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NXP Semiconductors P80C31SBBB,557
- Part No.:
- P80C31SBBB,557
- Manufacturer:
- NXP Semiconductors
- Category:
- Microcontrollers
- Package:
- 44-QFP
- Datasheet:
-
P80C31SBBB,557.pdf
- Description:
- IC MCU 8BIT ROMLESS 44PQFP
- Quantity:
- Payment:
- Shipping:
Inventory:2,526
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Product details
Overview
P80C31SBBB,557 from Philips Semiconductors is a ROMless 8-bit microcontroller based on the 80C51 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 P80C31SBBB,557 datasheet, P80C31SBBB,557 pinout, P80C31SBBB,557 application, or P80C31SBBB,557 equivalent, key selection considerations include its static CMOS design enabling zero-frequency operation, dual data pointers for efficient external memory access, and hardware interrupt structure with six sources and four priority levels.
Technical Context
The P80C31SBBB,557 implements a static 80C51 core with Boolean processor support and full compatibility with MCS-51 instruction set. 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 an on-chip oscillator with XTAL1/XTAL2 pins, programmable clock-out on P1.0 (61 Hz–4 MHz at 16 MHz VCC), and Timer 2 configured for capture, auto-reload, or baud-rate generation - independent of Timer 1 for asynchronous serial communication with separate transmit/receive clock sources.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| CPU Core | 80C51-compatible 8-bit static CMOS CPU with Boolean processor - enables deterministic zero-clock operation and low EMI via ALE inhibit. |
| RAM Size | 128 × 8 internal RAM - sufficient for stack, register banks, and small real-time buffers without external SRAM. |
| Max Clock Frequency | 16 MHz at 2.7–5.5 V - supports real-time control loops with ≤62.5 ns instruction cycle time (12-cycle architecture). |
| I/O Ports | Four 8-bit bidirectional ports (P0–P3) with Schmitt-trigger inputs and internal pull-ups - P0 doubles as AD0–AD7 multiplexed bus; P2 as A8–A15 high address bus. |
| Timers/Counters | Three 16-bit timers/counters (T0, T1, T2) - T2 supports capture, reload, and independent baud-rate generation for UART modes 1/3. |
| Interrupt System | Six interrupt sources (INT0, INT1, T0, T1, Serial, T2) with four priority levels - enables nested servicing for time-critical sensor or comms events. |
| Power Modes | Idle mode (CPU halted, peripherals active) and power-down mode (oscillator stopped, RAM retained down to 2.0 V) - reduces system standby current to µA range. |
Pinout & Package
Package: Plastic Quad Flat Pack (PQFP), 44-pin, SOT307-2 footprint, lead-free compatible per Philips specification.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| P0.0–P0.7 | Multiplexed Address/Data Bus (AD0–AD7) | Open-drain I/O with strong internal pull-ups during external memory access - requires external pull-ups for general-purpose use. |
| P1.0/T2 | Timer 2 External Input / Clock-Out | Configurable as T2 count input or 50% duty-cycle programmable clock output (61 Hz–4 MHz) - no external crystal needed for timing reference. |
| P2.0–P2.7 | High-Order Address Bus (A8–A15) | Drives upper address byte during 16-bit MOVX @DPTR - enables direct access to 64 KB external data memory space. |
| P3.0/RxD, P3.1/TxD | Full-Duplex UART Interface | Asynchronous serial port with framing error detection and automatic address recognition - supports multi-processor communication without software overhead. |
| RST | Reset Input | Active-high reset requiring ≥2 machine cycles (24 oscillator periods); internal diffused resistor allows RC-based power-on reset. |
| XTAL1/XTAL2 | Oscillator Inputs | Supports crystal (1–16 MHz), ceramic resonator, or external clock drive - enables precise timing for UART baud rates and timer accuracy. |
Key Features
| Feature | Design Value |
|---|---|
| Static CMOS Core | Zero-frequency operation with clock stop/resume capability - eliminates dynamic power loss and enables ultra-low-power sleep states. |
| Dual Data Pointers | Two independent DPTR registers (DPH/DPL) - accelerates block memory transfers between internal RAM and external data memory. |
| Programmable Clock-Out | 50% duty-cycle clock on P1.0 derived from Timer 2 - replaces external clock generator ICs in peripheral timing applications. |
| Low-EMI ALE Control | Software-disableable ALE via AUXR.0 - suppresses spurious address latching noise during critical analog or RF-sensitive operations. |
| Asynchronous Port Reset | Hardware reset triggered by RST pin only - avoids false resets from noise on other pins; no watchdog dependency required. |
Applications
| Industrial Sensor Node | Legacy Equipment Controller |
|---|---|
Use Scenario: Standalone temperature/humidity node with RS-485 interface and local LED status feedback. IC Role / Device Role / Timing Role: Main controller executing polling loop, UART framing, and GPIO-driven indicator logic. Use Value: 128-byte RAM suffices for protocol buffers; idle mode extends battery life; UART framing error detection ensures robust field communication. | Use Scenario: Retrofit PLC I/O module replacing obsolete discrete TTL logic with programmable scan logic. IC Role / Device Role / Timing Role: Real-time I/O scanner managing 32 digital inputs/outputs and serial HMI link. Use Value: Four 8-bit ports map directly to DIN rail I/O headers; 16 MHz timing meets 10 ms scan cycle; power-down mode enables safe firmware update. |
| Medical Diagnostic Peripheral | Automotive Body Control Module |
Use Scenario: Portable blood glucose meter with LCD driver, button interface, and USB-to-serial bridge. IC Role / Device Role / Timing Role: Host MCU handling sensor ADC interface (via external converter), display refresh, and serial command parsing. Use Value: Six interrupt sources manage button press, low-battery alert, and serial RX events concurrently; 2.7 V minimum VCC supports single-cell Li-ion operation. | Use Scenario: Door lock actuator controller with CAN transceiver interface (external), relay drivers, and wake-on-LIN capability. IC Role / Device Role / Timing Role: Secondary controller coordinating lock/unlock sequencing and fault reporting over LIN bus. Use Value: Power-down mode with external interrupt wakeup (INT0/INT1) enables <10 µA standby current; T2 baud-rate independence allows stable LIN timing despite main clock variation. |
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, 24 MHz max, PDIP-40 package | Eliminates need for external EPROM; lacks Timer 2 and programmable clock-out | Select when firmware storage and reprogrammability outweigh advanced timing features. |
| STC89C52RC-PDIP40 | 8 KB Flash, 512-byte RAM, 35 MHz max, enhanced UART with frame error flag | Higher memory and speed; different SFR layout and reset behavior; no PQFP-44 option | Select for cost-sensitive volume production where extended RAM and Flash justify migration effort. |
Compared with AT89C51-24PI and STC89C52RC-PDIP40, the P80C31SBBB,557 offers unique value in ROMless flexibility for mask-ROM-based systems, PQFP-44 packaging for space-constrained PCBs, and Timer 2's dual-role capability for simultaneous UART timing and peripheral clock generation - features absent in both alternatives.
Availability
P80C31SBBB,557 is available at Aetrix Electronics and suitable for industrial sensor nodes, legacy equipment controllers, medical diagnostic peripherals, and automotive body control modules requiring stable component supply across extended temperature ranges (0°C to +70°C).
Supply support for P80C31SBBB,557 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 leader in high-reliability mixed-signal ICs, with deep heritage in 8-bit microcontroller innovation and industrial-grade process technology.
The 80C31/80C32 family was designed specifically for ROMless embedded control in cost-sensitive, low-power, and electrically noisy environments - emphasizing static operation, wide voltage tolerance, and hardware-assisted serial communication.
FAQ
What is the maximum operating frequency of the P80C31SBBB,557?
The P80C31SBBB,557 is rated for a maximum operating frequency of 16 MHz across its specified voltage range of 2.7 V to 5.5 V. This corresponds to a 12-clock-per-instruction cycle, yielding a 1.08 µs minimum instruction execution time. Operation above 16 MHz is not guaranteed and may result in timing violations or undefined behavior per the 2000 Philips datasheet.
Does the P80C31SBBB,557 include on-chip program memory?
No, the P80C31SBBB,557 is a ROMless device with zero bytes of on-chip program memory. It executes code exclusively from external program memory accessed via PSEN and the multiplexed Port 0/Port 2 address/data bus. This architecture allows flexible firmware updates using external EPROM or Flash, but requires external memory circuitry for operation.
How does the power-down mode function on the P80C31SBBB,557?
In power-down mode, the P80C31SBBB,557 stops the oscillator while retaining RAM and SFR contents down to 2.0 V. Wake-up is supported via hardware reset or external interrupts on INT0/INT1 (level-sensitive). The P80C31SBBB,557 has wakeup-from-power-down always enabled - no AUXR1 configuration is required, unlike later variants with WUPD bit control.
What are the key differences between P80C31SBBB,557 and P80C32SBBB,557?
The P80C31SBBB,557 contains 128 × 8 RAM and no on-chip ROM, while the P80C32SBBB,557 provides 256 × 8 RAM and is also ROMless. Both share identical pinout, package (PQFP-44), voltage range, and peripheral set. The RAM size difference directly impacts stack depth, buffer capacity, and multitasking headroom in real-time applications.
Can the P80C31SBBB,557 generate a precise clock output for external peripherals?
Yes, the P80C31SBBB,557 can generate a precise 50% duty-cycle clock on P1.0 using Timer 2 in clock-out mode. At 16 MHz VCC, the output frequency ranges from 61 Hz to 4 MHz, determined by the RCAP2H/RCAP2L reload value. This eliminates the need for external clock generators in applications such as ADC sampling clocks or display refresh timing.
P80C31SBBB,557 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Package/Case:
- 44-QFP
- Series:
- 80C
- Packaging:
- Tray
- 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:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
P80C31SBBB,557 FAQ
1.How can I place an order for P80C31SBBB,557 through Aetrix?
Please submit a Request for Quotation (RFQ) for P80C31SBBB,557 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 P80C31SBBB,557 reliable?
The price and inventory of P80C31SBBB,557 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for P80C31SBBB,557 is usually 5 days.
3.What payment methods are accepted for P80C31SBBB,557?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for P80C31SBBB,557 transactions.
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4.How is shipping managed for P80C31SBBB,557?
P80C31SBBB,557 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your P80C31SBBB,557 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 P80C31SBBB,557?
For technical support, including P80C31SBBB,557 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your P80C31SBBB,557 requirements.
6.How does Aetrix verify that P80C31SBBB,557 is sourced from the original manufacturer or authorized distributors?
All P80C31SBBB,557 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 P80C31SBBB,557 meets industry standards.
7.What is the process for return or replacement of P80C31SBBB,557?
All P80C31SBBB,557 units undergo pre-shipment inspection (PSI). If there is an issue with P80C31SBBB,557, 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 P80C31SBBB,557 part is unused and in its original packaging.
Return procedure for P80C31SBBB,557:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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