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NXP Semiconductors P87C52X2FA,512
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- Part No.:
- P87C52X2FA,512
- Manufacturer:
- NXP Semiconductors
- Category:
- Microcontrollers
- Package:
- 44-LCC (J-Lead)
- Datasheet:
-
P87C52X2FA,512.pdf
- Description:
- IC MCU 8BIT 8KB OTP 44PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:4,365
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Product details
Overview
P87C52X2FA,512 from Philips Semiconductors is an 8-bit OTP microcontroller based on the enhanced 80C51 architecture, featuring 8 KB on-chip OTP ROM, 256 B RAM, three 16-bit timers/counters (T0/T1/T2), full-duplex UART with framing error detection, 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 requiring deterministic real-time I/O handling and low-voltage field deployment.
For engineers reviewing the P87C52X2FA,512 datasheet, P87C52X2FA,512 pinout, P87C52X2FA,512 application, or P87C52X2FA,512 equivalent, key selection criteria include OTP memory security (3-bit protection), dual data pointer support, programmable clock-out on P1.0, wake-up-from-power-down via INT0/INT1, and PLCC44 package compatibility with extended temperature range (–40 °C to +85 °C).
Technical Context
This device implements a static CMOS 80C51 core with fully compatible instruction set and SFR layout, augmented by Timer 2 (capture/compare/autoreload), dual clock modes (6/12-clk selectable via CKCON.X2 or OTP bit OX2), and enhanced power management including idle and power-down modes with RAM retention down to 2.0 V. The oscillator supports crystal/resonator or external clock input via XTAL1/XTAL2.
It features four 8-bit bidirectional ports (P0–P3) with internal pull-ups on P1/P2/P3, open-drain P0 with strong pull-ups during external memory access, and dedicated alternate functions including T2/T2EX on P1.0/P1.1, RxD/TxD on P3.0/P3.1, and WR/RD strobes on P3.6/P3.7 - enabling direct interfacing with parallel peripherals and legacy 80C51-compatible hardware.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Core Architecture | Enhanced 80C51 CPU with Boolean processor and static design enabling 0 Hz operation |
| Memory | 8 KB on-chip OTP ROM + 256 B RAM; supports up to 64 KB external program/data memory addressing |
| 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 |
| Timers/Counters | Three 16-bit timers: T0/T1 (standard 80C51) + T2 (enhanced with capture, compare, autoreload, clock-out) |
| Serial Interface | Full-duplex UART with framing error detection, automatic address recognition, and SMOD0/SMOD1 baud rate control |
| Power Modes | Idle mode (CPU halted, peripherals active) and Power-Down mode (oscillator stopped, RAM retained to 2.0 V) |
| I/O Ports | Four 8-bit ports (32 total lines); P0 open-drain with multiplexed AD0–AD7; P1/P2/P3 with internal pull-ups |
Pinout & Package
Package: PLCC44 (SOT187-2), plastic leaded chip carrier, 44-pin, surface-mount, operating temperature range –40 °C to +85 °C.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| P0.0–P0.7 | Port 0 bidirectional I/O / AD0–AD7 multiplexed bus | Open-drain outputs; requires external pull-ups for general-purpose use; provides low-byte address/data during external memory access |
| P1.0/T2 | Port 1.0 / Timer 2 external count input or clock-out | Configurable as T2 input or 50% duty cycle clock output (61 Hz–4 MHz at 16 MHz osc. in 12-clk mode) |
| P1.1/T2EX | Port 1.1 / Timer 2 reload/capture/direction control | Enables capture mode, reload on overflow, or direction control for up/down counting |
| P2.0–P2.7 | Port 2 bidirectional I/O / A8–A15 high-order address | Provides upper address byte during 16-bit external memory accesses; internal pull-ups enable safe high-impedance input |
| P3.0/RxD | Port 3.0 / Serial input | UART receive input with Schmitt-triggered input for noise immunity |
| P3.1/TxD | Port 3.1 / Serial output | UART transmit output; drives external level shifter or RS-232 transceiver directly |
| P3.2/INT0 | Port 3.2 / External interrupt 0 input | Level-sensitive or edge-triggered interrupt source; enables wake-up from Power-Down when WUPD=1 |
| P3.6/WR & P3.7/RD | External memory write/read strobes | Active-low control signals synchronized to ALE; usable for interfacing with parallel ADCs, DACs, or SRAM |
| XTAL1 & XTAL2 | Oscillator input/output | Supports crystal (1–33 MHz), ceramic resonator, or external clock; XTAL2 unconnected when using external clock |
| RST | Reset input | High for ≥2 machine cycles (24/12 osc. periods) resets CPU, clears SFRs except RAM; internal weak pull-down permits RC-based POR |
| EA/VPP | External access enable / programming voltage | Low = execute from external ROM; high = execute from internal OTP unless PC exceeds 0x1FFF; receives 12.75 V during OTP programming |
| ALE/PROG | Address latch enable / programming pulse | Outputs 1/6 (12-clk) or 1/3 (6-clk) oscillator frequency; disabled via AUXR.0 to reduce EMI; serves as PROG pulse during OTP programming |
Key Features
| Feature | Design Value |
|---|---|
| OTP Security Protection | Three programmable security bits prevent unauthorized readout of on-chip OTP contents |
| Programmable Clock-Out | 50% duty cycle clock output on P1.0, configurable from 61 Hz to 4 MHz (12-clk) without CPU intervention |
| Dual Clock Mode | Software-selectable 6-clock or 12-clock operation via CKCON.X2 bit - doubles effective instruction throughput in 6-clk mode |
| Wake-Up from Power-Down | Enabled via INT0 or INT1 with level-sensitive configuration and WUPD bit (AUXR1.3), preserving RAM and SFR state |
| Low-EMI Operation | Configurable ALE inhibit, slew-rate controlled outputs, and 6-clock mode reduce radiated emissions for industrial EMC compliance |
| ONCE™ Emulation Mode | On-circuit debug entry via ALE-low + reset sequence - allows in-system firmware validation without socket removal |
Applications
| Industrial PLC I/O Module | Legacy Equipment Controller |
|---|---|
Use Scenario: Standalone I/O expansion module in DIN-rail mounted PLC rack, interfacing with 24 V DC sensors and solenoids via optocoupled inputs/outputs. IC Role / Device Role / Timing Role: Primary controller executing ladder logic scan cycles; manages parallel port handshaking, UART Modbus RTU communication, and timer-based PWM for analog output emulation. Use Value: 256 B RAM suffices for real-time I/O image buffering; OTP ensures firmware integrity; PLCC44 package withstands vibration; –40 °C to +85 °C rating supports unconditioned cabinet environments. |
Use Scenario: Retrofit controller replacing obsolete 8051-based motion sequencer in CNC machine tool axis drive interface. IC Role / Device Role / Timing Role: Real-time motion profile generator using Timer 2 for precise pulse-width modulation and T0/T1 for encoder quadrature decoding and step/direction timing. Use Value: Pin-compatible replacement for P80C52X2FN; identical SFR map and instruction timing; OTP eliminates EPROM UV erasure logistics; 6-clock mode restores original throughput at lower VCC. |
| Smart Energy Meter Interface | Building Automation Gateway |
Use Scenario: Sub-metering node collecting pulse counts from utility meters and reporting via RS-485 to central HAN gateway. IC Role / Device Role / Timing Role: Low-power data concentrator with UART-to-485 translation, pulse accumulation counters (T0/T1), and RTC emulation via T2 auto-reload. Use Value: Power-down mode draws <10 µA while retaining pulse count in RAM; 2.7 V minimum VCC supports battery backup; framing error detection improves Modbus CRC reliability. |
Use Scenario: Protocol translator bridging BACnet MS/TP (RS-485) to LonWorks TP/FT-10 (twisted-pair) in HVAC control panel. IC Role / Device Role / Timing Role: Dual-serial bridge with one UART handling MS/TP MAC layer and second UART (via software bit-banging on P1) managing TP/FT-10 physical layer timing. Use Value: Dual data pointers accelerate packet buffer copying between protocols; 8 KB OTP stores dual-stack firmware; PLCC44 simplifies rework in dense PCB layouts. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 8-bit microcontroller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| P80C52X2FA | ROM version (mask-programmed) instead of OTP; identical pinout, timing, and SFRs; no field-programmable capability | Suitable only for high-volume production where firmware is finalized and mask ROM NRE cost is justified | Select P80C52X2FA only when firmware is immutable and volume exceeds 10k units/year to offset mask cost |
| P89C51RB2FA | Flash-based 80C51 derivative with 64 KB Flash, ISP capability, and enhanced peripherals (PCA, SPI, I²C); not pin-compatible | Requires PCB redesign but enables field firmware updates and richer peripheral integration | Choose P89C51RB2FA when post-deployment firmware updates or additional interfaces (SPI/I²C) are required |
Compared with P80C52X2FA, the P87C52X2FA,512 offers field-programmable OTP with security bits for firmware IP protection, while P89C51RB2FA provides flash reprogrammability and expanded peripherals at the cost of board-level redesign - making P87C52X2FA,512 optimal for medium-volume, fixed-function industrial controllers needing secure, one-time firmware loading.
Availability
P87C52X2FA,512 is available at Aetrix Electronics and suitable for industrial PLC I/O modules, legacy equipment retrofits, smart energy meter interfaces, and building automation gateways requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for P87C52X2FA,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 global semiconductor innovator founded in the Netherlands, specializing in mixed-signal ICs, RF solutions, and automotive microcontrollers with emphasis on reliability and industrial longevity.
The P87C52X2FA,512 belongs to the 80C51X2 OTP microcontroller family designed for cost-sensitive, high-reliability embedded control applications where firmware immutability, wide voltage operation, and legacy 8051 ecosystem compatibility are critical.
FAQ
What is the maximum operating frequency of the P87C52X2FA,512 and under what conditions?
The P87C52X2FA,512 supports up to 33 MHz in 12-clock mode at 5 V ±10%, and up to 30 MHz in 6-clock mode at the same supply. Across its full 2.7 V to 5.5 V range, the maximum guaranteed frequency is 16 MHz in either clock mode. These limits are defined in the oscillator characteristics table and validated per JEDEC JESD78 reliability testing.
Does the P87C52X2FA,512 support in-system programming or field firmware updates?
No, the P87C52X2FA,512 uses one-time-programmable (OTP) ROM and does not support in-system programming. Firmware must be programmed using a parallel programmer before soldering. Once programmed, the three OTP security bits prevent further reads or writes - ensuring firmware integrity but precluding field updates.
How does the P87C52X2FA,512 handle power-down mode wake-up, and which pins support it?
The P87C52X2FA,512 exits Power-Down mode via hardware reset or level-sensitive external interrupts on INT0 (P3.2) or INT1 (P3.3), provided the WUPD bit (AUXR1.3) is set. Upon wake-up, RAM and SFRs retain their pre-Power-Down values, and execution resumes from the instruction following the Power-Down command.
What package and temperature grade is specified for the P87C52X2FA,512?
The P87C52X2FA,512 is supplied in a PLCC44 package (SOT187-2) rated for industrial temperature operation from –40 °C to +85 °C. This is explicitly indicated by the "F" suffix in the part number and confirmed in the Ordering Information tables for all P87C52X2FA variants.
Can the P87C52X2FA,512 generate a precise clock output, and if so, on which pin and with what resolution?
Yes, the P87C52X2FA,512 can generate a precise 50% duty cycle clock output on P1.0 using Timer 2 in clock-out mode. Frequency resolution is determined by the 16-bit RCAP2H/RCAP2L reload value and oscillator frequency, enabling programmable outputs from 61 Hz to 4 MHz (at 16 MHz osc., 12-clock mode) with ±1 LSB accuracy.
P87C52X2FA,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):
- 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:
P87C52X2FA,512 FAQ
1.How can I place an order for P87C52X2FA,512 through Aetrix?
Please submit a Request for Quotation (RFQ) for P87C52X2FA,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 P87C52X2FA,512 reliable?
The price and inventory of P87C52X2FA,512 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for P87C52X2FA,512 is usually 5 days.
3.What payment methods are accepted for P87C52X2FA,512?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for P87C52X2FA,512 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for P87C52X2FA,512?
P87C52X2FA,512 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your P87C52X2FA,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 P87C52X2FA,512?
For technical support, including P87C52X2FA,512 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your P87C52X2FA,512 requirements.
6.How does Aetrix verify that P87C52X2FA,512 is sourced from the original manufacturer or authorized distributors?
All P87C52X2FA,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 P87C52X2FA,512 meets industry standards.
7.What is the process for return or replacement of P87C52X2FA,512?
All P87C52X2FA,512 units undergo pre-shipment inspection (PSI). If there is an issue with P87C52X2FA,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 P87C52X2FA,512 part is unused and in its original packaging.
Return procedure for P87C52X2FA,512:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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