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NXP Semiconductors P87C52X2BA,512
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- Part No.:
- P87C52X2BA,512
- Manufacturer:
- NXP Semiconductors
- Category:
- Microcontrollers
- Package:
- 44-LCC (J-Lead)
- Datasheet:
-
P87C52X2BA,512.pdf
- Description:
- IC MCU 8BIT 8KB OTP 44PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:3,166
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Product details
Overview
P87C52X2BA,512 from NXP Semiconductors (formerly Philips) 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 modes. 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 firmware-upgradable logic.
For engineers reviewing the P87C52X2BA,512 datasheet, P87C52X2BA,512 pinout, P87C52X2BA,512 application, or P87C52X2BA,512 equivalent, this page provides verified technical context, validated package mapping (PLCC44, SOT187-2), confirmed low-power idle/power-down modes, exact oscillator configuration options, and two field-tested alternative parts for legacy 8051-based designs.
Technical Context
This device implements a static CMOS 80C51 core with dual clock-mode selection (6-clock or 12-clock) controlled via CKCON register bit X2 and OTP bit OX2 - enabling runtime switching between 30 MHz (6-clock @ 5 V) and 33 MHz (12-clock @ 5 V). The CPU retains full compatibility with MCS-51 instruction set while adding Timer 2 with capture/compare capability and programmable clock-out on P1.0.
Power management includes hardware-supported idle mode (CPU halted, peripherals active) and power-down mode (oscillator stopped, RAM retained down to 2.0 V), with wake-up via external interrupt (INT0/INT1) or reset. All I/O ports feature internal pull-ups and configurable alternate functions including UART, timer inputs, and address/data multiplexing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Core Architecture | Enhanced 80C51 static CMOS CPU with Boolean processor and dual clock mode (6/12-clock) |
| Memory | 8 KB on-chip OTP ROM + 256 B SRAM - no external boot required; supports code execution from internal memory only unless EA pin is asserted low |
| 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 8051) + T2 (enhanced with capture, compare, auto-reload, and clock-out) |
| Serial Interface | Full-duplex UART with framing error detection, automatic address recognition, and variable baud rate generation via T1 or T2 |
| I/O & Peripherals | Four 8-bit bidirectional ports (32 total pins), six interrupt sources, four priority levels, programmable clock-out on P1.0 |
| Power Modes | Idle mode (CPU halted, RAM/timers/UART/interrupts active); Power-down mode (oscillator stopped, RAM retained to 2.0 V) |
Pinout & Package
Package: PLCC44 (plastic leaded chip carrier), SOT187-2, commercial temperature range (0 °C to +70 °C).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| P0.0–P0.7 | Port 0 bidirectional I/O / AD0–AD7 / A0–A7 | Open-drain port; serves as multiplexed address/data bus for external memory access; requires external pull-ups during program verification |
| 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 @ 16 MHz osc); default I/O when T2 not enabled |
| P1.1/T2EX | Port 1.1 / Timer 2 reload/capture/direction control | Controls T2 reload value, capture trigger, or direction in up/down counter mode; not used in standard UART or timer applications |
| P2.0–P2.7 | Port 2 bidirectional I/O / A8–A15 | Provides high-order address byte during 16-bit external memory accesses; emits P2 register contents during 8-bit MOVX @Ri operations |
| P3.0/RxD | Port 3.0 / Serial input | UART receive input; supports multi-processor communication and full-duplex asynchronous operation |
| P3.1/TxD | Port 3.1 / Serial output | UART transmit output; generates serial data stream synchronized to baud rate generator (T1 or T2) |
| P3.2/INT0 | Port 3.2 / External interrupt 0 | Level-sensitive or edge-triggered interrupt source; used for emergency stop, sensor event capture, or wake-up from power-down |
| P3.4/T0 | Port 3.4 / Timer 0 external input | Counts external pulses on falling edge; enables frequency measurement, pulse-width capture, or event timing independent of CPU |
| RST | Reset input | Active-high reset requiring ≥2 machine cycles (24 clocks @ 12-clock mode); internal pull-down enables power-on reset with single capacitor to VCC |
| XTAL1/XTAL2 | Oscillator input/output | Supports crystal (1–33 MHz), ceramic resonator, or external clock drive; XTAL2 unconnected when using external clock source |
| EA/VPP | External access enable / programming voltage | High = execute from internal OTP; low = fetch from external program memory; also accepts 12.75 V VPP during OTP 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 |
|---|---|
| 6-clock / 12-clock mode select | Runtime switchable via CKCON.X2 bit - doubles instruction throughput without changing oscillator or PCB layout |
| Timer 2 with clock-out capability | Generates precise 50% duty-cycle clock (61 Hz–8 MHz) on P1.0 while simultaneously serving as UART baud-rate generator |
| Low-voltage operation | Functional from 2.7 V to 5.5 V - enables direct interface with 3.3 V logic and battery-backed systems without level-shifting |
| Power-down wake-up via INT0/INT1 | Retains RAM contents at ≤2.0 V; resumes execution from instruction following power-down command upon level-sensitive interrupt |
| OTP security bits | Three programmable security bits prevent unauthorized readout of on-chip firmware - essential for IP protection in OEM deployments |
| ONCE™ debug mode | Enables in-circuit emulation by holding ALE low during reset - eliminates need for socketed programming or target board modification |
Applications
| Industrial Motor Control | Legacy Instrumentation Interface |
|---|---|
Use Scenario: Standalone motor sequencer in HVAC blower units, managing start/stop timing, thermal fault monitoring, and speed feedback via opto-isolated inputs. IC Role / Device Role / Timing Role: Primary controller executing deterministic real-time loop (≤100 µs jitter) using Timer 0 for PWM sync and UART for Modbus RTU communication. Use Value: 8 KB OTP ensures field-upgradable firmware without external memory; 256 B RAM accommodates PID coefficients and sensor history buffers. |
Use Scenario: Protocol translator bridging analog sensor outputs (4–20 mA) to RS-485 networks in legacy plant-floor analyzers. IC Role / Device Role / Timing Role: UART-based data concentrator with framing error detection and automatic address recognition for multi-drop Modbus slave addressing. Use Value: Full-duplex UART + T2 baud-rate generation enables simultaneous sensor polling and upstream reporting without CPU overhead. |
| Energy Meter Firmware Host | Embedded Security Keypad Controller |
Use Scenario: Firmware host in Class 0.5S electricity meters, validating metrology IC SPI reads and storing tamper logs in on-chip EEPROM-emulated sectors. IC Role / Device Role / Timing Role: Secure execution environment for cryptographic checksum validation and time-stamped event logging using Timer 2 capture registers. Use Value: Three 16-bit timers allow concurrent metering interval timing, watchdog supervision, and secure log timestamping without external components. |
Use Scenario: Tamper-resistant keypad controller in access control panels, scanning matrix keys, debouncing inputs, and triggering relay drivers on valid PIN entry. IC Role / Device Role / Timing Role: Real-time I/O manager with idle-mode power gating - reduces standby current to <50 µA while maintaining key-scan readiness. Use Value: Internal pull-ups eliminate external resistors; OTP security bits prevent firmware extraction during physical inspection. |
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 (not OTP), 256 B RAM, same 8051 core, but lacks T2 and programmable clock-out; max 24 MHz | No built-in clock-out or T2 capture - requires external oscillator for synchronous peripherals; limited to lower-frequency timing tasks | Select when field reprogrammability is required and T2 functionality is unused; verify Flash endurance (1,000 cycles) vs OTP one-time write |
| P89C51RD2FA | 64 KB Flash, 1.25 KB RAM, enhanced UART with FIFO, but no T2; supports ISP via UART; 3.3 V/5 V tolerant I/O | Higher memory and peripheral integration, but incompatible T2 register map and clock-out implementation - not drop-in | Choose for new designs needing larger code space and in-system programming; requires PCB layout changes due to LQFP44 footprint and voltage tolerance |
Compared with AT89C52-24PU and P89C51RD2FA, the P87C52X2BA,512 offers unique T2-based clock generation and OTP security for fixed-function embedded control, whereas alternatives trade that capability for reprogrammability or expanded memory - making P87C52X2BA,512 optimal for cost-sensitive, tamper-resistant, timing-critical legacy upgrades.
Availability
P87C52X2BA,512 is available at Aetrix Electronics and suitable for industrial motor control, legacy instrumentation interface, energy meter firmware hosting, and embedded security keypad control requiring stable component supply across extended product lifecycles.
Supply support for P87C52X2BA,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
NXP Semiconductors (formerly Philips Semiconductors) is a global semiconductor leader specializing in secure connectivity solutions for automotive, industrial, and IoT applications.
The P87C52X2BA,512 belongs to the legacy 80C51 family designed for cost-effective, low-power, high-reliability embedded control in industrial automation and instrumentation where long-term availability and deterministic timing are critical.
FAQ
What is the maximum operating frequency of the P87C52X2BA,512 and under what conditions?
The P87C52X2BA,512 supports up to 33 MHz at 5 V in 12-clock mode and 30 MHz at 5 V in 6-clock mode. At lower supply voltages (2.7–5.5 V), the maximum frequency is limited to 16 MHz regardless of clock mode. These values are guaranteed per the 2003 Philips product data sheet and apply specifically to the P87C52X2BA,512 in PLCC44 package with commercial temperature range.
Does the P87C52X2BA,512 support in-system programming (ISP)?
No, the P87C52X2BA,512 uses one-time-programmable (OTP) ROM and does not support in-system programming. Programming requires a parallel programmer with 12.75 V VPP applied to the EA/VPP pin. Unlike Flash-based alternatives such as P89C51RD2FA, the P87C52X2BA,512 firmware is permanently written during manufacturing or initial programming - making it suitable for secure, unchangeable control logic.
What are the power-down current specifications for the P87C52X2BA,512?
The P87C52X2BA,512 retains RAM contents down to 2.0 V in power-down mode, with typical supply current below 10 µA at 3 V and 25 °C. This value assumes all peripherals disabled, ALE/PSEN inactive, and ports configured for minimal leakage. Actual current depends on external circuit loading and must be validated per application - the P87C52X2BA,512 datasheet specifies no maximum power-down current, only functional retention limits.
Can the P87C52X2BA,512 generate a precise clock signal for external logic?
Yes, the P87C52X2BA,512 can generate a precise 50% duty-cycle clock on P1.0 using Timer 2 in clock-out mode. The output frequency ranges from 61 Hz to 4 MHz (at 16 MHz oscillator in 12-clock mode) or 122 Hz to 8 MHz (in 6-clock mode), calculated as fosc / [n × (65536 − RCAP2H:RCAP2L)], where n = 4 (12-clock) or 2 (6-clock). This capability is documented for the P87C52X2BA,512 in Philips' 2003 product data.
Is the P87C52X2BA,512 pin-compatible with other members of the P87C5xX2 family?
Yes, the P87C52X2BA,512 shares identical pinout and electrical characteristics with P87C51X2BA, P87C54X2BA, and P87C58X2BA in the PLCC44 package (SOT187-2). Differences are limited to on-chip memory size (4 KB/8 KB/16 KB/32 KB OTP) and associated security bit configurations - allowing PCB reuse across variants when memory requirements scale within the same package.
P87C52X2BA,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:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
P87C52X2BA,512 FAQ
1.How can I place an order for P87C52X2BA,512 through Aetrix?
Please submit a Request for Quotation (RFQ) for P87C52X2BA,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 P87C52X2BA,512 reliable?
The price and inventory of P87C52X2BA,512 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for P87C52X2BA,512 is usually 5 days.
3.What payment methods are accepted for P87C52X2BA,512?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for P87C52X2BA,512 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for P87C52X2BA,512?
P87C52X2BA,512 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your P87C52X2BA,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 P87C52X2BA,512?
For technical support, including P87C52X2BA,512 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your P87C52X2BA,512 requirements.
6.How does Aetrix verify that P87C52X2BA,512 is sourced from the original manufacturer or authorized distributors?
All P87C52X2BA,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 P87C52X2BA,512 meets industry standards.
7.What is the process for return or replacement of P87C52X2BA,512?
All P87C52X2BA,512 units undergo pre-shipment inspection (PSI). If there is an issue with P87C52X2BA,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 P87C52X2BA,512 part is unused and in its original packaging.
Return procedure for P87C52X2BA,512:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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