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NXP Semiconductors P87C52X2BBD,157
- Part No.:
- P87C52X2BBD,157
- Manufacturer:
- NXP Semiconductors
- Category:
- Microcontrollers
- Package:
- 44-LQFP
- Datasheet:
-
P87C52X2BBD,157.pdf
- Description:
- IC MCU 8BIT 8KB OTP 44LQFP
- Quantity:
- Payment:
- Shipping:
Inventory:3,847
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Product details
Overview
P87C52X2BBD,157 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 - suitable for industrial control modules requiring deterministic timing and low-voltage compatibility.
For engineers reviewing the P87C52X2BBD,157 datasheet, P87C52X2BBD,157 pinout, P87C52X2BBD,157 application, or P87C52X2BBD,157 equivalent, key selection criteria include OTP memory size, LQFP-44 package footprint, dual clock-mode flexibility, power-down wake-up via INT0/INT1, and compatibility with legacy 8051 toolchains and debug infrastructure.
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. The CPU supports fully static operation down to 0 Hz, enabling precise power management via software-selectable idle and power-down modes - where oscillator stop preserves RAM and SFR contents at voltages ≥2.0 V.
Timer 2 functions as a versatile peripheral: it can serve as a 16-bit auto-reload timer, capture/compare unit, baud-rate generator, or programmable clock-out source (50% duty cycle, up to 8 MHz in 6-clock mode). The UART includes automatic address recognition and framing error detection, while ALE output frequency is configurable at 1/3 (6-clock) or 1/6 (12-clock) of oscillator frequency.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Core Architecture | Enhanced 80C51 CPU with Boolean processor and dual clock-mode (6/12-clock selectable) |
| Memory | 8 KB on-chip OTP ROM + 256 B RAM; supports external 64 KB 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 at 2.7–5.5 V |
| Power Supply Range | 2.7 V to 5.5 V - enables direct interface with 3.3 V logic and battery-backed systems |
| Timers/Counters | Three 16-bit timers: T0/T1 (standard 80C51) + T2 (enhanced with capture, compare, reload, clock-out) |
| Serial Interface | Full-duplex UART with framing error detection, automatic address recognition, and variable baud rate |
| Interrupt System | Six interrupt sources with four priority levels and nested interrupt capability |
Pinout & Package
LQFP-44 package (SOT389-1), body size 10 × 10 × 1.4 mm, 0 °C to +70 °C operating 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 inputs or during program verification |
| P1.0/T2 | Port 1 bit 0 / Timer 2 external count input | Configurable as general-purpose I/O or Timer 2 clock input; also supports programmable clock-out function |
| P1.1/T2EX | Port 1 bit 1 / Timer 2 capture/reload control | Controls reload/capture event direction and timing for Timer 2 in capture/compare mode |
| P2.0–P2.7 | Bidirectional I/O / A8–A15 | Provides high-order address byte during external memory accesses; emits P2 register content during 8-bit MOVX @Ri operations |
| P3.0/RxD | Serial input port | UART receive input; supports multi-processor communication and full-duplex asynchronous data transfer |
| P3.1/TxD | Serial output port | UART transmit output; generates serial frames synchronized to internal baud-rate generator |
| P3.2/INT0 | External interrupt 0 input | Level-sensitive or edge-triggered interrupt source; enables wake-up from Power Down mode when WUPD=1 |
| P3.6/WR & P3.7/RD | External memory strobes | Active-low write/read enable signals for interfacing with external RAM or peripherals using standard 8051 bus protocol |
| XTAL1/XTAL2 | Oscillator input/output | Supports crystal (1–24 MHz), ceramic resonator, or external clock source; internal inverting amplifier provides gain |
| EA/VPP | External access enable / programming voltage | When high, executes from internal OTP up to address limit; when low, fetches code from external memory starting at 0000H |
| RST | Reset input | Active-high reset requiring ≥2 machine cycles (24/12 oscillator periods in 12/6-clock mode) while oscillator runs |
| ALE/PROG | Address latch enable / programming pulse | Outputs latching pulse at 1/6 (12-clock) or 1/3 (6-clock) oscillator frequency; disabled when AUXR.0 = 1 |
| PSEN | Program store enable | Active-low read strobe for external program memory; inactive during internal code execution |
Key Features
| Feature | Design Value |
|---|---|
| 6-clock / 12-clock mode select | Runtime switchable via CKCON.X2 bit - doubles instruction throughput without changing oscillator |
| Programmable clock-out on P1.0 | Generates precise 50% duty cycle clock (61 Hz–8 MHz) using Timer 2, eliminating need for external clock generator |
| Power-down wake-up via INT0/INT1 | Enables ultra-low-power standby with sub-µA current draw and deterministic wake-up latency under 10 ms |
| Enhanced Timer 2 | Supports simultaneous baud-rate generation and clock-out, plus capture/compare for PWM or event timing |
| Security bits & encryption array | OTP security bits (3-bit) and 64-byte encryption array prevent unauthorized firmware extraction or cloning |
Applications
| Industrial PLC I/O Module | Legacy Equipment Retrofit Controller |
|---|---|
Use Scenario: Replacing obsolete microcontrollers in DIN-rail mounted I/O expansion units with fieldbus interfaces. IC Role / Device Role / Timing Role: Primary system controller executing ladder logic scan, managing RS-485 Modbus RTU communication, and driving opto-isolated digital outputs. Use Value: 8 KB OTP retains custom firmware across power cycles; LQFP-44 footprint matches existing PCB layout; 2.7–5.5 V operation supports wide-range industrial power supplies. | Use Scenario: Upgrading aging test equipment controllers that previously used NMOS 8051 variants. IC Role / Device Role / Timing Role: Drop-in replacement for P80C52 with identical instruction set, pinout, and memory map - preserving legacy assembly code and hardware design. Use Value: CMOS process reduces power by >70% vs. NMOS; 33 MHz max frequency enables faster test sequence execution without board redesign. |
| Smart Sensor Node MCU | Low-Power Data Logger |
Use Scenario: Embedded node collecting analog sensor data and transmitting via UART-to-LoRaWAN gateway. IC Role / Device Role / Timing Role: Sensor interface controller with ADC driver (via external converter), UART interface, and sleep/wake scheduling using Timer 2 interrupts. Use Value: Idle and Power-down modes reduce average current to <10 µA; programmable clock-out synchronizes external ADC sampling without extra components. | Use Scenario: Battery-powered environmental monitor logging temperature/humidity every 5 minutes over 6 months. IC Role / Device Role / Timing Role: Main system controller managing RTC emulation via Timer 2, EEPROM writes, and wake-up scheduling using external interrupt from real-time clock alarm. Use Value: Power-down mode draws only leakage current; wake-up via INT0 ensures deterministic resume time; OTP prevents firmware corruption during brown-out events. |
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; DIP-40 only | Lacks Timer 2 and programmable clock-out; limited to through-hole assembly; no low-voltage operation below 4.0 V | Select when firmware updates are required in-field and DIP packaging is acceptable |
| P89C52X2BBD,157 | Same OTP ROM size and LQFP-44 package; adds ONCE debug mode and improved EMI performance via slew-rate control | Includes ONCE emulation mode for in-circuit debugging; optimized for noise-sensitive industrial environments | Select when production firmware immutability and debug visibility are critical |
Compared with AT89C52-24PU and P89C52X2BBD,157, the P87C52X2BBD,157 offers guaranteed OTP firmware integrity, native LQFP-44 surface-mount compatibility, and deterministic low-power behavior - making it optimal for cost-sensitive, volume-manufactured industrial controllers where reprogramming is unnecessary and board space is constrained.
Availability
P87C52X2BBD,157 is available at Aetrix Electronics and suitable for industrial automation, legacy equipment modernization, and battery-powered sensor nodes requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for P87C52X2BBD,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
Philips Semiconductors (now NXP Semiconductors) is a global semiconductor innovator with leadership in mixed-signal ICs, automotive electronics, and secure identification solutions.
The P87C52X2BBD,157 belongs to the 80C51 family - designed specifically for industrial control, instrumentation, and embedded systems requiring proven 8051 compatibility, OTP security, and robust low-voltage operation.
FAQ
What is the maximum operating frequency of the P87C52X2BBD,157 at 3.3 V?
The P87C52X2BBD,157 supports a maximum external clock frequency of 16 MHz when operated from 2.7 V to 5.5 V - regardless of supply voltage within that range. This applies to both 6-clock and 12-clock modes, with actual instruction throughput doubling in 6-clock mode (i.e., 16 MHz clock yields ~2.67 MIPS vs. ~1.33 MIPS at same frequency in 12-clock mode).
Does the P87C52X2BBD,157 support in-system programming (ISP)?
No, the P87C52X2BBD,157 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. Firmware is permanently locked after programming, ensuring immunity to accidental overwrite or corruption in deployed systems.
Can the P87C52X2BBD,157 operate in power-down mode with VCC = 2.5 V?
Yes - the P87C52X2BBD,157 retains RAM and SFR contents down to 2.0 V during power-down mode. At 2.5 V, the device remains fully functional upon wake-up, provided the external interrupt or reset signal meets timing requirements and VCC stabilizes before oscillator restart (typically <10 ms).
What is the function of the T2EX (P1.1) pin on the P87C52X2BBD,157?
On the P87C52X2BBD,157, the T2EX (P1.1) pin serves as the Timer 2 capture/reload/external control input. It triggers reload or capture events based on T2CON.EXEN2 configuration and controls direction in up/down counter mode - enabling precise event timing, pulse-width measurement, or quadrature decoding without CPU intervention.
Is the P87C52X2BBD,157 pin-compatible with the P80C52X2BBD,157?
Yes - the P87C52X2BBD,157 and P80C52X2BBD,157 share identical LQFP-44 pinout, electrical characteristics, and memory architecture. The only difference is memory type: P87C52X2 uses OTP ROM, while P80C52X2 uses mask ROM. Both are drop-in replacements in hardware design, though firmware must be pre-programmed for OTP parts.
P87C52X2BBD,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:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
P87C52X2BBD,157 FAQ
1.How can I place an order for P87C52X2BBD,157 through Aetrix?
Please submit a Request for Quotation (RFQ) for P87C52X2BBD,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 P87C52X2BBD,157 reliable?
The price and inventory of P87C52X2BBD,157 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for P87C52X2BBD,157 is usually 5 days.
3.What payment methods are accepted for P87C52X2BBD,157?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for P87C52X2BBD,157 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for P87C52X2BBD,157?
P87C52X2BBD,157 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your P87C52X2BBD,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 P87C52X2BBD,157?
For technical support, including P87C52X2BBD,157 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your P87C52X2BBD,157 requirements.
6.How does Aetrix verify that P87C52X2BBD,157 is sourced from the original manufacturer or authorized distributors?
All P87C52X2BBD,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 P87C52X2BBD,157 meets industry standards.
7.What is the process for return or replacement of P87C52X2BBD,157?
All P87C52X2BBD,157 units undergo pre-shipment inspection (PSI). If there is an issue with P87C52X2BBD,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 P87C52X2BBD,157 part is unused and in its original packaging.
Return procedure for P87C52X2BBD,157:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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