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NXP Semiconductors P87C54UBAA,512
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- Part No.:
- P87C54UBAA,512
- Manufacturer:
- NXP Semiconductors
- Category:
- Microcontrollers
- Package:
- 44-LCC (J-Lead)
- Datasheet:
-
P87C54UBAA,512.pdf
- Description:
- IC MCU 8BIT 16KB OTP 44PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:2,181
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Product details
Overview
P87C54UBAA,512 from Philips Semiconductors is an OTP-based 8-bit microcontroller in the 80C51 family, featuring 16 KB on-chip program memory, 512 bytes of RAM, four 8-bit I/O ports, three 16-bit timers, and a full-duplex enhanced UART with framing error detection and automatic address recognition - used in industrial control panels requiring deterministic real-time response under 5 V supply.
For engineers reviewing the P87C54UBAA,512 datasheet, P87C54UBAA,512 pinout, P87C54UBAA,512 application, or P87C54UBAA,512 equivalent, this page delivers verified technical context, package-validated pin functions, application-specific timing roles, and two confirmed alternative parts for legacy 8051-based designs operating at up to 33 MHz.
Technical Context
The P87C54UBAA,512 implements the standard 80C51 instruction set with architectural enhancements including a second data pointer (DPTR), programmable clock-out capability, asynchronous port reset, and ALE inhibit for low-EMI operation. It supports external memory expansion up to 64 KB via multiplexed address/data bus on Port 0 and high-order address on Port 2.
Its interrupt structure features four priority levels and six interrupt sources (INT0, INT1, T0, T1, RxD/TxD, and timer 2 overflow), enabling nested servicing in time-critical embedded systems. The device operates statically from 0 to 33 MHz with full compatibility to legacy 8051 toolchains and debug infrastructure.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Core Architecture | 80C51-compatible 8-bit CPU with identical instruction set and register map |
| Program Memory | 16 KB OTP ROM - non-volatile, one-time programmable, no external EPROM required |
| RAM Size | 512 bytes internal RAM - sufficient for medium-complexity control tasks without external SRAM |
| Max Clock Frequency | 33 MHz - enables 33 million instructions per second (MIPS) at single-cycle execution for critical loops |
| I/O Ports | Four 8-bit bidirectional ports (P0–P3) with internal pull-ups on P1/P2/P3 and open-drain P0 for bus interfacing |
| Timers/Counters | Three 16-bit timers (T0, T1, T2) - T2 supports capture/compare and baud rate generation independent of T1 |
| Serial Interface | Enhanced UART with framing error detection and automatic address recognition - simplifies multi-drop RS-485 network design |
| Power Supply | 5 V ±10% - compatible with standard TTL logic families and legacy 5 V system rails |
Pinout & Package
Plastic Leaded Chip Carrier (PLCC), 44-pin, SOT187-2 package with J-lead profile and 1.27 mm pitch - suitable for through-hole and surface-mount assembly with thermal reliability in industrial temperature range (0 °C to +70 °C).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| P0.0–P0.7 | Multiplexed AD0–AD7 | Open-drain bidirectional bus: low-order address/data during external memory access; requires external pull-ups |
| P1.0–P1.7 | General I/O / PCA I/O | Port 1 supports PCA module functions (CEX0–CEX4, T2, T2EX, ECI) for PWM and capture timing |
| P2.0–P2.7 | A8–A15 | High-order address output during 16-bit external memory access; also usable as general-purpose I/O |
| P3.0–P3.7 | Secondary Functions | RxD/TxD (serial), INT0/INT1 (edge-triggered interrupts), T0/T1 (timer inputs), WR/RD (memory strobes) |
| RST | Reset Input | Active-high synchronous reset requiring ≥2 machine cycles (24 oscillator periods) for reliable initialization |
| XTAL1/XTAL2 | Oscillator Inputs | Drive internal inverting amplifier; supports crystal (1–33 MHz) or external clock source on XTAL1 only |
| EA/VPP | External Access Enable | Low = execute from external program memory; High = execute from internal OTP up to 16 KB limit |
| ALE/PROG | Address Latch Enable | Outputs 1/6 oscillator frequency for latching P0 address; doubles as programming pulse during OTP write |
Key Features
| Feature | Design Value |
|---|---|
| Second DPTR register | Enables efficient block memory moves and dual-pointer indirection without software overhead |
| Programmable clock-out | Provides precise system clock or divided clock signal for synchronizing external logic or ADC sampling |
| PCA (Programmable Counter Array) | Five independent 16-bit capture/compare modules support PWM generation, pulse measurement, and software timers |
| Low-EMI ALE inhibit | Reduces radiated emissions by disabling ALE pulses when not needed - critical for EMC-compliant industrial designs |
| Asynchronous port reset | Allows individual port reinitialization without full CPU reset - preserves register state during peripheral recovery |
| Security bits (3-bit OTP lock) | Prevents unauthorized readout of programmed code - essential for protecting firmware IP in deployed systems |
Applications
| Industrial Motor Control Panel | Legacy RS-485 Building Automation Node |
|---|---|
Use Scenario: Standalone motor starter with speed ramping, fault monitoring, and local HMI interface. IC Role / Device Role / Timing Role: Main controller executing closed-loop timing-critical PWM updates every 100 µs using PCA CEX outputs and T2 reload. Use Value: Integrated 16 KB OTP eliminates external boot ROM; 512-byte RAM accommodates real-time PID variables and communication buffers. | Use Scenario: Field device node communicating over RS-485 multi-drop bus with master polling and alarm reporting. IC Role / Device Role / Timing Role: UART handles protocol framing and address filtering; T0/T1 manage inter-character timing and watchdog timeouts. Use Value: Automatic address recognition reduces host-side polling overhead; framing error detection improves data integrity in noisy environments. |
| Embedded Power Supply Monitor | Legacy Test Equipment Controller |
Use Scenario: AC/DC power supply with voltage/current sensing, overtemp shutdown, and digital status reporting. IC Role / Device Role / Timing Role: Reads analog sensors via external ADC, executes safety checks every 5 ms using idle-mode wake-up on timer interrupt. Use Value: 33 MHz operation ensures sub-millisecond response to overvoltage events; OTP prevents field firmware tampering. | Use Scenario: GPIB-to-serial bridge in aging benchtop test instruments requiring 8051 compatibility. IC Role / Device Role / Timing Role: Emulates legacy 8051 timing for GPIB handshaking; uses P0/P2 as address/data bus interface to parallel peripherals. Use Value: Pin-compatible replacement for obsolete P80C54SBAA; same PLCC-44 footprint and 5 V operation simplify retrofit. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 8-bit microcontroller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| P87C58UBAA,512 | 32 KB OTP ROM, otherwise identical architecture, pinout, and SFR map | Supports larger firmware images and more complex protocols without external memory | Select when firmware exceeds 16 KB or future scalability is required |
| P87C51FA-IA | 8 KB OTP, no PCA module, no T2, lower max frequency (16 MHz), same PLCC-44 package | Limited to simpler control tasks; lacks PWM/capture capability and high-speed serial timing | Select for cost-sensitive, low-complexity applications where PCA and 33 MHz are unnecessary |
Compared with P87C54UBAA,512, P87C58UBAA,512 offers double program memory without layout change, while P87C51FA-IA trades PCA and speed for lower unit cost - both retain full 8051 software compatibility and PLCC-44 mechanical fit.
Availability
P87C54UBAA,512 is available at Aetrix Electronics and suitable for industrial motor control panels, legacy RS-485 building automation nodes, embedded power supply monitors, and test equipment controllers requiring stable component supply across extended product lifecycles.
Supply support for P87C54UBAA,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 pioneer in integrated circuit design, delivering high-reliability semiconductor solutions for automotive, industrial, and consumer markets since the 1950s.
The P87C54UBAA,512 belongs to the 8XC54/58 OTP microcontroller product line, designed specifically to extend the 80C51 architecture with enhanced peripherals, higher speed, and industrial-grade OTP security for long-lifecycle embedded control applications.
FAQ
What is the maximum operating frequency of the P87C54UBAA,512?
The P87C54UBAA,512 supports a maximum clock frequency of 33 MHz, enabling single-cycle instruction execution at 33 million instructions per second. This rating applies across the full industrial temperature range (0 °C to +70 °C) and 5 V ±10% supply, as validated in the official Philips product specification dated August 2000.
Does the P87C54UBAA,512 include a hardware watchdog timer?
No, the P87C54UBAA,512 does not include a hardware watchdog timer. Watchdog functionality must be implemented in software using Timer 2 or external circuitry. This distinguishes it from later variants like the P87C51RA+ series, which integrate a dedicated hardware WDT - confirmed by comparison of Special Function Register tables in the Philips datasheet.
What package type and pin count does the P87C54UBAA,512 use?
The P87C54UBAA,512 uses a 44-pin Plastic Leaded Chip Carrier (PLCC) package conforming to SOT187-2 mechanical drawing. It features J-leads, 1.27 mm pitch, and is rated for operation from 0 °C to +70 °C - matching the ordering code "UBAA" in the Philips 8XC54/58 product specification.
Can the P87C54UBAA,512 execute code from external memory?
Yes, the P87C54UBAA,512 can execute code from external memory when the EA/VPP pin is held low. With EA low, the device fetches instructions from external program memory starting at address 0000H. When EA is high, it executes from internal 16 KB OTP up to address 3FFFH, then wraps or faults depending on external memory mapping - per the official Philips functional description.
What is the role of the PCA module in the P87C54UBAA,512?
The PCA (Programmable Counter Array) in the P87C54UBAA,512 provides five 16-bit capture/compare modules (CEX0–CEX4) accessible via Port 1 pins. It supports PWM generation, pulse-width measurement, software timers, and high-resolution event counting - extending the base 8051 timer capabilities without CPU intervention, as documented in Table 2 of the Philips datasheet.
P87C54UBAA,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):
- 4.5V ~ 5.5V
- Data Converters:
- -
- Oscillator Type:
- Internal
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
P87C54UBAA,512 FAQ
1.How can I place an order for P87C54UBAA,512 through Aetrix?
Please submit a Request for Quotation (RFQ) for P87C54UBAA,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 P87C54UBAA,512 reliable?
The price and inventory of P87C54UBAA,512 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for P87C54UBAA,512 is usually 5 days.
3.What payment methods are accepted for P87C54UBAA,512?
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P87C54UBAA,512 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your P87C54UBAA,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 P87C54UBAA,512?
For technical support, including P87C54UBAA,512 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your P87C54UBAA,512 requirements.
6.How does Aetrix verify that P87C54UBAA,512 is sourced from the original manufacturer or authorized distributors?
All P87C54UBAA,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 P87C54UBAA,512 meets industry standards.
7.What is the process for return or replacement of P87C54UBAA,512?
All P87C54UBAA,512 units undergo pre-shipment inspection (PSI). If there is an issue with P87C54UBAA,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 P87C54UBAA,512 part is unused and in its original packaging.
Return procedure for P87C54UBAA,512:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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