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NXP Semiconductors P87C51X2BA,512
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- Part No.:
- P87C51X2BA,512
- Manufacturer:
- NXP Semiconductors
- Category:
- Microcontrollers
- Package:
- 44-LCC (J-Lead)
- Datasheet:
-
P87C51X2BA,512.pdf
- Description:
- IC MCU 8BIT 4KB OTP 44PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:4,356
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Product details
Overview
P87C51X2BA,512 from Philips Semiconductors is a static 8-bit 80C51 microcontroller with 4 KB on-chip OTP ROM, 128 B RAM, and full 32-pin I/O capability. It operates from 2.7 V to 5.5 V, supports both 6-clock and 12-clock modes (up to 30/33 MHz), and features three 16-bit timers, full-duplex UART, and dual power-saving modes - ideal for industrial control and embedded instrumentation requiring low-voltage reliability.
For engineers reviewing the P87C51X2BA,512 datasheet, P87C51X2BA,512 pinout, P87C51X2BA,512 application, or P87C51X2BA,512 equivalent, key selection criteria include OTP memory size, PLCC44 package compatibility, 128 B RAM capacity, 6-/12-clock mode software selectability, and wake-up-from-power-down via external interrupt support.
Technical Context
This device implements a high-density CMOS static 80C51 core with fully compatible instruction set and SFR layout. It integrates an on-chip oscillator, programmable clock-out on P1.0, and enhanced UART with framing error detection and automatic address recognition.
Power management includes idle mode (CPU halted, peripherals active) and power-down mode (oscillator stopped, RAM retained down to 2.0 V). Clock control is configurable via CKCON.X2 bit and OTP OX2 bit, enabling runtime switching between 6-clock (2× speed) and 12-clock operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Core Architecture | 80C51-compatible static CPU with Boolean processor and dual data pointers |
| Memory | 4 KB on-chip OTP ROM + 128 B RAM - no external program memory required for basic firmware |
| Operating Voltage | 2.7 V to 5.5 V - supports battery-backed and wide-input industrial supplies |
| Max Clock Frequency | 30 MHz at 6-clock mode / 33 MHz at 12-clock mode (5 V); 16 MHz at both modes (2.7–5.5 V) |
| Timers/Counters | Three 16-bit timers (T0, T1, T2) - T2 supports capture, compare, and programmable clock-out |
| Serial Interface | Full-duplex UART with framing error detection and automatic address recognition - enables multi-drop bus systems |
| Power Modes | Idle mode (CPU halted, RAM/timers/UART active) and power-down mode (oscillator off, RAM retained) |
Pinout & Package
Package: PLCC44 (SOT187-2), plastic leaded chip carrier, 44 leads, 0 °C to +70 °C operating range.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| P0.0–P0.7 | Port 0 bidirectional I/O / AD0–AD7 multiplexed bus | Open-drain port used for external memory addressing/data transfer; requires external pull-ups in bus mode |
| P1.0/T2 | Port 1.0 / Timer 2 external count input or clock-out | Configurable as T2 input or 50% duty-cycle clock output (61 Hz–4 MHz @16 MHz osc) |
| P1.1/T2EX | Port 1.1 / Timer 2 reload/capture control | Enables capture mode, reload trigger, or direction control for T2 in auto-reload mode |
| P2.0–P2.7 | Port 2 bidirectional I/O / A8–A15 high-order address | Provides upper address byte during 16-bit external memory accesses |
| P3.0/RxD | Port 3.0 / UART serial input | Asynchronous receive pin with Schmitt-trigger input for noise immunity |
| P3.1/TxD | Port 3.1 / UART serial output | Full-duplex transmit pin; output driver strength supports standard RS-232 level shifters |
| P3.2/INT0 | Port 3.2 / External interrupt 0 input | Level-sensitive or edge-triggered interrupt source; supports wake-up from power-down |
| P3.4/T0 & P3.5/T1 | Timer 0/1 external count inputs | Edge-triggered inputs for event counting or external clock synchronization |
| RST | Reset input | Active-high reset requiring ≥2 machine cycles; internal pull-down enables capacitor-based POR |
| XTAL1/XTAL2 | Oscillator input/output | Supports crystal (1–24 MHz), ceramic resonator, or external clock drive |
| EA/VPP | External access enable / programming voltage | High = execute from internal OTP; low = fetch from external memory; 12.75 V during OTP programming |
| ALE/PROG | Address latch enable / programming pulse | Outputs 1/6 (12-clock) or 1/3 (6-clock) oscillator rate; disabled via AUXR.0 for timing-critical apps |
Key Features
| Feature | Design Value |
|---|---|
| 6-/12-clock mode selectability | Runtime switchable via CKCON.X2 bit - doubles instruction throughput without hardware change |
| Programmable clock-out on P1.0 | Generates precise 50% duty-cycle clocks (61 Hz–8 MHz) for sensor sync or peripheral timing |
| Enhanced UART with auto-address recognition | Reduces host polling overhead in multi-node networks by filtering addressed frames in hardware |
| Wake-up from power-down via INT0/INT1 | Enables ultra-low-power sleep with deterministic, sub-10 ms wake latency using level-sensitive interrupts |
| OTP security bits and encryption array | 3-bit OTP lock + 64-byte encryption array prevent firmware reverse engineering and unauthorized reprogramming |
| ONCE™ on-circuit emulation mode | Allows real-time debugging without socket removal - ALE+RST sequence activates emulator interface |
Applications
| Industrial PLC I/O Module | Smart Sensor Node |
|---|---|
Use Scenario: Standalone digital I/O expansion unit with serial command interface in factory automation cabinets. IC Role / Device Role / Timing Role: Main controller executing ladder logic interpreter and managing 32-channel GPIO, UART comms, and timer-based PWM outputs. Use Value: 4 KB OTP stores compact runtime firmware; 128 B RAM holds I/O state and protocol buffers; PLCC44 allows robust through-hole mounting in vibration-prone environments. |
Use Scenario: Battery-powered temperature/humidity node transmitting data over RS-485 to gateway every 30 seconds. IC Role / Device Role / Timing Role: System-on-chip managing ADC sampling, UART framing, low-power scheduling, and wake-up triggers. Use Value: Power-down mode draws <10 µA; 2.7 V minimum operation extends battery life; UART auto-addressing simplifies multi-node addressing. |
| Embedded HMI Keypad Controller | Legacy Equipment Retrofit Board |
Use Scenario: Front-panel keypad scanner and display driver for medical device UI with tactile feedback. IC Role / Device Role / Timing Role: Real-time scan controller interfacing matrix keypad, driving LED segments, and communicating status via UART. Use Value: Three 16-bit timers manage independent scan intervals, debounce timing, and LED refresh; 32 I/O lines eliminate external port expanders. |
Use Scenario: Drop-in replacement for obsolete 8051-based motion controller in CNC retrofit kits. IC Role / Device Role / Timing Role: Pin-compatible upgrade providing same footprint, timing, and firmware compatibility with enhanced OTP security. Use Value: Identical DIP40/PLCC44 packaging and 80C51 instruction set ensures zero-code-change migration; OTP prevents unauthorized firmware updates. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 8-bit microcontroller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| P80C51X2BA | 4 KB mask ROM instead of OTP; no field-programmable capability; identical pinout and timing | Fixed firmware only - suitable for high-volume, unchanging designs where OTP reprogrammability is unnecessary | Select when firmware is finalized and cost-per-unit optimization outweighs field update flexibility |
| P87C52X2BA | 8 KB OTP ROM + 256 B RAM; otherwise identical architecture, package, and peripheral set | Supports larger firmware images and more complex state machines without external memory expansion | Select when application logic exceeds 4 KB or requires >128 B working RAM for buffering or stack depth |
Compared with P80C51X2BA and P87C52X2BA, the P87C51X2BA,512 uniquely balances field-programmable OTP storage, low-voltage operation down to 2.7 V, and PLCC44 ruggedness - making it optimal for mid-volume industrial controllers needing secure, updatable firmware in harsh environments.
Availability
P87C51X2BA,512 is available at Aetrix Electronics and suitable for industrial PLC modules, smart sensor nodes, embedded HMI controllers, and legacy equipment retrofit programs requiring stable component supply across extended product lifecycles.
Supply support for P87C51X2BA,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 leader in high-reliability mixed-signal ICs, with deep heritage in 8-bit microcontroller design and industrial-grade process technology.
The P87C5xX2 family was engineered for cost-sensitive, long-lifecycle embedded systems demanding OTP security, wide voltage operation, and proven 80C51 compatibility - especially in factory automation and instrumentation.
FAQ
What is the maximum operating frequency of the P87C51X2BA,512?
The P87C51X2BA,512 supports up to 30 MHz in 6-clock mode and 33 MHz in 12-clock mode at 5 V ±10%. At 2.7–5.5 V supply, the maximum frequency is 16 MHz in both modes. The actual achievable speed depends on VCC level and clock mode configuration via CKCON.X2 or OTP OX2 bit.
Does the P87C51X2BA,512 support in-system programming?
No, the P87C51X2BA,512 uses one-time-programmable (OTP) ROM and requires parallel programming via dedicated programmer before soldering. It does not support ISP or bootloader-based updates. Programming occurs at VPP = 12.75 V applied to EA/VPP pin during parallel write cycles.
Can the P87C51X2BA,512 operate from a 3.3 V supply?
Yes, the P87C51X2BA,512 is fully specified for 2.7 V to 5.5 V operation. At 3.3 V, it delivers reliable performance up to 16 MHz in either 6- or 12-clock mode, making it suitable for mixed-voltage systems and battery-powered applications.
How many interrupt sources does the P87C51X2BA,512 support?
The P87C51X2BA,512 supports six interrupt sources: two external (INT0, INT1), two timer (TF0, TF1), one serial (RI/TI), and one Timer 2 overflow/capture (TF2/EXF2). All are configurable across four priority levels with nested interrupt handling enabled.
What package options are available for the P87C51X2BA,512?
The P87C51X2BA,512 is offered exclusively in PLCC44 (SOT187-2) package, rated for 0 °C to +70 °C operation. Other variants like P87C51X2BN use DIP40, and P87C51X2BBD use LQFP44 - but P87C51X2BA,512 specifically denotes the PLCC44 variant.
P87C51X2BA,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:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
P87C51X2BA,512 FAQ
1.How can I place an order for P87C51X2BA,512 through Aetrix?
Please submit a Request for Quotation (RFQ) for P87C51X2BA,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 P87C51X2BA,512 reliable?
The price and inventory of P87C51X2BA,512 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for P87C51X2BA,512 is usually 5 days.
3.What payment methods are accepted for P87C51X2BA,512?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for P87C51X2BA,512 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for P87C51X2BA,512?
P87C51X2BA,512 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your P87C51X2BA,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 P87C51X2BA,512?
For technical support, including P87C51X2BA,512 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your P87C51X2BA,512 requirements.
6.How does Aetrix verify that P87C51X2BA,512 is sourced from the original manufacturer or authorized distributors?
All P87C51X2BA,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 P87C51X2BA,512 meets industry standards.
7.What is the process for return or replacement of P87C51X2BA,512?
All P87C51X2BA,512 units undergo pre-shipment inspection (PSI). If there is an issue with P87C51X2BA,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 P87C51X2BA,512 part is unused and in its original packaging.
Return procedure for P87C51X2BA,512:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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