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NXP Semiconductors P80C31SFAA,512
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- Part No.:
- P80C31SFAA,512
- Manufacturer:
- NXP Semiconductors
- Category:
- Microcontrollers
- Package:
- 44-LCC (J-Lead)
- Datasheet:
-
P80C31SFAA,512.pdf
- Description:
- IC MCU 8BIT ROMLESS 44PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:3,833
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Product details
Overview
P80C31SFAA,512 from Philips Semiconductors is a ROMless 8-bit microcontroller based on the 8051 architecture, featuring 128 × 8 RAM, four 8-bit I/O ports (32 total lines), three 16-bit counter/timers, and a full-duplex UART with framing error detection. It operates across 2.7 V–5.5 V at up to 16 MHz and supports idle and power-down modes for low-power embedded control in industrial monitoring and sensor interface applications.
For engineers reviewing the P80C31SFAA,512 datasheet, P80C31SFAA,512 pinout, P80C31SFAA,512 application, or P80C31SFAA,512 equivalent, key selection criteria include its −40°C to +85°C temperature rating, PLCC-44 package, static CMOS design enabling zero-frequency operation, and compatibility with standard 8051 development tools and instruction set.
Technical Context
The P80C31SFAA,512 implements a static 80C51 core with full Boolean processing capability and dual data pointers. Its memory addressing supports up to 64 KB external program memory and 64 KB external data memory via multiplexed Port 0 (AD0–AD7) and Port 2 (A8–A15).
It integrates a six-source, four-priority nested interrupt system with level- and edge-triggered options (INT0/INT1), programmable clock-out on P1.0 (61 Hz–4 MHz at 16 MHz oscillator), and Timer 2 configured for capture, auto-reload, or baud-rate generation - independent of Timer 0/1 for flexible serial communication timing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| CPU Core | 8051-compatible 8-bit CISC with Boolean processor and 12-clock-per-instruction cycle |
| RAM Size | 128 × 8 bytes on-chip RAM - sufficient for small real-time control stacks and data buffers without external SRAM |
| Operating Voltage | 2.7 V to 5.5 V - enables direct interface with 3.3 V logic and legacy 5 V systems |
| Max Clock Frequency | 16 MHz - delivers 1.33 MIPS throughput; supports crystal, ceramic resonator, or external clock input |
| Power Modes | Idle mode (CPU halted, peripherals active) and power-down mode (oscillator stopped, RAM retained down to 2.0 V) |
| Interrupt System | Six sources (INT0, INT1, T0, T1, RI/TI, TF2), four priority levels, and vectorized service - suitable for deterministic response in motor control |
| Serial Interface | Full-duplex UART with automatic address recognition, framing error detection, and dual baud-rate sources (Timer 1 or Timer 2) |
Pinout & Package
Package: Plastic Leaded Chip Carrier (PLCC), 44-pin, SOT187-2 footprint, lead-free compatible per manufacturer specification.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| P0.0–P0.7 | Multiplexed AD bus | Open-drain bidirectional port; provides lower 8 bits of address/data during external memory access - requires external pull-ups |
| P1.0/T2 | Timer 2 input / I/O | Primary input for Timer 2 external count; also serves as programmable clock-out output when configured |
| P2.0–P2.7 | Upper address bus | Outputs high-order address byte (A8–A15) during 16-bit external memory accesses - retains value during 8-bit MOVX @Ri |
| P3.0/RxD, P3.1/TxD | UART interface | Full-duplex serial I/O with Schmitt-trigger inputs - supports RS-232 level-shifting or TTL-level point-to-point links |
| RST | Reset input | Active-high asynchronous reset requiring ≥2 machine cycles (24 oscillator periods); internal weak pull-down enables RC-based power-on reset |
| XTAL1/XTAL2 | Oscillator interface | Connects to crystal/resonator (1–16 MHz) or accepts external clock on XTAL1; supports stop-clock operation for ultra-low-power sleep |
Key Features
| Feature | Design Value |
|---|---|
| Static CMOS design | Enables true zero-frequency operation - CPU state preserved indefinitely during clock halt, ideal for battery-backed systems |
| Four 8-bit I/O ports | 32 individually configurable pins with internal pull-ups and Schmitt-trigger inputs - simplifies direct switch/sensor interfacing without external biasing |
| Timer 2 flexibility | Supports capture, auto-reload (up/down), and baud-rate generation simultaneously - eliminates need for external timing ICs in protocol stacks |
| Low EMI ALE control | ALE pulse can be disabled via AUXR.0 - reduces radiated emissions in noise-sensitive measurement equipment |
| ONCE™ debug mode | Enables in-circuit emulation by holding ALE low during reset - allows real-time firmware validation without socket removal |
Applications
| Industrial Sensor Node | Legacy Equipment Controller |
|---|---|
Use Scenario: Standalone temperature/humidity monitor with RS-485 interface and local LED status display. IC Role / Device Role / Timing Role: Primary controller executing polling loop, UART framing, and GPIO-driven indicator logic. Use Value: On-chip UART with framing error detection ensures robust Modbus RTU communication; 128-byte RAM accommodates protocol stack variables without external memory. | Use Scenario: Retrofit controller for aging PLC I/O modules requiring 8051-compatible firmware and 5 V TTL signal compatibility. IC Role / Device Role / Timing Role: Drop-in replacement for obsolete MCS-51 derivatives in fixed-function logic sequencers. Use Value: Pin- and code-compatible with standard 8051 toolchains; −40°C to +85°C rating ensures reliability in unconditioned cabinet environments. |
| Power Meter Firmware Host | Embedded Serial Gateway |
Use Scenario: Energy meter with pulse counting (T0/T1), LCD driver (Port 1), and isolated RS-232 telemetry (P3.0/P3.1). IC Role / Device Role / Timing Role: Real-time pulse accumulator and ASCII command parser with hardware-assisted UART timing. Use Value: Dual timer inputs (T0/T1) enable simultaneous kWh/kVARh accumulation; Timer 2 baud-rate generation decouples comms timing from main loop execution. | Use Scenario: Protocol translator between RS-485 fieldbus and USB host, using external transceivers and buffer RAM. IC Role / Device Role / Timing Role: Bridge controller managing packet assembly, checksum calculation, and flow-controlled UART handshaking. Use Value: Four-port I/O provides dedicated lines for transceiver control (DE/RE), while programmable clock-out synchronizes external FIFO timing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 8-bit microcontroller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT89C51-24PI | 4 KB on-chip Flash ROM; same 128-byte RAM, 40-pin PDIP; lacks Timer 2 and programmable clock-out | Requires no external EPROM; unsuitable for dual-baud-rate or precise clock-out requirements | Select when firmware storage is needed on-chip and Timer 2 functionality is not required |
| DS89C430MCL+ | High-speed 8051 derivative (33 MHz max); 1 KB RAM; integrated bootloader; different SFR map and power modes | Higher throughput but incompatible SFR layout; requires firmware porting and layout revision | Select only for new designs targeting performance uplift and willing to revalidate firmware and hardware |
Compared with AT89C51-24PI and DS89C430MCL+, the P80C31SFAA,512 offers guaranteed 8051 instruction-set and SFR compatibility, proven industrial temperature stability, and hardware features like Timer 2 and ONCE™ mode that simplify legacy system maintenance and field debugging - without requiring Flash programming infrastructure.
Availability
P80C31SFAA,512 is available at Aetrix Electronics and suitable for industrial sensor nodes, legacy equipment controllers, power meter firmware hosts, and embedded serial gateways requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for P80C31SFAA,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 with leadership in automotive, industrial, and connectivity solutions.
The 80C31/80C32 family was designed for cost-sensitive, low-power embedded control where ROMless operation, wide voltage range, and 8051 ecosystem compatibility were critical - targeting instrumentation, factory automation, and retrofit applications.
FAQ
What is the maximum operating frequency of the P80C31SFAA,512?
The P80C31SFAA,512 is rated for a maximum operating frequency of 16 MHz at 2.7 V–5.5 V supply. This corresponds to a throughput of approximately 1.33 million instructions per second (MIPS) under standard 12-clock-per-instruction execution. The device's static CMOS design permits operation down to 0 Hz, enabling ultra-low-power stop-clock modes without data loss.
Does the P80C31SFAA,512 include on-chip program memory?
No, the P80C31SFAA,512 is a ROMless microcontroller. It contains 128 × 8 bytes of on-chip RAM but no internal program memory. Code execution must occur from external EPROM or Flash memory mapped to the 64 KB program space, accessed via PSEN and the multiplexed Port 0/Port 2 address/data bus.
How does the P80C31SFAA,512 support low-power operation?
The P80C31SFAA,512 supports two software-selectable low-power modes: Idle mode halts the CPU while preserving RAM, timers, UART, and interrupts; Power-down mode stops the oscillator entirely, retaining RAM contents down to 2.0 V. Wake-up from Power-down is enabled via external interrupt (INT0/INT1) or hardware reset - both fully supported on the P80C31SFAA,512.
What package type is used for the P80C31SFAA,512?
The P80C31SFAA,512 uses a 44-pin Plastic Leaded Chip Carrier (PLCC) package, designated SOT187-2. It features a square body with J-leads, supports surface-mount assembly, and is rated for operation from −40°C to +85°C - matching the "F" temperature grade indicated in the part number suffix.
Can the P80C31SFAA,512 generate a precise clock output?
Yes, the P80C31SFAA,512 can generate a precise 50% duty-cycle clock output on P1.0 using Timer 2 in clock-out mode. At 16 MHz operation, the output frequency ranges from 61 Hz to 4 MHz, determined by the reload values in RCAP2H/RCAP2L. This feature is confirmed in the official Philips datasheet and requires configuring T2CON and T2MOD registers - no external components are needed.
P80C31SFAA,512 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Package/Case:
- 44-LCC (J-Lead)
- Series:
- 80C
- Packaging:
- Tube
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Core Processor:
- 8051
- Core Size:
- 8-Bit
- Speed:
- 16MHz
- Connectivity:
- UART/USART
- Peripherals:
- POR
- Number of I/O:
- 32
- Program Memory Size:
- -
- Program Memory Type:
- ROMless
- EEPROM Size:
- -
- RAM Size:
- 128 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:
P80C31SFAA,512 FAQ
1.How can I place an order for P80C31SFAA,512 through Aetrix?
Please submit a Request for Quotation (RFQ) for P80C31SFAA,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 P80C31SFAA,512 reliable?
The price and inventory of P80C31SFAA,512 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for P80C31SFAA,512 is usually 5 days.
3.What payment methods are accepted for P80C31SFAA,512?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for P80C31SFAA,512 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for P80C31SFAA,512?
P80C31SFAA,512 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your P80C31SFAA,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 P80C31SFAA,512?
For technical support, including P80C31SFAA,512 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your P80C31SFAA,512 requirements.
6.How does Aetrix verify that P80C31SFAA,512 is sourced from the original manufacturer or authorized distributors?
All P80C31SFAA,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 P80C31SFAA,512 meets industry standards.
7.What is the process for return or replacement of P80C31SFAA,512?
All P80C31SFAA,512 units undergo pre-shipment inspection (PSI). If there is an issue with P80C31SFAA,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 P80C31SFAA,512 part is unused and in its original packaging.
Return procedure for P80C31SFAA,512:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
P80C31SFAA,512 Tags
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