NXP Semiconductors P87C54SBAA,512

Overview

P87C54SBAA,512 from Philips Semiconductors is an OTP-based 8-bit microcontroller in the 80C51 family, featuring 16 KB on-chip program memory, 256 bytes of RAM, four 8-bit I/O ports, three 16-bit timers, and a full-duplex enhanced UART. It operates at up to 16 MHz across 2.7–5.5 V and targets embedded control applications requiring low-voltage operation and external memory expansion capability.

For engineers reviewing the P87C54SBAA,512 datasheet, P87C54SBAA,512 pinout, P87C54SBAA,512 application, or P87C54SBAA,512 equivalent, key selection criteria include OTP programmability, LCC-44 package compatibility, 16 KB ROM size, absence of PCA or WDT (distinguishing it from RA+/FA variants), and support for external 64 KB memory addressing via multiplexed AD0–AD7 and A8–A15 buses.

Technical Context

The P87C54SBAA,512 implements the standard 80C51 instruction set with full static CMOS operation, enabling clock stoppage without data loss. Its architecture supports external program/data memory access using Port 0 (AD0–AD7) and Port 2 (A8–A15), with ALE/PROG controlling address latching and PSEN enabling external code fetches.

It features a multi-source, four-priority-level nested interrupt structure with six interrupt sources (INT0, INT1, T0, T1, RxD, TxD), and power management modes including Idle and Power-down-both initiated via SFR writes to PCON. No hardware watchdog timer or programmable counter array (PCA) is integrated, confirming its classification within the base 8XC54/58 family rather than FA or RA+ derivatives.

Key Specifications

Pinout & Package

Package: Plastic Leaded Chip Carrier (PLCC), 44-pin, SOT187-2 footprint, with lead pitch 0.05 inch (1.27 mm) and body size 16.59 mm × 16.59 mm.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 8-bit microcontroller applications.

Compared with P87C54SBAA,512, the DIP-packaged P87C54SBPN,512 offers identical functionality in a through-hole format ideal for development, while P87C58SBAA,512 doubles program memory to 32 KB without altering I/O count, timing behavior, or power profile-making it a seamless upgrade path for memory-constrained designs.

Availability

P87C54SBAA,512 is available at Aetrix Electronics and suitable for industrial automation, automotive body electronics, medical device subsystems, and point-of-sale terminal designs requiring stable component supply and long-term manufacturability.

Supply support for P87C54SBAA,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 Dutch semiconductor company known for pioneering mixed-signal ICs and embedded controllers, with leadership in automotive, industrial, and consumer electronics.

The 8XC54/58 product line was designed as a cost-optimized, OTP-based evolution of the 80C51 for high-volume embedded control applications where firmware stability and low system cost outweigh flash reprogrammability.

FAQ

What is the maximum operating frequency of the P87C54SBAA,512?

The P87C54SBAA,512 supports a maximum clock frequency of 16 MHz, corresponding to a machine cycle time of 750 ns. This rating applies across its full 2.7–5.5 V supply range and 0°C to +70°C ambient temperature specification. Operation beyond 16 MHz is not guaranteed and may result in undefined instruction execution or timing violations.

Does the P87C54SBAA,512 include a hardware watchdog timer?

No, the P87C54SBAA,512 does not integrate a hardware watchdog timer. Watchdog functionality is present only in later derivatives such as the 8XC51RA+/RB+ series. For P87C54SBAA,512-based systems requiring reset supervision, an external watchdog IC (e.g., MAX823 or IMP809) must be used, triggered by software-timed outputs from Port 1 or Timer 2 overflow.

Can the P87C54SBAA,512 execute code from external memory?

Yes, the P87C54SBAA,512 can execute code from external memory when the EA/VPP pin is held low. In this configuration, the device fetches instructions from external program memory starting at address 0000H, using P0 (AD0–AD7) and P2 (A8–A15) for address/data multiplexing and PSEN as the read strobe. Internal 16 KB OTP remains unused in this mode.

What package type is used for the P87C54SBAA,512?

The P87C54SBAA,512 uses a 44-pin Plastic Leaded Chip Carrier (PLCC) package, designated SOT187-2. It features a square body with J-leads, 1.27 mm pitch, and is RoHS-compliant. This surface-mount package provides better thermal dissipation and higher I/O density than the DIP variant (P87C54SBPN,512), making it suitable for compact industrial PCBs.

Is the P87C54SBAA,512 pin-compatible with other 8XC54/58 variants?

Yes, the P87C54SBAA,512 is fully pin-compatible with all other 8XC54/58 family members in the same PLCC-44 package (e.g., P87C58SBAA,512, P80C54SBAA), sharing identical pin functions, electrical characteristics, and timing behavior. Firmware written for one variant will run unmodified on another, provided memory size and feature requirements align.