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NXP Semiconductors P80C32UFBB,557
- Part No.:
- P80C32UFBB,557
- Manufacturer:
- NXP Semiconductors
- Category:
- Microcontrollers
- Package:
- 44-QFP
- Datasheet:
-
P80C32UFBB,557.pdf
- Description:
- IC MCU 8BIT ROMLESS 44PQFP
- Quantity:
- Payment:
- Shipping:
Inventory:2,268
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Product details
Overview
P80C32UFBB,557 from NXP Semiconductors (formerly Philips) is a ROMless 8-bit microcontroller based on the 80C51 architecture, featuring 256 × 8 RAM, three 16-bit counter/timers, full-duplex UART with framing error detection, and operation across 2.7 V–5.5 V at up to 33 MHz. It serves as a core embedded controller in industrial I/O modules, legacy instrumentation, and low-power sensor interface systems requiring static operation and software-controllable power modes.
For engineers reviewing the P80C32UFBB,557 datasheet, P80C32UFBB,557 pinout, P80C32UFBB,557 application, or P80C32UFBB,557 equivalent, this page delivers verified technical context, validated pin functions for PQFP-44, real-world use cases in temperature-stable industrial control, and two confirmed alternative parts with documented functional and packaging differences.
Technical Context
The P80C32UFBB,557 implements a static CMOS 80C51 core with full Boolean processing, dual data pointers, and a six-source, four-priority nested interrupt system. Its memory addressing supports up to 64 KB external program and 64 KB external data space, enabling expansion beyond on-chip resources.
It integrates an on-chip oscillator with XTAL1/XTAL2, programmable clock-out on P1.0 (61 Hz–4 MHz at 16 MHz), and Timer 2 operating in capture, auto-reload (up/down), or baud-rate generator modes - with RCLK/TCLK bits enabling independent UART receive/transmit clock sources.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Core Architecture | 80C51-compatible 8-bit CPU with Boolean processor and static design - enables zero-frequency operation and deterministic stop/resume execution. |
| RAM Size | 256 × 8 bytes on-chip RAM - sufficient for small real-time control stacks and UART buffering without external SRAM. |
| Max Clock Frequency | 33 MHz at VCC = 5 V - delivers ~33 million instructions/sec (12-cycle per instruction), suitable for high-speed serial protocol handling. |
| Supply Voltage Range | 2.7 V to 5.5 V - supports battery-backed operation down to 2.7 V and interoperability with 3.3 V or 5 V logic domains. |
| 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-level. |
| UART Features | Full-duplex enhanced UART with framing error detection and automatic address recognition - enables reliable multi-drop RS-485 communication without external protocol assist. |
| Timer Resources | Three 16-bit timers/counters, including Timer 2 with capture, reload, and baud-rate generation - allows simultaneous PWM generation, event timing, and independent UART clocking. |
Pinout & Package
Package: Plastic Quad Flat Pack (PQFP), 44-pin, body size 10 mm × 10 mm, lead pitch 0.8 mm (SOT307-2 drawing).
| 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 for general-purpose I/O use. |
| P1.0/T2 | General I/O / Timer 2 external count input | Configurable as Timer 2 clock input or programmable 50% duty cycle clock output (61 Hz–4 MHz). |
| P1.1/T2EX | General I/O / Timer 2 capture/reload control | Triggers Timer 2 capture or reload on falling edge; also controls up/down counting direction when DCEN = 1. |
| P2.0–P2.7 | Bidirectional I/O / A8–A15 | Provides high-order address byte during 16-bit external memory accesses; retains port latch value during 8-bit MOVX @Ri. |
| P3.0/RxD & P3.1/TxD | Serial I/O | Full-duplex UART interface with Schmitt-trigger inputs; supports modes 0–3 with framing error detection and address recognition. |
| RST | Active-high reset input | Requires ≥2 machine cycles (24 oscillator periods) high pulse; internal weak pull-down enables power-on reset with single capacitor. |
| XTAL1 / XTAL2 | Oscillator input/output | Supports crystal (1–33 MHz), ceramic resonator, or external CMOS clock; XTAL2 unconnected when using external clock source. |
| EA/VPP | External access enable | Must be held low to execute code from external program memory (0000H–0FFFH); tied high for internal-only operation (not applicable - ROMless device). |
Key Features
| Feature | Design Value |
|---|---|
| Static CMOS design | Enables true zero-frequency operation and deterministic stop/resume - critical for low-power wake-up and step-by-step debugging. |
| Four-level priority interrupt system | Allows nested servicing of six interrupt sources (INT0, INT1, T0, T1, serial, T2) with configurable preemption - ensures timely response in real-time control loops. |
| Programmable clock-out on P1.0 | Generates precise 50% duty cycle clocks (61 Hz–4 MHz) without external components - simplifies timing reference for ADCs or external logic. |
| Timer 2 baud-rate independence | RCLK/TCLK bits allow UART receive and transmit clocks to derive from different timers - enables asymmetric baud rates (e.g., 9600 Rx / 115200 Tx). |
| Low EMI ALE inhibit | AUXR.0 bit disables ALE pulses except during MOVX - reduces electromagnetic emissions in noise-sensitive analog or RF-adjacent designs. |
| ONCE™ debug mode | Enables in-circuit emulation via ALE/PSEN handshake - permits hardware-in-the-loop testing without removing P80C32UFBB,557 from PCB. |
Applications
| Industrial PLC I/O Module | Legacy Test Equipment Controller |
|---|---|
|
Use Scenario: Standalone digital I/O expansion module in DIN-rail mounted PLCs, interfacing with 24 V sensors and actuators via optocoupled inputs/outputs. IC Role / Device Role: Primary controller managing parallel port scanning, timer-based pulse-width modulation for valve control, and Modbus RTU over RS-485. Use Value: 256-byte RAM and three timers support concurrent I/O state tracking, 100 ms watchdog timeout, and UART frame assembly - eliminating need for external logic. |
Use Scenario: Embedded controller in benchtop multimeters and signal generators where firmware updates are infrequent and long-term component availability is critical. IC Role / Device Role: System supervisor coordinating LCD display refresh, keypad scan, DAC calibration routines, and GPIB/RS-232 host communication. Use Value: Static operation and Power-down mode reduce standby power to <10 µA - extends battery life in portable test gear; ROMless design allows field-programmable EPROM boot loader. |
| Temperature-Stable Sensor Interface | Low-Power Remote Data Logger |
|
Use Scenario: Environmental monitoring node deployed in HVAC ducts or outdoor enclosures, operating continuously across –40°C to +85°C. IC Role / Device Role: Signal conditioner and protocol translator converting analog thermistor/RTD readings into ASCII packets transmitted via UART to gateway. Use Value: Extended temperature rating (–40°C to +85°C) and 2.7 V minimum supply ensure reliable operation during brownout conditions; internal oscillator eliminates crystal aging drift. |
Use Scenario: Battery-powered soil moisture logger sampling every 15 minutes, transmitting data via LoRaWAN gateway using UART-to-modem bridge. IC Role / Device Role: Sleep/wake coordinator: wakes on RTC interrupt, reads ADC, formats packet, triggers modem, then enters Power-down mode until next cycle. Use Value: Wake-up from Power-down via INT0/INT1 preserves RAM contents and avoids full reinitialization - cuts wake latency to <10 µs and extends 2xAA battery life to >2 years. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 8-bit microcontroller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT89C51RC2-SP | On-chip 32 KB Flash (vs. ROMless), 512 B RAM, same 44-pin PQFP package, but max 40 MHz and no T2EX/T2 pin functions. | Eliminates external EPROM requirement but lacks Timer 2 capture capability needed for quadrature encoder input. | Select only if Flash integration outweighs loss of T2EX-based event capture and extended voltage range (2.7–5.5 V). |
| STC89C52RC-PD | Enhanced 8051 core, 8 KB Flash, 512 B RAM, 6-channel PWM, but operates only at 5 V ±10% and uses non-standard reset timing. | Offers higher integration (ADC, PWM) but incompatible with 2.7–3.6 V battery rails and requires board-level reset circuit redesign. | Choose only for cost-sensitive new designs where 5 V supply is guaranteed and legacy timing compatibility is not required. |
Compared with AT89C51RC2-SP and STC89C52RC-PD, the P80C32UFBB,557 provides guaranteed 2.7–5.5 V operation, full Timer 2 feature set (capture, reload, baud rate), and industrial temperature support - making it irreplaceable in brownout-prone or precision timing applications where ROMless flexibility and static design are mandatory.
Availability
P80C32UFBB,557 is available at Aetrix Electronics and suitable for industrial PLC I/O modules, legacy test equipment controllers, and temperature-stable sensor interfaces requiring stable component supply across extended lifecycle windows.
Supply support for P80C32UFBB,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
NXP Semiconductors (formerly Philips Semiconductors) is a global leader in high-reliability mixed-signal ICs, with deep heritage in 8-bit microcontrollers and industrial interface solutions.
The P80C32UFBB,557 belongs to the 80C51 family - designed specifically for cost-sensitive, long-lifecycle embedded control applications demanding static operation, wide voltage tolerance, and proven peripheral compatibility across decades of deployment.
FAQ
What is the maximum operating frequency of the P80C32UFBB,557?
The P80C32UFBB,557 supports a maximum operating frequency of 33 MHz at VCC = 5 V. This is explicitly specified in the Philips 80C31/80C32 Product Specification (2000 Aug 07) under "TWO speed ranges at VCC = 5 V" - distinguishing it from the 0–16 MHz variants. Operation above 16 MHz requires the 'U' speed grade designation in the part number, which P80C32UFBB,557 carries.
Does the P80C32UFBB,557 include on-chip program memory?
No, the P80C32UFBB,557 is a ROMless device - it contains no on-chip program memory and must execute code from external EPROM, Flash, or ROM. This is confirmed in the "SELECTION TABLE" and "DESCRIPTION" sections of the Philips datasheet, which classify 80C32 as "ROMless" with 0K internal program memory, relying on EA/VPP pin control for external memory access.
What package type does P80C32UFBB,557 use, and how many pins does it have?
The P80C32UFBB,557 uses a 44-pin Plastic Quad Flat Pack (PQFP) per SOT307-2 drawing. The 'BB' suffix in the part number denotes PQFP packaging, and the datasheet's "80C32 ORDERING INFORMATION" table explicitly lists P80C32UFB B (with space omitted) as –40°C to +85°C PQFP variant - matching the full P80C32UFBB,557 designation.
Can the P80C32UFBB,557 operate from a 3.3 V supply?
Yes, the P80C32UFBB,557 supports operation from 2.7 V to 5.5 V, fully encompassing 3.3 V nominal supplies. The datasheet specifies "low voltage (2.7 V–5.5 V)" and confirms functionality at 16 MHz down to 2.7 V - making it compatible with 3.3 V logic families without level-shifting, provided clock frequency is derated per DC characteristics.
What is the function of the T2EX pin (P1.1) on the P80C32UFBB,557?
On the P80C32UFBB,557, P1.1 serves as T2EX - the Timer 2 external enable/capture input. When EXEN2 = 1, a falling edge on T2EX triggers capture of TL2/TH2 into RCAP2L/RCAP2H or reloads the timer; it also controls up/down counting direction when DCEN = 1. This function is documented in the "PIN DESCRIPTIONS" and "TIMER 2 OPERATION" sections of the official Philips specification.
P80C32UFBB,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:
- 33MHz
- Connectivity:
- UART/USART
- Peripherals:
- POR
- Number of I/O:
- 32
- Program Memory Size:
- -
- Program Memory Type:
- ROMless
- 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:
P80C32UFBB,557 FAQ
1.How can I place an order for P80C32UFBB,557 through Aetrix?
Please submit a Request for Quotation (RFQ) for P80C32UFBB,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 P80C32UFBB,557 reliable?
The price and inventory of P80C32UFBB,557 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for P80C32UFBB,557 is usually 5 days.
3.What payment methods are accepted for P80C32UFBB,557?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for P80C32UFBB,557 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for P80C32UFBB,557?
P80C32UFBB,557 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your P80C32UFBB,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 P80C32UFBB,557?
For technical support, including P80C32UFBB,557 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your P80C32UFBB,557 requirements.
6.How does Aetrix verify that P80C32UFBB,557 is sourced from the original manufacturer or authorized distributors?
All P80C32UFBB,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 P80C32UFBB,557 meets industry standards.
7.What is the process for return or replacement of P80C32UFBB,557?
All P80C32UFBB,557 units undergo pre-shipment inspection (PSI). If there is an issue with P80C32UFBB,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 P80C32UFBB,557 part is unused and in its original packaging.
Return procedure for P80C32UFBB,557:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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