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NXP Semiconductors P87C54X2BA,512
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- Part No.:
- P87C54X2BA,512
- Manufacturer:
- NXP Semiconductors
- Category:
- Microcontrollers
- Package:
- 44-LCC (J-Lead)
- Datasheet:
-
P87C54X2BA,512.pdf
- Description:
- IC MCU 8BIT 16KB OTP 44PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:2,060
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Product details
Overview
P87C54X2BA,512 from NXP Semiconductors (formerly Philips) is a static 8-bit 80C51 microcontroller with 16 KB on-chip OTP ROM, 256 B RAM, three 16-bit timers/counters (T0/T1/T2), 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 targets embedded control in industrial instrumentation and legacy automation systems.
For engineers reviewing the P87C54X2BA,512 datasheet, P87C54X2BA,512 pinout, P87C54X2BA,512 application, or P87C54X2BA,512 equivalent, key selection criteria include OTP memory size, PLCC44 package compatibility, dual clock-mode flexibility, low-voltage operation down to 2.7 V, and power-down/idle mode support for energy-constrained deployments.
Technical Context
This device implements a fully static 80C51 CPU core with Philips' high-density CMOS process, enabling zero-frequency operation and deterministic stop/resume behavior. Its architecture includes dual data pointers, four interrupt priority levels, six interrupt sources, and an enhanced UART with framing error detection and automatic address recognition.
The P87C54X2BA,512 integrates Timer 2 with capture/compare capability and programmable clock-out functionality on P1.0, while supporting external memory expansion via multiplexed Port 0 (AD0–AD7) and Port 2 (A8–A15). Clock mode selection is controlled by both SFR bit CKCON.0 (X2) and OTP bit OX2, allowing runtime or factory-programmed 6-/12-clock configuration.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Core Architecture | 80C51-compatible static CPU with Boolean processor and dual data pointers |
| Memory | 16 KB on-chip OTP ROM + 256 B RAM; supports up to 64 KB external program/data memory |
| Max Clock Frequency | 30 MHz at 5 V (6-clock mode); 33 MHz at 5 V (12-clock mode); 16 MHz across full 2.7–5.5 V range |
| Power Modes | Idle mode (CPU halted, peripherals active) and Power-Down mode (oscillator stopped, RAM retained down to 2.0 V) |
| I/O & Peripherals | 32 configurable I/O lines across four ports; three 16-bit timers; full-duplex UART; programmable clock-out on P1.0 |
| Operating Voltage | 2.7 V to 5.5 V - enables direct interface with 3.3 V logic and legacy 5 V systems without level-shifting |
| Package | PLCC44 (SOT187-2), lead-free compatible, 0 °C to +70 °C industrial temperature range |
Pinout & Package
Package: Plastic Leaded Chip Carrier, 44-lead (PLCC44), SOT187-2, body size 16.6 × 16.6 × 3.9 mm, surface-mount compatible.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC (Pin 44) | Power supply input | Primary 2.7–5.5 V supply for all internal logic and I/O drivers; decoupling required near pin |
| VSS (Pin 22) | Ground reference | 0 V return path for digital and analog circuitry; must be low-impedance connection to system ground plane |
| P0.0–P0.7 (Pins 36–43) | Multiplexed AD bus | Open-drain bidirectional port; functions as lower 8-bit address/data bus during external memory access; requires external pull-ups |
| P1.0/T2 (Pin 2) | Timer 2 I/O / clock-out | Configurable as Timer 2 external count input or 50% duty-cycle clock output (61 Hz–4 MHz at 16 MHz osc.) |
| P2.0–P2.7 (Pins 24–31) | Upper address bus | Bidirectional port with internal pull-ups; outputs A8–A15 during 16-bit external memory accesses |
| P3.0/RxD (Pin 11) | Serial input | UART receive input; TTL/CMOS-compatible; supports multi-processor communication mode |
| P3.1/TxD (Pin 13) | Serial output | UART transmit output; full-duplex operation; framing error detection enabled in SCON register |
| RST (Pin 10) | Reset input | Active-high asynchronous reset; requires ≥2 machine cycles (24/12 osc. periods) with running oscillator |
| XTAL1 (Pin 15) | Oscillator input | Input to on-chip inverting amplifier; accepts crystal (1–33 MHz), ceramic resonator, or external clock source |
| XTAL2 (Pin 14) | Oscillator output | Output from inverting amplifier; left unconnected when using external clock drive on XTAL1 |
| EA/VPP (Pin 29) | External access enable | High = execute from internal OTP; low = fetch code from external memory below 0x4000 (16 KB boundary) |
| ALE/PROG (Pin 33) | Address latch enable | Outputs 1/6 (12-clock) or 1/3 (6-clock) oscillator frequency; pulses during external memory accesses to latch P0 address |
| PSEN (Pin 26) | Program store enable | Active-low strobe for external program memory reads; inactive during internal code execution |
Key Features
| Feature | Design Value |
|---|---|
| 6-/12-clock mode select | Runtime switchable via CKCON.0 (X2) bit; doubles instruction throughput in 6-clock mode without hardware change |
| Programmable clock-out | 50% duty cycle output on P1.0 with frequency programmable from 61 Hz to 4 MHz (12-clock) or 122 Hz to 8 MHz (6-clock) |
| Low-power static design | Zero-frequency operation supported; idle mode retains RAM/peripherals; power-down mode draws µA-level current |
| Enhanced UART | Full-duplex with framing error detection, automatic address recognition, and SMOD baud rate doubling |
| Security & protection | OTP security bits (3-bit lock), encryption array (64 bytes), and LPEP bit for sub-4 V current optimization |
| ONCE™ debug mode | On-circuit emulation entry via ALE-low + RST sequence; enables in-system debugging without socket removal |
Applications
| Industrial Control Panel | Legacy Automation Interface |
|---|---|
Use Scenario: Standalone panel controller managing relay banks, sensor inputs, and LED status indicators in factory floor equipment. IC Role / Device Role / Timing Role: Primary MCU executing ladder logic interpreter and real-time I/O scanning at 10–100 ms intervals. Use Value: 16 KB OTP provides sufficient space for firmware + lookup tables; PLCC44 allows easy rework in service; 2.7–5.5 V operation tolerates brownout conditions. | Use Scenario: Protocol bridge between RS-232 field devices and Modbus RTU master in aging SCADA infrastructure. IC Role / Device Role / Timing Role: UART-based serial protocol translator with software-configurable baud rates and parity handling. Use Value: Enhanced UART with framing error detection ensures robust communication over noisy industrial lines; 32 I/O lines support discrete signal conditioning. |
| Embedded Data Logger | Test Equipment Controller |
Use Scenario: Battery-powered environmental monitor logging temperature/humidity at 1-minute intervals using SPI ADC and EEPROM. IC Role / Device Role / Timing Role: Low-power host managing sensor polling, timestamping (via Timer 2), and nonvolatile storage writes. Use Value: Power-down mode reduces average current to <10 µA; internal 256 B RAM buffers readings between wake cycles; 16 KB OTP stores firmware + calibration constants. | Use Scenario: Benchtop instrument controller coordinating GPIB/RS-232 instruments, front-panel buttons, and LCD display updates. IC Role / Device Role / Timing Role: Real-time coordinator with precise timing for stimulus-response sequencing and user interface refresh. Use Value: Three independent 16-bit timers enable simultaneous PWM generation, UART timing, and UI debounce; dual data pointers accelerate memory transfers to display buffer. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 8-bit microcontroller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| P87C54X2BN | DIP40 package (SOT129-1); same OTP size, RAM, and peripheral set; no PLCC mechanical compatibility | Suitable for through-hole prototyping or legacy PCBs with DIP sockets; lacks surface-mount thermal/mechanical advantages | Select when board layout mandates DIP footprint or manual assembly is required. |
| P89C51RB2FA | Flash memory (64 KB), 1 KB RAM, enhanced peripherals (PCA, SPI, I²C), 5 V only; different SFR map and boot vector | Enables field firmware updates and richer connectivity but requires PCB redesign and firmware porting effort | Choose for new designs needing reprogrammability and expanded interfaces; not drop-in compatible. |
Compared with P87C54X2BN and P89C51RB2FA, the P87C54X2BA,512 offers verified OTP reliability in PLCC44 for long-lifecycle industrial deployments, whereas the DIP variant trades mountability for ease of replacement, and the Flash alternative sacrifices pin-compatibility for modern feature integration.
Availability
P87C54X2BA,512 is available at Aetrix Electronics and suitable for industrial control panels, legacy automation interfaces, and embedded data loggers requiring stable component supply across extended product lifecycles.
Supply support for P87C54X2BA,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-performance mixed-signal ICs for automotive, industrial, and communication applications.
The P87C54X2BA,512 belongs to the legacy 80C51 OTP microcontroller family designed for cost-sensitive, high-reliability embedded control where long-term availability and proven silicon stability are critical.
FAQ
What is the maximum operating frequency of the P87C54X2BA,512 at 3.3 V?
The P87C54X2BA,512 supports a maximum external clock frequency of 16 MHz across its full 2.7 V to 5.5 V operating range - including at 3.3 V. This is specified in the "Operating Mode vs. Power Supply" table (Page 6), where both 6-clock and 12-clock modes are capped at 16 MHz below 5 V. At 5 V, it achieves 30 MHz (6-clock) or 33 MHz (12-clock).
Does the P87C54X2BA,512 support in-system programming (ISP)?
No, the P87C54X2BA,512 does not support in-system programming. It uses one-time-programmable (OTP) ROM, which is programmed externally via a parallel programmer before mounting. Unlike Flash-based variants such as the P89C51Rx2 series, the P87C54X2BA,512 cannot be reprogrammed after soldering - firmware updates require physical device replacement.
Can the P87C54X2BA,512 operate from a 3.3 V supply while interfacing with 5 V peripherals?
Yes, the P87C54X2BA,512 operates reliably from 2.7 V to 5.5 V and features CMOS/TTL-compatible I/O. When powered at 3.3 V, its outputs meet TTL high-level minimum (2.4 V) and low-level maximum (0.4 V) thresholds, enabling safe interfacing with standard 5 V logic inputs. However, direct connection to 5 V outputs requires external level-shifting or clamping to avoid exceeding absolute maximum ratings on input pins.
How is the 6-clock/12-clock mode selected on the P87C54X2BA,512?
The P87C54X2BA,512 supports dual clock modes via two independent controls: the CKCON.0 (X2) bit in Special Function Register CKCON (address 0x8F), and the OTP bit OX2. Setting X2 = 1 selects 6-clock mode at runtime; setting X2 = 0 selects 12-clock mode. If OX2 is programmed (e.g., during factory OTP burn), it overrides the X2 bit and forces 6-clock mode regardless of software state.
What is the function of the NIC pins on the PLCC44 package of the P87C54X2BA,512?
The P87C54X2BA,512 PLCC44 package includes four No Internal Connection (NIC) pins: Pin 1, Pin 12, Pin 23, and Pin 34. These pins have no electrical connection to the die and must remain unconnected on the PCB. They serve mechanical stabilization and package symmetry purposes only - routing traces or applying voltage to them may cause latch-up or damage per the "Latch-Up Prevention" note on Page 11.
P87C54X2BA,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:
- 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:
P87C54X2BA,512 FAQ
1.How can I place an order for P87C54X2BA,512 through Aetrix?
Please submit a Request for Quotation (RFQ) for P87C54X2BA,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 P87C54X2BA,512 reliable?
The price and inventory of P87C54X2BA,512 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for P87C54X2BA,512 is usually 5 days.
3.What payment methods are accepted for P87C54X2BA,512?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for P87C54X2BA,512 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for P87C54X2BA,512?
P87C54X2BA,512 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your P87C54X2BA,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 P87C54X2BA,512?
For technical support, including P87C54X2BA,512 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your P87C54X2BA,512 requirements.
6.How does Aetrix verify that P87C54X2BA,512 is sourced from the original manufacturer or authorized distributors?
All P87C54X2BA,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 P87C54X2BA,512 meets industry standards.
7.What is the process for return or replacement of P87C54X2BA,512?
All P87C54X2BA,512 units undergo pre-shipment inspection (PSI). If there is an issue with P87C54X2BA,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 P87C54X2BA,512 part is unused and in its original packaging.
Return procedure for P87C54X2BA,512:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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