Microchip Technology AT28C010-12TI

Overview

AT28C010-12TI from Atmel is a 1-Mbit (128K × 8) paged parallel EEPROM with JEDEC-standard byte-wide pinout, 120 ns read access time, 10 ms maximum page write cycle, and CMOS/TTL-compatible I/O. It operates on single 5V ±10% supply, supports hardware/software data protection, and targets industrial embedded systems requiring nonvolatile storage with reliable in-system reprogramming.

For engineers reviewing the AT28C010-12TI datasheet, AT28C010-12TI pinout, AT28C010-12TI application, or AT28C010-12TI equivalent, this device is selected for its fast page-write capability (1–128 bytes), DATA polling and toggle-bit write-completion detection, 10⁴/10⁵ endurance cycles, 10-year data retention, and industrial temperature range (–40°C to +85°C).

Technical Context

The AT28C010-12TI implements a paged architecture with a 128-byte internal page register, enabling simultaneous latching of address and up to 128 bytes of data before autonomous internal programming. Its dual-line chip enable (CE) and output enable (OE) control allows flexible bus contention management during read operations.

Write operation relies on internal timing-no external clock required-with hardware protection via VCC sense (<3.8 V inhibit), 5 ms power-on delay, noise filtering (<15 ns pulses rejected), and software data protection (SDP) enabled/disabled via three-byte command sequences at fixed addresses.

Key Specifications

Pinout & Package

AT28C010-12TI is packaged in a 32-lead Plastic J-leaded Chip Carrier (PLCC), JEDEC MS-016 AE compliant, with pin 1 marked and designated "Don't Connect" (DC). The package provides robust thermal performance and surface-mount compatibility for high-reliability PCB assemblies.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AT28C010-12TI, AT28C010-12PI offers identical functionality in a through-hole package ideal for lab use, while AT28C010E-12TI extends endurance tenfold for high-update-rate applications - both retain the same 120 ns access, 10 ms page write, and industrial temperature rating.

Availability

AT28C010-12TI is available at Aetrix Electronics and suitable for industrial automation, legacy system modernization, and medical device manufacturing requiring stable component supply, long-lifecycle support, and guaranteed industrial-temperature qualification.

Supply support for AT28C010-12TI 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

Atmel Corporation (now part of Microchip Technology) is a fabless semiconductor company specializing in microcontrollers, nonvolatile memory, and secure authentication ICs for industrial, automotive, and consumer applications.

The AT28C010 product line was designed as a drop-in paged EEPROM solution for 8-bit systems needing reliable, low-power, in-system reprogrammable memory with SRAM-like read timing and JEDEC-standard pin compatibility.

FAQ

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

The AT28C010-12TI supports page write operations of 1 to 128 bytes per internal programming cycle. All bytes written in a single page operation must reside within the same 128-byte page boundary defined by address bits A7–A16. This capability is implemented via an internal 128-byte latch and control timer, allowing the host to release the address and data bus immediately after latching - a key feature distinguishing AT28C010-12TI from byte-serial EEPROMs.

How does the AT28C010-12TI detect completion of a write cycle?

The AT28C010-12TI provides two independent, hardware-based methods: DATA polling (monitoring I/O7 for complement-to-data transition) and the toggle bit (observing I/O6 toggling state until it stabilizes). Both operate asynchronously and require no external clock or timer - the host can poll any address during write execution. These mechanisms are fully documented in the AT28C010-12TI datasheet sections on Device Operation and Data Polling Waveforms.

Does the AT28C010-12TI require a 12V programming voltage?

No - the AT28C010-12TI operates entirely from a single 5V ±10% supply for both read and write functions. A 12V ±0.5V voltage is required *only* for accessing the optional 128-byte device identification area (addresses 1FF80H–1FFFFH) by raising pin A9; standard memory array reads/writes use only 5V. This design eliminates need for charge pumps or external HV generators, simplifying AT28C010-12TI system integration.

What is the purpose of the "Don't Connect" (DC) pin on the AT28C010-12TI PLCC package?

In the AT28C010-12TI's 32-lead PLCC package, pin 1 is explicitly designated "Don't Connect" (DC) per Atmel's packaging documentation and JEDEC MS-016 AE standard. It must remain unconnected - soldering, tying to VCC/GND, or routing signals to this pin violates the device's electrical and reliability specifications and may cause undefined behavior or accelerated wear. This is a mechanical pin-1 index marker, not a functional terminal.

Can the AT28C010-12TI be used as a direct replacement for SRAM in existing designs?

Yes - the AT28C010-12TI features SRAM-compatible read timing (120 ns access, CE/OE-controlled outputs) and identical JEDEC byte-wide pinout, enabling drop-in replacement in many 8-bit systems. However, write operations require explicit WE/CE sequencing and write-completion detection (polling/toggle), unlike volatile SRAM. Designers must modify firmware to handle write latency and protect against inadvertent writes using AT28C010-12TI's hardware/software data protection features.