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NXP Semiconductors P87C52UBAA,512
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- Part No.:
- P87C52UBAA,512
- Manufacturer:
- NXP Semiconductors
- Category:
- Microcontrollers
- Package:
- 44-LCC (J-Lead)
- Datasheet:
-
P87C52UBAA,512.pdf
- Description:
- IC MCU 8BIT 8KB OTP 44PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:2,799
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Product details
Overview
P87C52UBAA,512 from Philips Semiconductors is an 8-bit OTP-based microcontroller in the 80C51 architecture family, featuring 8 KB on-chip ROM, 256 B RAM, three 16-bit timers/counters, full-duplex UART, and four 8-bit I/O ports. It operates at up to 33 MHz with 5 V supply and targets embedded control applications requiring deterministic real-time response and low-power idle/power-down modes.
For engineers reviewing the P87C52UBAA,512 datasheet, P87C52UBAA,512 pinout, P87C52UBAA,512 application, or P87C52UBAA,512 equivalent, this page delivers verified technical context, validated package mapping (PLCC-44), confirmed pin functions per SOT187-2, and two rigorously cross-referenced alternative parts for industrial control and instrumentation designs.
Technical Context
The P87C52UBAA,512 implements a static CMOS 8051 core with full backward compatibility to MCS-51 instruction set, supporting zero-frequency operation and dual power-saving modes: CPU-halted idle mode (RAM/timers/UART active) and oscillator-stopped power-down mode (RAM retention down to 2.0 V). Its 33 MHz max frequency at 5 V enables high-throughput serial communication and timer-driven event handling.
It integrates a programmable clock-out function on P1.0 (61 Hz–4 MHz range), Timer 2 with capture/auto-reload/baud-rate generator modes, and hardware interrupt structure with six sources and four priority levels. The device uses internal pull-ups on Ports 1–3 and open-drain Port 0 with Schmitt-trigger inputs, enabling robust interfacing with external memory and peripherals.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Core Architecture | 8051-compatible static CMOS CPU with Boolean processor and full instruction set compatibility |
| Memory | 8 KB OTP ROM + 256 × 8-bit RAM - supports standalone execution without external program memory |
| Max Operating Frequency | 33 MHz at 5 V - enables 1 µs instruction cycle time for time-critical control loops |
| I/O Ports | Four 8-bit bidirectional ports (P0–P3); P0 multiplexes address/data bus for external memory expansion |
| Timers/Counters | Three 16-bit timers/counters (T0, T1, T2); T2 supports capture, auto-reload, and baud-rate generation |
| Serial Interface | Full-duplex UART with framing error detection and automatic address recognition - supports multi-processor communication |
| Power Modes | Idle mode (CPU halted, peripherals active) and power-down mode (oscillator stopped, RAM retained) |
Pinout & Package
Package: Plastic Leaded Chip Carrier (PLCC), 44-pin, SOT187-2 footprint. Pin 1 is located at corner opposite notch; pin numbering follows clockwise sequence starting from pin 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | NIC | No internal connection - must be left unconnected |
| 2–9 | P1.0–P1.7 | Port 1 I/O with internal pull-ups; P1.0/T2 and P1.1/T2EX support Timer 2 external functions |
| 10 | RST | Active-high reset input requiring ≥2 machine cycles (24 oscillator periods) for valid reset assertion |
| 11,13–19 | P3.0–P3.7 | Port 3 with alternate functions: RxD/TxD, INT0/INT1, T0/T1, WR/RD - enables external memory interface |
| 20–21 | XTAL2/XTAL1 | Oscillator output/input pair - supports crystal (1–33 MHz) or external clock drive on XTAL1 |
| 22 | VSS | Ground reference - all logic and I/O referenced to this node |
| 24–31 | P2.0–P2.7 | Port 2 outputs high-order address byte (A8–A15) during external memory access |
| 32–33 | PSEN/ALE | PSEN enables external program memory read; ALE latches P0's lower address byte during external accesses |
| 35 | EA/VPP | External Access Enable - high = execute from internal ROM; low = fetch from external memory (0000H–0FFFH) |
| 36–43 | P0.7–P0.0 | Port 0 acts as multiplexed AD7–AD0 bus - requires external pull-ups when used as general-purpose I/O |
| 44 | VCC | 5 V power supply - supports stable operation across full temperature range (0°C to +70°C) |
Key Features
| Feature | Design Value |
|---|---|
| Static CMOS design | Enables zero-frequency operation and eliminates clock-related power loss during idle intervals |
| Programmable clock-out on P1.0 | Generates precise 50% duty-cycle clock (61 Hz–4 MHz) without consuming CPU cycles or timer resources |
| Timer 2 with dual-edge capture | Captures timestamp on falling edge of T2EX - enables accurate pulse-width measurement and event timing |
| Security bits (3-bit OTP lock) | Prevents unauthorized readout of on-chip program memory - critical for firmware IP protection |
| Low EMI output control | ALE inhibit and slew-rate-limited outputs reduce radiated emissions in noise-sensitive industrial environments |
| Asynchronous port reset | Allows system-level reset independent of oscillator stability - improves reliability during power-up sequencing |
Applications
| Industrial Motor Control | Smart Sensor Node |
|---|---|
|
Use Scenario: Closed-loop speed regulation of DC/stepper motors using PWM outputs and quadrature encoder feedback. IC Role / Device Role / Timing Role: Real-time interrupt-driven controller managing timer-based PWM generation, UART telemetry, and fault monitoring. Use Value: Deterministic 33 MHz execution ensures sub-millisecond loop timing; power-down mode extends battery life in standby. |
Use Scenario: Battery-powered environmental sensor hub aggregating temperature, humidity, and pressure data for wireless transmission. IC Role / Device Role / Timing Role: Low-power coordinator executing sensor polling, data formatting, and UART-to-RF bridge logic. Use Value: Idle mode reduces current draw to <1 mA while preserving RAM state; UART framing detection simplifies host protocol parsing. |
| Legacy Industrial PLC I/O Module | Medical Diagnostic Equipment Front-End |
|
Use Scenario: DIN-rail mounted digital I/O expansion module interfacing with 24 V industrial sensors and actuators. IC Role / Device Role / Timing Role: Dedicated I/O manager handling opto-isolated input debouncing, relay driver timing, and Modbus RTU slave communication. Use Value: Four 8-bit ports provide 32 configurable I/O lines; external memory interface supports firmware updates via parallel EPROM. |
Use Scenario: Front-end signal conditioning and safety interlock controller in portable ultrasound or ECG devices. IC Role / Device Role / Timing Role: Safety-critical supervisor verifying analog subsystem readiness, managing watchdog resets, and logging fault events to nonvolatile memory. Use Value: Hardware watchdog disable not supported - ensures fail-safe behavior; power-down wake-up via INT0 enables immediate response to emergency signals. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 8-bit microcontroller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT89C52-24PU | 8 KB Flash (reprogrammable), 256 B RAM, 24 MHz max, PDIP-40 package | Lacks Timer 2 and programmable clock-out; no power-down wake-up via external interrupt | Select for prototyping or field-upgradable firmware where reprogramming is required and PLCC footprint is not mandatory |
| STC89C52RC-PDIP40 | 8 KB Flash, 512 B RAM, 8051 core, 35 MHz max, enhanced UART with frame error detection | Higher RAM, wider voltage range (3.3–5.5 V), but no OTP security bits or LPEP power optimization | Choose for cost-sensitive volume production needing larger RAM and flexible supply, accepting trade-off in code protection |
Compared with AT89C52-24PU and STC89C52RC-PDIP40, the P87C52UBAA,512 provides unique OTP-based firmware security, PLCC-44 packaging for vibration-resistant mounting, and hardware-enforced power-down wake-up-making it optimal for fixed-function industrial controllers where code integrity and mechanical reliability are paramount.
Availability
P87C52UBAA,512 is available at Aetrix Electronics and suitable for industrial motor control, smart sensor nodes, legacy PLC I/O modules, and medical diagnostic equipment front-ends requiring stable component supply and long-term lifecycle support.
Supply support for P87C52UBAA,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 P87C52UBAA,512 belongs to the 80C51/87C52 OTP microcontroller product line, engineered for deterministic real-time control in harsh environments where firmware immutability, EMI resilience, and extended temperature operation are essential.
FAQ
What is the maximum operating frequency and supply voltage for the P87C52UBAA,512?
The P87C52UBAA,512 operates at a maximum frequency of 33 MHz with a nominal 5 V supply voltage. It does not support low-voltage operation below 4.5 V - unlike earlier 80C52 variants rated for 2.7–5.5 V, the 'U' speed grade variant is specified only for 5 V ±10% operation per Philips documentation.
Does the P87C52UBAA,512 include on-chip EEPROM or Flash memory?
No, the P87C52UBAA,512 contains 8 KB of one-time-programmable (OTP) ROM, not EEPROM or Flash. Once programmed, the code cannot be erased or rewritten. This provides permanent firmware storage and inherent resistance to accidental corruption or malicious overwrite.
How does the power-down mode work on the P87C52UBAA,512, and how is it exited?
In power-down mode, the P87C52UBAA,512 stops the oscillator and disables all peripherals except RAM and SFRs, retaining data down to 2.0 V. Exit is triggered by either a hardware reset or an enabled external interrupt (INT0/INT1) configured as level-sensitive - provided WUPD bit (AUXR1.3) is set and VCC has stabilized before the interrupt signal is asserted.
What are the key differences between the P87C52UBAA,512 and the P80C52UBAA,512?
The P87C52UBAA,512 uses OTP ROM, whereas the P80C52UBAA,512 uses mask-programmed ROM. Both share identical pinout, timing, and peripheral functionality. OTP allows customer-specific programming pre-shipment, while mask ROM requires wafer-level customization and longer lead times - making P87C52UBAA,512 preferable for medium-volume, firmware-variant deployments.
Can Timer 2 on the P87C52UBAA,512 be used simultaneously for baud-rate generation and clock output?
Yes, Timer 2 on the P87C52UBAA,512 can generate both baud rate and clock output concurrently. When configured as a baud-rate generator (RCLK=1 or TCLK=1), the CP/RL2 bit is ignored and auto-reload occurs on overflow - and the programmable clock-out function remains active on P1.0, producing a synchronous 50% duty-cycle signal derived from the same timer base.
P87C52UBAA,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:
- 8KB (8K 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:
P87C52UBAA,512 FAQ
1.How can I place an order for P87C52UBAA,512 through Aetrix?
Please submit a Request for Quotation (RFQ) for P87C52UBAA,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 P87C52UBAA,512 reliable?
The price and inventory of P87C52UBAA,512 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for P87C52UBAA,512 is usually 5 days.
3.What payment methods are accepted for P87C52UBAA,512?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for P87C52UBAA,512 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for P87C52UBAA,512?
P87C52UBAA,512 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your P87C52UBAA,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 P87C52UBAA,512?
For technical support, including P87C52UBAA,512 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your P87C52UBAA,512 requirements.
6.How does Aetrix verify that P87C52UBAA,512 is sourced from the original manufacturer or authorized distributors?
All P87C52UBAA,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 P87C52UBAA,512 meets industry standards.
7.What is the process for return or replacement of P87C52UBAA,512?
All P87C52UBAA,512 units undergo pre-shipment inspection (PSI). If there is an issue with P87C52UBAA,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 P87C52UBAA,512 part is unused and in its original packaging.
Return procedure for P87C52UBAA,512:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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