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NXP Semiconductors P80C32UBAA,512
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- Part No.:
- P80C32UBAA,512
- Manufacturer:
- NXP Semiconductors
- Category:
- Microcontrollers
- Package:
- 44-LCC (J-Lead)
- Datasheet:
-
P80C32UBAA,512.pdf
- Description:
- IC MCU 8BIT ROMLESS 44PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:4,565
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Product details
Overview
P80C32UBAA,512 from Philips Semiconductors is a ROMless 8-bit 80C51-compatible microcontroller with 256 × 8 RAM, operating at up to 33 MHz across 2.7 V–5.5 V supply, featuring three 16-bit timers, full-duplex UART, and dual power-saving modes (idle and power-down). It serves as a core controller in legacy industrial control, instrumentation, and embedded communication modules requiring low-voltage static operation and external memory expansion.
For engineers reviewing the P80C32UBAA,512 datasheet, P80C32UBAA,512 pinout, P80C32UBAA,512 application, or P80C32UBAA,512 equivalent, key selection criteria include its 33 MHz high-speed capability in PLCC-44 package, 256-byte on-chip RAM, static zero-frequency operation, and compatibility with standard 8051 toolchains and external program memory interfaces.
Technical Context
The P80C32UBAA,512 implements a static CMOS 80C51 CPU core with full Boolean processing, dual data pointers, and four-level nested interrupt priority supporting six interrupt sources. Its architecture enables external 64 KB program and 64 KB data memory addressing via multiplexed Port 0 (AD0–AD7) and Port 2 (A8–A15), with ALE-controlled address latching.
It integrates a programmable clock-out function on P1.0 (T2), Timer 2 with capture/auto-reload/baud-rate generator modes, and enhanced UART with framing error detection and automatic address recognition - all functional under 0–33 MHz operation with no minimum frequency requirement due to static design.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| CPU Core | 80C51-compatible 8-bit static core with Boolean processor and 12-clock-per-instruction cycle |
| RAM Size | 256 × 8 bytes on-chip RAM - sufficient for small real-time firmware without external SRAM |
| Max Clock Frequency | 33 MHz at VCC = 5 V - enables high-throughput serial and timer-driven tasks |
| Supply Voltage | 2.7 V to 5.5 V - supports battery-backed and mixed-voltage industrial systems |
| Power Modes | Idle mode (CPU halted, peripherals active) and power-down mode (oscillator stopped, RAM retained down to 2.0 V) |
| Timers/Counters | Three 16-bit timers: T0/T1 standard, T2 with capture, auto-reload, and baud-rate generation capability |
| Serial Interface | Full-duplex UART with framing error detection, automatic address recognition, and independent TX/RX clock sourcing (T1 or T2) |
Pinout & Package
Package: Plastic Leaded Chip Carrier (PLCC), 44-pin, SOT187-2 footprint, lead-free compatible per Philips specification.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| P0.0–P0.7 | Multiplexed AD0–AD7 | Open-drain bidirectional bus for lower 8 bits of address/data during external memory access; requires external pull-ups |
| P1.0/T2 | Port 1 bit 0 / Timer 2 input/output | General I/O or Timer 2 external count input/clock-out signal (50% duty cycle, up to 4 MHz at 16 MHz OSC) |
| P2.0–P2.7 | A8–A15 | Upper address byte output during 16-bit external memory accesses; retains P2 register value during 8-bit MOVX @Ri |
| P3.0/RxD, P3.1/TxD | UART RX/TX | Full-duplex serial interface pins with Schmitt-trigger inputs and internal pull-ups |
| XTAL1/XTAL2 | Oscillator interface | Connects to crystal (1–33 MHz) or external clock source; XTAL2 is buffered output |
| EA/VPP | External Access Enable | Must be held low to execute code from external program memory (0000H–0FFFH); not used in ROMless boot |
| ALE | Address Latch Enable | 1/6 OSC frequency strobe for latching P0 address; disabled when AUXR.0 = 1 (active only during MOVX) |
| RST | Reset input | Active-high reset requiring ≥2 machine cycles (24 oscillator periods); internal weak pull-down permits RC-based POR |
Key Features
| Feature | Design Value |
|---|---|
| Static CMOS design | Enables zero-frequency operation and deterministic stop/resume execution without data loss |
| Programmable clock-out on P1.0 | Generates precise 50% duty-cycle clock (61 Hz–4 MHz at 16 MHz OSC) for synchronous peripherals |
| Timer 2 flexibility | Supports capture, auto-reload (up/down), and independent baud-rate generation - eliminates need for external timing ICs |
| Low EMI ALE inhibit | AUXR.0 disables ALE except during MOVX, reducing radiated noise in sensitive analog environments |
| Asynchronous port reset | Allows reset assertion without waiting for oscillator stabilization - critical for fast-recovery safety-critical systems |
Applications
| Industrial PLC I/O Module | Legacy Serial Communication Gateway |
|---|---|
Use Scenario: Standalone I/O expansion node in distributed control system, polling sensors/actuators via RS-485 and managing local logic. IC Role / Device Role / Timing Role: Main controller executing ladder logic interpreter; uses Timer 2 for precise 10 ms task scheduling and UART for Modbus RTU. Use Value: 256-byte RAM accommodates runtime variables and stack; 33 MHz ensures sub-millisecond response to hardware interrupts from field inputs. | Use Scenario: Protocol translator bridging RS-232 host to RS-485 fieldbus, handling address filtering and data buffering. IC Role / Device Role / Timing Role: UART-centric bridge controller; leverages automatic address recognition and framing error detection to reduce host CPU load. Use Value: Dual baud-rate capability (T1 for RX, T2 for TX) enables asymmetric speed negotiation; PLCC-44 allows robust socketed replacement in field-deployed units. |
| Embedded Instrumentation Front-End | Low-Power Data Logger |
Use Scenario: Signal conditioning and display driver in portable multimeter, sampling ADC and updating LCD via 4-bit interface. IC Role / Device Role / Timing Role: Real-time coordinator managing ADC conversion triggers, LCD refresh, and button scan using Timer 0 and Port 1 interrupts. Use Value: Static design permits clock gating between measurements; 2.7 V minimum VCC extends battery life in AA-powered devices. | Use Scenario: Battery-operated environmental sensor node recording temperature/humidity every 5 minutes and transmitting via UART to base station. IC Role / Device Role / Timing Role: Power-aware supervisor entering power-down mode between samples; awakened by Timer 2 overflow interrupt. Use Value: RAM retention down to 2.0 V preserves logging state during brownout; external interrupt wakeup (INT0/INT1) enables immediate response to alarm 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 |
|---|---|---|---|
| AT89C51-24PI | 4 KB on-chip Flash ROM, 128-byte RAM, max 24 MHz, PDIP-40 package | Self-contained program storage eliminates external EPROM; lower max frequency and RAM limit complex protocol stacks | Select when firmware size ≤4 KB and board layout favors DIP over PLCC |
| DS80C320-QCL+ | Enhanced 8051 core, 256-byte RAM, 33 MHz, PLCC-44, integrated power-fail reset and watchdog | Higher instruction throughput (1–2 clocks/instruction), but requires updated toolchain and lacks ONCE debug mode | Select for new designs needing higher performance and reliability features; not drop-in compatible due to SFR differences |
Compared with AT89C51-24PI and DS80C320-QCL+, the P80C32UBAA,512 offers proven ROMless flexibility for field-upgradable systems with external memory, maintains full 8051 instruction and SFR compatibility, and delivers identical PLCC-44 footprint and 33 MHz timing - making it optimal for maintaining legacy industrial hardware while retaining upgrade path control.
Availability
P80C32UBAA,512 is available at Aetrix Electronics and suitable for industrial PLC I/O modules, legacy serial communication gateways, and embedded instrumentation front-ends requiring stable component supply and long-term obsolescence management.
Supply support for P80C32UBAA,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 pioneer in 8-bit microcontroller innovation, delivering high-reliability, industry-standard silicon for industrial and automotive applications since the 1980s.
The 80C32 product line was designed specifically for ROMless embedded control where external program memory, deterministic real-time response, and wide voltage/temperature operation were essential - targeting factory automation, test equipment, and telecom infrastructure.
FAQ
What is the maximum operating frequency of the P80C32UBAA,512 and under what conditions?
The P80C32UBAA,512 supports a maximum operating frequency of 33 MHz at VCC = 5.0 V. This rating is validated for the PLCC-44 package (SOT187-2) across the 0°C to +70°C temperature range. Operation at 33 MHz requires stable 5 V supply and proper decoupling; at 2.7 V, the maximum rated frequency is 16 MHz per Philips specification.
Does the P80C32UBAA,512 include on-chip program memory?
No, the P80C32UBAA,512 is a ROMless device with zero bytes of on-chip program memory. It executes code exclusively from external program memory (EPROM or Flash) accessed via P0 and P2 address/data buses. The "32" in the part number explicitly denotes the 80C32 variant, which provides 256 × 8 RAM but no internal ROM - unlike the 80C51 or 80C52 families.
How does the power-down mode function on the P80C32UBAA,512 and how is it exited?
In power-down mode, the P80C32UBAA,512 stops the oscillator and disables all peripherals except RAM and SFRs, retaining data down to 2.0 V. It exits via hardware reset or enabled external interrupt (INT0/INT1, level-sensitive). Upon reset, SFRs reset to default values; upon interrupt, both RAM and SFRs retain state. The WUPD bit in AUXR1 controls interrupt wakeup enablement.
What package type and pin count does the P80C32UBAA,512 use?
The P80C32UBAA,512 uses a 44-pin Plastic Leaded Chip Carrier (PLCC) package conforming to drawing SOT187-2. Pin 1 is located at the index corner adjacent to the notch; the package is leaded, surface-mount compatible, and specified for 0°C to +70°C ambient operation.
Can the P80C32UBAA,512 generate two independent baud rates for UART transmit and receive?
Yes, the P80C32UBAA,512 supports independent UART transmit and receive baud rates using Timer 2 (T2) and Timer 1 (T1). Setting RCLK = 1 configures Timer 2 for receive clocking, while TCLK = 1 assigns Timer 2 to transmit clocking - enabling asymmetric rates such as 9600 bps RX / 115200 bps TX, critical for protocol translation applications.
P80C32UBAA,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:
- 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:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
P80C32UBAA,512 FAQ
1.How can I place an order for P80C32UBAA,512 through Aetrix?
Please submit a Request for Quotation (RFQ) for P80C32UBAA,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 P80C32UBAA,512 reliable?
The price and inventory of P80C32UBAA,512 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for P80C32UBAA,512 is usually 5 days.
3.What payment methods are accepted for P80C32UBAA,512?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for P80C32UBAA,512 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for P80C32UBAA,512?
P80C32UBAA,512 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your P80C32UBAA,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 P80C32UBAA,512?
For technical support, including P80C32UBAA,512 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your P80C32UBAA,512 requirements.
6.How does Aetrix verify that P80C32UBAA,512 is sourced from the original manufacturer or authorized distributors?
All P80C32UBAA,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 P80C32UBAA,512 meets industry standards.
7.What is the process for return or replacement of P80C32UBAA,512?
All P80C32UBAA,512 units undergo pre-shipment inspection (PSI). If there is an issue with P80C32UBAA,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 P80C32UBAA,512 part is unused and in its original packaging.
Return procedure for P80C32UBAA,512:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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