Microchip Technology AT28C16-15TI

Overview

AT28C16-15TI from Atmel is a 16 Kbit (2K × 8) parallel EEPROM with 5-V-only operation, 150 ns access time, and industrial temperature range (–40°C to +85°C). It supports SRAM-like byte writes with self-timed 1 ms write cycles, RDY/BUSY and DATA polling for write completion detection, and features 100,000 write endurance and 10-year data retention. It is used in PCMCIA attribute memory and embedded configuration storage.

For engineers reviewing the AT28C16-15TI datasheet, AT28C16-15TI pinout, AT28C16-15TI application, or AT28C16-15TI equivalent, key selection criteria include industrial-grade temperature support, TSOP-28 package compatibility, 150 ns read timing compliance with PCMCIA standards, and VCC-sense write protection for robust in-system reconfiguration.

Technical Context

The AT28C16-15TI implements a parallel EEPROM architecture with internal address/data latching, eliminating external control logic during byte writes. Its dual-line chip enable (CE) and output enable (OE) control enables bus contention avoidance in shared-memory systems, while the open-drain RDY/BUSY pin supports interrupt-driven write completion handling across multiple devices.

Write protection relies on three hardware mechanisms: VCC sense (inhibits write if VCC < 3.8 V), 5 ms power-on delay before write enable, and signal-level inhibition (WE high, CE high, or OE low). Chip Clear and Device Identification modes use 12 V applied to OE or A9 respectively, requiring dedicated voltage generation circuitry.

Key Specifications

Pinout & Package

AT28C16-15TI is housed in a 28-lead Plastic Thin Small Outline Package (TSOP), pin-compatible with industry-standard 28-pin parallel EEPROM footprints and PCMCIA socket interfaces.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ST M28C16-150K1 and Microchip 28C16-15/J, the AT28C16-15TI uniquely integrates RDY/BUSY signaling, A9-based Device ID, and industrial-grade reliability in a standard TSOP-28 package-making it optimal for space-constrained, field-upgradable PCMCIA and embedded systems.

Availability

AT28C16-15TI is available at Aetrix Electronics and suitable for PCMCIA attribute memory, embedded configuration storage, and industrial control module applications requiring stable component supply, long-term lifecycle support, and guaranteed industrial temperature performance.

Supply support for AT28C16-15TI 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 was a U.S.-based semiconductor company specializing in microcontrollers, nonvolatile memory, and wireless solutions, later acquired by Microchip Technology in 2016.

The AT28C16-15TI belongs to Atmel's parallel EEPROM product line, designed specifically for PCMCIA-compliant attribute memory and industrial-grade in-system configuration storage where SRAM-like simplicity and 5 V compatibility are essential.

FAQ

What is the operating temperature range of the AT28C16-15TI?

The AT28C16-15TI is rated for industrial operation from –40°C to +85°C. This range is explicitly specified in the Ordering Information table and validated across all DC and AC parameters, including standby current, access time, and write cycle timing. The AT28C16-15TI maintains full functionality and timing compliance within this range, making it suitable for deployment in harsh environments such as factory automation and outdoor telecom infrastructure.

Does the AT28C16-15TI require a 12 V supply for normal operation?

No, the AT28C16-15TI operates from a single 5 V ±10% supply for all read and write functions. A 12 V supply is required only for two special modes: Chip Clear (applied to OE) and Device Identification (applied to A9). These are infrequent, factory or service-level operations-not part of routine read/write sequences. The AT28C16-15TI includes internal VCC sensing to prevent writes if VCC drops below ~3.8 V, ensuring data integrity during power transitions.

How does write completion detection work on the AT28C16-15TI?

The AT28C16-15TI provides two independent methods: RDY/BUSY pin assertion and DATA polling on I/O7. During a write, RDY/BUSY is actively pulled low and released upon completion; it supports wired-OR interrupt sharing. Alternatively, reading the addressed location returns the complement of the written data on I/O7 until completion, then true data. Both methods are fully supported in the AT28C16-15TI and documented in its AC Write and Data Polling waveforms.

Is the AT28C16-15TI pin-compatible with other 28-pin parallel EEPROMs?

The AT28C16-15TI uses a standard 28-lead TSOP package with industry-common pinout (A0–A10, I/O0–I/O7, CE, OE, WE, RDY/BUSY, VCC, GND, NC), matching JEDEC MO-153. However, pin compatibility does not guarantee functional equivalence: competing parts may omit RDY/BUSY, require different VPP schemes, or lack Device ID capability. Always verify signal-level behavior and timing before substitution-AT28C16-15TI's RDY/BUSY and A9-based ID modes are not universally replicated.

What is the endurance and data retention specification for the AT28C16-15TI?

The AT28C16-15TI guarantees 100,000 write/erase cycles per memory location and minimum 10 years of data retention at +85°C. These figures are characterized and specified in the DC Characteristics table and Features section. Endurance applies to individual bytes; retention is measured under worst-case thermal stress and accounts for oxide degradation mechanisms inherent to EEPROM technology. The AT28C16-15TI meets these specs across its full industrial temperature range without derating.