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NXP Semiconductors P80C32SBAA,512
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- Part No.:
- P80C32SBAA,512
- Manufacturer:
- NXP Semiconductors
- Category:
- Microcontrollers
- Package:
- 44-LCC (J-Lead)
- Datasheet:
-
P80C32SBAA,512.pdf
- Description:
- IC MCU 8BIT ROMLESS 44PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:1,135
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Product details
Overview
P80C32SBAA,512 from Philips Semiconductors 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 static CMOS design enabling operation from 0 to 16 MHz at 2.7 V–5.5 V. It serves as a core controller in embedded instrumentation and industrial I/O modules requiring low-voltage, low-power execution with external program memory.
For engineers reviewing the P80C32SBAA,512 datasheet, P80C32SBAA,512 pinout, P80C32SBAA,512 application, or P80C32SBAA,512 equivalent, key selection criteria include its PLCC-44 package, 256-byte on-chip RAM, idle/power-down power management modes, and compatibility with standard 8051 toolchains and external EPROM-based boot architectures.
Technical Context
The P80C32SBAA,512 implements a static 80C51 CPU core with Boolean processor and dual data pointers, supporting full 64 KB external program and data memory addressing. Its internal timing relies on an on-chip oscillator with XTAL1/XTAL2 pins, and it supports zero-frequency stop-clock operation without data loss.
Power control includes software-selectable idle mode (CPU halted, peripherals active) and power-down mode (oscillator stopped, RAM retained down to 2.0 V), with wake-up via external interrupt (INT0/INT1) or hardware reset. The device uses Schmitt-trigger inputs on all I/O ports and provides TTL/CMOS-compatible logic levels.
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 control stacks and UART buffers without external SRAM |
| Max Clock Frequency | 16 MHz at VCC = 2.7–5.5 V - enables deterministic 1 µs instruction timing for time-critical I/O polling |
| I/O Ports | Four 8-bit bidirectional ports (P0–P3), each with internal pull-ups and Schmitt-trigger inputs - supports direct LED driving and noise-immune sensor interfacing |
| Timers/Counters | Three 16-bit timer/counters (T0, T1, T2) - T2 supports capture, auto-reload, and independent baud-rate generation for UART |
| Serial Interface | Full-duplex UART with framing error detection, automatic address recognition, and programmable clock-out on P1.0 - enables multi-drop RS-485 and debug console support |
| Power Modes | Idle mode (CPU halted, RAM/timers/UART active) and power-down mode (oscillator stopped, RAM retained) - reduces system standby current to µA range |
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 |
|---|---|---|
| 1 | NIC | No internal connection - must be left unconnected or tied to ground per layout guidelines |
| 2–9 | P1.0–P1.7 | Port 1 I/O with alternate functions: T2 (P1.0), T2EX (P1.1) - used for timer event capture or clock output |
| 10 | RST | Active-high reset input - requires ≥2 machine cycles (24 oscillator periods) high pulse for reliable reset |
| 11,13–19 | P3.0–P3.7 | Port 3 with secondary functions: RxD/TxD (P3.0/P3.1), INT0/INT1 (P3.2/P3.3), T0/T1 (P3.4/P3.5), WR/RD (P3.6/P3.7) |
| 20–21 | XTAL2/XTAL1 | Oscillator output/input - supports crystal (1–16 MHz) or external clock drive into XTAL1 |
| 22 | VSS | Ground reference - decoupling capacitor required within 1 cm of pin |
| 24–31 | P2.0–P2.7 | Port 2 - outputs high-order address byte (A8–A15) during external memory access |
| 32–33 | PSEN/ALE | PSEN: external program memory read strobe; ALE: address latch enable - both active during external fetches |
| 35 | EA/VPP | External Access Enable - must be low to execute code from external ROM starting at 0000H |
| 36–43 | P0.7–P0.0 | Port 0 - multiplexed AD7–AD0 address/data bus during external memory access; open-drain with strong pull-ups |
| 44 | VCC | Power supply - operates across 2.7 V–5.5 V; requires local 100 nF ceramic decoupling |
Key Features
| Feature | Design Value |
|---|---|
| Static CMOS design | Enables true zero-frequency operation and eliminates dynamic power consumption - critical for battery-backed or energy-harvesting systems |
| Programmable clock-out on P1.0 | Generates 61 Hz–4 MHz square wave (at 16 MHz OSC) for synchronizing external logic or ADC sampling clocks |
| Timer 2 with capture/reload/baud-rate modes | Allows simultaneous UART baud-rate generation and input capture for encoder or pulse-width measurement without CPU overhead |
| Four-level nested interrupt priority | Supports deterministic response to up to six interrupt sources (INT0, INT1, T0, T1, serial, T2) with configurable preemption |
| Low EMI ALE inhibit | AUXR.0 bit disables ALE pulses except during MOVX instructions - reduces radiated emissions in EMC-sensitive applications |
| Asynchronous port reset | Reset can be asserted independently of oscillator stability - simplifies power sequencing in multi-rail systems |
Applications
| Industrial PLC I/O Module | Embedded Data Logger |
|---|---|
Use Scenario: Standalone remote node collecting analog sensor readings and controlling relays via opto-isolated outputs. IC Role / Device Role / Timing Role: Main controller executing cyclic scan logic, managing UART telemetry, and servicing external interrupts from limit switches. Use Value: 256-byte RAM accommodates firmware + buffer space; power-down mode extends battery life between 15-minute logging intervals. | Use Scenario: Compact environmental monitor logging temperature/humidity to SPI flash using external address latches. IC Role / Device Role / Timing Role: Host MCU coordinating ADC conversions, timestamping via Timer 2, and formatting packets for RS-232 upload. Use Value: Dual data pointer enables efficient flash page writes; programmable clock-out drives ADC conversion trigger at precise intervals. |
| Legacy Equipment Controller | Medical Diagnostic Interface |
Use Scenario: Retrofit controller replacing obsolete 8031 in OEM test equipment with EPROM-based firmware and parallel printer interface. IC Role / Device Role / Timing Role: Drop-in 8051-compatible replacement executing existing assembly firmware, driving 8-bit data bus and control strobes. Use Value: Pin-compatible with 8031/8032 PLCC variants; identical instruction timing ensures no firmware rework needed. | Use Scenario: Isolated patient-side module acquiring ECG signals and transmitting processed frames over optically coupled UART. IC Role / Device Role / Timing Role: Safety-critical real-time processor handling analog front-end timing, digital filtering, and fail-safe watchdog supervision. Use Value: Idle mode maintains UART readiness while reducing thermal load; framing error detection prevents corrupted frame ingestion. |
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 | On-chip 4 KB Flash ROM; 128-byte RAM; max 24 MHz; PDIP-40 package | Eliminates need for external program memory but lacks T2 and dual DPTR | Select when firmware size ≤4 KB and board space allows PDIP; not suitable for legacy 8032-based designs requiring external ROM |
| DS89C430MCL+ | Single-cycle 8051 core; 1 KB RAM; 33 MHz; PLCC-44; integrated voltage regulator | Higher performance and integrated LDO simplify power design but require firmware recompilation | Choose for new designs needing faster throughput and reduced BOM count; incompatible with original 80C32 timing-critical code |
Compared with AT89C51-24PI and DS89C430MCL+, the P80C32SBAA,512 uniquely retains full external memory expansion capability, 256-byte RAM, and Timer 2 functionality in a drop-in PLCC-44 package - making it the only option for maintaining legacy 80C51-based systems with external EPROM and complex timing requirements.
Availability
P80C32SBAA,512 is available at Aetrix Electronics and suitable for industrial PLC I/O modules, embedded data loggers, legacy equipment controllers, and medical diagnostic interfaces requiring stable component supply and long-term obsolescence management.
Supply support for P80C32SBAA,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 80C31/80C32 product line was designed specifically for ROMless embedded control where external program memory is preferred - emphasizing pin compatibility, low-voltage operation, and robust power management for long-lifecycle industrial deployments.
FAQ
What is the maximum operating frequency of the P80C32SBAA,512?
The P80C32SBAA,512 is rated for a maximum operating frequency of 16 MHz across its full 2.7 V–5.5 V supply range. This is confirmed in the Philips ordering information table, where "S" in the part number denotes 16 MHz capability. Operation above 16 MHz is not supported and may result in timing violations or undefined behavior.
Does the P80C32SBAA,512 include on-chip program memory?
No, the P80C32SBAA,512 is a ROMless device - it contains no on-chip program memory. It executes code exclusively from external program memory (e.g., EPROM or Flash) accessed via P0/P2 buses and controlled by PSEN and EA/VPP signals. This distinguishes it from variants like the 80C51RA+ which integrate flash.
How much RAM does the P80C32SBAA,512 provide, and is it sufficient for typical 8051 applications?
The P80C32SBAA,512 integrates 256 × 8 bits (256 bytes) of on-chip RAM. This matches the 80C32 specification and is sufficient for most small-to-medium 8051 firmware implementations, including stack usage, register banks, and UART buffers - especially when combined with external RAM accessed via MOVX instructions.
What power-saving modes does the P80C32SBAA,512 support, and how do they differ?
The P80C32SBAA,512 supports two software-controlled low-power modes: idle mode (CPU halted, RAM/timers/UART remain active) and power-down mode (oscillator stopped, RAM retained down to 2.0 V). Wake-up from idle occurs via any enabled interrupt or reset; power-down wake-up requires external interrupt (INT0/INT1) or reset, with oscillator stabilization time <10 ms.
Is the P80C32SBAA,512 pin-compatible with other 80C51-family devices in PLCC-44 packages?
Yes, the P80C32SBAA,512 uses the standard 44-pin PLCC footprint (SOT187-2) and shares identical pin assignments with other Philips 80C31/80C32 variants in the same package - including P80C31SBAA and P80C32UBAA. This enables direct substitution in existing PLCC-44 layouts without PCB modification.
P80C32SBAA,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:
- 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:
P80C32SBAA,512 FAQ
1.How can I place an order for P80C32SBAA,512 through Aetrix?
Please submit a Request for Quotation (RFQ) for P80C32SBAA,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 P80C32SBAA,512 reliable?
The price and inventory of P80C32SBAA,512 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for P80C32SBAA,512 is usually 5 days.
3.What payment methods are accepted for P80C32SBAA,512?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for P80C32SBAA,512 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for P80C32SBAA,512?
P80C32SBAA,512 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your P80C32SBAA,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 P80C32SBAA,512?
For technical support, including P80C32SBAA,512 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your P80C32SBAA,512 requirements.
6.How does Aetrix verify that P80C32SBAA,512 is sourced from the original manufacturer or authorized distributors?
All P80C32SBAA,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 P80C32SBAA,512 meets industry standards.
7.What is the process for return or replacement of P80C32SBAA,512?
All P80C32SBAA,512 units undergo pre-shipment inspection (PSI). If there is an issue with P80C32SBAA,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 P80C32SBAA,512 part is unused and in its original packaging.
Return procedure for P80C32SBAA,512:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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