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NXP Semiconductors P87C52SBAA,512
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- Part No.:
- P87C52SBAA,512
- Manufacturer:
- NXP Semiconductors
- Category:
- Microcontrollers
- Package:
- 44-LCC (J-Lead)
- Datasheet:
-
P87C52SBAA,512.pdf
- Description:
- IC MCU 8BIT 8KB OTP 44PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:3,194
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Product details
Overview
P87C52SBAA,512 from Philips Semiconductors is an 8-bit OTP-based microcontroller in the 80C51 architecture family, featuring 8 KB ROM, 256 B RAM, three 16-bit timers/counters, full-duplex UART, and four 8-bit I/O ports. It operates at up to 16 MHz across 2.7–5.5 V and supports idle and power-down modes for low-power embedded control in industrial instrumentation and legacy automation systems.
For engineers reviewing the P87C52SBAA,512 datasheet, P87C52SBAA,512 pinout, P87C52SBAA,512 application, or P87C52SBAA,512 equivalent, this page delivers verified technical context, package-specific pin mapping, real-world use cases, and validated alternative options - all grounded in the official Philips 2000 product specification.
Technical Context
The P87C52SBAA,512 implements a static CMOS 8051 core with full backward compatibility to MCS-51 instruction set, supporting zero-frequency operation and software-selectable power modes. Its memory architecture includes 64 KB addressable program space and 64 KB external data space, with dual data pointers enabling efficient memory transfers.
It integrates a six-source, four-priority nested interrupt system, programmable clock-out on P1.0 (61 Hz–4 MHz), and Timer 2 configured for capture, auto-reload (up/down), or baud-rate generation - independent of Timer 1 when RCLK/TCLK are enabled. The UART supports framing error detection and automatic address recognition in multi-processor mode.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Core Architecture | 8051-compatible static CMOS CPU with Boolean processor and full instruction set compatibility |
| ROM Size | 8 KB OTP (One-Time Programmable) - non-volatile program storage without external EPROM socket |
| RAM Size | 256 × 8-bit on-chip RAM - sufficient for stack, variables, and small buffers without external SRAM |
| Max Clock Frequency | 16 MHz at 2.7–5.5 V - enables deterministic real-time response within 1 µs instruction cycle (12-clock mode) |
| I/O Ports | Four 8-bit bidirectional ports (P0–P3) with Schmitt-trigger inputs and internal pull-ups on P1/P2/P3 |
| Timers/Counters | Three 16-bit timers: T0/T1 standard, T2 with capture/reload/baud-rate modes - supports precise timing and serial communication |
| Serial Interface | Full-duplex UART with framing error detection and multi-processor address recognition - eliminates need for external protocol logic |
| Power Modes | Idle mode (CPU halted, peripherals active) and power-down mode (oscillator stopped, RAM retained down to 2.0 V) |
Pinout & Package
Package: Plastic Leaded Chip Carrier (PLCC), 44-pin, SOT187-2 footprint, lead-free compatible per Philips specification.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| P0.0–P0.7 | Open-drain bidirectional I/O / AD0–AD7 | Multiplexed address/data bus for external memory access; requires external pull-ups for port functionality |
| P1.0–P1.7 | Bidirectional I/O with internal pull-ups | P1.0/T2 and P1.1/T2EX support Timer 2 capture/reload; no external pull-up needed for input use |
| P2.0–P2.7 | Bidirectional I/O / A8–A15 | High-order address bus during 16-bit external memory access; emits P2 register value during 8-bit MOVX |
| P3.0–P3.7 | Bidirectional I/O with alternate functions | RxD/TxD (serial), INT0/INT1 (level-sensitive interrupts), T0/T1 (timer inputs), WR/RD (memory strobes) |
| XTAL1/XTAL2 | Oscillator input/output | Supports crystal (1–16 MHz), ceramic resonator, or external clock drive; enables stable timing without external oscillator IC |
| RST | Active-high reset input | Two-machine-cycle high pulse required; internal weak pull-down allows RC-based power-on reset circuit |
| EA/VPP | External access enable / programming voltage | Low = execute from external ROM; high = execute from internal OTP unless PC exceeds 0x1FFF; 12.75 V required for OTP programming |
| ALE/PROG | Address latch enable / programming pulse | Outputs 1/6 oscillator frequency for external latch sync; doubles as EPROM programming pulse when PROG active |
| PSEN | Program store enable output | Strobe for external program memory read; inactive during internal code fetch - prevents bus contention |
Key Features
| Feature | Design Value |
|---|---|
| Static CMOS design | Enables true zero-power stop-clock operation - critical for battery-backed or energy-harvesting systems |
| Four-level priority interrupt system | Allows deterministic handling of time-critical events (e.g., sensor sampling, motor commutation) without polling overhead |
| Timer 2 with up/down auto-reload | Supports precise PWM generation or quadrature decoding using T2EX pin as direction control - no firmware timer scaling needed |
| Programmable clock-out on P1.0 | Generates clean 50% duty-cycle clocks (61 Hz–4 MHz @ 16 MHz) for synchronizing external logic or ADC sampling |
| Security bits (3-bit OTP lock) | Prevents unauthorized readout of programmed firmware - essential for IP protection in OEM control modules |
| Low EMI design | Configurable ALE inhibit and slew-rate-controlled outputs reduce radiated emissions in noise-sensitive industrial environments |
Applications
| Industrial PLC I/O Module | Legacy Automotive Body Controller |
|---|---|
Use Scenario: Standalone digital input/output expansion module interfacing with 24 V sensors and solenoids via optocouplers and level shifters. IC Role / Device Role / Timing Role: Primary controller executing ladder logic scan, managing serial comms to master PLC, and driving local I/O with deterministic timing. Use Value: On-chip UART and three timers eliminate external UART IC and timing ICs; 256 B RAM suffices for state tables and scan buffers. | Use Scenario: Seat/mirror position memory and window lift control in pre-CAN vehicles using discrete wiring and LIN-like protocols over UART. IC Role / Device Role / Timing Role: Real-time actuator sequencing engine with EEPROM-emulated NVM via OTP write-once configuration storage. Use Value: Power-down mode extends battery life during vehicle sleep; internal 8 KB OTP stores calibrated position maps without external memory. |
| Medical Infusion Pump Controller | Smart Energy Meter Firmware Host |
Use Scenario: Safety-critical dosing controller requiring fail-safe watchdog-free operation and predictable interrupt latency. IC Role / Device Role / Timing Role: Core safety monitor executing motor step timing, occlusion detection, and alarm logic with hardware timer precision. Use Value: Static design ensures no clock drift; idle mode reduces thermal load during standby without losing sensor state in RAM. | Use Scenario: Firmware host for metrology ASICs in Class 0.5S electricity meters, managing display, tamper logging, and IR/RS-485 comms. IC Role / Device Role / Timing Role: Application coordinator handling time-of-use billing, secure data logging, and communication protocol translation. Use Value: Dual data pointer accelerates flash update routines; security bits prevent firmware tampering in field-deployed units. |
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, same 40-pin DIP pinout but different PLCC layout; max 24 MHz | Requires PCB redesign for PLCC-to-DIP; supports firmware updates in-system, unlike OTP-limited P87C52SBAA,512 | Select when field firmware revision capability is mandatory and PLCC footprint can be adapted |
| STC89C52RC-PD | 8 KB Flash, 512 B RAM, enhanced UART with frame error detection, 3.3–5.5 V operation, 8051-compatible ISA | Higher RAM enables larger protocol stacks; lacks OTP security bits but adds ISP via UART - no programmer needed | Select for new designs needing cost-effective reprogrammability and extended peripheral features without OTP lock-in |
Compared with AT89C52-24PU and STC89C52RC-PD, the P87C52SBAA,512 offers guaranteed OTP firmware integrity and proven industrial temperature stability (0°C to +70°C), but lacks in-system reprogrammability - making it optimal for fixed-function, high-reliability deployments where firmware never changes post-manufacture.
Availability
P87C52SBAA,512 is available at Aetrix Electronics and suitable for industrial PLC modules, legacy automotive body controllers, medical infusion pump logic, and smart energy meter firmware hosting requiring stable component supply and long-term obsolescence management.
Supply support for P87C52SBAA,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 Dutch semiconductor pioneer known for foundational 8-bit MCU architectures and industrial-grade reliability.
The 80C51/87C51/80C52/87C52 family was designed for cost-sensitive, high-volume embedded control applications demanding low power, static operation, and full 8051 software compatibility - especially in industrial automation and automotive subsystems.
FAQ
What is the maximum operating frequency of the P87C52SBAA,512?
The P87C52SBAA,512 supports a maximum operating frequency of 16 MHz across its specified 2.7–5.5 V supply range. This is confirmed in the Philips ordering information table for the SBAA variant (S = 16 MHz). Unlike the U-series variants (e.g., P87C52UBAA), it does not support 33 MHz operation - attempting higher frequencies may cause timing violations or functional failure.
Does the P87C52SBAA,512 include internal RAM, and how much is available?
Yes, the P87C52SBAA,512 includes 256 × 8-bit on-chip RAM, as explicitly stated in the Philips selection table and features list. This RAM is fully accessible during idle mode and retained in power-down mode down to 2.0 V. It is distinct from the 8 KB OTP program memory and serves as working memory for stack, registers, and user variables - sufficient for basic control tasks without external SRAM.
Can the P87C52SBAA,512 be used with an external crystal oscillator?
Yes, the P87C52SBAA,512 supports external crystal oscillators connected between XTAL1 and XTAL2 pins, as detailed in the oscillator characteristics section. Crystals from 1 MHz to 16 MHz are supported. Alternatively, XTAL1 can accept an external clock signal while XTAL2 remains unconnected - with no duty-cycle requirement, though minimum high/low time specs must be met per the datasheet.
What power-saving modes does the P87C52SBAA,512 support, and how do they differ?
The P87C52SBAA,512 supports two software-selectable low-power modes: idle mode (CPU halted, RAM/timers/UART/interrupts remain active) and power-down mode (oscillator stopped, RAM contents preserved down to 2.0 V). Idle mode allows fast wake-up via any enabled interrupt; power-down requires either hardware reset or external interrupt (INT0/INT1, level-sensitive) to resume - with WUPD bit in AUXR1 controlling interrupt wake-up enable.
Is the P87C52SBAA,512 pin-compatible with other 80C52 variants like the P80C52SBAA?
Yes, the P87C52SBAA,512 shares identical pinout, package (PLCC-44, SOT187-2), and electrical interface with the ROM-based P80C52SBAA. Both use the same pin configuration diagram and share identical port mappings, oscillator, reset, and memory control signals - enabling direct substitution where OTP programmability is required instead of mask ROM.
P87C52SBAA,512 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Package/Case:
- 44-LCC (J-Lead)
- Series:
- 87C
- Packaging:
- Tube
- Product Status:
- Obsolete
- Programmable:
- Verified
- Core Processor:
- 8051
- Core Size:
- 8-Bit
- Speed:
- 16MHz
- 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):
- 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:
P87C52SBAA,512 FAQ
1.How can I place an order for P87C52SBAA,512 through Aetrix?
Please submit a Request for Quotation (RFQ) for P87C52SBAA,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 P87C52SBAA,512 reliable?
The price and inventory of P87C52SBAA,512 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for P87C52SBAA,512 is usually 5 days.
3.What payment methods are accepted for P87C52SBAA,512?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for P87C52SBAA,512 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for P87C52SBAA,512?
P87C52SBAA,512 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your P87C52SBAA,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 P87C52SBAA,512?
For technical support, including P87C52SBAA,512 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your P87C52SBAA,512 requirements.
6.How does Aetrix verify that P87C52SBAA,512 is sourced from the original manufacturer or authorized distributors?
All P87C52SBAA,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 P87C52SBAA,512 meets industry standards.
7.What is the process for return or replacement of P87C52SBAA,512?
All P87C52SBAA,512 units undergo pre-shipment inspection (PSI). If there is an issue with P87C52SBAA,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 P87C52SBAA,512 part is unused and in its original packaging.
Return procedure for P87C52SBAA,512:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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