Microchip Technology AT28C010-12JU

Overview

AT28C010-12JU from Microchip Technology is a 1-Mbit (128K × 8) paged parallel EEPROM with 120 ns read access time, JEDEC-standard byte-wide pinout, and single 5V ±10% supply operation. It supports automatic 1–128-byte page writes with internal latching and timer control, and delivers 10,000 or 100,000 write cycles endurance for firmware storage in industrial microcontroller systems.

For engineers reviewing the AT28C010-12JU datasheet, AT28C010-12JU pinout, AT28C010-12JU application, or AT28C010-12JU equivalent, this device serves as a drop-in replacement for legacy parallel EEPROMs in boot code storage, configuration memory, and calibration data retention where fast random read and controlled page programming are required.

Technical Context

The AT28C010-12JU implements a CMOS-based nonvolatile memory architecture with dual-line chip enable (CE) and output enable (OE) control, enabling bus contention avoidance in shared-data-bus systems. Its internal 128-byte page register allows burst loading of up to 128 bytes before initiating autonomous internal programming.

Write completion detection is supported via DATA Polling on I/O7 (complement-to-data during write, true data after completion) and Toggle Bit behavior on I/O6, both usable without external timing constraints. Hardware write protection includes VCC sense (<3.8 V inhibits write), 5 ms power-on delay, and noise filtering on WE/CE inputs.

Key Specifications

Pinout & Package

AT28C010-12JU is packaged in a 32-lead Plastic Leaded Chip Carrier (PLCC) with matte tin finish, compliant with JEDEC MO-047AB. Pin 1 is designated by a corner chamfer and is a no-connect (NC) terminal.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AT28C010-12JU, the -15JU variant trades 30 ns of speed for broader timing margin and cost efficiency, while the AT28C256-15JU extends capacity within identical mechanical and electrical integration constraints-enabling memory upgrades without PCB redesign.

Availability

AT28C010-12JU is available at Aetrix Electronics and suitable for industrial control systems, embedded instrumentation, and legacy microcontroller boot memory requiring stable component supply, long-lifecycle support, and green (Pb/Halide-free) packaging compliance.

Supply support for AT28C010-12JU 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 is a global semiconductor company specializing in microcontrollers, analog devices, and nonvolatile memory solutions, with a focus on industrial, automotive, and aerospace reliability standards.

The AT28C010 belongs to Microchip's legacy parallel EEPROM product line, designed specifically for pin-compatible migration from EPROM and early Flash in systems requiring predictable timing, high write endurance, and robust data retention without battery backup.

FAQ

What is the maximum page write size supported by the AT28C010-12JU?

The AT28C010-12JU supports a maximum page write size of 128 bytes. This is enabled by its internal 128-byte page register, which latches address and data upon the first write strobe. Subsequent bytes must be loaded within 150 µs of the prior byte; exceeding this interval triggers immediate internal programming. The AT28C010-12JU uses A7–A16 to define the page boundary, ensuring all written bytes reside within the same 128-byte aligned block.

How does DATA Polling work on the AT28C010-12JU during a write cycle?

During a write cycle, reading the last written byte from the AT28C010-12JU causes I/O7 to output the complement of the written data. Once the internal programming completes, I/O7 returns true data-signaling readiness for the next operation. This mechanism allows host firmware to poll I/O7 without fixed delays or external timers. The AT28C010-12JU guarantees this behavior across its full operating temperature and voltage range, making it ideal for real-time embedded systems.

Is the AT28C010-12JU pin-compatible with standard SRAM devices?

Yes-the AT28C010-12JU features a JEDEC-approved byte-wide pinout identical to common 128K × 8 SRAMs (e.g., IS61LV12816), including matching A0–A16, I/O0–I/O7, CE, OE, WE, VCC, and GND placements. Pin 1 is NC on the AT28C010-12JU, aligning with many SRAM footprints. However, timing differences (e.g., write enable behavior, no write recovery delay) require verification in the target system's memory controller logic before direct substitution.

What endurance rating does the AT28C010-12JU carry, and how is it indicated?

The AT28C010-12JU is available in two endurance grades: 10,000 cycles (standard, unmarked) and 100,000 cycles (extended, marked with "E" in the package marking). The "E" appears in the top-side laser marking as "AT28C010E" on the PLCC body. Both versions share identical AC/DC specifications and packaging; the endurance difference reflects process-level oxide quality enhancements validated through accelerated life testing per JEDEC JESD22-A117.

Does the AT28C010-12JU require external high-voltage circuitry for programming?

No-the AT28C010-12JU performs all programming and erase operations using only its standard 5V ±10% supply. Internal charge pumps generate necessary high voltages for Fowler-Nordheim tunneling. The optional 12V chip erase mode is not required for normal operation and is reserved for factory-level bulk erasure. All byte and page writes, as well as software data protection enable/disable sequences, execute fully at 5V-simplifying system design and eliminating external HV generators.