Microchip Technology AT28BV64-30JC

Overview

AT28BV64-30JC from Atmel is a 64K (8K × 8) parallel EEPROM operating at 2.7V–3.6V, featuring 300 ns read access time, 3 ms byte write cycle, and JEDEC-standard byte-wide pinout. It supports direct microprocessor control via DATA polling and open-drain RDY/BUSY output, and is designed for battery-powered embedded systems requiring nonvolatile storage with low active (8 mA) and standby (50 µA) current.

For engineers reviewing the AT28BV64-30JC datasheet, AT28BV64-30JC pinout, AT28BV64-30JC application, or AT28BV64-30JC equivalent, key selection criteria include its 300 ns read timing, 2.7–3.6 V single-supply operation, CMOS standby current under 50 µA, JEDEC-compliant 32-pin PLCC package, and support for both commercial (0°C to 70°C) and industrial (−40°C to 85°C) temperature ranges.

Technical Context

The AT28BV64-30JC implements a static RAM-compatible interface for reads and writes without external timing logic. Its internal self-timed write cycle uses an on-chip control timer to clear and program latched data after WE or CE activation, eliminating external wait-state generation.

Two hardware-based write completion detection methods are supported: level-sensitive RDY/BUSY (open-drain, active-low) and DATA polling (I/O7 toggles to complement during write, returns to true data at completion). Write protection includes VCC sense (<1.8 V inhibits write), 10 ms power-on delay, and input-level inhibition (OE low, CE high, or WE high).

Key Specifications

Pinout & Package

AT28BV64-30JC is packaged in a 32-lead Plastic J-Leaded Chip Carrier (PLCC), compliant with JEDEC MS-016 AE standard, with 1.27 mm pitch and body size 11.9 mm × 11.9 mm × 3.56 mm.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AT28C64B-15PU and ST M28W640ECT, the AT28BV64-30JC uniquely balances 3.3 V compatibility, JEDEC pinout, integrated RDY/BUSY signaling, and ultra-low standby current-making it optimal for cost-sensitive, battery-aware industrial upgrades where PCB reuse and power budget are critical.

Availability

AT28BV64-30JC is available at Aetrix Electronics and suitable for industrial PLC configuration storage, medical device calibration data logging, and automotive body control module NVM requiring stable component supply across extended temperature ranges and long product lifecycles.

Supply support for AT28BV64-30JC 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 embedded systems.

The AT28BV64 product line was designed specifically for low-voltage, battery-powered applications requiring reliable, byte-erasable nonvolatile memory with minimal external support circuitry and direct microprocessor interfacing.

FAQ

What is the operating voltage range of the AT28BV64-30JC?

The AT28BV64-30JC operates over a supply voltage range of 2.7 V to 3.6 V. This single-supply range enables direct integration into 3.3 V systems and battery-powered applications such as portable medical devices and industrial sensors. Operation outside this range may result in undefined behavior or failure to meet timing specifications, and the internal VCC-sense circuit disables writes below approximately 1.8 V to prevent data corruption.

Does the AT28BV64-30JC support both hardware and software methods for detecting write completion?

Yes, the AT28BV64-30JC provides two independent write completion detection mechanisms: hardware-based RDY/BUSY (an open-drain active-low output) and software-based DATA polling (monitoring I/O7 for complement-to-true transition). Both methods are fully functional and can be used interchangeably depending on system architecture-RDY/BUSY reduces CPU overhead, while DATA polling avoids additional GPIO usage. The AT28BV64-30JC datasheet specifies tDB ≤ 50 ns for RDY/BUSY assertion and guarantees deterministic polling behavior.

What package type is used for the AT28BV64-30JC, and is it lead-free?

The AT28BV64-30JC is supplied in a 32-lead Plastic J-Leaded Chip Carrier (PLCC) package, per JEDEC MS-016 AE standard. Per Atmel's 1998 documentation and Microchip's legacy compliance records, this variant uses SnPb (tin-lead) solder finish and is not RoHS-compliant. For lead-free alternatives, consult Microchip's current AT28BV64B family or equivalent replacements with "-10" or "-G" suffixes, as the AT28BV64-30JC itself does not meet modern Pb-free requirements.

How many write/erase cycles is the AT28BV64-30JC rated for, and what ensures its endurance?

The AT28BV64-30JC is rated for 100,000 write/erase cycles. Its endurance is enhanced by internal error correction circuitry that compensates for oxide degradation during repeated programming, extending usable life beyond standard EEPROM process limits. This feature, combined with precise charge-pump control and verify algorithms, ensures consistent performance across the full industrial temperature range (−40°C to +85°C) and contributes to the device's 10-year data retention guarantee.

Can the AT28BV64-30JC be used as a direct replacement for standard SRAM in existing designs?

The AT28BV64-30JC shares JEDEC-standard byte-wide pinout and SRAM-like read timing (300 ns), allowing it to occupy the same socket as many 8K × 8 SRAMs-but it is not a drop-in SRAM replacement due to fundamental differences in write behavior. Unlike SRAM, the AT28BV64-30JC requires explicit write enable sequencing, has a 3 ms self-timed write cycle, and needs RDY/BUSY or DATA polling to avoid bus contention. Therefore, while PCB footprint and read interface are compatible, firmware and timing logic must be adapted to accommodate nonvolatile write semantics. The AT28BV64-30JC is intended for persistent storage-not volatile working memory.