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NXP Semiconductors P87C52X2FBD,157
- Part No.:
- P87C52X2FBD,157
- Manufacturer:
- NXP Semiconductors
- Category:
- Microcontrollers
- Package:
- 44-LQFP
- Datasheet:
-
P87C52X2FBD,157.pdf
- Description:
- IC MCU 8BIT 8KB OTP 44LQFP
- Quantity:
- Payment:
- Shipping:
Inventory:4,631
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Product details
Overview
P87C52X2FBD,157 from NXP Semiconductors (formerly Philips) is an 8-bit OTP-based microcontroller in the enhanced 80C51 family, featuring 8 KB on-chip OTP program memory, 256 B RAM, three 16-bit timers/counters (T0/T1/T2), full-duplex UART with framing error detection and address recognition, and support for both 6-clock and 12-clock operation. It operates from 2.7 V to 5.5 V and delivers up to 33 MHz at 5 V in 12-clock mode - used in industrial control panels, legacy instrumentation, and embedded telemetry modules requiring ROM security and low-voltage compatibility.
For engineers reviewing the P87C52X2FBD,157 datasheet, P87C52X2FBD,157 pinout, P87C52X2FBD,157 application, or P87C52X2FBD,157 equivalent, key selection considerations include OTP-based code protection (3-bit security), LQFP44 package with –40 °C to +85 °C industrial temperature rating, dual data pointer support, programmable clock-out on P1.0, and wake-up-from-power-down via INT0/INT1 - all critical for long-lifecycle, field-deployed embedded systems.
Technical Context
This device implements a static CMOS 80C51 core with extended SFRs including T2CON, RCAP2H/L, and AUXR/AUXR1 for Timer 2 capture/compare and clock-mode control. It supports selectable 6-clock (2× speed) or 12-clock operation via CKCON.X2 bit or OTP OX2 bit - enabling runtime performance scaling without hardware change.
The architecture integrates a full-duplex enhanced UART with automatic address recognition and framing error detection, plus three independent 16-bit timers: T0/T1 (standard 80C51) and T2 (with capture, compare, reload, and clock-out modes). Power management includes 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 | Enhanced 80C51 CPU with Boolean processor and static design - enables zero-frequency operation and deterministic low-power states. |
| Memory | 8 KB on-chip OTP program memory + 256 B RAM - provides non-volatile, one-time-programmable firmware storage with 3-bit security lock. |
| Max Clock Frequency | 33 MHz at 5 V (12-clock mode); 30 MHz at 5 V (6-clock mode); 16 MHz across full 2.7–5.5 V range - ensures timing predictability in mixed-voltage systems. |
| Timers/Counters | Three 16-bit timers: T0/T1 standard; T2 with capture/compare/reload/clock-out - supports PWM generation, input capture, baud-rate generation, and synchronous clock distribution. |
| Serial Interface | Full-duplex UART with framing error detection and automatic address recognition - enables reliable multi-drop RS-485 communication without software overhead. |
| I/O & Peripherals | 32 configurable I/O lines across four ports; dual data pointer; programmable clock-out on P1.0; six interrupt sources with four priority levels - simplifies memory-mapped peripheral interfacing and real-time task scheduling. |
| Power Modes | Idle mode (CPU halted, RAM/timers/UART/interrupts active) and power-down mode (oscillator stopped, RAM retained to 2.0 V) - reduces system standby current to µA-level with fast wake-up. |
Pinout & Package
LQFP44 package (SOT389-1), 10 × 10 × 1.4 mm body, –40 °C to +85 °C industrial temperature range.
| 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 when used as general-purpose I/O. |
| P1.0/T2 | General I/O / Timer 2 external count input | Configurable as clock-out pin (50% duty cycle, 61 Hz–4 MHz) or T2 counter input - enables precise timing reference generation. |
| P1.1/T2EX | General I/O / T2 reload/capture control | Triggers reload or capture on T2 overflow/underflow - essential for pulse-width measurement and event timing. |
| P2.0–P2.7 | Bidirectional I/O / A8–A15 | High-order address bus during 16-bit external memory accesses; emits P2 register value during 8-bit MOVX @Ri operations. |
| P3.0/RxD | Serial input | UART receive input with framing error detection - supports asynchronous serial communication at programmable baud rates. |
| P3.1/TxD | Serial output | UART transmit output with automatic stop-bit insertion - enables full-duplex serial link without external transceiver logic. |
| P3.2/INT0 | External interrupt 0 input | Level-sensitive wake-up source from power-down mode - used for emergency event detection in battery-powered systems. |
| P3.6/WR & P3.7/RD | External memory strobes | Active-low write/read enable signals for external data memory interfacing - compatible with standard SRAM and peripheral ICs. |
| XTAL1/XTAL2 | Oscillator input/output | Supports crystal (1–24 MHz), ceramic resonator, or external clock drive - determines system timing base and affects all peripheral timing. |
| RST | Reset input | Active-high reset requiring ≥2 machine cycles (24/12 oscillator periods) - ensures reliable initialization after power-on or brownout. |
| EA/VPP | External access enable / programming voltage | Low = execute from external ROM; high = execute from internal OTP unless PC exceeds 0x1FFF - controls boot source and enables in-circuit programming. |
| ALE/PROG | Address latch enable / programming pulse | Outputs 1/6 (12-clock) or 1/3 (6-clock) oscillator frequency for external address latching; doubles as EPROM programming pulse. |
Key Features
| Feature | Design Value |
|---|---|
| OTP-based firmware security | 3-bit programmable security lock prevents unauthorized readout of 8 KB OTP memory - meets basic IP protection requirements for cost-sensitive industrial firmware. |
| Selectably configurable clock mode | Software-toggled 6-clock/12-clock operation via CKCON.X2 bit - allows dynamic performance scaling (e.g., high-speed burst processing vs. low-power monitoring). |
| Timer 2 clock-out capability | Programmable 50% duty-cycle clock output (61 Hz–4 MHz at 16 MHz osc.) on P1.0 - eliminates need for external clock generator in sensor synchronization or display timing. |
| Wake-up from power-down | INT0 or INT1 level-sensitive interrupt resumes operation with RAM/SFRs intact - enables µA-level sleep with sub-10 ms wake latency for responsive edge sensing. |
| Enhanced UART with address recognition | Hardware-accelerated multi-processor communication mode - reduces CPU load in RS-485 networks by filtering addressed frames before interrupt generation. |
| Static CMOS design | Zero-frequency operation with no data loss - permits clock gating, step-by-step debugging, and ultra-low-power intermittent operation in energy-constrained deployments. |
Applications
| Industrial PLC I/O Module | Legacy Medical Device Controller |
|---|---|
Use Scenario: Standalone digital I/O expansion module in DIN-rail mounted PLC chassis, communicating via RS-485 to main controller. IC Role / Device Role / Timing Role: Primary MCU executing ladder logic scan, managing 32-channel opto-isolated inputs/outputs, and handling Modbus RTU protocol stack. Use Value: 8 KB OTP ensures firmware integrity across 10+ year field life; UART address recognition enables collision-free multi-drop communication; T2 clock-out synchronizes sampling across distributed modules. |
Use Scenario: Embedded controller in portable blood glucose meter, managing LCD, button interface, analog front-end, and USB-to-serial bridge. IC Role / Device Role / Timing Role: System orchestrator coordinating ADC sampling, EEPROM logging, and host communication - operating at 16 MHz in 12-clock mode for optimal power/performance balance. Use Value: 2.7–5.5 V operation supports single-cell Li-ion or alkaline battery supply; idle mode reduces average current to <100 µA during standby; dual data pointer accelerates EEPROM block writes. |
| Energy Meter Communication Hub | Automotive Diagnostic Tool Firmware Core |
Use Scenario: Sub-metering gateway aggregating data from multiple smart meters via M-Bus or optical interface, forwarding to central SCADA via GPRS. IC Role / Device Role / Timing Role: Protocol translator and buffer manager - receiving asynchronous pulses from meter registers and formatting packets for wireless transmission. Use Value: Three 16-bit timers precisely time M-Bus pulse widths and inter-frame gaps; power-down mode extends battery life to >5 years in maintenance-free installations; OTP prevents field firmware tampering. |
Use Scenario: Handheld OBD-II scanner performing ISO 9141-2 and SAE J1850 VPW diagnostics on legacy vehicles. IC Role / Device Role / Timing Role: Real-time protocol engine generating precise 5-baud init sequences, interpreting response timing windows, and managing K-line half-duplex handshaking. Use Value: Programmable clock-out on P1.0 generates accurate 5-baud start bit timing; 6-clock mode enables 30 MHz operation for tight timing margins; –40 °C to +85 °C rating ensures reliability in under-hood environments. |
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 8051 core but no T2 or clock-out; max 24 MHz; DIP40 only | Lacks Timer 2 and programmable clock-out; unsuitable for applications requiring precise clock distribution or capture/compare functions | Choose only if reprogrammability is required and T2 functionality is unused; verify PCB layout supports DIP40 footprint. |
| P89C52X2FA,112 | Same OTP 8051 core, identical 8 KB/256 B spec, but PLCC44 package and –40 °C to +85 °C rating; no LQFP option | Same functional capability but incompatible LQFP44 footprint; requires board redesign for PLCC44 socket or soldering | Select only if existing PLCC44 infrastructure exists; not a drop-in replacement for P87C52X2FBD,157 due to package mismatch. |
Compared with AT89C52-24PU and P89C52X2FA,112, the P87C52X2FBD,157 uniquely combines OTP security, LQFP44 industrial packaging, Timer 2 clock-out, and 33 MHz capability - making it irreplaceable where firmware integrity, compact layout, and precise peripheral timing coexist.
Availability
P87C52X2FBD,157 is available at Aetrix Electronics and suitable for industrial control systems, legacy medical instrumentation, energy metering gateways, and automotive diagnostic tools requiring stable component supply across extended product lifecycles.
Supply support for P87C52X2FBD,157 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 (originally Philips Semiconductors) is a global semiconductor leader focused on secure connectivity solutions for automotive, industrial, and IoT applications.
The P87C52X2FBD,157 belongs to the legacy 80C51 OTP microcontroller product line, designed specifically for cost-sensitive, long-lifecycle embedded systems demanding code security, wide voltage operation, and proven architectural reliability.
FAQ
What is the maximum operating frequency of the P87C52X2FBD,157 and under what conditions?
The P87C52X2FBD,157 supports up to 33 MHz at 5 V in 12-clock mode and 30 MHz at 5 V in 6-clock mode. Across its full 2.7–5.5 V supply range, the maximum guaranteed frequency is 16 MHz. These values are specified in the official Philips Semiconductor Product Data sheet dated 2003 Jan 24 and validated for the LQFP44 package variant.
Does the P87C52X2FBD,157 include on-chip program memory, and what type is it?
Yes, the P87C52X2FBD,157 integrates 8 KB of on-chip One-Time-Programmable (OTP) memory. This non-volatile memory is programmed using a parallel programmer and features 3-bit security locking to prevent unauthorized readout - distinguishing it from ROM or Flash variants in the same family.
How many timers does the P87C52X2FBD,157 have, and what are their key capabilities?
The P87C52X2FBD,157 includes three 16-bit timers: T0 and T1 are standard 80C51 timers supporting mode 0–3; T2 is an enhanced timer with capture, compare, auto-reload, and programmable clock-out functions. T2's clock-out mode generates a 50% duty-cycle signal on P1.0, ranging from 61 Hz to 4 MHz at 16 MHz oscillator frequency.
Can the P87C52X2FBD,157 operate from a 3.3 V supply, and what performance trade-offs apply?
Yes, the P87C52X2FBD,157 is fully specified for 2.7–5.5 V operation. At 3.3 V, the maximum guaranteed clock frequency is 16 MHz in both 6-clock and 12-clock modes. This limitation ensures timing margin compliance and stable operation across process/voltage/temperature corners per the 2003 Philips datasheet.
What package and temperature grade does the P87C52X2FBD,157 use?
The P87C52X2FBD,157 uses a 44-pin LQFP package (SOT389-1) with 10 × 10 × 1.4 mm dimensions and is rated for industrial temperature operation from –40 °C to +85 °C - confirmed in the "P87C52X2 ORDERING INFORMATION" section of the Philips product data sheet.
P87C52X2FBD,157 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Package/Case:
- 44-LQFP
- Series:
- 87C
- Packaging:
- Tray
- 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):
- 2.7V ~ 5.5V
- Data Converters:
- -
- Oscillator Type:
- Internal
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
P87C52X2FBD,157 FAQ
1.How can I place an order for P87C52X2FBD,157 through Aetrix?
Please submit a Request for Quotation (RFQ) for P87C52X2FBD,157 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 P87C52X2FBD,157 reliable?
The price and inventory of P87C52X2FBD,157 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for P87C52X2FBD,157 is usually 5 days.
3.What payment methods are accepted for P87C52X2FBD,157?
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4.How is shipping managed for P87C52X2FBD,157?
P87C52X2FBD,157 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your P87C52X2FBD,157 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 P87C52X2FBD,157?
For technical support, including P87C52X2FBD,157 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your P87C52X2FBD,157 requirements.
6.How does Aetrix verify that P87C52X2FBD,157 is sourced from the original manufacturer or authorized distributors?
All P87C52X2FBD,157 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 P87C52X2FBD,157 meets industry standards.
7.What is the process for return or replacement of P87C52X2FBD,157?
All P87C52X2FBD,157 units undergo pre-shipment inspection (PSI). If there is an issue with P87C52X2FBD,157, 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 P87C52X2FBD,157 part is unused and in its original packaging.
Return procedure for P87C52X2FBD,157:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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