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NXP Semiconductors P80C32UBAA,518
- Part No.:
- P80C32UBAA,518
- Manufacturer:
- NXP Semiconductors
- Category:
- Microcontrollers
- Package:
- 44-LCC (J-Lead)
- Datasheet:
-
P80C32UBAA,518.pdf
- Description:
- IC MCU 8BIT ROMLESS 44PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:4,583
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Product details
Overview
P80C32UBAA,518 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 low-power, static-core embedded controller for industrial I/O subsystems requiring external program memory and deterministic real-time interrupt handling.
For engineers reviewing the P80C32UBAA,518 datasheet, P80C32UBAA,518 pinout, P80C32UBAA,518 application, or P80C32UBAA,518 equivalent, this device is selected for legacy 8051-based designs needing high-speed (33 MHz) execution, dual data pointers, four priority-level nested interrupts, and wake-up-from-power-down capability via INT0/INT1 - all in a 44-pin PLCC package with 0°C to +70°C temperature range.
Technical Context
The P80C32UBAA,518 implements a static CMOS 80C51 core with full backward compatibility to MCS-51 instruction set, supporting zero-frequency operation and two software-selectable power modes: idle (CPU halted, peripherals active) and power-down (oscillator stopped, RAM retained). Its 44-pin Plastic Leaded Chip Carrier (PLCC, SOT187-2) maps Port 0 as multiplexed AD0–AD7, Port 2 as A8–A15, and includes dedicated T2/T2EX pins for Timer 2 capture/reload functionality.
It integrates a programmable clock-out on P1.0 (50% duty cycle, 61 Hz–4 MHz at 16 MHz), hardware UART with automatic address recognition, and six interrupt sources (INT0, INT1, T0, T1, serial, T2) with four priority levels. The device lacks on-chip ROM but supports external code fetch via PSEN and uses ALE for address latching during external memory access.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Core Architecture | 80C51 8-bit CISC CPU with Boolean processor and full static design - enables clock stop/resume without data loss. |
| RAM Size | 256 × 8 bytes on-chip - sufficient for stack, register banks, and small data buffers without external RAM in basic applications. |
| Max Operating Frequency | 33 MHz at VCC = 5 V - delivers ~33 million instructions/sec (12-cycle per instruction), enabling real-time control loops & UART comms at >1 Mbps. |
| Supply Voltage Range | 2.7 V to 5.5 V - supports battery-backed or mixed-voltage systems; low-voltage operation down to 2.7 V at ≤16 MHz. |
| Power Modes | Idle mode (CPU frozen, RAM/timers/UART/interrupts active) and Power-down mode (oscillator halted, RAM retained down to 2.0 V). |
| Interrupt System | Six sources, four priority levels, nested structure - allows prioritized response to critical events like serial framing errors or timer overflows. |
| Serial Interface | Full-duplex UART with framing error detection, automatic address recognition, and dual baud-rate generation (Timer 1 or Timer 2). |
Pinout & Package
Package: 44-pin Plastic Leaded Chip Carrier (PLCC), SOT187-2, body size 16.6 mm × 16.6 mm, lead pitch 1.27 mm, operating temperature range 0°C to +70°C.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | NIC | No internal connection - must be left unconnected or tied to ground per layout guidelines to avoid noise coupling. |
| 2–9 | P1.0–P1.7 | Port 1 bidirectional I/O with Schmitt-trigger inputs; P1.0/T2 and P1.1/T2EX support Timer 2 capture/reload and clock-out functions. |
| 10 | RST | Active-high reset input requiring ≥2 machine cycles (24 oscillator periods); internal pull-down enables power-on reset with external capacitor. |
| 11, 13–19 | P3.0–P3.7 | Port 3 with alternate functions: RxD/TxD (serial), INT0/INT1 (level-sensitive external interrupts), T0/T1 (timer inputs), WR/RD (external memory strobes). |
| 20–21 | XTAL2 / XTAL1 | Oscillator output/input pair - accepts crystal (1–33 MHz) or external clock source; XTAL2 unconnected when using external clock. |
| 22 | VSS | Ground reference (0 V) - requires low-impedance connection to system ground plane for noise immunity. |
| 23 | NIC | No internal connection - electrically isolated; avoid routing signals or power near this pin. |
| 24–31 | P2.0–P2.7 | Port 2 outputs high-order address A8–A15 during external program/data fetches; retains P2 register value during 8-bit MOVX @Ri operations. |
| 32–35 | PSEN / ALE / EA/VPP / NIC | PSEN enables external program memory read; ALE latches P0 address/data; EA/VPP selects internal/external code; Pin 34 is NIC. |
| 36–43 | P0.7–P0.0 | Port 0 bidirectional open-drain I/O with internal pull-ups; multiplexes AD7–AD0 (address/data bus) during external memory access. |
| 44 | VCC | Power supply input (2.7–5.5 V) - requires local 100 nF ceramic decoupling capacitor placed within 5 mm of pin. |
Key Features
| Feature | Design Value |
|---|---|
| Static CMOS Core | Enables true zero-frequency operation and seamless clock stop/resume - critical for ultra-low-power intermittent sensing applications. |
| Dual Data Pointers (DPTR) | Allows simultaneous access to two independent data spaces (e.g., lookup table + buffer) without register bank switching overhead. |
| Timer 2 with Capture/Auto-reload/Baud Rate Modes | Supports precise event timing, pulse-width measurement, and independent transmit/receive baud rate generation - eliminates need for external timers. |
| Programmable Clock-Out on P1.0 | Generates clean 50% duty-cycle clock (61 Hz–4 MHz at 16 MHz) for synchronizing external logic or ADC sampling without extra oscillator components. |
| Low-EMI ALE Inhibit | AUXR.0 bit disables ALE pulses except during MOVX - reduces radiated emissions in EMC-sensitive industrial environments. |
| Wake-up from Power-Down via INT0/INT1 | Allows external sensors or communication lines to resume full operation in <10 ms after VCC restoration - ideal for battery-powered remote nodes. |
Applications
| Industrial PLC I/O Module | Legacy Automotive Body Controller |
|---|---|
|
Use Scenario: Standalone digital I/O expansion node interfacing with 24 V sensors and solenoids via optocouplers and level shifters. IC Role / Device Role / Timing Role: Primary 8051-compatible controller executing ladder logic scan cycles, managing serial Modbus RTU communication, and servicing real-time edge-triggered interrupts from safety interlocks. Use Value: 33 MHz speed ensures sub-millisecond scan times; 256-byte RAM accommodates I/O image and protocol buffers; PLCC package enables robust rework in high-vibration environments. |
Use Scenario: Door lock/unlock and window lift control unit in pre-2005 vehicle platforms requiring CAN-free point-to-point wiring. IC Role / Device Role / Timing Role: Central MCU coordinating relay drivers, debounce logic, and LIN-compatible UART messaging using Timer 2 for precise baud rate stability. Use Value: Low-voltage operation (2.7 V) maintains function during cranking dips; power-down mode extends battery life during vehicle sleep; INT0 wake-up responds to door handle switch within 5 ms. |
| Medical Infusion Pump Controller | Test Equipment Firmware Loader |
|
Use Scenario: Safety-critical motor control subsystem verifying stepper position via quadrature encoder and monitoring occlusion pressure sensors. IC Role / Device Role / Timing Role: Real-time executor of closed-loop PID routines with deterministic interrupt latency; UART handles configuration updates and diagnostic logging. Use Value: Four-level priority interrupts guarantee immediate response to emergency stop signals; static core prevents timing drift under thermal stress; 256-byte RAM stores calibration coefficients and fault history. |
Use Scenario: Field-upgradable firmware loader for embedded instruments using RS-232 or USB-to-serial adapters. IC Role / Device Role / Timing Role: Bootloader MCU that validates checksummed HEX files, programs external Flash via parallel interface, and verifies write integrity before handoff to main application. Use Value: External program memory support (PSEN/ALE) enables flexible code storage; programmable clock-out synchronizes Flash write cycles; dual DPTR accelerates block verification. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 8051-based microcontroller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT89C51RC2-UM | On-chip 32 KB Flash ROM, 1280-byte RAM, built-in ISP; operates up to 40 MHz but requires 4.0–5.5 V only. | Eliminates need for external EPROM/Flash and address decoding logic; not suitable for 2.7 V battery operation. | Select when firmware update-in-place is required and supply voltage is stable ≥4.0 V. |
| STC89C52RC-PD | 8 KB Flash, 512-byte RAM, 6-clock-per-machine-cycle core (6x faster than 12-clock 80C51), 3.3–5.5 V operation. | Higher throughput and lower EMI due to reduced clock harmonics; lacks T2EX pin and ONCE debug mode. | Select for cost-sensitive consumer products where legacy 80C51 timing compatibility is non-critical and debug via ISP suffices. |
Compared with AT89C51RC2-UM and STC89C52RC-PD, the P80C32UBAA,518 offers guaranteed 2.7 V operation, proven PLCC reliability in industrial settings, and ONCE-mode debug capability - making it irreplaceable in maintenance of long-lifecycle 8051-based equipment where external memory architecture and voltage flexibility are mandatory.
Availability
P80C32UBAA,518 is available at Aetrix Electronics and suitable for industrial PLC I/O modules, legacy automotive body controllers, and medical infusion pump controllers requiring stable component supply across extended product lifecycles.
Supply support for P80C32UBAA,518 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 acquired Philips Semiconductors in 2006 and continues to support legacy 80C51-family products with documentation, cross-reference tools, and long-term supply assurance.
The P80C32UBAA,518 belongs to the 80C51 microcontroller family designed for cost-effective, low-power embedded control in industrial automation, automotive subsystems, and instrumentation where 8051 software compatibility and external memory flexibility are essential.
FAQ
What is the maximum operating frequency and voltage range for the P80C32UBAA,518?
The P80C32UBAA,518 operates at up to 33 MHz when supplied with 5 V, and supports a wide voltage range of 2.7 V to 5.5 V. At 2.7 V, maximum frequency is limited to 16 MHz per Philips specification. This dual-range capability allows deployment in both battery-powered and mains-derived systems without redesigning the power supply.
Does the P80C32UBAA,518 include on-chip program memory?
No, the P80C32UBAA,518 is a ROMless device - it contains no internal program memory and relies entirely on external EPROM, Flash, or ROM accessed via PSEN, ALE, and the multiplexed Port 0/Port 2 bus. This architecture provides full flexibility for field-upgradable firmware and large code sizes beyond on-chip limits.
How does the P80C32UBAA,518 enter and exit Power-down mode?
The P80C32UBAA,518 enters Power-down mode via software instruction writing to PCON register (bit PD = 1). It exits via hardware reset or enabled external interrupt (INT0/INT1), provided VCC has been restored to ≥2.7 V and held stable for oscillator startup. WUPD bit in AUXR1 controls interrupt wake-up enablement.
What are the key differences between the P80C32UBAA,518 and the P80C31 variant?
The P80C32UBAA,518 includes 256 × 8 RAM (vs. 128 × 8 in P80C31) and adds Timer 2 with capture, auto-reload, and baud-rate generator modes - enabling independent UART receive/transmit clocks and precise event timing. Both share identical pinout, instruction set, and power management features.
Is the P80C32UBAA,518 compatible with modern 8051 development tools?
Yes, the P80C32UBAA,518 is fully instruction- and timing-compatible with standard 8051 toolchains including Keil µVision, SDCC, and IAR Embedded Workbench. Its ONCE-mode debug interface also supports legacy in-circuit emulators, ensuring seamless integration into existing firmware maintenance workflows.
P80C32UBAA,518 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Package/Case:
- 44-LCC (J-Lead)
- Series:
- 80C
- Packaging:
- Tape & Reel (TR)
- 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:
P80C32UBAA,518 FAQ
1.How can I place an order for P80C32UBAA,518 through Aetrix?
Please submit a Request for Quotation (RFQ) for P80C32UBAA,518 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 P80C32UBAA,518 reliable?
The price and inventory of P80C32UBAA,518 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for P80C32UBAA,518 is usually 5 days.
3.What payment methods are accepted for P80C32UBAA,518?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for P80C32UBAA,518 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for P80C32UBAA,518?
P80C32UBAA,518 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your P80C32UBAA,518 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 P80C32UBAA,518?
For technical support, including P80C32UBAA,518 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your P80C32UBAA,518 requirements.
6.How does Aetrix verify that P80C32UBAA,518 is sourced from the original manufacturer or authorized distributors?
All P80C32UBAA,518 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 P80C32UBAA,518 meets industry standards.
7.What is the process for return or replacement of P80C32UBAA,518?
All P80C32UBAA,518 units undergo pre-shipment inspection (PSI). If there is an issue with P80C32UBAA,518, 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 P80C32UBAA,518 part is unused and in its original packaging.
Return procedure for P80C32UBAA,518:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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