on P1.0 (61 Hz–4 MHz @16 MHz, 12-clock) - eliminates need for external clock generator |
| Three 16-bit timers | T0/T1 standard 8051 timers + T2 with capture/compare - supports PWM generation, pulse measurement, and baud-rate generation |
| Security bits | 2-bit ROM protection + 3-bit OTP protection - prevents unauthorized firmware readout or reprogramming |
| Low EMI design | 6-clock mode, slew-rate-controlled outputs, and ALE inhibit - reduces radiated emissions in noise-sensitive environments |
Applications
| Industrial PLC I/O Module | Smart Sensor Node |
|---|---|
Use Scenario: Standalone digital I/O expansion module in factory automation, interfacing with 24 V DC sensors and solenoids via optocouplers. IC Role / Device Role / Timing Role: Primary controller executing ladder logic scan cycles, managing serial Modbus RTU communication, and servicing real-time interrupt-driven inputs. Use Value: 32 GPIO pins eliminate external I/O expanders; OTP ROM ensures certified firmware integrity; −40 °C to +85 °C rating matches panel-mount environmental requirements. | Use Scenario: Battery-powered environmental monitor collecting temperature, humidity, and CO₂ data for wireless transmission. IC Role / Device Role / Timing Role: System-on-chip host managing ADC sampling, UART telemetry, and low-power sleep scheduling between measurements. Use Value: Power-down mode draws µA-level current; internal 128 B RAM retains calibration data during sleep; 2.7 V minimum operation extends battery life. |
| Legacy Equipment Controller | Embedded HMI Front Panel |
Use Scenario: Retrofit controller replacing obsolete 8051-based boards in medical infusion pumps and laboratory instruments. IC Role / Device Role / Timing Role: Drop-in replacement executing legacy firmware with identical instruction timing and peripheral register mapping. Use Value: Pin-compatible with P80C51X2BN/DIP40 variants; OTP allows field updates without EPROM erasers; same SFR layout ensures binary compatibility. | Use Scenario: Keypad-and-LCD front panel for HVAC controllers, displaying status and accepting user configuration. IC Role / Device Role / Timing Role: Dedicated UI processor handling button debounce, LCD refresh, and serial command parsing from main MCU. Use Value: Full-duplex UART enables clean host communication; 4 KB OTP stores localized UI strings and graphics; PLCC44 simplifies hand-soldering during small-batch assembly. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 8-bit microcontroller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT89C51-24PI | 4 KB Flash (not OTP), 128 B RAM, 24 MHz max, DIP40 only | Lacks extended temperature grade and PLCC44 option; Flash enables unlimited reprogramming | Select for prototyping or low-volume production where reprogrammability outweighs industrial temp range |
| P89C51RD2FA | 64 KB Flash, 1024 B RAM, enhanced UART, 33 MHz, PLCC44 | Higher memory and peripherals but larger code footprint; not binary-compatible with 8051X2 SFR layout | Select for new designs needing scalable memory and USB-capable peripherals - not a drop-in replacement |
Compared with AT89C51-24PI and P89C51RD2FA, the P87C51X2FA,512 provides guaranteed OTP firmware security and −40 °C to +85 °C operation in PLCC44, making it uniquely suited for safety-critical industrial retrofits where flash endurance or extended peripherals are secondary to reliability and qualification.
Availability
P87C51X2FA,512 is available at Aetrix Electronics and suitable for industrial control systems, smart sensor nodes, legacy equipment upgrades, and embedded HMI front panels requiring stable component supply across long product lifecycles.
Supply support for P87C51X2FA,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-reliability automotive, industrial, and IoT semiconductor solutions.
The P87C51X2FA,512 belongs to the legacy 80C51 family designed for cost-sensitive, long-lifecycle industrial applications where OTP-based firmware security, extended temperature operation, and pin compatibility with classic 8051 toolchains are essential.
FAQ
What is the maximum operating frequency of the P87C51X2FA,512?
The P87C51X2FA,512 supports up to 30 MHz in 6-clock mode and 33 MHz in 12-clock mode when operated at 5 V ±10%. At lower supply voltages (2.7–5.5 V), the maximum frequency is limited to 16 MHz in both modes per the manufacturer's electrical specifications. This dual-mode capability allows designers to optimize for speed or power consumption based on system requirements.
Does the P87C51X2FA,512 include on-chip ROM or is it ROMless?
The P87C51X2FA,512 includes 4 KB of on-chip OTP (One-Time Programmable) ROM, as indicated by the "P87" prefix and "X2" suffix in its part number. It is not ROMless - unlike the P80C31X2 series. The OTP memory allows permanent firmware storage after programming, providing security against unauthorized readout via the two dedicated ROM security bits.
Which package and temperature grade does P87C51X2FA,512 use?
The P87C51X2FA,512 uses a PLCC44 package (SOT187-2) and is rated for the extended industrial temperature range of −40 °C to +85 °C, as confirmed by the "F" in the part number suffix. This makes it suitable for deployment in harsh environments such as factory floors, outdoor enclosures, and transportation equipment where commercial-grade parts would fail.
Can the P87C51X2FA,512 operate from a 3.3 V supply?
Yes, the P87C51X2FA,512 is fully specified to operate from 2.7 V to 5.5 V, including standard 3.3 V systems. At 3.3 V, its maximum clock frequency is 16 MHz in both 6-clock and 12-clock modes. The device maintains full functionality - including UART, timers, and I/O - across this voltage range, enabling seamless integration into mixed-voltage designs.
How is the clock mode (6-clock vs. 12-clock) selected on the P87C51X2FA,512?
Clock mode selection on the P87C51X2FA,512 is controlled by bit X2 (CKCON.0) and OTP bit OX2. When OX2 is erased, CKCON.0 = 0 selects 12-clock mode and CKCON.0 = 1 selects 6-clock mode. If OX2 is programmed (via parallel programmer), it forces 6-clock mode regardless of CKCON.0 - providing hardware-enforced timing consistency for production firmware.
P87C51X2FA,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
- Number of I/O:
- 32
- Program Memory Size:
- 4KB (4K x 8)
- Program Memory Type:
- OTP
- EEPROM Size:
- -
- RAM Size:
- 128 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:
P87C51X2FA,512 FAQ
1.How can I place an order for P87C51X2FA,512 through Aetrix?
Please submit a Request for Quotation (RFQ) for P87C51X2FA,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 P87C51X2FA,512 reliable?
The price and inventory of P87C51X2FA,512 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for P87C51X2FA,512 is usually 5 days.
3.What payment methods are accepted for P87C51X2FA,512?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for P87C51X2FA,512 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for P87C51X2FA,512?
P87C51X2FA,512 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your P87C51X2FA,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 P87C51X2FA,512?
For technical support, including P87C51X2FA,512 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your P87C51X2FA,512 requirements.
6.How does Aetrix verify that P87C51X2FA,512 is sourced from the original manufacturer or authorized distributors?
All P87C51X2FA,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 P87C51X2FA,512 meets industry standards.
7.What is the process for return or replacement of P87C51X2FA,512?
All P87C51X2FA,512 units undergo pre-shipment inspection (PSI). If there is an issue with P87C51X2FA,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 P87C51X2FA,512 part is unused and in its original packaging.
Return procedure for P87C51X2FA,512:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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