87C51/BQA

Overview

The P87C51/BQA is an 8-bit microcontroller from the Philips/NXP 80C51 family, manufactured by Rochester Electronics. It features a 4KB OTPROM program memory and 128 bytes of RAM. The device operates on a 2.7V to 5.5V supply voltage with speeds up to 33MHz. It includes 32 I/O lines, three 16-bit timers/counters, a UART, and nested interrupts in a 40-pin PLCC package.

Feature Summary

• Integrates a high-performance static 80C51 CPU core with CMOS technology for low power consumption.
• Supports both 6-clock and 12-clock machine cycle operations for flexible performance control.
• Includes on-chip oscillator, clock circuits, and a six-source nested interrupt structure.
• Provides full-duplex UART serial communication capabilities alongside standard I/O expansion.

Applications

• Industrial control systems requiring robust 8-bit processing
• Consumer electronics utilizing low-voltage operation
• Embedded applications needing UART-based serial communication

Procurement Notes

Verify the specific suffix BQA against official datasheets to confirm pinout and package variations. Ensure compatibility with existing 80C51 software architectures. Confirm voltage range requirements match the 2.7V to 5.5V specification. Check for any obsolescence notices from the manufacturer or distributor.

Selection Notes

Select this component for designs requiring 4KB of one-time programmable memory and 32 general-purpose I/O lines. It is suitable for cost-sensitive applications needing 80C51 compatibility. Consider the 40-pin PLCC package constraints during PCB layout. Evaluate power consumption needs against the specified low-power modes.

Part Context

This part belongs to the Philips/NXP 80C51 family of 8-bit microcontrollers. It utilizes high-density CMOS technology. The family supports various memory configurations including ROM, EPROM, and OTPROM variants. Rochester Electronics provides these legacy components as a source for continued production.

Replacement Considerations

Compatible substitutes include other 80C51 derivatives with similar memory sizes, such as the P87C51FA or Intel 80C51 variants. Verify pin compatibility and electrical specifications before substitution.