Microchip Technology 93LC86/P

Overview

93LC86/P from Microchip Technology Inc. is a 16K-bit (2048 × 8 or 1024 × 16) low-voltage serial EEPROM with Microwire interface, ORG-pin-selectable memory organization, and integrated power-on/off data protection. It operates down to 2.5V, draws 1 mA active current and 5 µA standby current (typical at 3.0V), and supports industrial temperature range (–40°C to +85°C). It is used in embedded systems for parameter storage, calibration data retention, and configuration backup.

For engineers reviewing the 93LC86/P datasheet, 93LC86/P pinout, 93LC86/P application, or 93LC86/P equivalent, key selection considerations include its 3-wire serial interface timing (max 3 MHz at VCC ≥ 4.5V), self-timed erase/write cycles (3 ms/word typical), 1,000,000 endurance cycles, >200-year data retention, and dual-package availability (PDIP/SOIC) with PE and ORG pin control for write-enable and x8/x16 configuration.

Technical Context

The 93LC86/P implements a synchronous 3-wire Microwire-compatible serial interface using CS, CLK, and DI/DO lines with start-bit detection and opcode-driven command execution. Its internal architecture includes an address decoder, data register, counter, and mode decode logic that supports READ, WRITE, ERASE, ERAL, WRAL, EWEN, and EWDS instructions - all synchronized to the rising edge of CLK.

Memory organization is dynamically selected via the ORG pin: tied to VCC enables 1024 × 16-bit mode; tied to VSS enables 2048 × 8-bit mode. The DO pin serves dual roles - serial data output during READ and Ready/Busy status indicator during programming - while the PE pin provides hardware-level write-protection when pulled low.

Key Specifications

Pinout & Package

93LC86/P is supplied in an 8-pin plastic DIP (300 mil body) package with through-hole mounting. Pin functions are electrically identical to the SOIC variant but differ mechanically in lead pitch and body dimensions.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar serial EEPROM applications.

Compared with 93LC86C/P, the 93LC86/P lacks updated AC timing specs and lifecycle support; compared with AT25080B-PU, it offers Microwire compatibility and simpler status polling but lower maximum clock rate and smaller density.

Availability

93LC86/P is available at Aetrix Electronics and suitable for industrial sensor calibration, consumer appliance configuration, and automotive body control modules requiring stable component supply and long-term obsolescence management.

Supply support for 93LC86/P 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

Microchip Technology Inc. is a U.S.-based semiconductor manufacturer specializing in microcontrollers, analog devices, and nonvolatile memory solutions for embedded applications.

The 93LCxx family was designed specifically for cost-sensitive, low-power serial EEPROM applications requiring simple 3-wire interface, hardware write protection, and reliable data retention in space-constrained designs.

FAQ

What is the memory organization flexibility of the 93LC86/P?

The 93LC86/P supports two memory configurations via the ORG pin: when tied to VSS, it operates as 2048 × 8-bit (2048 words × 8 bits); when tied to VCC, it operates as 1024 × 16-bit (1024 words × 16 bits). An internal pull-up ensures x16 mode if ORG is left unconnected. This allows alignment with host MCU data bus width without changing the 93LC86/P part number or footprint.

How does the Program Enable (PE) pin protect data in the 93LC86/P?

The PE pin on the 93LC86/P provides hardware-level write inhibition: tying PE to VSS disables all erase and write functions, including EWEN, ERASE, WRITE, ERAL, and WRAL. If PE is floated or tied to VCC, programming is enabled. An internal pull-up ensures default write-enable behavior, making the 93LC86/P safe for use in systems where accidental writes must be prevented during power transitions or noise events.

What timing parameters define the maximum operational speed of the 93LC86/P?

The 93LC86/P supports up to 3 MHz clock frequency when VCC is 4.5–6.0V, and up to 2 MHz when VCC is 2.5–4.5V. Critical timing constraints include minimum chip select low time (TCSL = 250 ns), clock high/low times (TCKH/TCKL = 200–300 ns / 100–200 ns), and data setup/hold (TDIS/TDIH = 50–100 ns). These values directly determine achievable serial throughput and must be met by the host controller's Microwire interface.

Does the 93LC86/P require external components for reliable operation?

No external components are required for basic 93LC86/P operation beyond standard decoupling: a 0.1 µF ceramic capacitor between VCC and VSS is recommended near the package. The device integrates internal charge pumps for EEPROM programming, power-on reset circuitry, and pull-up resistors on ORG and PE pins. However, proper PCB layout - including short traces for CS/CLK/DI/DO and ground plane integrity - is essential to meet timing and noise immunity specifications.

What is the significance of the "Not recommended for new designs" notice for the 93LC86/P?

The "Not recommended for new designs" notice on the 93LC86/P datasheet (DS21131F) indicates Microchip has superseded it with the 93LC86C series, which features updated electrical characterization, enhanced reliability testing, and continued long-term supply commitment. While the 93LC86/P remains functional and supported for existing designs, new projects should use 93LC86C/P to ensure access to future revisions, extended lifecycle, and full technical documentation coverage.