Microchip Technology AT28C010-12PI

Overview

AT28C010-12PI 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 single 5V ±10% supply operation. It supports hardware/software data protection, DATA polling, and toggle-bit write completion detection for embedded firmware storage in industrial control systems.

For engineers reviewing the AT28C010-12PI datasheet, AT28C010-12PI pinout, AT28C010-12PI application, or AT28C010-12PI equivalent, key selection criteria include industrial temperature range (-40°C to +85°C), 128-byte page write capability, CMOS/TTL compatibility, VCC sense write inhibit, and 10⁴/10⁵ endurance cycles.

Technical Context

The AT28C010-12PI implements a paged architecture with internal 128-byte latches and an autonomous control timer for self-timed writes. Its dual-line chip enable (CE) and output enable (OE) logic enables bus contention avoidance during mixed read/write operations in SRAM-like interfacing.

It integrates hardware-level VCC sensing (write inhibited below 3.8 V), 5 ms power-on delay, noise filtering (<15 ns pulse rejection), and software data protection via three-byte command sequences at fixed addresses (5555H/2AAAH/5555H). Device identification space (1FF80H–1FFFFH) requires A9 = 12 V ±0.5 V.

Key Specifications

Pinout & Package

AT28C010-12PI is supplied in a 32-lead plastic dual inline package (PDIP), 0.600" wide (32P6), with JEDEC-standard byte-wide pinout. Pin 1 is A16; pins 17–24 are I/O0–I/O7; pin 16 is GND; pin 32 is VCC.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AT28C010-12PI, AT28C010-12JI offers identical functionality in a surface-mount package for space-constrained designs, while AT28C010E-12PI extends endurance to 100,000 cycles for high-frequency update scenarios - both retain full pin and software compatibility.

Availability

AT28C010-12PI is available at Aetrix Electronics and suitable for industrial automation, medical instrumentation, and automotive body electronics requiring stable component supply across extended product lifecycles.

Supply support for AT28C010-12PI 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 semiconductor manufacturer specializing in microcontrollers, nonvolatile memory, and secure authentication ICs.

The AT28C010 product line delivers high-reliability paged parallel EEPROMs designed for firmware storage, configuration retention, and calibration data logging in industrial and automotive systems with demanding environmental and longevity requirements.

FAQ

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

The AT28C010-12PI supports up to 128 bytes per page write operation. This is enabled by its internal 128-byte page register, which latches address and data simultaneously. All bytes written in a single page cycle must reside on the same page, defined by A7–A16 inputs. The AT28C010-12PI does not support partial-page writes smaller than 1 byte or larger than 128 bytes - each write must be 1 to 128 bytes within the same page boundary.

How does hardware data protection work in the AT28C010-12PI?

Hardware data protection in the AT28C010-12PI includes four mechanisms: (1) VCC sense - write function disabled if supply drops below 3.8 V; (2) 5 ms power-on delay - internal timer prevents writes until VCC stabilizes; (3) write inhibit - any of OE high, CE low, or WE high blocks write initiation; (4) noise filtering - pulses <15 ns on WE or CE are ignored. These features operate independently of firmware and ensure AT28C010-12PI remains immune to spurious writes during power transitions or EMI events.

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

Yes, the AT28C010-12PI can replace SRAM in read operations due to its SRAM-like access protocol: CE and OE low with WE high asserts data on I/O lines within 120 ns. However, write cycles differ - AT28C010-12PI requires controlled WE/CE timing and write completion detection (DATA polling or toggle bit), unlike SRAM's instantaneous write. No pinout or voltage changes are needed, but firmware must implement AT28C010-12PI's write-handling sequence.

What is the purpose of the 128-byte device identification area in the AT28C010-12PI?

The AT28C010-12PI includes a dedicated 128-byte EEPROM region at addresses 1FF80H–1FFFFH for device identification and tracking. Access requires raising A9 to 12 V ±0.5 V. This area is electrically isolated from the main memory array, enabling permanent serialization, calibration metadata storage, and manufacturing traceability without consuming user memory space or affecting main-array endurance. It is fully readable/writable using standard AT28C010-12PI timing protocols once A9 voltage is applied.

Does the AT28C010-12PI support chip erase functionality?

Yes, the AT28C010-12PI supports optional software chip erase using a 6-byte command sequence detailed in Atmel's Software Chip Erase application note. This erases the entire 128K × 8 memory array to FFH. The command must be issued under valid 5 V supply conditions and conforms to AC timing specifications. Chip erase is distinct from page or byte writes and is not enabled by default - it requires explicit host execution of the documented sequence. The AT28C010-12PI does not support hardware reset-based or VPP-assisted chip erase.