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NXP Semiconductors P87C52SBBB,557
- Part No.:
- P87C52SBBB,557
- Manufacturer:
- NXP Semiconductors
- Category:
- Microcontrollers
- Package:
- 44-QFP
- Datasheet:
-
P87C52SBBB,557.pdf
- Description:
- IC MCU 8BIT 8KB OTP 44PQFP
- Quantity:
- Payment:
- Shipping:
Inventory:3,305
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Product details
Overview
P87C52SBBB,557 from NXP Semiconductors (formerly Philips) 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 16 MHz across 2.7–5.5 V supply, supporting industrial control, sensor interface, and legacy embedded systems requiring static operation and low-power idle/power-down modes.
For engineers reviewing the P87C52SBBB,557 datasheet, P87C52SBBB,557 pinout, P87C52SBBB,557 application, or P87C52SBBB,557 equivalent, this page delivers verified technical context, validated pin functions for PQFP-44 package, real-world use cases in serial communication and timer-critical control, and two confirmed alternative parts with documented functional and packaging differences.
Technical Context
The P87C52SBBB,557 implements a static CMOS 8051 core with full backward compatibility to MCS-51 instruction set, enabling direct code reuse from legacy 80C51/87C51 designs. Its memory map supports 64 KB program and 64 KB data address space, with on-chip 8 KB OTP ROM mapped to internal program memory when EA/VPP is high.
It integrates dual data pointers, 4-level nested interrupt priority with six sources (INT0, INT1, T0, T1, serial, T2), and Timer 2 configured as auto-reload, capture, or baud-rate generator - independent of Timer 1. Power management includes software-selectable idle mode (CPU halted, peripherals active) and power-down mode (oscillator stopped, RAM retained down to 2.0 V).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Core Architecture | 8051-compatible 8-bit CPU with Boolean processor and static design - enables zero-frequency operation and deterministic timing for real-time control loops. |
| Memory | 8 KB × 8 OTP ROM + 256 × 8 RAM - sufficient for standalone firmware without external program memory in cost-sensitive applications. |
| Timers/Counters | Three 16-bit timers: T0/T1 standard, T2 with capture/auto-reload/baud-rate modes - supports simultaneous UART baud generation and event timing without resource conflict. |
| Serial Interface | Full-duplex UART with framing error detection and automatic address recognition - enables multi-drop RS-485 networks and protocol-aware communication. |
| Supply Voltage | 2.7 V to 5.5 V at ≤16 MHz - allows direct interfacing with 3.3 V logic and battery-powered operation while maintaining TTL/CMOS compatibility. |
| Power Modes | Idle mode (CPU halted, RAM/timers/UART active) and power-down mode (oscillator off, RAM retained) - reduces system power to µA range during sleep intervals. |
| Package | Plastic Quad Flat Pack (PQFP), 44-pin, SOT307-2 footprint - surface-mount compatible with standard reflow profiles and 0.8 mm lead pitch. |
Pinout & Package
Package: Plastic Quad Flat Pack (PQFP), 44-pin, SOT307-2, body size 10 mm × 10 mm, 0.8 mm lead pitch, lead finish SnPb.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| P0.0–P0.7 (AD0–AD7) | Multiplexed address/data bus / I/O port | Open-drain outputs with internal pull-ups; used for external memory access (ALE-latched) or general-purpose I/O; requires external pull-ups for reliable high-level output. |
| P1.0–P1.7 | General-purpose I/O port with alternate functions | P1.0/T2 and P1.1/T2EX support Timer 2 capture/reload/external clock input; all pins have Schmitt-trigger inputs and internal pull-ups for noise-immune digital sensing. |
| P2.0–P2.7 (A8–A15) | High-order address bus / I/O port | Outputs upper address byte during 16-bit external memory accesses; retains latch value during 8-bit MOVX @Ri operations - enables flexible memory mapping. |
| P3.0–P3.7 | Multi-function I/O port with dedicated signals | RxD/TxD (serial), INT0/INT1 (edge/level-triggered interrupts), T0/T1 (timer inputs), WR/RD (external memory strobes) - provides hardware-assisted peripheral control without software overhead. |
| XTAL1 / XTAL2 | Oscillator input/output | Supports crystal (1–16 MHz), ceramic resonator, or external clock drive; internal inverter enables self-contained timing with minimal external components. |
| RST | Active-high reset input | Requires ≥2 machine cycles (24 oscillator periods) high pulse; internal weak pull-down permits RC-based power-on reset - eliminates need for dedicated reset IC in simple designs. |
| EA/VPP | External access enable / programming voltage | Low = execute from external ROM; high = execute from internal OTP unless PC exceeds 0x1FFF; also accepts 12.75 V for OTP programming - defines boot source and enables field reprogramming. |
| ALE/PROG | Address latch enable / programming pulse | Emits 1/6 oscillator frequency for external latch timing; disabled via AUXR.0 to reduce EMI; doubles as EPROM programming pulse - supports both runtime and development workflows. |
Key Features
| Feature | Design Value |
|---|---|
| Static CMOS core | Enables true zero-frequency operation and instant resume from stop-clock mode - critical for battery-backed systems and deterministic real-time response. |
| Timer 2 with dual-edge capture | Records timestamp of external events (e.g., encoder edges, pulse widths) with 16-bit resolution and hardware-triggered store into RCAP2H/L - eliminates CPU polling overhead. |
| Programmable clock-out on P1.0 | Generates 61 Hz–4 MHz square wave (at 16 MHz OSC) for driving external logic, ADC sampling clocks, or test instrumentation - no additional oscillator required. |
| Security bits & encryption array | 3-bit OTP security lock prevents readout of on-chip code; 64-byte encryption array deters reverse engineering - protects firmware IP in production devices. |
| Low-EMI I/O design | Configurable slew-rate control and ALE inhibit reduce radiated emissions - simplifies EMC compliance for industrial and medical equipment. |
Applications
| Industrial PLC I/O Module | Legacy Serial Device Gateway |
|---|---|
|
Use Scenario: Standalone I/O expansion node in distributed control systems, reading discrete sensors and driving relays via optocoupled interfaces. IC Role / Device Role / Timing Role: Primary controller executing ladder logic scan cycle; uses Timer 0 for 10 ms task scheduling and UART for Modbus RTU master/slave communication. Use Value: On-chip 8 KB OTP eliminates external memory, reducing BOM cost and PCB area; 256 B RAM suffices for register mapping and status buffers in Modbus frame handling. |
Use Scenario: Protocol translator bridging RS-232 legacy instruments to RS-485 industrial networks with address filtering and data buffering. IC Role / Device Role / Timing Role: UART-centric controller using RCLK/TCLK bits to assign Timer 2 for precise 9600/19200 baud rates while servicing interrupts from both serial ports. Use Value: Hardware UART with framing error detection ensures robust data integrity; dual DPTR enables efficient buffer management between two serial streams. |
| Power Meter Firmware Controller | Embedded Test Fixture Sequencer |
|
Use Scenario: Energy metering unit performing pulse counting (from kWh meter LED), LCD display refresh, and tamper detection via GPIO monitoring. IC Role / Device Role / Timing Role: Real-time supervisor using INT1 for edge-triggered pulse capture and Timer 1 for 1-second timebase; low-power idle mode extends battery life in portable units. Use Value: Wake-up from power-down via external interrupt allows µA-level standby current; internal 256 B RAM preserves accumulated pulse count across sleep cycles. |
Use Scenario: Automated test station sequencing relay closures, reading DMM outputs, and logging pass/fail results over UART to host PC. IC Role / Device Role / Timing Role: Deterministic sequencer relying on Timer 2 auto-reload mode for precise 50 ms step delays and P3.6/P3.7 for hardware-controlled WR/RD strobes to external test logic. Use Value: Dedicated WR/RD pins eliminate bit-banged timing uncertainty; 4-level interrupt priority ensures timely response to test fault signals without jitter. |
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 (1,000 write/erase cycles), same 44-pin PDIP package, 24 MHz max, no T2EX/T2 capture | Limited to Flash-based prototyping; lacks Timer 2 capture capability and programmable clock-out on P1.0 | Select for rapid firmware iteration where reprogramming in-system is required, but avoid if hardware timestamping or external clock generation is needed. |
| STC89C52RC-PDIP40 | 8 KB Flash, 40-pin DIP, 5 V only, integrated MAX232-level UART drivers, no PQFP option | Requires level-shifting for 3.3 V systems; incompatible pinout prevents drop-in replacement in PQFP-44 layouts | Choose for cost-sensitive 5 V designs with simplified serial interface, but verify PCB footprint and voltage compatibility before substitution. |
Compared with AT89C52-24PU and STC89C52RC-PDIP40, the P87C52SBBB,557 offers OTP security, PQFP-44 packaging for space-constrained boards, and unique Timer 2 capture functionality - making it irreplaceable in applications requiring tamper-resistant firmware and precise external event timestamping.
Availability
P87C52SBBB,557 is available at Aetrix Electronics and suitable for industrial control, legacy serial device integration, and embedded test fixture applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant sourcing.
Supply support for P87C52SBBB,557 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-reliability automotive, industrial, and secure connectivity solutions with decades of microcontroller heritage.
The P87C52SBBB,557 belongs to the legacy 80C51/87C51 family designed for cost-effective, low-power embedded control in industrial automation, instrumentation, and maintenance-critical systems where long-term availability and proven silicon reliability are essential.
FAQ
What is the maximum operating frequency of the P87C52SBBB,557?
The P87C52SBBB,557 is rated for up to 16 MHz operation when supplied at 2.7–5.5 V, as specified in the Philips product specification document dated 2000 Aug 07. It does not support the 33 MHz speed grade - that applies only to the 'U' suffix variants (e.g., P87C52UBAA). Exceeding 16 MHz may result in undefined behavior or timing violations.
Does the P87C52SBBB,557 support in-system programming (ISP)?
No, the P87C52SBBB,557 contains One-Time Programmable (OTP) ROM and does not support in-system programming. Programming must be performed using a dedicated EPROM programmer prior to soldering. The VPP pin (EA/VPP) accepts 12.75 V only during initial OTP programming - repeated application will not reprogram the device.
What is the function of the T2EX pin on the P87C52SBBB,557?
On the P87C52SBBB,557, the T2EX pin (P1.1) serves as the external reload/capture control input for Timer 2. When EXEN2=1, a falling edge on T2EX triggers either capture of TL2/TH2 into RCAP2L/RCAP2H or reload from those registers - enabling hardware-synchronized event timestamping or gated timing without CPU intervention.
Can the P87C52SBBB,557 operate from a 3.3 V supply?
Yes, the P87C52SBBB,557 is fully specified for 2.7 V to 5.5 V operation, including 3.3 V nominal supply. At 3.3 V, its maximum guaranteed operating frequency is 16 MHz per the datasheet, and all I/O pins remain TTL/CMOS compatible - allowing direct interfacing with 3.3 V peripherals without level shifters.
How many interrupt sources does the P87C52SBBB,557 support?
The P87C52SBBB,557 supports six interrupt sources: INT0 and INT1 (external), T0 and T1 (timer overflows), serial port (RI/TI), and TF2 (Timer 2 overflow). These are managed through a four-level nested priority structure controlled by the IP and IE registers - enabling prioritized response to time-critical events in real-time applications.
P87C52SBBB,557 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Package/Case:
- 44-QFP
- Series:
- 87C
- Packaging:
- Tray
- Product Status:
- Obsolete
- Programmable:
- Not 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:
P87C52SBBB,557 FAQ
1.How can I place an order for P87C52SBBB,557 through Aetrix?
Please submit a Request for Quotation (RFQ) for P87C52SBBB,557 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 P87C52SBBB,557 reliable?
The price and inventory of P87C52SBBB,557 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for P87C52SBBB,557 is usually 5 days.
3.What payment methods are accepted for P87C52SBBB,557?
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P87C52SBBB,557 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your P87C52SBBB,557 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 P87C52SBBB,557?
For technical support, including P87C52SBBB,557 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your P87C52SBBB,557 requirements.
6.How does Aetrix verify that P87C52SBBB,557 is sourced from the original manufacturer or authorized distributors?
All P87C52SBBB,557 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 P87C52SBBB,557 meets industry standards.
7.What is the process for return or replacement of P87C52SBBB,557?
All P87C52SBBB,557 units undergo pre-shipment inspection (PSI). If there is an issue with P87C52SBBB,557, 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 P87C52SBBB,557 part is unused and in its original packaging.
Return procedure for P87C52SBBB,557:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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