Microchip Technology AT28C64E-15TC

Overview

AT28C64E-15TC from Atmel is a 64 Kbit (8K × 8) parallel EEPROM with JEDEC-standard byte-wide pinout, 150 ns read access time, 200 µs fast byte write cycle, and CMOS/TTL-compatible I/O. It operates at 5V ±10%, supports commercial temperature range (0°C to 70°C), and delivers 30 mA active current and 100 µA standby current for embedded microcontroller systems requiring nonvolatile configuration storage.

For engineers reviewing the AT28C64E-15TC datasheet, AT28C64E-15TC pinout, AT28C64E-15TC application, or AT28C64E-15TC equivalent, key selection considerations include self-timed write with RDY/BUSY or DATA polling, high endurance (10⁵ cycles), chip erase capability, VCC-sense write protection, and TSOP-28 packaging for space-constrained PCB layouts.

Technical Context

The AT28C64E-15TC implements a parallel EEPROM architecture with internal address/data latching and an autonomous control timer that manages clear-before-write sequencing without external timing components. Its dual write detection-RDY/BUSY open-drain output and I/O7 data polling-enables flexible host interface integration in microprocessor-based systems.

It features VCC sense (write inhibited below 3.8 V), 5 ms power-on delay before write enable, and three-level write inhibit logic (OE high, CE high, or WE high). The device includes 32 bytes of dedicated identification memory accessible via A9 = 12 V and addresses 1FE0H–1FFFH.

Key Specifications

Pinout & Package

AT28C64E-15TC is housed in a 28-lead Plastic Thin Small Outline Package (TSOP), JEDEC MS-012 compliant, with 0.5 mm lead pitch and body dimensions 11.8 × 7.6 mm. Pin 1 is RDY/BUSY (open-drain), pins 15–22 are I/O0–I/O7, and pin 28 is VCC.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AT28C64B-15TC, the AT28C64E-15TC offers 10× higher endurance and 5× faster writes-critical for field-updatable systems-while FM24C64-G trades parallel simplicity for serial pin count reduction but sacrifices deterministic write timing and bus compatibility.

Availability

AT28C64E-15TC is available at Aetrix Electronics and suitable for industrial PLCs, medical calibration systems, and point-of-sale terminals requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant TSOP packaging.

Supply support for AT28C64E-15TC 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 for industrial, automotive, and consumer applications.

The AT28C64 family was designed as a drop-in parallel EEPROM replacement for UV-erasable EPROMs and battery-backed SRAM in 8-bit embedded systems, emphasizing ease of integration, write reliability, and long-term data retention.

FAQ

What is the maximum write endurance specification for the AT28C64E-15TC?

The AT28C64E-15TC guarantees 100,000 write/erase cycles per memory location, verified per JEDEC standard JESD22-A117. This endurance rating applies across the full commercial temperature range (0°C to 70°C) and is enabled by the "E" variant's enhanced oxide process. Each AT28C64E-15TC device undergoes accelerated life testing to ensure compliance before shipment.

Does the AT28C64E-15TC require external high-voltage circuitry for programming?

No, the AT28C64E-15TC performs all write and erase operations using only a standard 5 V supply-no external 12 V programming voltage is needed for normal byte writes. High voltage (12 V ±0.5 V) is required only for the optional CHIP CLEAR function (applied to OE) and device identification memory access (applied to A9), both of which are infrequent operations.

How does the RDY/BUSY pin on the AT28C64E-15TC behave during a write cycle?

During a write cycle, the RDY/BUSY pin (Pin 1) on the AT28C64E-15TC is actively pulled low as an open-drain output. It remains low for the full duration of the self-timed write (200 µs), then releases to high-impedance at completion. An external pull-up resistor is required; multiple AT28C64E-15TC devices can share a single RDY/BUSY line via wired-OR connection.

Can the AT28C64E-15TC be used as a direct replacement for the AT28C64-15TC in existing designs?

Yes-the AT28C64E-15TC is pin-, package-, and timing-compatible with the AT28C64-15TC, differing only in endurance (10⁵ vs. 10⁴ cycles) and write speed (200 µs vs. 1 ms). All DC/AC specifications, pin functions, and interface protocols remain identical, allowing seamless upgrade without PCB or firmware changes.

What is the purpose of the 32-byte identification memory in the AT28C64E-15TC?

The 32-byte identification memory (addresses 1FE0H–1FFFH) in the AT28C64E-15TC is user-programmable for device serialization, firmware version tagging, or manufacturing traceability. Access requires raising A9 to 12 V ±0.5 V while performing standard read/write cycles-no special command sequences are needed, and the block operates identically to main memory.